Tenma 72-7720 Operating Manual
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Tenma 72-7720 Operating Manual

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Table of Contents

Title
The Multimeter Structure
Functional Buttons
Display Symbols
A.
DC Voltage Measurement
B.
AC Voltage Measurement
C.
DC Current Measurement
E.
Measuring Resistance
F.
Model 72-7725:
G.
Model 72-7725:
I.
Measuring Diodes & Continuity
Model 72-7720/72-7725: OPERATING MANUAL
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Summary of Contents for Tenma 72-7720

  • Page 1: Table Of Contents

    Model 72-7720/72-7725: OPERATING MANUAL Table of Contents Page Title Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Multimeter Structure Functional Buttons Display Symbols Measurement Operation DC Voltage Measurement AC Voltage Measurement DC Current Measurement AC Current Measurement...
  • Page 2 Model 72-7720/72-7725: OPERATING MANUAL Title Page Resistance Test Model 72-7725: Frequency Model 72-7725: Temperature Capacitance Diodes and Continuity Test Maintenance General Service Replacing the Battery Replacing the Fuses...

  • Page 3: Overview

    Model 72-7720/72-7725: OPERATING MANUAL Overview Warning To avoid electric shock or personal injury, read the "Safety Information" and "Rules for Safe Operation" carefully before using the Meter. Digital Multimeters Model 72-720 and 72-7725 (hereafter referred to as “the Meter”) are 3 1/2 digits with steady operations, fashionable structure and highly reliable hand-held measuring instrument.

  • Page 4: Unpacking Inspection

    Model 72-7720/72-7725: OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter. Check the following items carefully for missing or damaged parts: Item Description 1 piece English Operating Manual 1 pair Test Lead 1 pair Test Clip...

  • Page 5: Safety Information

    Model 72-7720/72-7725: 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: Rules For Safe Operation

    Model 72-7720/72-7725: OPERATING MANUAL Rules For 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 72-7720/72-7725: OPERATING MANUAL Rules For Safe Operation (2) 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 .

  • Page 8: International Electrical Symbols

    Model 72-7720/72-7725: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). DC (Direct Current). AC or DC. Grounding. Double Insulated. Deficiency of Built-In Battery. Continuity Test. Diode. Capacitance Test. Fuse. Warning. Refer to the Operating Manual. Conforms to Standards of European Union.

  • Page 17: Ac Current Measurement

    Model 72-7720/72-7725: OPERATING MANUAL Measurement Operation(5) Insert the red test lead into the µAmA ( Model 72-7725) or 20A terminal and the black test lead into the COM terminal. 3. Set the rotary switch to an appropriate measurement position in A range.
  • Page 18 Turn off power to the circuit.Discharge all high-voltage capacitors. Insert the red test lead into theµAmA ( Model 72-7720) or mA ( Model 72-7725) or 20A terminal and the black test lead into the COM terminal. Set the rotary switch to an appropriate measurement position in A range.

  • Page 19: E. Measuring Resistance

    Model 72-7720/72-7725: OPERATING MANUAL Measurement Operation(7) E. Measuring Resistance (see figure 7) black ( figure 7) 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.

  • Page 20: Frequency Measurement

    Model 72-7720/72-7725: OPERATING MANUAL Measurement Operation(8) l For high resistance (>1MΩ), it is normal to take several seconds to obtain a stable reading. l When there is no input, for example in open circuit condition, the Meter displays “1”. l When resistance measurement has been completed, disconnect the connection between the testing leads and the circuit under test.

  • Page 21: Temperature Measurement

    Model 72-7720/72-7725: OPERATING MANUAL Measurement Operation(9) Note l When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test. G. Model 72-7725: Temperature Measurement (see figure 9) ( figure 9) Warning To avoid harm to you or damage to the Meter, do...

  • Page 22: Capacitance Measurement

    1. Insert the red test clip or red test lead into the VΩ terminal and the black test clip or black test lead into the µmA ( Model: 72-7720) or mA ( Model: 72-7725) terminal. 2. Set the rotary switch to an appropriate measurement position in Fcx range.

  • Page 23: I. Measuring Diodes & Continuity

    Model 72-7720/72-7725: OPERATING MANUAL Measurement Operation(11) Note l When testing polarited capacitors , connect the red test lead to anode & black test lead to cathode l If the capacitor is shorted or the capacitor value is overloaded, the LCD will display “1”.

  • Page 24: Testing For Continuity

    Model 72-7720/72-7725: OPERATING MANUAL Measurement Operation(12) Note l In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.8V; however; the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips.

  • Page 25: Sleep Mode

    Model 72-7720/72-7725: OPERATING MANUAL Sleep Mode Turning on the Auto Display Backlight The Meter has a built-in sensor. Therefore the Display Backlight turns on and off automatically depending on the brightness of the environment.

  • Page 26: General Specifications

    Model 72-7720/72-7725: OPERATING MANUAL General Specifications l Maximum voltage between Terminals and Ground : 1000V rms. Fused Protection for mA Input Terminal : 0.5A, 250V fast type, 5x20mm. Fused Protection for 20A Input Terminal : Un-fused. l Range : Manual ranging.

  • Page 27: Accuracy Specifications

    Model 72-7720/72-7725: OPERATING MANUAL Accuracy Specifications(1) Accuracy: (a% reading + b digits),guarantee for 1 year. Operating temperature:23 Relative humidity:<75%. Temperature coefficient: 0.1 x (specified accuracy) / 1 A. DC Voltage Accuracy Overload Range Resolution Protection 72-7720 72-7725 250VDCor 100µV 200mV ACrms.

  • Page 28: Dc Current

    Model 72-7720/72-7725: OPERATING MANUAL Accuracy Specifications(2) C. DC Current Accuracy Overload Range Resolution Protection 72-7720 727-7725 20µA 0.01µA 0.5A. 250V (0.8%+1) fast type 1µA fuse, 5x20 20mA 10µA (0.8%+1) 200mA (1.5%+1) 100µA Un-Fused 10mA (2%+5) Remarks: l At 20A Range: For continuous measurement 10 seconds and interval not less than 15 minutes.

  • Page 29: Resistance Test

    Model 72-7720/72-7725: OPERATING MANUAL Accuracy Specifications(3) E. Resistance Test Accuracy Overload Range Resolution Protection 72-7720 72-7725 200Ω (0.8%+3) 0.1Ω 2kΩ 1Ω 250V DC 20kΩ 10Ω (0.8%+1) or AC rms 200kΩ 100Ω 2MΩ 1kΩ (1%+2) 20MΩ 10kΩ 200MΩ 100kΩ [5%(reading-10)+10] Remarks: l Open circuit voltage: 700mV (At 200MΩ...

  • Page 30: Capacitance

    Model 72-7720/72-7725: OPERATING MANUAL Accuracy Specifications(4) H. Capacitance Accuracy Overload Range Resolution Protection 72-7720 72-7725 (4%+3) 10pF 20nF (4%+3) 250V AC 0.1nF 200nF (4%+3) 2µF (5%+4) 0.1µF 100µF Remarks:Testing signal:approx. 400Hz 40mV rms. µ When the tested capacitor is greater than 30 reading is for reference only.

  • Page 31: Maintenance

    Model 72-7720/72-7725: 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 32: Replacing The Fuses

    Model 72-7720/72-7725: OPERATING MANUAL Maintenance(2) Warning To avoid false readings, which could lead to possible electric shock or personal injury,replace the battery as soon as the battery indicator appears. To replace battery: Disconnect the connection between the test leads and the circuit under test, and move the test leads away from the input terminals of the Meter.
  • Page 33 Model 72-7720/72-7725: OPERATING MANUAL Model UT50A/B/C: OPERATING MANUAL Maintenance(3) Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket. 0.5A. 250V fast type fuse, φ 5x20mm. Rejoin the case bottom and the case top, and install the screw and rubber feet Replacement of fuses is seldom required.
  • Page 34 Model 72-7720/72-7725: OPERATING MANUAL Te n m a Te s t E q u i p m e n t 4 0 5 S . P i o n e e r B l v d . S p r i n g b o r o , O h i o 4 5 0 6 6...

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