46 Lowvoltage Power Supply

The low-voltage power supply includes an independent supply (-100 volts) and three dependent supplies (+250, +100 and -12.6 volts). The -100 volt supply is a reference for the +100 volt supply. A breakdown diode serves as the reference for the -12.6 volt supply. The +250 volt supply is obtained by stacking a 150-volt supply on top of the +100 volt supply. 4-8. Figure 4-2 is a simplified block diagram of a regulated power supply. The series regulator acts Figure 4-2. Regulated Power Supply...

424 Trace Align

Trace-aligning coil L302 is located around the CRT near its screen. Adjustment of Trace Align R350A B varies the magnitude and direction of current through the coil, which has the effect of rotating the trace. In this way the trace is brought into alignment with the CRT graticule. Table 5-1. Equipment Required for Tests and Adjustments Table 5-1. Equipment Required for Tests and Adjustments Calibrator check High Voltage Adjustment Calibrator Adjustment Outputs of lv and lOv p-p -300v DC...

531 Repair And Replacement

Inspect the air filter at the rear of the instrument and clean it before it becomes clogged enough to restrict the flow of cooling air. To clean, remove the filter from the instrument and wash it thoroughly in warm water and detergent. Dry thoroughly and coat with a filter adhesive such as Filter Coat No. 3 from Research Products Inc. This adhesive is available from heating supply stores or from your Hewlett-Packard Engineering Representative. 5-35. It is recommended that a face mask or...

513 Adjustment Of Highvoltage Supply

Connect a Model 11044A 100 1 Voltage Divider to the DC probe of a Model 410B Voltmeter. b. Set Voltmeter to 3-volt -DC range. c. Set the Voltmeter Calibrator for -300 volts DC output, and connect divider tip to the output. Figure 5-1. Component Locations, Top View Figure 5-1. Component Locations, Top View d. Set the gain adjustment of the Model 410B (located at the rear of the instrument) for a reading of exactly 3 volts. e. Set the Voltmeter to the 30-volt range, and measure the high...

41 General

Figure 4-1 is a simplified block diagram of the Model 140A Oscilloscope. Three major circuits are included in the main unit of the oscilloscope a low-voltage power supply, an amplitude-and-time calibrator, and a high-voltage power supply for the cathode-ray tube. The vertical and horizontal plugins are not part of the main unit, and operate directly into the CRT. 4-3. LOW-VOLTAGE POWER SUPPLY. The low-voltage power supply uses 115 230 volt single-phase power from the line, and generates...

418 Highvoltage Power Supply

Figure 4-3 is a block diagram of the high voltage power supply. The output of a regulated transistor oscillator is stepped up in voltage and applied to a series of high-voltage rectifiers. The positive output of the voltage doubler is connected to the post-accelerator of the CRT. The negative output voltages are used in the gun assembly of the CRT and its associated controls. The Z-AXIS INPUT can be used to apply an intensity modulating signal to the cathode of the CRT. 4-20. Figure 5-8...

List Of Illustrations

Model 140A Oscilloscope with Model 1400A Amplifier and Model 1420A 1-2. Cathode-Ray Tube Warranty 1-3 2-1. Rack Mounting Procedure 2-0 3-1. Model 140A Controls 3-2 4-1. Model 140A Block Diagram 4-1 4-2. Regulated Power Supply Block Diagram 4-2 4-3. High-Voltage Power Supply Block 5-1. Component Locations, Top View 5-2 5-2. Adjustment and Component Locations Bottom View 5-3 5-3. Removal of High-Voltage Deck Assembly 5-8 5-4. Component Locations on High-Voltage 5-5....

17 Associated Equipment

Tube Oscilloscope

Some of the plug-ins available for the Model 140A Oscilloscope are listed in Table 1-2. The Model 140A normally is used with an amplifier plug-in in the lower compartment and a sweep plugin in the upper compartment. The plug-in in the lower compartment produces vertical deflection, and the plug-in in the upper compartment produces horizontal deflection. All Model 1400-series plug-ins can be used with the Model 140A Oscilloscope. Plug-in model numbers are grouped according to function...

Oscilloscope

Copyright HEWLETT-PACKARD COMPANY 1963 1501 PAGE MILL ROAD, PALO ALTO. CALIFORNIA, U.S.A. 01638-1 Printed JULY 1963 I GENERAL INFORMATION 1-1 1-1. 1-5. 1-7. Associated Equipment 1-1 1-10. Instrument Identification 1-2 1-12. Cathode-Ray Tube Warranty . . 1-2 2-1. Incoming Inspection 2-1 2-4. Power Requirements 2-1 2-6. 230-Volt Operation 2-1 2-8. Three Conductor Power Cable 2-1 2-10. 2-11. Ventilation Requirements . 2-1 2-13. Air Filter 2-1 2-15. Instrument Mounting 2-1 2-16. Modular Cabinet 2-1...