APPA 91 Operator's Manual
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APPA 91 Operator's Manual

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DIGITAL MULTIMETER
OPERATOR'S MANUAL
APPA 91

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  • Page 1 DIGITAL MULTIMETER OPERATOR’S MANUAL APPA 91...
  • Page 2 WARNING THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. Also, the complete duty cycle for the 20A measurement should be stated as on for 30 seconds max, and off for 3 minutes min.
  • Page 3 INTRODUCTION 1-1 Unpacking and Inspection Upon removing your new Digital Multimeter from its packing, you should have the following items: 1. Digital Multimeter. 2. Test lead set (one black, one red). 3. Operators Manual. 4. Protective holster. 1-2 Meter Safety Terms marked on Equipment ATTENTION —...
  • Page 4 Symbols in this Manual This symbol indicates where cautionary or other information is found in the manual. Fuse  Battery 1-3 Front Panel Refer to Figure 1 and the following numbered steps to familiarize yourself with the meter's front panel controls and connectors.
  • Page 5 Figure 1...

  • Page 6: Specifications

    SPECIFICATIONS 2-1 General Specifications Display : 3-1/2 digit Liquid Crystal Display (LCD) with a maximum reading of 1999. Polarity Indication : Automatic, positive implied, negative indicated. Zero Adjustment : Automatic. Overrange Indication : "1" or "-1". Low Battery Indication: "" is displayed when the battery voltage drops below operating voltage. Measuring Rate: 2.5 times per second, nominal.
  • Page 7 Dimensions (WxHxD) : 84mm x 175mm x 31mm, without holster 95mm x 192 mm x 50 mm, with holster. Weight (including battery) : 340 gms, without holster 550 gms, with holster. Accessories : Protective Holster, Battery (installed) and Instruction Manual. 2-2 Environmental Conditions: Indoor use.
  • Page 8 2-3 Electrical Specifications Accuracy is ± (% reading + number of digits) at 23°C ± 5°C, less than 75% R.H. (1) DC Volts Over voltage Range Resolution Accuracy protection 200mV 100 µV DC 500V / AC 350V ±(0.5%rdg + 1dgt) 10mV DC 1200V AC 850V...
  • Page 9 (2) AC Volts Over voltage Range Resolution Accuracy protection 200mV 100 µV DC 500V / AC 350V ±(1.25%rdg + 4dgt) 10mV DC 1200V 40Hz — 500Hz AC 850V 200V 100mV 750V Input Impedance : 10MΩ, less than 100pF...
  • Page 10 (3) DC Current Range Resolution Accuracy Voltage Burden 200 µA 0.1 µA 1 µA 600mV max. ±(1.0% rdg + 1dgt) 20mA 10 µA 200mA 100 µA 900mV max. 10mA ±(2.0%rdg + 3 dgt) * 20A Range : 30 seconds maximum above 10A. Overload Protection : 1A/500V fast blow fuse for mA, µA input.
  • Page 11 (4) AC Current Range Resolution Accuracy Voltage Burden 200 µA 0.1 µA 600mV rms max. 1 µA ±(1.5% rdg + 3 dgt) 40Hz — 500Hz 20mA 10 µA 200mA 100 µA 900mV rms max. ±(2.5% rdg + 3 dgt) 10mA 40Hz —...
  • Page 12 (5) Resistance Max.Test Max.Open Range Resolution Accuracy Current Circuit Voltage ±(0.75% rdg + 4 dgt) 2.5mA 3.2V 200Ω 0.1Ω 200 µA 2KΩ 1Ω 20KΩ 10Ω 40 µA ±(0.75% rdg + 1 dgt) 4 µA 200KΩ 100Ω 0.5V 2MΩ 1KΩ 400nA 20MΩ...
  • Page 13 (6) Diode Check Max.Test Max.Open Range Resolution Accuracy Current Circuit voltage  ±(1.5% rdg+ 5 dgt) 1.5mA 3.2V * Overload Protection: 500V d.c/a.c max. Instant Continuity Description: Built – in buzzer sound when resistance is less than 50Ω. (7) Auto Power Off: The meter will automatically shut itself off after approximately 30 minutes when the rotary switch is not changed.

  • Page 14: Operation

    OPERATION This instrument has been designed and tested in accordance with IEC Publication 1010, Safety Requirements of Electronic Measuring Apparatus and has been supplied in a safe condition. This instruction manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in safe condition.
  • Page 15 3-2 Voltage Measurements 1. Set the rotary switch at the required position. 2. Connect black test lead to "COM" terminal and red lead to "VΩ " input terminal. 3. Connect test leads to measuring points and read the display value. 3-3 Current Measurements 1.
  • Page 16 3-4 Resistance Measurement 1. Set the rotary switch to the required position. 2. Connect black test lead to "COM" terminal and read lead to "VΩ " input terminal. 3. Connect test leads to measuring points and read the display value. 3-5 Diode Check ...

  • Page 17: Maintenance

    3-6 Continuity Check by sounder  1. Set the rotary switch at the " " position. 2. Connect the black test lead to "COM" terminal and the red test lead to "VΩ " input terminal. 3. Connect test leads to the circuit under test. 4.

  • Page 18: Battery Installation Or Replacement

    4-2 BATTERY INSTALLATION OR REPLACEMENT The meter is powered by a single 9V battery. Refer to Figure 2A and use the following procedure to replace the battery: 1. Disconnect the test leads and turn the meter off. Remove the test leads from the front terminals. 2.

  • Page 19: Fuse Replacement

    4-3 FUSE REPLACEMENT Refer to Figure 2B and use the following procedure to examine or replace the meter's fuse: 1. Perform steps 1 through 3 of the battery replacement procedure. 2. Lift the circuit board from the case top. Do not remove the screws from the circuit board. 3.
  • Page 20 Battery Replacement Case Bottom Fuse 2 9V Battery Case Top Battery Connector Fuse 1 Figure 2A Figure 2B...
  • Page 21 HOW TO USE THE PROBE HOLDER Clip one probe on the holster for Wrap the leads around the one handed meter operation. holster to store the test probes.
  • Page 22 HOW TO USE THE TILT STAND AND HOLSTER Swing the stand out for easier meter reading. Swing the upper holder out and hook it over a door.
  • Page 23 HOW TO USE THE TILT STAND AND HOLSTER Meter in holster face down. Hang on a nail at the workbench...
  • Page 24 APPA TECHNOLOGY CORP. 9F.119-1 Pao-Zong Rd., Shin-Tien, Taipai, 23115, Taiwan, R.O.C. P.O.Box. 12-24 Shin-Tien, Taiwan. Tel : 886-2-29178820 Fax : 886-2-29170848 E-MAIL:info @appatech.com http://www.appatech.com Printed In Taiwan Copright 2001, APPA Tech., Corp. All rights reserved.

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