Tenma 72-7930 Operating Manual
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Tenma 72-7930 Operating Manual

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Model 72-7930: OPERATING MANUAL
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  • Page 1: Table Of Contents

    Model 72-7930: OPERATING MANUAL Table of Contents Title Page Overview Inspection Safety Information Safe Operation International Electrical Symbols The Meter Structure Rotary Switch Positions Functional Button Operation Display Symbols Measurement Operation A. DC and AC Voltage Measurement B. DC and AC Current Measurement C.

  • Page 2: Title Page

    Model 72-7930: OPERATING MANUAL Title Page K. Frequency Maintenance A. General Services B. Replacing the Fuses C. Replacing the Battery...

  • Page 3: Overview

    To avoid risk of injury from electric shock, read the “Safety Information” and “Rules For Safe Operation” carefully before using the meter. The Digital Multimeter Model 72-7930 (hereafter referred to as The Meter) is a highly reliable handheld measuring instrument featuring an extra large LCD 3-1/2 digit display and full range overload protection.

  • Page 4: Inspection

    Model 72-7930: OPERATING MANUAL Inspection This meter includes the following items: Item Description Operating Manual 1 piece Test Leads 1 pair Multi-Purpose Socket 1 piece Point Contact Temperature Probe 1 piece 9V Battery (NEDA 1604, 6F22 or 009P) 1 piece In the event items are missing or damaged, please contact your dealer immediately.

  • Page 5: Safety Information

    Model 72-7930: OPERATING MANUAL Safety Information This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 1000V, CAT. III 600V) and double insulation. CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT.

  • Page 6: Safe Operation

    Model 72-7930: OPERATING MANUAL Safe Operation (1) Warning To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules: l Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed.
  • Page 7 Model 72-7930: OPERATING MANUAL Safe Operation (2) l When using the test leads, keep your fingers behind the finger guards. l Disconnect circuit power and discharge all high -voltage capacitors before testing resistance, continuity, diodes, capacitance or current. l Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit.

  • Page 8: International Electrical Symbols

    Model 72-7930: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). DC (Direct Current). Ground. Double Insulated. Low Battery. Warning. Refer to the Operating Manual. Conforms to Standards of European Union.
  • Page 13 Model 72-7930: OPERATING MANUAL Symbol Meaning Ω,kΩ,MΩ mV, V µF nF µA, mA, A Fahrenheit temperature...

  • Page 14: Measurement Operation

    Model 72-7930: OPERATING MANUAL Measurement Operation(1) A.DC and AC Voltage Measurement (see figure 3) black (figure 3) Warning To avoid harm to you or damage to the Meter from electric shock, please do not attempt to measure voltages higher than 1000V although readings may be obtained.

  • Page 15: Dc And Ac Current Measurement

    Model 72-7930: OPERATING MANUAL Measurement Operation(2) black (figure 4) Warning Never attempt an in-circuit current measurement where the open circuit voltage between terminals and ground is greater than 250V . If the fuse burns out during measurement, the Meter may be damaged or the operator may be injured.
  • Page 16 Model 72-7930: OPERATING MANUAL Measurement Operation(3) Use proper terminals, function, and range for the measurement. When the test leads are connected to the current terminals, do not parallel them across any circuit. The DC Current ranges are:2mA, 200mA, 20A The AC Current ranges are: 2mA, 200mA and 20A To measure current, do the following: 1.

  • Page 17: Measuring Resistance

    Model 72-7930: OPERATING MANUAL Measurement Operation(4) black (figure 4) Warning To avoid damage to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. The resistance ranges are:200Ω, 2kΩ, 20kΩ, 2MΩ...
  • Page 18 Model 72-7930: OPERATING MANUAL Note l The test leads can add 0.1to 0.2Ω of error to the resistance measurement. To obtain accurate readings in low-resistance, short-circuit the input terminals beforehand and record the reading obtained (called this reading as X). (X) is the additional resistance from the test lead.

  • Page 19: Measuring Diodes

    Model 72-7930: OPERATING MANUAL Warning To avoid damage to the Meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring diodes. To avoid personal injury, please do not attempt to input voltages higher than 60V DC or 30V rms AC.

  • Page 20: Testing For Continuity

    Model 72-7930: OPERATING MANUAL Measurement Operation(7) l The open-circuit voltage is around 3V. l When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test. black (figure 7) Warning To avoid personal injury, please do not attempt to input voltages higher than 60V DC or 30V rms AC.

  • Page 21: Capacitance Measurement

    Model 72-7930: OPERATING MANUAL To avoid personal injury,...

  • Page 22: Temperature Measurement

    Model 72-7930: OPERATING MANUAL value above 10 F. To avoid personal injury or damage to the meter, To ensure the highest level of accuracy, the ambient temperature of the meter case should be between 64-74 F. This is especially true with low temperature...

  • Page 23: Measuring Transistors

    Model 72-7930: OPERATING MANUAL To avoid personal injury, and mA...

  • Page 24: Frequency Measurement

    Model 72-7930: OPERATING MANUAL POWER...

  • Page 25: Operation Of Hold Mode

    Model 72-7930: OPERATING MANUAL...

  • Page 26: General Specifications

    Model 72-7930: OPERATING MANUAL General Specifications Maximum Voltage or Current between input Terminals and Ground: According to different functional input protection value. Fused Protection for l AmA Input Terminal : 0.5A, 250V fast type, 5x20mm. l Maximum Display : 1999,updates 2~3 times/ second.

  • Page 27: Accuracy Specifications

    Model 72-7930: OPERATING MANUAL Accuracy Specifications(1) Accuracy specifications are guaranteed one year. Operating temperature:18 C~28 Relative humidity: 75%RH. A. DC Voltage Overload Accuracy Range Resolution Protection 250VAC 200mV 0.1mV (0.5%+1) 10mV 1000V AC 200V 100mV 1000V (0.8%+2) Remarks:Input Impedance: approx.10MΩ.

  • Page 28: Dc Current

    Model 72-7930: OPERATING MANUAL Accuracy Specifications(2) C. DC Current Overload Accuracy Range Resolution Protection (0.8%+1) 1µA Fuse 0.5A, 250V, fast type, 5x20mm 0.1mA (1.5%+1) 200mA 10mA Un-Fused (2%+5) Remarks: l At 20A Range: For continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes.

  • Page 29: Resistance Test

    Model 72-7930: OPERATING MANUAL...

  • Page 30: Capacitance

    Model 72-7930: OPERATING MANUAL Accuracy Specifications(4) H. Capacitance Accuracy Range Resolution (4.0%+3) 200nF 0.1nF ±(5.0%+4) 100µF 0.1µF When it is 40µF: the obtained reading is only for reference Temperature Accuracy Range Resolution 0~400 (1%+3)

  • Page 31: Transistor Test

    Model 72-7930: OPERATING MANUAL Accuracy Specifications(5) J. Transistor test Range Resolution Accuracy±(a% reading + b digits) 1β Vce•3V Ibo•10µA 1000βMAX K. Frequency Overload Accuracy Range Resolution Protection 2kHz ±(1.5%+5) 250V AC 20kHz 10Hz...

  • Page 32: Maintenance

    Model 72-7930: OPERATING MANUAL Maintenance(1) This section provides basic maintenance information including battery and fuse replacement instruction. Warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information.

  • Page 33: C. Replacing The Battery

    Model 72-7930: OPERATING MANUAL Maintenance(2) To replace the Meter’s fuse: 1. Turn the Meter off and remove all connections from the terminals. 2. Remove the holster from the Meter. 3. Remove the 3 screws from the case bottom, and separate the case top from the case bottom.
  • Page 34 Model 72-7930: OPERATING MANUAL ** END ** This operating manual is subject to change without notice.
  • Page 35 Model 72-7930: OPERATING MANUAL...
  • Page 36 Model 72-7930: OPERATING MANUAL Copyright 2005 Tenma Test Equipment. All rights reserved. Tenma Test Equipment 405 S. Pioneer Blvd. Springboro,Ohio 45066 www.tenma.com...

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