APPA 91 User manual

DIGITAL MULTIMETER


OPERATOR’S MANUAL
APPA 91

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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.

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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 — Refer to Manual.
DOUBLE INSULATION — Protection Class II.
DANGER — Risk of electric shock

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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.
1. Digital Display — The digital display has a 3-1/2 LCD readout (maximum reading 1999) with automatic polarity,
overrange and low battery indicators.
2. Rotary Switch — Select the Function and Range desired.
3. COM Input Terminal — Ground input connector.
4. V Ω:Input Terminal — Positive input connector for Volts, Ohms and Diode.
5. mA µA Input Terminal — Positive input connector for mA and µA measurements (up to 200mA).
6. 20A Input Terminal — Positive input connector for Amp measurements (up to 20A).

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1 2 4 3 5 6
Figure 1

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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.
Auto Power Off: Approx. 30 minutes.
Temperature Coefficient : 0.15 x (Specified accuracy) / °C, <18°C or >28°C.
Power Requirements : Standard 9V battery, NEDA 1604, JIS 006P, IEC 6LF22.
Battery Life : Alkaline 300 hours.

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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.
Maximum Altitude : 2000m
Installation Category : IEC 1010 CAT .Ⅱ. 1000V, 600V CAT .Ⅲ.
CAT.Ⅱis for measurements performed on circuits directly connected to the low-voltage installation.
CAT .Ⅲ. is for measurements per formed in the building installation.
Pollution Degree : 2
Operating Temperature : 0°C to 45°C (below 75% R.H.)
Storage Temperature : -20°C to 60°C (below 80%R.H.)

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2-3 Electrical Specifications
Accuracy is ± (% reading + number of digits) at 23°C ± 5°C, less than 75% R.H.
(1) DC Volts
Range Resolution Accuracy Over voltage
protection
200mV 100 µV
±(0.5%rdg + 1dgt)
DC 500V / AC 350V
2V 1mV
20V 10mV
200V 100mV
1000V 1V
DC 1200V
AC 850V
Input Impedance : 10MΩ.

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(2) AC Volts
Range Resolution Accuracy Over voltage
protection
200mV 100 µV
±(1.25%rdg + 4dgt)
40Hz — 500Hz
DC 500V / AC 350V
2V 1mV
20V 10mV
200V 100mV
750V 1V
DC 1200V
AC 850V
Input Impedance : 10MΩ, less than 100pF

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(3) DC Current
Range Resolution Accuracy Voltage Burden
200 µA 0.1 µA
±(1.0% rdg + 1dgt) 600mV max.
2mA 1 µA
20mA 10 µA
200mA 100 µA
20A 10mA ±(2.0%rdg + 3 dgt) 900mV max.
* 20A Range : 30 seconds maximum above 10A.
Overload Protection : 1A/500V fast blow fuse for mA, µA input.
16A/500V fast blow fuse for 20A input.