APPA 97II Instruction Manual

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DIGITAL MULTIMETER

6

INSTRUCTION MANUAL

APPA 97II

1

#

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.

2

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 as Marked on Equipment.
# ATTENTION — Refer to manual.

1 DOUBLE INSULATION — Protection Class Ⅱ.

" DANGER — Risk of electric shock.

3

Symbols in this Manual.
# This symbol indicates where cautionary or other information is found in the manual.
FUSE

Battery

1-2 Front Panel

Refer to Figure 1 and to the following numbered steps to familiarize yourself with the meter’s front panel controls
And connectors.

1. Digital Display — The digital display has a 3400 counts LCD readout with 70 segments analog bar graph, auto
polarity, decimal point, “ “ AC, DC RANGE, HOLD APO and unit annunciators.

2. Rotary Switch — Select the Function and Range desired.

3. COM Input Terminal — Ground input connector.

4. VΩ Hz Input Terminal — Positive input connector for Volts, Ohms and Frequency.

5. mA Input Terminal — Positive input connector for Amp measurements (up to 340mA).

6. A Input Terminal — Positive input connector for Amp measurements (up to 10A).

4

7. Range Switch, (Manual Range) — “Range” switch is pressed to select manual ranging and to change ranges.
When “Range” switch is pressed “RANGE” annunciator on the LCD
appears. Press “RANGE” switch to select appropriate range to be used.
Press “RANGE” switch and hold for 2 seconds to return to Autoranging.

8. Blue Switch — Press the switch to measure AC Voltage / Current or DC Voltage/Current in the Voltage /
Current mode, or to measure Resistance or continuity or diode in Ω / / mode.

9. Hold Switch — This switch is used to hold a measured value for all functions, when pressed the “HOLD”
annunciator is displayed. Conversions are made but the display is not updated.

10. % Hz Switch — This switch is used to quickly view the frequency during measurement of the AC voltage or
current. Press “ % Hz “ switch so that the LCD is changed to display frequency. Press
“ % Hz “ switch again, the LCD reverts back to display the AC signal amplitude reading. In
“ % Hz “ mode, pressing RANGE switch does not change the frequency range.
However the RANGE key switch changes the sensitivity of frequency detection, if the input
signal amplitude is less than 1% of full scale reading, the user shall increase the sensitivity.
Pressing the Range switch in “ % Hz “ mode also changes the full scale range of the original
voltage or current mode.

5

Figure 1

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SPECIFICATIONS

2-1 General Specifications
Display : The Liquid Crystal Display (LCD) with a maximum reading of 3400 and 70 segments bar graph.

Polarity Indication : Automatic, positive implied, negative indicated.
Overrange Indication : “OL” or “-OL”.

Low Battery Indication : “ “ is displayed when the battery voltage drops below operating voltage.
Sampling : 2 times/sec for digit. 12 times/sec for analog bargraph.

Auto Power Off : Approx 10 minutes.
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 , 0 to 80% R.H. when battery removed from meter.
Temperature Coefficient : 0.15 x (Specified accuracy) / °C , <18°C or > 28°C .
Power Requirements : IEC LR03, AM4 or AAA size 1.5V x 2.
Battery Life : Alkaline 500 hours.

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Dimensions (W x H x D) : 88mm x 180mm x 33.5mm , without holster.
94mm x 188mm x 40mm , with holster.

Accessories : Protective Holster , batteries (installed), operators manual, test lead set.

2-2 Environmental Conditions
Indoor use.

Maximum Altitude : 2000 Meter.
Installation Category : IEC 1010, 1000V Cat.Ⅱ, 600V Cat.Ⅲ.

Pollution Degree : 2.

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2-2 Electrical Specifications

Accuracy is ± (% reading + number of digits) at 23°C ± 5°C at less than 80% R.H.

(1) DC Volts

Range Resolution Accuracy

Over voltage

protection

±(0.25% reading + 1digit)* DC 1000V

300mV 100µV

3V 1mV
30V 10mV
300V 100mV

1000V 1V

Input Impedance : 10MΩ . (over 1000MΩ in 300mV range).
* ±(0.4% reading + 1 digit) in 3V range.

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(2) AC Volts

Range Resolution Accuracy

Over voltage

protection

±(1.3% reading + 5 digits)*

750V rms

±(1.3% reading + 5 digits)

40Hz to 1KHz

3V 1mV

30V 10mV
300V 100mV
750V 1V

* Frequency Response : 40Hz ~ 500Hz for 3V Range.
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

±(1.5% reading + 2 digits) 200mV max
±(1.5% reading + 2 digits) 2V max
±(2.0% reading + 2 digits) 2V max

30mA 10µA

300mA 0.1mA

10A 10mA

Overload Protection : 1A (500V) fast blow fuse 10KA breaking capacity @440Vac for mA input.
Size = 32mm x 6.3mm
10A (500V) fast blow fuse 10KA breaking capacity @440Vac for A input.
Size = 32mm x 6.3mm

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(4) AC Current

Range Resolution Accuracy Voltage Burden

±(2.0% reading + 5 digits)

200mV max

2V max

±(2.5% reading + 5 digits) 2V max

30mA 10µA

300mA 0.1mA

* 10A 10mA

* Frequency Response : 40Hz ~ 1KHz.
Overload Protection : 1A (500V) fast blow fuse 10KA breaking capacity @440Vac for mA input.

Size = 32mm x 6.3mm
10A (500V) fast blow fuse 10KA breaking capacity @440Vac for A input.
Size = 32mm x 6.3mm
* AC Conversion Type : Average Sensing rms indication.

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(5) Resistance

Range Resolution Accuracy

Overload

Protection

±(1.0% reading + 4 digits)

600V rms

±(0.7% reading +3 digits)

±(1.0% reading + 3 digits)

±(2.0% reading + 5digits)

300Ω

0.1Ω
3KΩ 1Ω
30KΩ 10Ω
300KΩ 100Ω

3MΩ 1KΩ

30MΩ 10KΩ

Open circuit Voltage : -1.5V approx.

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(6) Diode Check and Continuity

Range Resolution Accuracy

Max. Test

Current

Max. Open

Circuit

Voltage

1mV

±(1.5% reading + 5 digits)*

1.5mA 3V

* For 0.4V ~ 0.8V.
Overload Protection : 600V rms max.

Continuity : Built-in buzzer sound when resistance is less than 30Ω approximately.

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(7) Frequency / RPM

Range Resolution Sensitivity Accuracy

Overload

Protection

3.0KHz/30KRPM 1Hz/30RPM
Frequency :

0.01% ± 1 digit

RPM :

0.01% ± 10 digits

600V rms

30KHz/300KRPM 10Hz/300RPM
300KHz/3MRPM 100Hz/3KRPM
3MHz/30MRPM 1KHz/30KRPM
30MHz/300MRPM 10KHz/300KRPM 250mV rms

100mV rms

* Less than 20Hz the sensitivity is 1.5V rms.

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(8) Auto Power Off (APO)

The APO sign on the LCD panel indicates the meter is working in the Auto Power Off mode. If the meter idles
for more than 10 minutes, the meter automatically turns the power off. When this happens, the reading is
saved. The meter can be turned back on by pushing any switch or changing the rotary mode. If the meter is
repowered like this the LCD displays the saved reading, press the Hold switch to disable the hold state. The
meter will give a series of alarm as automatically turns power off by itself 15 seconds before, you can reset the
time of Auto-Power-Off by pressing switch or rotates the rotary switch.

(9) Disable Auto Power Off

To disable the auto power off function, press any of the switches (other than HOLD or the BLUE switch) whilst
powering the meter up.

(10) %Hz sensitivity
The sensitivity in the %Hz mode is 1/10 of full scale range.
The accuracy is same as Frequency mode. The measuring frequency is from 40Hz up to 1KHz.

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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 60 seconds.

2. When the rotary function selector is changed during measurement, be sure do so only after removing the test
leads from the equipment.

3. If the equipment is used near noise generating equipment, be aware that may become unstable or indicate
large errors.

4. # Maximum rated voltage to earth for voltage and current measurements terminals is 1000V CAT.Ⅱ, 600V
CAT. Ⅲ .

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3-2 Voltage Measurements

1. Connect the red test lead to the “VΩHz” input terminal and the other (black) test lead to the “COM” terminal.

2. Set the rotary function to the V position.

3. Measurement of AC voltage can be performed by pressing the “BLUE” switch.

#

WARNING

TO AVOID ELECTRICAL SHOCK, HAZARD OR DAMAGE TO METER, DO NOT A ATTEMPT TO
MEASURE VOLTAGES THAT MIGHT EXCEED 1000V ms. DO NOT APPLY MORE THAN 1000V rms
BETWEEN THE COMMON INPUT TERMINAL AND EARTH GROUND.

NOTICE

UNSTABLE DISPLAY MAY OCCUR ESPECIALLY AT 300mV RANGE, EVEN THOUGH YOU HAVE
NOT PUT TEST LEADS INTO INPUT TERMINALS. IN THIS CASE, IF AN ERRONEOUS READING IS

SUSPECTED, SHORT THE “VΩHz” TERMINAL AND THE “COM” TERMINAL, AND MAKE SURE
THE DISPLAY READS ZERO.

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3-3 Current Measurement

1. Connect the red test lead to “mA” terminal and the other (black) test lead to “COM” terminal, or use the “A” and
“COM” terminal in the 10A range.

2. Set function selector rotary switch to “mA” or “A” correspondingly.

3. Measurement of AC current can be performed by pushing the “BLUE” switch.

4. Connect the test leads to the circuit to be measured.

3-4 Resistance Measurement

1. Connect the red test lead to the “VΩHz” terminal and the other (black) test lead to the “COM” terminal.

2. Set the rotary function selector to “Ω” position to measure the resistance.

3. For correct reading, ensure that the device being tested contains no voltage.

4. Connect the test leads across the resistor to be measured. In order to ensure the best accuracy in measure­ ment of low resistance, short the test leads before measurement and note the test probe resistance, then
subtract this value from subsequent circuit resistance measurements.

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3-5 Continuity Check by Buzzer

1. Connect the red test lead to the “VΩHz” terminal and the other (black) test lead to the “COM” terminal.

2. Set the rotary function selector to “Ω : ” position.

3. Connect the test leads to the circuit to be measured. The buzzer will sound if the resistance of the circuit
measured is lower than 30Ω approximately.

3-6 Diode Check

1. Set the rotary switch at “Ω : ” position.

2. Connect black test lead to “COM” terminal and red lead to “ VΩHz ” input terminal.

3. Connect test leads to the diode. Normally the forward voltage drop of good silicon diode is shown between.

0.400V to 0.900V. If the diode under test is defective, “000” (short circuit) or “OL” (non-conductance) is
displayed. During reverse checking the diode is normal if “OL” is displayed, “000” or other values are displayed
if it is defective.

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3-7 Hz / RPM Measurement

1. Connect the red test lead to the “VΩHz” terminal and the other (black) test lead to the “COM” terminal.

2. Set the rotary function selector to “Hz RPM” position to measure the frequency or RPM.

3. Connect the test leads to the circuit to be measured.

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MAINTENANCE

#

WARNING : TO AVOID ELECTRICAL SHOCK REMOVE TEST LEAD BEFORE OPENING THE COVER.

4-1 General Maintenance

1. Repairs or servicing not covered in this manual should only be performed by qualified personal.

2. Periodically wipe the case with a dry cloth and detergent do not use abrasives or solvents.

4-2 Battery Installation or Replacement

The meter is powered by two 1.5V battery. Refer to Figure 2 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. Position the meter face down. Unscrew the self-retaining battery cover screw (i) .

3. Lift the edge of the battery cover gently (ii) until it unsnaps from the meter case.

4. Lift the battery box (iii) from the meter case and remove the 2 x AAA batteries.

5. Fit new batteries into the battery box, observing correct polarity. Place the battery box back into the meter case.

6. Replace the battery cover, making sure that battery leads do not become pinched.

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Figure 2

1.5V x 2 AAA batteries

Battery Cover (ii)

Battery Box (iii)

Screw (i)

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4-3 Fuse Replacement

Refer to Figure 3 and the following procedure to examine or replace the meter’s fuse:

1. Perform steps 1 through 3 of the battery replacement procedure.

2. Than remove the two screws from the case bottom and lift the case bottom until it gently unsnaps from the case
top.

3. Remove the defective fuse by gently prying one end of the fuse loose and sliding the fuse out of the fuse holder.

4. Install a new fuse of same size and rating. Make sure the new fuse is centered in the fuse holder.

5. Replace the case top and case bottom and battery case bottom. Make sure that the battery leads do not be
come pinched between the case halves. Reinstall the three screws.

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Figure 3

Radid Fuse 1A (500V),
10KA capacity @ 440 Vac

Top Case

Bottom Case

Fuse size is 32mm x 6.3mm

10KA capacity @ 440 Vac

Radid Fuse 16A (500V),

Rapid Fuse 10A (500V),
10KA capacity @ 440 Vac

Rapid Fuse 1A (500V),
10KA capacity @ 440 Vac

Fuse size is 32mm x 6.3mm

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HOW TO USE THE PROBE HOLDER

Clip one probe on the holder for
one handed meter operation.

Wrap the leads around the holster
to store the test probes.

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HOW TO USE THE PROBE HOLDER

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 nail at workbench.

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 : [phone] Fax : [phone]
E-mail:info @appatech.com
http://www.appatech.com

Printed In Taiwan

Copright 3 2003, APPA Tech., Corp. All rights reserved.