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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. VΩ Hz 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
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 : "
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).
" is displayed when the battery voltage drops below specified operating voltage.
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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.
CAT.Ⅱ is 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.
Ⅲ
.
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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
200mV 100 µV
2V 1mV
20V 10mV
±(0.5%rdg + 1dgt)
200V 100mV
600V 1V
Input Impedance : 10MΩ.
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Over voltage
protection
600V rms
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(2) AC Volts
Range Resolution Accuracy
200mV 100 µV
2V 1mV
20V 10mV
200V 100mV
600V 1V
AC Conversion Type : Average Sensing rms indication.
Input Impedance : 10MΩ// less than 100pF
±(1.3%rdg + 4dgt)
40Hz to 500Hz
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Over voltage
protection
600V rms
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(3) DC Current
Range Resolution Accuracy Voltage Burden
200 µA 0.1 µA
2mA 1 µA
20mA 10 µA
±(1.0%rdg + 1dgt)
200mA 100 µA
* 20A 10mA ±(2.0%rdg + 3dgt)
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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600mV max.
900mV max.
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(4) AC Current
Range Resolution Accuracy Voltage Burden
200 µA 0.1 µA
2mA 1 µA
20mA 10 µA
200mA 100 µA
* 20A 10mA
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.
±(1.5%rdg + 3dgt)
40Hz — 500Hz
±(2.5%rdg + 3dgt)
40Hz — 500Hz
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600mV rms max.
900mV rms max.
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(5) Resistance
Range Resolution Accuracy
200Ω 0.1Ω
2KΩ
20KΩ
200KΩ
1Ω
10Ω
100Ω
2MΩ 1KΩ
20MΩ 10KΩ
Overload Protection : 600V rms.
Max.Test
Current
Max.Open
Circuit Voltage
±(0.8%rdg + 4dgt) 2.5mA 3.2V
200 µA
40 µA
±(0.8%rdg + 1dgt)
4 µA
0.5V
400nA
±(1.5%rdg + 5dgt) 40nA
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(6) Diode Check
Range Resolution Accuracy
Max.Test
Current
Max.Open
Circuit volt-
age
* 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.
1mV ±(1.5% rdg + 5 dgt) * 1.5mA 3.2V
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(8) Capacitance
Range Resolution Accuracy Test Frequency
2nF 1pF
20nF 10pF
200nF 100pF
2 µF 1nF
20 µF 10nF
200 µF 100nF
±(2.0%rdg + 4dgt)
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40Hz
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(9) Frequency Counter
Range Resolution
Accuracy
5Vrms Max
Sensitivity
2K Hz 1 Hz
20K Hz 10 Hz 200 Hz
±(1.0%rdg + 3dgt)
200m Vrms
min.
Min. Input
Frequency
20 Hz
200K Hz 100 Hz 20K Hz
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Overload
Protection
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.
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3-7 Capacitance Measurement
1. Set the rotary switch to the required position.
2. Observe polarity when measuring polarized capacitors.
3. The tested capacitor should be discharged before the testing procedure. Never apply voltage to the “Capacitor
Test jacks” Serious damage may result.
4. Insert the capacitor into "" jacks and read the displayed value.
3-8 Frequency Measurement
1. Set the rotary switch to the required position.
2. Connect black test lead 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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MAINTENANCE
WARNING : TO AVOID ELECTRICAL SHOCK REMOVE TEST LEADS BEFORE OPENING THE COVER.
4-1 General Maintenance
To keep the instrument clean, wipe the case with a damp cloth and detergent, do not use abrasives or solvents.
Any adjustment, maintenance and repair of the opened instrument with voltage present shall be avoided as far as
possible and, if inevitable, shall be carried out by a skilled person who is aware of the hazard involved.
Whenever it is likely that the protection has been impaired, the instrument shall be made inoperative and be
secured against any unintended operation.
The protection is likely to be impaired if, for example, the apparatus:
— shows visible damage,
— fails to perform the intended measurements,
— has been subjected to prolonged storage under unfavorable conditions,
— has been subjected to severe transport stresses.
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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 switch the meter off. Remove the test leads from the front terminals.
2. Remove the holster.
3. Position the meter face down. Remove the three screws from the case bottom.
4. Lift the end of the case bottom until it gently unsnaps from the case top at the end nearest the LCD.
5. Lift the battery from the case top, and carefully disconnect the battery from battery connector leads.
6. Snap the battery connector to the terminals of a new battery and reinsert the battery into the case top.
Make sure that the battery leads do not become pinched between the case bottom and case top.
7. Replace the case top and case bottom. Reinstall the three screws and replace the holster.
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4-3 Fuse Replacement
Refer to Figure 2B and use the following procedure to examine or replace the meter's fuses:
1. Perform steps 1 through 4 of the battery replacement procedure.
2. Lift the circuit board from the case top. Do not remove the screws from the circuit board.
3. Remove the defective fuse by gently lifting one end of the fuse loose and sliding the fuse out of the fuse holder.
4. Install a new fuse of the same size and rating. Make sure the new fuse is centered in the fuse holder.
5. Make sure that the case top rotary switch and the circuit board switch both are in the OFF position.
6. Replace the case top and case bottom. Make sure that the O-rings of case screws are properly seated, the
battery leads do not become pinched between the case halves, and the two snaps on the case top are engaged.
Reinstall the three screws.
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Battery and Fuse Replacement
Case Bottom
Fuse 2
Case Top
9V Battery
Case Top
Battery Connector
Fuse 1
Figure 2A Figure 2B
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Case Bottom
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HOW TO USE THE PROBE HOLDER
Clip one probe on the holster for
one handed meter operation.
Wrap the leads around the
holster to store the test probes.
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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.
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HOW TO USE THE TILT STAND AND HOLSTER
Meter in holster face down. Hang on a nail at the workbench
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Tel : 886-2-29178820 Fax : 886-2-29170848
Copright 1997, APPA Tech., Corp. All rights reserved.
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.
E-MAIL:info @appatech.com
http://www.appatech.com
Printed In Taiwan
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