APPA 93N User manual

DIGITAL MULTIMETER


INSTRUCTION MANUAL
APPA 93N

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WARNING
THE SERVICING INSTRUCTIONS DESCRIBED WITHIN THIS MANUAL 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. TO AVOID ELECTRIC SHOCK, DISCONNECT MEASURING TERMINALS BEFORE OPENING
ENCLOSURE.
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. Instruction 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 digit LCD readout (maximum reading 1999) with automatic
polarity, decimal point, overrange and low battery indicators.
2. Rotary Switch — Selects the desired function and range.
3. COM Input Terminal — Ground input connector.
4. VΩHz Input Terminal — Positive input connector for Volts, Ohms, Diode measurements.

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5. µA mA Input Terminal — Positive input connector for current measurements (up to 200mA).
6. 20A Input Terminal — Positive input connector for current measurements (up to 20A).
7. Capacitor Test Jacks — Used for capacitance measurements.
8. AC/DC Switch —Select AC or DC for voltage and current measurements.

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1
6
5 3
4
7
2
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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.
Overrange Indication : "1" or "-1".
Low Battery Indication : "" is displayed when the battery voltage drops below specified 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, IEC6F22.
Battery Life : 150 hours typical (Alkaline).

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Dimensions (WxHxD) : 84mm x 175mm x 31mm, without holster
95mm x 192mm x 50mm, 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 : 2000 meters.
Installation Category : IEC 1010 600V CAT. Ⅱ, 300V 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 Ambient : 0°C ~ 30°C ≦80% R.H., 30°C ~ 40°C ≦75% R.H., 40°C ~ 50°C ≦45% R.H.
Storage Temperature : -20°C to 60°C, with battery removed from meter.

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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)
2V 1mV
20V 10mV
200V 100mV
600V 1V
600V rms
Input Impedance : 10MΩ.

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(2) AC Volts
Range Resolution Accuracy Over voltage
protection
200mV 100 µV
±(1.3%rdg + 4dgt)
40Hz to 500Hz
2V 1mV
20V 10mV
200V 100mV
600V 1V
600V rms
AC Conversion Type : Average Sensing rms indication.
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 + 3dgt) 900mV max.
Overload Protection : 1A (500V) fast blow fuse for µAmA input.
16A(500V) fast blow fuse for 20A input.
* 20A Range : 30 seconds maximum above 10A.

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(4) AC Current
Range Resolution Accuracy Voltage Burden
200 µA 0.1 µA
±(1.5%rdg + 3dgt)
40Hz — 500Hz
600mV rms max.
2mA 1 µA
20mA 10 µA
200mA 100 µA
* 20A 10mA ±(2.5%rdg + 3dgt)
40Hz — 500Hz
900mV rms max.
AC Conversion Type : Average sensing rms indication.
Overload Protection : 1A (500V) fast blow fuse for µAmA input.
16A(500V) fast blow fuse for 20A input.
* 20A Range : 30 seconds maximum above 10A.

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(5) Resistance
Range Resolution Accuracy Max.Test
Current Max.Open Circuit Voltage
200Ω0.1Ω±(0.8%rdg + 4dgt) 2.5mA 3.2V
2KΩ1Ω
±(0.8%rdg + 1dgt)
200 µA
20KΩ10Ω40 µA
200KΩ100Ω4 µA
20MΩ10KΩ±(1.5%rdg + 5dgt) 40nA
0.5V
2MΩ1KΩ400nA
Overload Protection : 600V rms.

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(6) Diode Check
Range Resolution Accuracy Max.Test
Current Max.Open
Circuit volt-
age
1mV ±(1.5% rdg + 5 dgt) * 1.5mA 3.2V
* For 0.4V ~ 0.9V
Overload Protection : 600V rms.
Continuity : 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 after power on.
The meter can be turned back on by switching to another range.

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(8) Capacitance
Range Resolution Accuracy Test Frequency
2nF 1pF
40Hz
20nF 10pF
200nF 100pF
2 µF 1nF
200 µF 100nF
±(2.0%rdg + 4dgt)
20 µF 10nF

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(9) Frequency Counter
Range Resolution Accuracy
5Vrms Max Sensitivity Min. Input Frequency Overload Protection
2K Hz 1 Hz
±(1.0%rdg + 3dgt) 200m Vrms
min.
20 Hz
20K Hz 10 Hz 200 Hz
200K Hz 100 Hz 20K Hz
600V rms

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OPERATION
This instrument has been designed and tested in accordance with IEC Publication 1010, Safety Requirements for
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.
3-1 Preparation and Caution before Measurement
1. Before measurement, warm up for at least 30 seconds.
2. When the rotary function selector is changed during measurement, be sure to do so only after removing the test
leads from the equipment.
3. If the equipment is used near noise generating equipment, be aware that the display may become unstable or
indicate large errors.
4. Maximum rated voltage to earth for voltage and current measurements terminals is 600V AC/DC CAT II,
300V AC/DC CAT III.

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3-2 Voltage Measurements
1. Connect the red test lead to the “VΩHz” input terminal and other (black) test lead to the “COM” terminal.
1. Set the rotary function to the required position.
2. Set the DC/AC switch to the required position.
3. Connect black test lead to "COM" terminal and red test lead to the "VΩHz" input terminal.
4. Connect test leads to measuring points and read the displayed value.
5. "Warning : Do not exceed 600V rms limits stated in the specification".
WARNING : TO AVOID ELECTRIC SHOCK HAZARD, OR DAMAGE TO THE METER, DO NOT ATTEMPT
TO MEASURE VOLTAGES THAT MIGHT EXCEED 600 V rms. DO NOT APPLY MORE THAN
600V rms BETWEEN THE COMMON INPUT TERMINAL AND EARTH GROUND.

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3-3 Current Measurements
1. Set the rotary switch to the required position.
2. Set the DC/AC switch to the required position.
3. Connect black test lead to "COM" terminal.
4. Connect red test lead to "µA mA" terminal for measurements up to 200mA.
For measuring current between 200mA and 20A, connect red test lead to "20A" terminal.
5. Connect test leads to measuring points and read the displayed value.
3-4 Resistance Measurement
1. Set the rotary switch to the required position.
2. Connect black test leads to "COM" terminal and red test lead to "VΩHz" input terminal.
3. Connect test leads to measuring points and read the displayed value.

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3-5 Diode Check
1. Set the rotary switch to ";" position.
2. Connect the black test lead to the "COM" terminal and the red test lead to "VΩHz" input terminal.
3. Connect test leads to the diode. Normally the forward voltage drop of a good silicon diode is between
.500V to .900V. If the diode under test is defective, "000" (short circuit) or "1" (non-conductance) is displayed.
Reverse Check of Diode. If the diode under test is good "1" is displayed. If the diode under test is defective
"000" or other values are displayed.
3-6 Continuity Check by Sounder
1. Set the rotary switch to the " ;" position.
2. Connect the black test lead to the "COM" terminal and the red test lead to "VΩHz" input terminal.
3. Connect test leads to the circuit under test.
4. Built-in buzzer sounds if the resistance of the circuit under test is below 50Ω.