2 Check Bandwidth

Connect the leveled sine-wave generator output via a 50-S2 cable and a 50-ii termination to the CH 1 OR X input connector. c. Set the generator output amplitude for a 5-division, 50-kHz display. b. Connect a 10-MHz, leveled sine-wave signal via a 50-i2 cable, a 50-i2 termination, and a dual-input coupler to the CH 1 OR X and the CH 2 OR Y input connectors. c. Set the generator output amplitude to produce a 6-division display. d. Vertically center the display using the Channel 2 POSITION...

2 Check External Triggering

Connect the test setup as shown in Figure 4-1. g. CHECK Stable display can be obtained by adjusting the TRIGGER LEVEL control for each switch combination given in Table 4-6. h. Remove the 10X attenuator from the test setup and set the EXT COUPLING switch to DC-MO. Figure 4-1. Test setup for external trigger and jitter checks. VERTICAL MODE SEC DIV X10 Magnifier TRIGGER SOURCE k. Reconnect the test setup as shown in Figure 4-1. I. Set the leveled sine-wave generator to produce a 5-division,...

2 Check High Voltage Supply

Set the POWER switch to OFF (button out). b. Set the dc voltmeter to a range of at least -2500 V dc and connect the volts lead to chassis ground. Remove the crt base-socket cover and connect the common lead of the dc voltmeter to pin 2 on the socket. c. Set the POWER switch to ON (button in). d. CHECK High Voltage Supply dc level is -1900 V to -2100 V. e. Set the POWER switch to OFF (button out). h. ADJUST The -8.6 V Adj (R946) for -8.6 V. i. Re-install the High-Voltage shield (see the...

4 Adjust Astigmatism and Auto Focus R887 and R875

Channel 1 AC-GND-DC A SEC DIV A TRIGGER MODE b. Connect a leveled sine-wave generator via a 50 Q cable and a 50 fi termination to the CH 1 OR X input connector. c. Adjust the generator output for a 4-division, 50 kHz display. d. ADJUST Both the Astig adjustment (R887) and the AUTO FOCUS control for the best focused display over the range of the AUTO INTENSITY control. e. Set the A SEC DIV switch to 5 ts. f. ADJUST Auto Focus Adj (R875) for the best focused display. Do not change the front panel...

5 Check Position Control Range

Align the 3rd time marker with the center vertical graticule line. c. Set the X10 Magnifier knob to on (knob out). d. CHECK Magnified time marker can be positioned to the left of the center vertical graticule line by rotating the Horizontal POSITION control fully counterclockwise. e. CHECK Start of the sweep can be positioned to the right of the center vertical graticule line by rotating the Horizontal POSITION control fully clockwise.

Adjustment Interaction

The use of Table 5-1 is particularly important if a partial procedure is performed or if a circuit requires readjustment due to a component replacement. To use this table, first find the adjustment that was made (extreme left column). Then move to the right, across the row, until you come to a darkened square. From the darkened square, move up the table to find the affected adjustment at the heading of that column. Check the accuracy of this adjustment and, if necessary, perform readjustment....

Attenuator Sweep Circuit Board

To remove the Attenuator Sweep circuit board, perform the following steps 1. Use a 1 16-inch Allen wrench to loosen the set screws in the following knobs and remove the knobs CH 1 and CH 2 VOLTS DIV Variable, SEC DIV Variable, and SEC DIV. Note the position of the SEC DIV knob for reinstallation reference. 2. Set the CH 1 and CH 2 VOLTS DIV switches to the same position then remove their knobs by pulling straight out from the front panel. Note switch positions for reinstallation reference. 3....

Auto Baseline Circuit

The Auto Baseline circuit (composed of U640A, Q605, and associated components) is enabled in both AUTO and TV FIELD triggering modes. This circuit provides a signal to the Sweep Generator circuit (Diagram 5) that initiates a sweep if a triggering signal is not received by the Schmitt Trigger circuit within a period of about 100 ms. A second output from the circuit illuminates the TRIG'D LED on the instrument front panel when the sweep is triggered. When adequate triggering signals are being...

Auto Trigger Circuit

When either AUTO or TV FIELD triggering is selected, the Auto Trigger circuit detects positive and negative peaks of the input trigger signal and produces output voltages that set the TRIGGER LEVEL control range to within the peak-to-peak amplitude of the triggering signal. The peak detectors are disabled when S611 is set to NORM, and fixed voltage levels are applied to both ends of TRIGGER LEVEL potentiometer R455. In either AUTO or TV FIELD, the TRIGGER MODE switch (S611) opens the Auto...

Buffer Amplifier and LowZ Attenuator

The Buffer Amplifier presents a high-impedance, low-capacitance load to the input signal and delivers an accurate replica of that signal to a low-impedance buffer output circuit. The Low-Z output circuit is composed of a 250-i2 voltage-divider network (R139F through R139J) and the Volts Div Var circuit (R141, C141, and R143). Switch S105B selects the appropriate output from the voltage divider. The Buffer Amplifier contains two paths a slow path consisting of R116, R117, U120, and R119 in...

Channel 1 Vertical Preamplifier

The Channel 1 Vertical Preamplifier produces differential output signals to drive the Vertical Output Amplifier and internal trigger signals to drive the Trigger circuitry. Differential signal current from the Attenuator circuitry is applied to common-base transistors Q157 and 0167 through cable-terminating resistors R151 and R161 respectively. The collector currents of 0157 and 0167 will flow through R158 and R168 to produce level-shifted signals which drive U170D and U170E. Balance...

Channel 2 Vertical Preamplifier

The Channel 2 Vertical Preamplifier functions the same as the Channel 1 Vertical Preamplifier previously described. with the exception of an additional pair of transistors that performs the inverting function. In the Normal mode of operation, Q257 and Q267 are biased on and Q258 and Q268 biased off by INVERT switch S264 grounding one end of R263. In the Invert mode (INVERT switch pressed in), cross-wired transistors Q258 and Q268 are biased on and Q257 and Q267 biased off by grounding the...

Channel Switching Logic Circuit

The Channel Switching Logic circuitry composed of U310A and U317A selects either Channel 1 or Channel 2 and various display modes for crt display via front-panel switches and the X-Y position of the SEC DIV switch. When the instrument is not in the X-Y Mode, signal line XY is grounded through contacts on the SEC DIV switch (Diagram 8). This action establishes LO logic levels on pins C, B, and G of front-panel switch S317 (CH 1-BOTH-CH 2) and on pins C and B of S305 (INT). Switch S317 selects...

Current Limit Circuit Board

To remove the Current Limit board, perform the following steps 1. Remove the High-Voltage shield (see the HighVoltage Shield removal procedure). 2. Disconnect the four single-wire connectors from the Current Limit board (P801, P802, P803, and P804). 3. Remove the screw and nut which secure the Current Limit board to the chassis frame. To reinstall the Current Limit board, perform the following steps 4. Reinstall the securing screw and nut (removed in step 5. Reconnect the four single-wire...

Delay Line Driver

The Delay Line Driver converts the signal current from the Diode Gates into a signal voltage for application to the Delay Line. The Delay Line Driver is configured as a differential shunt feedback amplifier and is composed of Q331, Q335, Q341, and Q345. Input currents to common- VERTICAL SIGNAL > TO DELAY LINE DRIVER Figure 3-3. Diode gate biasing for a Channel 1 display. emitter transistors Q331 and Q341 are converted to voltages at the bases of Q335 and Q345 respectively. Emitter-follower...

Delayedsweep Magnification

The delayed-sweep feature of the 2213A can be used to provide higher apparent magnification than is provided by the X10 Magnifier switch. Apparent magnification occurs as a result of displaying a selected portion of the trace (INTENS HORIZONTAL MODE) at a faster sweep speed (DLY'D HORIZONTAL MODE). When INTENS HORIZONTAL MODE is selected, the intensified zone indicates both the location and the start of the sweep that will be displayed in DLY'D HORIZONTAL MODE. Positioning of the intensified...

Digital Logic Conventions

Digital logic circuits perform many functions within the instrument. Functions and operation of the logic circuits are represented by logic symbology and terminology. Most logic functions are described using the positive-logic convention. Positive logic is a system of notation whereby the more positive of two levels is the TRUE (or 1) state the more negative level is the FALSE (or 0) state. In this logic description the TRUE state is referred to as HI, and the FALSE state is referred to as LO....

External Trigger Amplifier

The External Trigger Amplifier provides a means of triggering the instrument from an externally supplied signal that can be applied to the EXT INPUT connector. Input coupling to the Amplifier is selectable by the three-position EXT COUPLING switch, S401. In the AC position, the dc component of the external trigger signal is blocked by coupling the signal through C402. In the DC position, all components of the signal are coupled directly to the gate of Q411A through an input divider composed of...

Front Panel Circuit Board

To remove the Front-Panel circuit board, perform the following steps 1. Remove the crt (see the Cathode-Ray Tube removal procedure). 2. Remove the Attenuator Sweep circuit board (see the Attenuator Sweep Circuit Board removal procedure). 3. Remove the knobs from the following control shafts by pulling them straight out from the front panel Channel 1 and Channel 2 POSITION, Horizontal POSITION, AUTO FOCUS, AUTO INTENSITY, TRIGGER VAR HOLDOFF, and TRIGGER LEVEL. 27. Reinstall the High-Voltage...

High Voltage Shield

To remove the High-Voltage shield, perform the following steps 1. Remove the screw from the plastic high-voltage cover on the bottom section of the Main circuit board. Press gently on the rear of the cover and slide it forward. 6. Lift the shield up and out of the chassis frame by removing the right rear corner first. To reinstall the High-Voltage shield, perform the following steps 7. Insert the shield into the chassis frame. Make sure that the shield's right and back top edges are in their...

HighZ Attenuator

The first section of attenuator switch S105A directs the input signal to one of three paths directly through R103 (no attenuation) through a 10X attenuator consisting of C105, C107, R105, R106, R107, and R108 or through a 100X attenuator consisting of C111, C112, R110, R111, R112, R114, and R115. Medium-frequency normalization of the input capacitance is accomplished by Figure 3-2. Detailed block diagram of the Channel 1 attenuator and attenuator switching tables. LOW-Z ATTENUATOR -5- 1 > +...

Horizontal

HORIZONTAL MODE SEC DIV SEC DIV Variable X10 Magnifier DELAY TIME MULTIPLIER Midrange NO DLY 0.05 jus CAL detent Off (knob in) 0.5 us < X1 d. CHECK-Timing accuracy iswithin 3 (0.24 division) at the 10th vertical graticule line. Exclude the first 50 ns of the sweep from the measurement. e. Repeat parts b through d for the remaining SEC DIV switch settings and corresponding time-mark generator output (Normal) settings given in Table 4-4. g. CHECK Magnified timing accuracy for each SEC DIV...

Horizontal Output Amplifier

The Horizontal Output Amplifier converts the single-ended output of the Preamplifier into the differential output required to drive the crt horizontal deflection prates. The output stage consists of an input paraphase amplifier and an output complementary amplifier. Horizontal signal voltage from Q736 is applied to the base of Q763. The base of the other transistor (Q753) in the paraphase amplifier, is biased through a voltage divider composed of R758, R757, and R756. Horizontal centering...

Initial Control Settings

Connect the leveled sine-wave generator output via a T-connector and two 50-J2 cables to the EXT Z-AXIS INPUT connector on the rear panel and to the CH 1 OR X input connector. b. Adjust the generator controls to produce a 5-volt, 50 kHz display. Channel 1 POSITION VERTICAL MODE CH 1 VOLTS DIV CH 1 VOLTS DIV Variable HORIZONTAL MODE SEC DIV SEC DIV Variable c. CHECK For noticeable intensity modulation. The positive part of the sine wave should be of lower intensity than the negative part. b....

Initial Control Settingsprocedure Steps

Adjust Vertical Gain (R186, R286, R145, and R245) a. Connect a 100-mV standard-amplitude signal via a 50- 2 cable to the CH 1 OR X input connector. b. ADJUST-Ch 1 Gain (R186) for an exact 5-division display. c. Move the cable from the CH 1 OR X input connector to the CH 2 OR V input connector. Change the VERTICAL MODE switch to CH 2. d. ADJUST-Ch 2 Gain (R286) for an exact 5-division display. e. Change the generator output to 10 mV and set the CH 1 and CH 2 VOLTS DIV switches to 2 mV. f....

Input Coupling

The signal applied to the CH 1 OR X input connector can be ac-coupled, dc-coupled, or internally disconnected from the input of the High-Z Input Attenuator circuit. Signals applied to the CH 1 input connector are routed through resistor R101 to Input Coupling switch S101. When S101 is set for dc coupling, the CH 1 signal is applied directly to the input of the High-Z Attenuator stage. When ac-coupled, the input signal passes through R100 and dc-blocking capacitor C102. The blocking capacitor...

Input Coupling Capacitor Precharging

When the input coupling switch is set to GND, the input signal is connected to ground through the input coupling capacitor in series with a 1-Mi2 resistor to form a pre-charging network. This network allows the input coupling capacitor to charge to the average dc-voltage level of the signal applied to the probe. Thus, any large voltage transients that may accidentally be generated will not be applied to the amplifier input when the input coupling switch is moved from GND to AC. The precharging...

Inspection And Cleaning

The instrument should be visually inspected and cleaned as often as operating conditions require. Accumulation of dirt in the instrument can cause overheating and component breakdown. Dirt on components acts as an insulating blanket, preventing efficient heat dissipation. It also provides an electrical conduction path that could result in instrument failure, especially under high-humidity conditions. Avoid the use of chemical cleaning agents which might damage the plastics used in this...

Internal Trigger Amplifier

The Internal Trigger Amplifier converts the differential current input from the Trigger Pickoff circuit to a zero-referenced, single-ended output for use by the Trigger Level Comparator. Differential signals from the Pickoff Amplifier circuit are connected via R421 and R422 to common-base transistors U421E and U421D respectively. Transistor U421C and R428 constitute an inverting-feedback amplifier that converts U421D collector current to a voltage at the collector of U421C. This voltage is...

Internal Trigger Pickoff Amplifier

The Internal Trigger Pickoff Amplifier supplies trigger signals to the Internal Trigger Amplifier in the Trigger circuitry (Diagram 4). Internal trigger signals are provided by the vertical preamplifiers and are applied to the bases of U170B and U170C (for Channel 1) and U270B and U270C (for Channel 2). These transistor pairs are biased on, either individually or together, from the Internal Trigger Switching Logic circuit (Diagram 3). When Channel 1 is the selected internal trigger source, Q173...

Inverting Amplifier and TV Trigger Circuit

Current from one transistor of the conducting pair of transistors chosen by SLOPE switch S464 is applied to U480C pin 10. Current from the other side of the Comparator is applied to pin 14 at the output side of U480C through R468. Pin 11 of U480C is at a LO logic level except when TV FIELD triggering is enabled. This LO does not affect circuit operation in either AUTO or NORM triggering. NOR-gate U480C is an emitter-coupled logic (ECL) device that is operated in the linear region. In the linear...

Limits And Tolerances

The limits and tolerances stated in this procedure are instrument specifications only if they are listed in the Performance Requirements column of the Specification (Section 1). Tolerances given are applicable only to the instrument undergoing adjustment and do not include test equipment error. Adjustment of the instrument must be accomplished at an ambient temperature between +20 C and +30 C, and the instrument must have had a warm-up period of at least 20 minutes.

Line Fuse

The instrument fuse holder is located on the rear panel (see Figure 2-2) and contains the line fuse. Verify that the proper fuse is installed by performing the following procedure 1. Unplug the power cord from the power-input source (if applicable). 2. Press in and slightly rotate the fuse-holder cap counterclockwise to release it. 3. Pull out the cap from the fuse holder, with the fuse attached to the inside of the cap. 4. Note fuse values and verify proper size (2 A, 250 V, fast-blow). 5....

List Of Illustrations

2-1 Power-input-voltage 2-2 Line fuse and power 2-3 Power, display, and probe adjust controls, connector, and indicator 2-3 2-4 Vertical controls and 2-5 Horizontal 2-6 Trigger controls, connector, and 2-7 Rear-panel 2-8 Graticule measurement 3-1 Basic block diagram of the 2213 3-2 Detailed block diagram of the Channel 1 attenuator and attenuator switching tables 3-5 3-3 Diode gate biasing for a Channel 1 3-4 CHOP VERTICAL MODE 3-5 Sweep timing 3-6 Simplified diagram of the Z-Axis Switching...

List Of Tables

1-1 Electrical 1-2 Environmental 1-3 Physical 4-1 Test Equipment 4-2 Deflection Accuracy 4-3 Settings for Bandwidth 4-4 Settings for Timing Accuracy 4-5 Delay Time Range 4-6 Switch Combinations for Triggering 5-1 Adjustment 5-2 Power Supply Limits and 5-3 Deflection Accuracy 5-4 Attenuator Compensation 5-5 Settings for Bandwidth 5-6 Timing 5-7 Settings for Timing Accuracy 5-8 Delay Time Range 5-9 Switch Combinations for Triggering 6-1 Relative Susceptibility to Static-Discharge 6-2 External...

Lj1f

And a voltage divider composed of R645 and R646 establish the charging voltage of holdoff timing capacitors C645, C646, and C647. The capacitor (or combination of capacitors) used is switched into the holdoff circuit by contacts on S630B, the SEC DIV timing switch. During holdoff time, while U640B pin 9 remains LO, the output of U607C will be HI. Inverter U607B will invert the HI to a LO logic level that is then applied to the Reset inputs of both U603A and U603B at pins 1 and 13 respectively....

Maintenance

Inspect the external portions of the instrument for damage, wear, and missing parts use Table 6-2 as a guide. Instruments that appear to have been dropped or otherwise abused should be checked thoroughly to verify correct operation and performance. Deficiencies found that could cause personal injury or could lead to further damage to the instrument should be repaired immediately. To prevent getting moisture inside the instrument during external cleaning, use only enough liquid to...

Obtaining Replacement Parts

Most electrical and mechanical parts can be obtained through your local Tektronix Field Office or representative. However, many of the standard electronic components can usually be obtained from a local commercial source. Before purchasing or ordering a part from a source other than Tektronix, Inc., please check the Replaceable Electrical Parts list (Section 8) for the proper value, rating, tolerance, and description. Physical size and shape of a component may affect instrument performance,...

Periodic Readjustment

To ensure accurate measurements, check the performance of this instrument after every 2000 hours of operation, or if used infrequently, once each year. In addition, replacement of components may necessitate readjustment of the affected circuits. Complete Performance Check and Adjustment instructions are given in Sections 4 and 5. The Performance Check Procedure can also be helpful in localizing certain trouble in the instrument. In some cases, minor problems may be revealed or corrected by...

Power Cord

For the 120-V North American customer, the 2213 is delivered with a three-wire power cord permanently attached. At the end of the cord is a three-contact plug for connection to the power source and to protective ground. The plug's protective-ground contact connects (through the protective-ground conductor) to the accessible metal parts of the instrument. For electrical-shock protection, insert this plug only into a power-source outlet that has a securely grounded protective-ground contact. For...

Power Display And Probe Adjust

Refer to Figure 2-3 for location of items 1 through 7. Internal Graticule Eliminates parallax viewing error between the trace and graticule lines. Rise-time amplitude and measurement points are indicated at the left edge of the graticule. (T ) POWER Switch Turns instrument power on and off. Press in for ON press again for OFF. (jT) AUTO FOCUS Control-Adjusts display for optimum definition. Once set, the focus of the crt display will be maintained as changes occur in the intensity level of the...

Power Supply

The Power Supply circuitry converts the ac-source voltage into the various voltages needed for instrument operation. It consists of the Power Input, Preregulator, and Inverter circuits (which drive the primary of the power transformer) and other Secondary circuits (which produce the necessary supply voltages for the instrument). This instrument has either the Current Limit board (A19) or the Preregulator board (A18) installed as part of the power supply. Refer to the appropriate circuit...

Power Supply And Crt Display

Leveled Sine-Wave Generator (Item 2) Test Oscilloscope and 1X Probe (Item 12) See AEMtMVMM(W tiKATWtl 1 at the back o f this manual for location of test points and adjustments. See AEMtMVMM(W tiKATWtl 1 at the back o f this manual for location of test points and adjustments. Before applying power to the 2213, make the initial control settings. Connect the 2213 to an appropriate power source through a variable autotransformer, adjusted for an output of 115 V. Apply power to both the instrument...

Preparation For Adjustment

It is necessary to remove the instrument cabinet to perform the Adjustment Procedure. See the Cabinet removal instructions located in the Maintenance section of the manual. Before performing this procedure, do not preset any internal controls and do not change the 8.6-V Power-Supply adjustment, since that will typically necessitate a complete readjustment of the instrument, when only a partial readjustment might otherwise be required. To avoid unnecessary readjustment, only change an internal...

Preregulator Circuit Board

To remove the Preregulator circuit board, perform the following steps 1. Remove the High-Voltage shield (see the HighVoltage Shield removal procedure). 2. Remove two screws securing the Preregulator board mounting brackets (one at the rear-top of the frame and one on the right side near the back corner of the frame). 3. Remove the securing screw through the access hole of the clear plastic shield from the top of the Preregulator board at the front-right corner. 4. Disconnect four wire...

Rear Panel

Refer to Figure 2-7 for location of item 32. 32) EXT Z AXIS Connector Provides a means of connecting external signals to the Z-axis amplifier to intensity modulate the crt display. Applied signals do not affect display waveshape. Signals with fast rise times and fall times provide the most abrupt intensity change, and a 5-V p-p signal will produce noticeable modulation. The Z-axis signals must be time-related to the display to obtain a stable presentation on the crt. FOR CONTINUED FIRE...

Repackaging For Shipment

If the instrument is to be shipped to a Tektronix Service Center for service or repair, attach a tag showing owner (with address) and the name of an individual at your firm that can be contacted. Include complete instrument serial number and a description of the service required. Listings of Tektronix Sales and Service offices, both domestic and international, are located at the back of the manual following the tabbed Accessories page. Save and reuse the package in which your instrument was...

Schmitt Trigger Circuit

With a LO on U480B pin 7, the output at pin 3 goes LO as soon as the signal on U480B pin 6 reaches the switching threshold. The LO is applied to U480A pin 4 and, together with the fixed LO on pin 5, causes the output of U480B pin 6 via R480 to reinforce the switching action. As a result, the output signal at U480A pin 2 switches rapidly. When the level from the filter network falls to the LO threshold level, the feedback supplied by R480 holds the Schmitt Trigger switched HI for a short time....

Signal Connections

Generally, probes offer the most convenient means of connecting an input signal to the instrument. They are shielded to prevent pickup of electromagnetic interference, and the supplied 10X probe offers a high input impedance that minimizes circuit loading. This allows the circuit under test to operate with a minimum of change from its normal condition as measurements are being made. Coaxial cables may also be used to connect signals to the input connectors, but they may have considerable effect...

Signal Display

Apply a signal to either vertical-channel input connector and set the VERTICAL MODE switch to display the channel used. To display two time-related input signals use both vertical-channel input connectors and select BOTH VERTICAL MODE then select either ALT or CHOP, depending on the frequency of input signals. 3. Adjust the AUTO INTENSITY control for desired display brightness. If the display is not visible with the AUTO INTENSITY control at midrange, press the BEAM FIND push button and hold it...

Soldering Techniques

The reliability and accuracy of this instrument can be maintained only if proper soldering techniques are used to remove or replace parts. General soldering techniques, which apply to maintenance of any precision electronic equipment, should be used when working on this instrument. To avoid an electric-shock hazard, observe the following precautions before attempting any soldering turn the instrument off, disconnect it from the ac power source, and allow approximately three minutes for the...

Staticsensitive Components

The following precautions are applicable when performing any maintenance involving internal access to the instrument. Static discharge can damage any semiconductor component in this instrument. This instrument contains electrical components that are susceptible to damage from static discharge. Table 6-1 lists the relative susceptibility of various classes of semiconductors. Static voltages of 1 kV to 30 kV are common in unprotected environments. When performing maintenance observe the following...

Sweep Generator And Logic

The Sweep Generator and Logic circuitry, shown on Diagram 5, produces a sawtooth voltage that is amplified by the Horizontal Amplifier to provide horizontal deflection on the crt. This sawtooth voltage (sweep) is produced on command from the Sweep Logic circuits. The Sweep Generator circuits also produce gate waveforms that are used by the Auto Intensity and Z-Axis circuits to establish the correct timing of the crt unblanking and intensity levels used for viewing the display. See Figure 3-5...

Sweep Logic

Following the sweep completion, a finite time is required to discharge the timing capacitor. The Sweep Logic circuit is prevented from responding to a trigger signal during this time by the Holdoff circuit. The end of sweep (and start of the holdoff period) is determined by the End-of-Sweep Comparator (Q640). The Sweep ramp waveform is applied to the base of Q640 through both a voltage divider and a biasing network composed of R637, R638, and C637. When the ramp amplitude reaches the threshold...

Test Equipment Required

The test equipment listed in Table 4-1 is a complete list of the equipment required to accomplish both tne Performance Check Procedure in this section and the Adjustment Procedure in Section 5. Test equipment specifications described in Table 4-1 are the minimum necessary to provide accurate results. Therefore, equipment used must meet or exceed the listed specifications. Detailed operating instructions for test equipment are not given in this procedure. If more operating information is...

Transistors And Integrated Circuits

Transistors and integrated circuits should not be replaced unless they are actually defective. If unsoldered from the circuit board during routine maintenance, return them to their original board locations. Unnecessary replacement or transposing of semiconductor devices may affect the adjustment of the instrument. When a semiconductor is replaced, check the performance of any instrument circuit that may be affected. Any replacement component should be of the original type or a direct...

Tv Signal Displays

Perform the steps and set the controls as outlined under Baseline Trace and Signal Display to obtain a basic display of the desired TV signal. 2. Set A SEC DIV to 10 ms, and A & B INT to CH 1 or CH 2 as appropriate for applied signal. 3. Set A TRIGGER SLOPE for a positive-going signal (lever up) if the applied TV signal sync pulses are positive-going, or for a negative-going signal (lever down) if the TV sync pulses are negative-going. 4. Adjust the A TRIGGER LEVER control for a stable...

Vertical

Refer to Figure 2-4 for location of items 8 through 16. SERIAL and Mod Slots-The SERIAL slot is imprinted with the instrument's serial number. The Mod slot contains the option number that has been installed in the instrument. CH 1 OR X and CH 2 OR Y Connectors-Provide for application of external signals to the inputs of the vertical deflection system or for an X-Y display. In the X-Y mode, the signal connected to the CH 1 OR X connector provides horizontal deflection, and the signal connected...

Vertical Attenuators

Both the Channel 1 and Channel 2 Attenuator circuits, shown in Diagram 1, are identical in operation. In the following discussion, only the Channel 1 Attenuator circuit is described. The matching components in the Channel 2 Attenuator circuit perform the same function. The Attenuator circuit (see Figure 3-2) provides control of input coupling, vertical deflection factor, and variable volts-per-division balance. Input signals for crt vertical deflection may be connected to either or both the CH...

Vertical Output Amplifier

The Vertical Output Amplifier, also shown on Diagram 3, provides final amplification of the input signals for application to the deflection plates of the crt. Signals from the Delay Line are applied to a differential amplifier input stage composed of Q350 and Q360. The Delay Line is terminated in the proper impedance by resistors R338 and R348. Resistor R355 sets the gain of Q350 and Q360. Thermal compensation of the stage gain is provided by thermistor RT356, connected in series with R356...

Volts Div Var Circuit and X1X10 Amplifier

The appropriate voltage divider signal output (-M, +2.5, or -i-5) is selected by VOLTS DIV switch S105B and routed to the Volts Div Var circuit composed of C141, R141, and R143 Changes that occur in the Buffer Amplifier output impedance due to setting R141 or switching the divider output are sensed via R139M. These changes modify the slow-path feedback signal to cause U120 to again match the gain of both paths. From the Volts Div Var circuit, the signal is applied to the input of the X1 X10...

Index To Performance Check Steps

Check Deflection Accuracy and Variable Range . . . 4-4 2. Check Bandwidth 4-5 3. Check Common-Mode Rejection Ratio 4-5 1. Check Timing Accuracy 4-6 2. Check SEC DIV Variable Range 4-7 3. Check Delay Time Range 4-7 4. Check Delay Time Jitter 4-7 5. Check POSITION Control Range 4-8 6. Check X-Gain 4-8 7. Check 1. Check Internal Triggering 4-9 2. Check External Triggering 4-10 1. Check EXT Z-AXIS Operation 4-12 2. Check PROBE ADJUST Operation 4-12

XY Amplifier

When the X-Y display mode is selected using the SEC DIV switch, the XY signal line goes LO and XY Switch transistor Q720 is biased off. The XY signal is also applied to FET Q714 (used as a switch to prevent crosstalk) in the XY Amplifier to bias it on. With this action, the XY Amplifier is enabled to pass X-Axis signals on to the Horizontal Preamplifier. Another function of the XY signal is to disable the Sweep Generator to prevent the Sweep signal from being applied to the Horizontal...

Introduction

This section contains a functional description of the 2213 Oscilloscope circuitry. The discussion begins with a general summary of instrument functions followed by a detailed description of each major circuit. Functional block diagrams and schematic diagrams are used to show the interconnections between parts of the circuitry, to indicate circuit components, and to identify interrelationships with the front-panel controls. Schematic diagrams and the overall block diagram are located in the...

Delay Circuit

The Delay circuit, composed of Q624, Q632, Q644, Q650, Q652, U607D, and associated components, generates the timing and gate signals required to produce the intensified Sweep display and to provide the variable Sweep delay. HORIZONTAL MODE switch S650 controls the display mode (NO DLY, INTENS, or DLY'D), and DELAY TIME switch S660 selects the basic delay time (0.2 ms, 10 jus, or 0.5 ms). The DELAY TIME MULTIPLIER control (R658) increases the possible delay available by up to at least twenty...

Trigger Source Switching Circuit

Trigger signal selection is accomplished by using the SOURCE switch (S440) to enable one of three triggering signal paths (internal, external, or line) to the Trigger Level Comparator circuit. With S440 set to INT, the inhibiting voltage is removed from R438, causing both U421B and diode CR440 to be biased on. The internal trigger signal is then passed from the emitter of U421B through diode CR440 to the Trigger Level Comparator and Auto Trigger circuits. The SOURCE switch prevents the line and...

Inverter

The Inverter circuit changes the dc voltage from the Preregulator to ac for use by the supplies that are connected to the secondaries of T940. The output of the Preregulator circuit is applied to the center tap of T940. Power-switching transistors Q940 and Q942 alternate conducting current through R941 from the primary circuit common to the Preregulator output line. The transistor switching action is controlled by T942, a saturating base-drive transformer. When the instrument is first turned...

Miller Sweep Generator

The Miller Sweep circuit is composed of Q630A, Q630B, Q631, and associated timing components. The circuit operates to hold the charging current to the timing capacitor at a constant value. When a capacitor is charged in this manner, the rise of voltage across the capacitor is linear rather than exponential. Field-effect transistors Q630A and Q630B are matched devices. As such, the lDSS (drain current with gate-to- source shorted) characteristics of each are nearly identical. FET Q630B acts as a...

1 Check Adjust Power Supply DC Levels and Ripple R946 and R952

Review the information at the beginning of the Adjustment Procedure before starting this step. a. Remove the High-Voltage shield (see the HighVoltage Shield removal procedure in Section 6) if the instrument has the Current Limit board (A19). If the instrument has the Preregulator board (A18), remove the protective shield on the bottom of the Main board (A10) to access the test point pads. To avoid electric shock and instrument damage when checking either the Head Room Voltage or the...

Troubleshooting Techniques

The following procedure is arranged in an order that enables checking simple trouble possibilities before requiring more extensive troubleshooting. The first four checks ensure proper control settings, connections, operation, and adjustment. If the trouble is not located by these checks, the remaining steps will aid in locating the defective component. When the defective component is located, replace it, using the appropriate replacement procedure given under Corrective Maintenance in this...

Cathode Ray Tube

Breakage of the crt may cause high-velocity scattering of glass fragments (implosion). Protective clothing and safety glasses should be worn. Avoid striking the crt on any object which may cause it to crack or implode. When storing a crt, either place it in a protective carton or set it face down on a smooth surface in a protected location with a soft mat under the faceplate. To remove the crt, perform the following steps 1. Disconnect four deflection-plate wires...

Internal Trigger Switching Logic

Internal trigger-selection signals to the Trigger Pickoff Amplifier (Diagram 2) are produced in a logic circuit composed of U305B, U305C, U305D, U315B, and U315C. The TRIGGER INT Source switch (S305), in conjunction with CH 1-BOTH-CH 2 switch (S317), determines the internal trigger source selected. When either the CH 1 or CH 2 Internal Trigger signal is selected by S305, the selected channel will be the internal trigger source. When VERT MODE is selected as the internal trigger signal, the...

External Zaxis And Probe Adjust

Leveled Sine-Wave Generator (Item 2) P6120 Probe (provided with instrument) a. Connect the leveled sine-wave generator output via a T-connector and two 50-i2 cables to the EXT Z-AXIS INPUT connector on the rear panel and to the CH 1 OR X input connector. b. Adjust the generator controls to produce a 5-volt, 50 kHz display. Channel 1 POSITION VERTICAL MODE CH 1 VOLTS DIV CH 1 VOLTS DIV Variable c. CHECK For noticeable intensity modulation. The positive part of the sine wave should be of lower...

Current Limit Board Configuration

The Power switch (S901 ) connects the line voltage to the instrument through line fuse F901 and transient suppressor VR901. Suppressor VR901 protects the instrument from large voltage transients. High-frequency line noise is attenuated by C901. The Preregulator circuit converts the ac-power-source input voltage to a regulated dc voltage. A triac is used as a switch to conduct current during a controlled period of the inpuMine-voltage cycle so that energy to be used by the Inverter circuit is...

Performance Conditions

The following electrical characteristics (Table 1-1) are valid for the 2213 when it has been adjusted at an ambient temperature between +20 C and +30 C, has had a warm-up period of at least 20 minutes, and is operating at an ambient temperature between 0 C and +50 C (unless otherwise noted). Items listed in the Performance Requirements column are verifiable qualitative or quantitative limits, while items listed in the Supplemental Information column are either explanatory notes, calibration...

General Description

In the following overall functional description of the 2213 Oscilloscope, refer to the basic block diagram (Figure 3-1) and to the detailed block diagram (Figure 9-4) located in the Diagrams section of this manual. In Figures 3-1 and 9-4, the numbered diamond symbol in each major block refers to the appropriate schematic diagram number. Signals to be displayed on the crt are applied to either the CH 1 OR X input connector or the CH 2 OR Y input connector. The signals may be coupled to the...

Trigger Level Comparator

The Trigger Level Comparator circuit determines both the trigger level and slope at which a triggering signal is produced. Transistors U460E and U460B form a comparator circuit. It compares the trigger signal level applied to the base of U460E with the reference dc level set by the TRIGGER LEVEL potentiometer R455 and applied to the base of U460B. Slope switching is accomplished by controlling the biasing of transistor pairs U460A-U460D and U460C-U460F. When AUTO or TV FIELD triggering is...

Preparation

Test equipment items 1 through 9 in Table 4-1 are required to accomplish a complete Performance Check. At the beginning of each subsection, in both the Performance Check Procedure and the Adjustment Procedure sections, there is an equipment-required list showing only the test equipment necessary for performing the steps in that subsection. In this list, the item number that follows each piece of equipment corresponds to the item number listed in Table 4-1. This procedure is structured in...

Auto Intensity

The purpose of the Auto Intensity circuit, shown in Diagram 6, is to keep the intensity of the trace on the crt at a constant level with changing sweep speeds and trigger signal repetition rates. In conventional oscilloscopes, as the duty cycle of the displayed trace changes, the intensity will vary. The Auto Intensity circuit compensates for this effect by increasing the Z-Axis Drive voltage for low Sweep duty factors. The elements of the Auto Intensity circuit consist of four blocks the...