## 23 Preparing For Operation 24 Unpacking

Your 8024A, this manual, one 9V battery, and two test leads (one red and one black) were shipped to you in a specially designed container. Check the shipment carefully and contact the place of purchase immediately if anything is wrong. If the place of purchase fails to satisfy you, contact the nearest John Fluke Service Center. A list of these service centers is located at the end of Section 5 in this manual. 2-6. If reshipment is necessary, please use the original shipping container. If...

## 251 Temperature Conversion

The temperature measurements made with your 8024A are displayed in C. To find the equivalent temperature in F, either use the conversion tables in Table 2-3 or the formula 1.8 ( C) + 32 F. -100 0 100 300 500 700 900 1100 1300 ADD THE APPROPRIATE CORRECTION FACTOR TO THE DISPLAYED VALUE FROM PLOT, CORRECTION FACTOR -19 C ACTUAL TEMPERATURE 800 19 - 781 C 19 Figure 2-13. Temperature Correction Factor for K-Type Thermocouples Table 2-3. Centigrade-to-Fahrenheit Conversion Scale Table 2-3....

## 257 ACDC Voltage Measurements

The 8024A is equipped with five ac and five dc voltage ranges 200 mV, 2V, 20V, 200V, 750V ac lOOOV dc. All ranges present an input impedance of 10 Mil. On theac ranges, this is shunted by less than 100 pF. When making measurements, be careful not to exceed the overload limits given earlier in Table 2-2. 2-59. Measurement errors due to circuit loading can result when making either ac or dc voltage measurements on circuits with high source resistance. However, in most cases the error is...

## 314 Voltage Measurement Function

Both ac and dc voltage measurement functions use an overvoltage protected 10 Mil input divider to scale down the input voltage. Under normal conditions (assuming a dc input signal on the proper range) the divider output is a dc voltage that is directly proportional to the input signal level. If the AC function is selected, the output of the divider is ac coupled to an active full-wave rectifier whose dc output is calibrated to equal the rms level of the ac input (for sine wave inputs). If...

## 316 Current Measurement Function

Current measurements are made using a fuse protected, switchable, current shunt (0.I fi, 1ft, 1 Oil, or 1 OOil) to perform the current-to-voltage conversion required by the a d converter (Figure 3-5). The voltage (I R) drop produced across the selected shunt may be either ac or dc. If the input current is dc and the DC function is selected, the I R drop is passed through a low-pass filter, and presented as the unknown input to the a d converter. However, if the input current is ac and the...

## 318 Temperature C Measurement Function

As Figure 3-6 shows, the input from the thermocouple accessory is applied across the mA and COMMON terminals. If the PEAK HOLD switch is in the OFF position the input will be routed through a filter to the a d converter unknown input. The COMMON terminal is thermally tied to the collector and base leads of transistor Q3. (This provides reference junction temperature compensation.) Q3 changes with temperature and provides an offset voltage to counter the thermocouple at the input jacks to...

## 320 Resistance Measurement Function

Resistance measurements are made using a ratio technique as shown in Figure 3-7. When the kfl function is selected, a simple series of circuits are formed by the internal reference voltage, a reference resistor from the voltage divider (selected by range switches), and the external unknown resistor. The ratio of the two resistors is equal to the ratio of their respective voltage drops. Therefore, since the value of one resistor is known, the value of the second can be determined by using...

## 323 Conductance Measurement Function

Conductance measurements are made using a ratio technique similar to that used in making resistance measurements (Figure 3-7). The main differences are only one range is provided (200 nS), and the function of the range resistor and the unknown resistor in the measurement cycle is reversed. That is, the voltage drop across the range resistor is used as the unknown input during the integrate period, and the voltage across the unknown resistor is used for the reference input during the read...

## 325 Peak Hold Circuit Level

As Figure 3-8 shows, the peak hold circuit consists of an operational amplifier (U19) and a capacitor (CI9) which is across the a d converter (U8) input. When the PEAK HOLD switch is set to the ON position, switch action removes the normal input to the a d converter and routes the output of the signal conditioners to U19. The operational amplifier charges C19 to the peak positive input signal to the DM M. The charge on C19 is the unknown value that the a d converter reads to determine the...

## 43 Service Information

The 8024A is warranted for a period of 1-year upon delivery to the original purchaser. Conditions of the warranty are given at the end of this manual. 4-5. Malfunctions that occur within the limits of the warranty will be corrected at no charge. Simply mail the instrument (postpaid) to your nearest authorized (in-warranty) Fluke Technical Service Center. A complete list of service centers is provided at-the end of this manual. Dated proof-of-purchase will be required for all in-warranty...

## 431 Resistance Conductance Test

Use the following procedure to verify the proper operation of both the kil and nS measurement functions 1. On the UUT set the mA- C-V kfl nS function switch to the in position. 2. Connect the equipment as shown in Figure 4-3. 3. For each step of Table 4-5 set the AC DC switch to the indicated position, select the listed range, program the DMM Calibrator for the corresponding UUT input, and verify that the UUT displayed value is within the indicated limits.

## 437 Level Detector Test

Use the following procedure to verify the proper operation of the level detector function 1. Select the kfl function, 200 kfl range. 2. Program the pulse generator for a single pulse that is greater than SO jusec wide and 0 to 3V 0.5 in amplitude. 3. Connect the pulse generator to the UUT + to the V kft nS terminal and - to the COMMON terminal. 4. Cause the pulse generator to output single pulses and verify that the A up arrow appears momentarily in the LCD of the UUT for each single...

## 61 Introduction

This section of the manual contains information concerning the accessories available for use with the Model. 8024A Digital Multimeter (there are no options available at this time). The accessories, some of which are shown in Figure 6-1, are described in general terms under a separate major heading containing the accessory model number. The depth of detail is intended to give the prospective user an adequate first acquaintance with the features and capabilities of each accessory. Additional...

## 614 Specifications

Range -150 C to 260 C (-238 F to 500 F) continuous. Accuracy (With respect to NBS tables) 2.2 C (4 F) over the range of-17.8 C to 260 C (0 F to 500 F). (Above accuracy and range specifications apply to thermocouple accessory only. Use 8024A Temperature function specifications when using the Y8103 accessory with the 8024A multimeter.) Time Constant 2 seconds (for air at room temperature and one atmosphere of pressure moving with a velocity of 65 ft sec).

## 646 Acdc Current Probe Y8100 647 Introduction

The Fluke Y8100 DC AC Current Probe is a clamp-on probe that is used with a voltmeter, multimeter, or oscilloscope to read dc, ac, or composite (ac on dc) current measurements. The jaws on the Y8100 are designed to clamp around conductors up to 3 4 inch in diameter. The pistol shape allows safe, easy, one-hand operation when making current measurement. The Model Y8100 probe is battery powered with size AA cells. It measures current to 200A dc or ac rms using most any voltmeter. Two...

## 649 Specifications

Rated Output 2V at fun range. Accuracy 200 Hi to 1 kHz < 100 A add +3 reading, > 100A add 6 reading. Calibration Cycle l year. Frequency Response dc to 1.0 kHz. Recommended Load 3.0 kfl. Temperature Range +15 C to +35 C for specified accuracy -10 C to +50 C storage and operation at reduced accuracy. Working Voltage Rating Core to output 600V dc or480V ac Max output to ground Aperture Size 3 4 (19 mm) diameter. Size - Overall 9 x 4-1 2 x 1-7 16 (230 mm x...

## CtoDC Transfer Ratio 23 5 C

Extended Frequency Response Useful for relative readings from 20 kHz to 250 MHz. Response Responds to peak value of input calibrated to read rms value of a sine wave. Voltage Range 0.25 to 30V rms. Maximum DC Input 350V dc. Temperature Coefficient (0 to 18 C, 28 to 50 F) 0.1 of ac-to-dc transfer ratio specifications per C. Input Impedance 12 Mil shunted by 15 pF.

## Batteryfuse Replacement Should Only Be Performed After The Test Leads Have Been Removed From The Input Jacks And The

Refer to Section 2 of this manual for battery and main fuse (Fl) replacement procedure. Use the following procedure to replace the backup fuse (F2). 1. Complete the Backup Fuse and Calibration Access Procedure located earlier in this section. 2. Using a pointed tool such as a probe tip, pry the backup fuse from its holder. 3. Replace the defective backup fuse with a 3A, 600V type BBS-3 only. 4-21. PERFORMANCE TEST 4-22. The performance tests are used to compare the 8024A performance with...

## Frequency Response Relative to ACtoDC Transfer Ratio

0.25 to 0.5V 0.25 to 0.5V 1.5 dB 0.5 to 2.0V 0.5 to 2.0V 0.5 dB 2.0 to 5.0V 2.0 to 5.0V 1.0 dB 'Frequency response and ac-to-dc transfer ratio specifications assume the use of the probe's BNC adapter and a probe output termination of 10 Mil 10 shunted by less than 200 pF. Extended Frequency Response Useful for relative readings from 20 kHz to 700 MHz. Response Responds to peak value of input, and is calibrated to an rms value Of a sine wave.

## Instrument Damage And Operator Injury May Result If The Fuse Blows While Current Is Being Measured In A Circuit Which

Four ac and four dc current ranges are included on the 8024A 2 mA, 20 mA, 200 mA, and 2000 mA. Each range is diode protected to 2 amps and fuse protected above 2 amps. If the fuse blows, refer to fuse replacement information given earlier in this section. 2-62. In high electrical noise environments (near ignition switches, fluorescent lights relay switches, etc.) unstable or erroneous readings (exceeding specifications) may occur. The effect is most obvious when measuring low level...

## Interpolation Table lno

Where Rs Source resistance in ohms of circuit being measured. First, determine input impedance, as follows * Jfll Where Zin effective input impedance Then, determine source loading error as follows ' Where Zs source impedance Zin input impedance (calculated) Figure 2-16. Voltage Measurement Error Calculations To avoid possible instrument damage and or erroneous measurements, remove the temporary V kfi nS-to-mA jumper before attempting voltage or resistance measurements. 2-63. Full-scale burden...

## Maximum Temperature Rating 927 c 1700F Sheath Material inconei

Dimensions 3.175 mm (1 8 inch) in diameter, 15.24 cm (6 inches) in length Junction Type K (Chromel vs Alumel). Grounding Junction grounded to sheath. Handle Maximum Temperature Rating 204.4 c (400 F) continuous. Conductors Type K. Size AWG 24 stranded (7 strands of 32). Length 48 inches nominal Insulation Voltage Rating 1000V (between wire and outside of both layers of insulation). Maximum Temperature Rating 105 c (220 F) continuous. Connector Dual Banana Isothermal Termination (3 4 inch...

## Note

The PEAK-HOLD switch and Function switches are push-push type. Operate these switches by pushing to the RIGHT only Do not push or pull these switches to the left (out or off) positions. Connect the test leads as shown. Depress the mA- C-V-kf2-nS function switch. AT THE SAME TIME, depress both of the grey nS range switches. Insure that all other switches are at the out or OFF positions. Insure that the device being measured contains no electrical energy. TO AVOID ELECTRICAL SHOCK AND OR...

## The Peak Hold switch is a pushpush type Operate this switch by pushing to the right only Do not push or pull the switch

The peak hold function provides short term memory of the most positive dc or ac rms level (Figure 2-12). The peak hold function is intended to be used for voltage and current measurements. Proceed with the steps of operation for the measurement function being used with the peak hold function. When the test leads have been connected to the circuit to be measured, set the PEAK HOLD switch to ON. For a ne> y reading, set the PEAK HOLD switch to OFF then back to ON. To read negative peak...

## The Peakhold switch and Function switches are pushpush type Operate these switches by pushing to the RIGHT only Do not

Connect the test leads as shown above. Depress the grey switch beside the range desired (20V is shown selected). Set the AC DC switch out for DC or in For AC (DC is shown selected). Insure that all other switches are at the out or OFF positions. TO AVOID ELECTRICAL SHOCK AND OR INSTRUMENT DAMAGE, DO NOT CONNECT THE 8024A TERMINALS TO SOURCES THAT EXCEED THE FOLLOWING LIMITS WHEN MEASURING VOLTAGES COMMON 500V DC OR AC RMS WITH RESPECT TO EARTH GROUND. V-kS2-nS 1000V DC OR 750V AC RMS WITH...

## Theory of Operation

This section of the manual describes the theory of operation of your 8024A. The main features of your 8024A are presented first at an overall functional level. Then the operation of the a d converter and each function of your 8024A is described in more detail. A detailed schematic of your 8024A can be found in Section 7. 3-4. Figure 3-1 shows the major circuits of your 8024A arranged in a simplified functional block diagram. Input signals are routed by the range and function switches...

## To Avoid Electrical Shock Do Not Use The Thermocouple Accessories When Voltages Exceeding 30v Ac Rms Or 60v Dc Are

Figure 2-10 describes operation for the temperature measurement function with the thermocouple accessories and with the John Fluke Model 80T-150 Temperature Probe. To find the Fahrenheit equivalent of the C display, go to the Temperature Conversion portion of the Measurement Techniques material presented later in this section. Thermocouple connections must be made using approved isothermal connectors (such as the Y8104) and thermocouple wire that is the same type as the thermocouple....

## Warning

Select the kfl function and connect a short between the COMMON input terminal and the V kft nS input terminal. Then for each step in Table 4-2, select the range indicated and verify that the corresponding decimal point position and digit display in the table and the LCD are the same. 2. Select the DC V function, 2.0V range on the UUT. 3. Connect the equipment as shown in Figure 4-3. 4. Program the DMM Calibrator for a U.UTinput of-l.OVdcand verifythatthe - sign appears in the UUT display. 5....

## 610 Specifications Type K Chromel vs Alumel

Accuracy (With respect to NBS tables) +2.2 C (4 F) over the range of 0 C to 276.7 C (32 F to 530 F). 3 4 of temperature over the range of 276.7 C to 926.7 C (530 F to 1700 F). (Above accuracy and range specifications apply to thermocouple accessory only. Use 8024A Temperature function specifications when using the Y8102 accessory with the 8024A multimeter.) Time Constant 10 seconds (for air at room temperature and on atmosphere of pressure moving at 65 ft sec). Sampling Tip

## 636 Current Transformer 801600 637 Introduction

The Model 801-600 extends the ac Current measuring capability of the instrument up to a maximum of 600 amps. A clamp-on transformer designed into the probe allows measurements to be made without breaking the circuit under test. In use, the current carrying conductor being measured serves as the transformer's primary, while the 801-600 serves as the secondary. Because of a high efficiency, quadrature-type of winding, wire size and location of the conductor within the transformer jaws do...

## 433 Peak Hold Test

Use the following procedure to verify proper operation of the peak hold function 1. Select the AC V function, 2V range. 2. Connect the equipment as shown in Figure 4-3. 3. Program the DMM Calibrator for a UUT input of 1.9V ac rms at 100 Hz. Figure 4-4. General Equipment Connection - Current Table 4-4. Current Test Table 4-5. Resistance Conductance Test Table 4-5. Resistance Conductance Test 4. Push the PEAK HOLD switch to the ON position and verify that the UUT display is between 1.833...

## 247 Initial Checkout Procedure

Now that you have installed the battery, and know where everything is and how it works, let's make sure that the unit is working properly. We'll run through a simple checkout procedure starting with turn-on. No equipment other than test leads will be required. If a problem is encountered, please check battery, fuse, switch setting, and test lead connection before contacting your nearest John Fluke Service Center. This procedure is intended to verify overall instrument operation, and is...

## 236 Diode Testing

The 2 kfl, 200 kfl, and 20 Mil ranges of the kfl function will turn on PN junctions. Each of these ranges is marked with a diode symbol on the front panel of your 8024A. The preferred 2 kfl range has the largest symbol. The open circuit voltage is less than 3.5V on the 2 kfl range and less then 1.5V on all other ranges. When testing diodes in conjunction with the audio tone, use the 200 kfl range. The 200 1, 20 kil and 2000 kil ranges can be used for in-circuit resistance measurements.

## Schematic Diagrams

TABLE OF CONTENTS FIGURE TITLE PAGE j NOTES unless specified otherwise . j I. ALL RESISTOR VALUES RE IN OHMS. I 2. ALL CAPACITOR VALUES AWE IW MICROFARADS. I 5. LAST nESIONATOLS USEfi AJCt U21 , CR amp ,K77, Fl, C21, VR1, SIO, J7, aiO,W2, BTI, BTI, RV4-. I 4. E gt C I lt .NATO S NOT usen ARC RI,II I2,I3,I3 j 0L2,4,S, amp AEI Ull Oil, CRT. I I I I Manual Change and Backdating Information

## 327 Level Detector Circuit

As Figure 3-9 shows, when the kii or nS functions are selected, the DMM input is routed both to the resistance conductance signal conditioner and to the comparator of the level detector circuit. The other input to the comparator is a 0.8V reference level 200 kft range . When the DMM input is open circuited or greater than the reference, the level detector circuit causes the A up arrow to appear in the display. If the DMM input is less than the reference level, the level detector circuit...

## Do Not Substitute A Calculator Type Battery Eliminator For The A81 These Units Do Not Provide The Protection Necessary

The A81 Battery Eliminator replaces the output of the DMM battery to allow ac-line operation of the DMM. Select the correct A81 configuration according to the list below The BV indicator may come on when using the A8I. This does not adversely affect the operation of the 8024A. Hz U.S. type plug operation, use A81-230-1. Hz European type plug operation, use A81-230.

## 51 Introduction

This section contains an illustrated parts breakdown of the instrument. A similar parts listing for each of the Options will be found in Section 6. Components are listed alphanumerically by assembly. Both electrical and mechanical components are listed by reference designation. Each listed part is shown in an accompanying illustration. 5-3. Parts lists include the following information 4. Federal Supply Code for Manufacturers. See Table 5-6 for Code-to-Name list. 5. Manufacturer's Part...

## Chromel

Thermocouple Termination Unit Under high humidity conditions gt 80 conductance measurements may be in error. To ensure accurate measurement, connect clean test leads to the 8024A and with the leads open read the residual leakage in nanosiemens. Correct subsequent measurements by subtracting the residual from the readings. Fingerprints or other contamination on the pcb may also cause residual conductance readings. 2-79. Diode leakage Ir tests require that the diode junction be...

## 267 Applications

The test applications described in the following paragraphs are suggested useful extensions of the 8024A measurement capabilities. However, they are not intended as the j equivalent of manufacturer's recommended test methods. They are intended to provide repeatable and meaningful indications which will allow the operator to make sound j judgments concerning the condition of the device tested i.e. good, marginal, or defective. j Table 2-4. Voltage Current Capability of Resistance Ranges...

## 439 BT Test

Complete the following procedure to verify that the BT indicator appears on the LCD at the correct battery level, and that the accuracy of the U UT remains unaffected at this battery voltage level 1. Connect the equipment as shown in Figure 4-5. 2. Set the UUT switches to the following positions 3. Set the DMM controls to the following positions 4. Program the DMM Calibrator for a UUT input of 190.0 mV dc. 5. Adjust the variable power supply until the BT indicator appears in the UUT...

## 27 Battery or Fuse Installation Replacement

Youi 8024A is designed to operate on a single, inexpensive, 9V battery of the transistor radio calculator variety NEDA 1604 . When you receive your 8024A, the battery will not be installed in the DMM. Once the battery is installed, you can expect a typical operating life of up to 100 hours with an alkaline battery or 50 hours with a carbon-zinc battery. When the battery has exhausted about 80 of its useful life the BT indicator will appear in the upper left corner of the display. Your...

## 631 High Frequency Probe 82RF 632 Introduction

The Model 82RF High Frequency Probe allows measurements over a frequency range of 100 kHz to 500 M Hz from 0.25 to 30V rms. It is designed to be used with voltmeters having an input impedance of 10 megohms 10 . It may be used with a voltmeter having an input impedance higher than 10 megohms provided the input is externally shunted to make the equivalent input impedance equal to 10 megohms. 6-34. Circuitry within the 82RF consists of a capacitor-coupled rectifier circuit which responds to...

## 656 Deluxe Test Lead Set Y8134 657 Introduction

The Y8134 is a deluxe test lead set. The attachments provided allow interconnection with a wide variety of leads and electronic components. Included in the kit are 1. Two test leads one red and one black . The Y8134 leads have shrouded banana connectors on each end. 3. Two insulated alligator clips.

## 659 Slim Flex Test Lead Set Y8140 660 Introduction

The Y8140 Test Lead Set Figure 6-i consists of one red and one black 60-inch 1.52 meter test lead, each with a standard banana plug on one end and an extendable tip probe on the other end. This flexible metallic tip conductor may be extended up to 2-1 2 inches, and is insulated to within 1 10 of an inch of its tip. This insulation reduces the chance of creating an inadvertent short circuit while using the probes in their extended configuration. Intended primarily for measuring voltages,...

## List of Illustrations

Battery 2-3. Controls, Indicators, and Connectors 2-5. Abnormal Status Indicators 2-6. Volts 2-7. Current 2-8. Resistance 2-9. Conductance 2-10. Temperature 2-12. Peak Hold .2-13. Temperature Correction Factor For K-Type Thermocouples 2-21 2-14. Conductance-to-Resistance 2-15. Waveform 2-16. Voltage Measurement Error 2-17. Current Measurement 2-19. Thermocouple Termination 3-1. 8024A Block 3-2. A D Converter Functional 3-3. Integrate Capacitor 3-4. Voltage 3-5....