APPA 98II Instruction Manual

31

DIGITAL MULTIMETER

6

INSTRUCTION MANUAL

APPA 98II

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. Instruction manual.

4. Protective holster.

3

1-2 Meter Safety

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

1 DOUBLE INSULATION — Protection Class Ⅱ.

" DANGER — Risk of electric shock.
Symbols in this Manual.
# This symbol indicates where cautionary or other information is found in the manual.
FUSE

Battery

4

1-3 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 4000 counts LCD readout with 82 segments analog bar graph, auto
polarity, decimal point, “ “ AC, DC RANGE, 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 — Positiv

e input connector for Volts, Ohms Capacitance and Temperature Frequency.

5. mA Input Terminal — Positive input connector for Amp measurements (up to 400mA).

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

7. Range Switch, (Manual Range) — “Range” switch is pressed to select manual ranging and to change ranges.

When pressed the “Range” annunciator is displayed. Consecutively press­ ing the “Range” switch allows selection of the appropriate range for meas­ urement. To return to “Autoranging” press the “Range” switch and hold
simultaneously for 2 seconds.

5

8. Blue Switch — Press the switch to toggle between AC Voltage / Current and DC Voltage / Current in the
Voltage / Current mode or to toggle between Resistance and continuity and diode in Ω/ /:
mode or to toggle between Frequency and RPM in Hz/RPM mode.

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

This switch could be used in “MIN/MAX” mode or “PMIN/MAX” mode.

10. % Hz Switch — This switch is used to quickly view the frequency during measuring the AC voltage or current.
Press “ % Hz “ switch once the LCD is changed to display frequency. Push “ % Hz “ switch
again, the LCD back to display the AC signal amplitude reading. In “ % Hz “ mode, pressing
RANGE key 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 5% of
full scale range, the user shall increase the sensitivity. Pressing Range switch in “ % Hz “
mode also changes range of the original voltage or current mode.

6

Figure 1

7

SPECIFICATIONS

2-1 General Specifications
Display : The Liquid Crystal Display (LCD) has a maximum reading of 4000 and 82 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 30 minutes.
Operating Ambient : 0℃ ~ 30℃ (≦80%R.H), 30℃ ~ 40℃ (≦75%R.H),

40℃ ~ 50℃ (≦45%R.H).

Storage Temperature : -20℃ to 60℃ , 0 to 80% R.H. when battery removed from meter.
Temperature Coefficient : 0.15 x (Spec.Acc’y) / ℃, <18℃ or > 28℃ .

Power Requirements : Standard 9V battery NEDA 1604, IEC6F22, JIS006P.
Battery Life : Alkaline 300 hours.

8

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

Accessories : Protective Holster , Battery (installed), Test leads and Instruction Manual.

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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2-3 Electrical Specifications

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

(1) DC Volts

Range Resolution Accuracy

Over voltage

protection

400mV 100µV

±(0.25%reading + 5digits)

DC 1000V

40V 10mV

±(0.25%reading + 1digit) 400V 100mV

1000V 1V

4V 1mV

±(0.4%reading + 1digit)

Input Impedance : 10MΩ . (over 1000MΩ in 400mV range).

10

(2) AC Volts

Input Impedance : 10MΩ // less than 100pF.

1. ±(1.5% reading + 5digits) for (50% ~ full scale) of range.

2. Frequency Response : 40Hz ~ 500Hz .

3. Frequency Response : 50Hz ~ 60Hz.
AC Conversion Type : AC conversions are ac-coupled, true rms responding, calibrated to the rms value sine
wave input.

Range Resolution Accuracy Over voltage protection

±(2.0%reading + 10digits)3

750V rms

±(1.3%reading + 5digits)1

40Hz to 1KHz

400mV 0.1mV

40V 10mV
400V 100mV
750V 1V

4V 1mV

±(1.3%reading + 5digits)

1 2

11

Crest Factor : +1.5% addition error for C.F. from 1.4 to 3 where C.F. = Peak
+3.0% addition error for C.F. from 3 to 4 RMS

(3) DC Current

Range Resolution Accuracy Voltage Burden

±(0.6%reading + 2digits) 200mV max
±(0.7%reading + 2digits) 2V max
±(1.0%reading + 3digits) 2V max

40mA 10µA

400mA 0.1mA

10A 10mA

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

10A (500V) fast blow fuse (10KA breaking capacity @ 440Vac) for A input.
(size 32 × 6.3 mm)

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(4) AC Current

Range Resolution Accuracy Voltage Burden

±(2.0%reading + 5digits)

200mV max

2V max

±(2.5%reading + 5digits) 2V max

40mA 10µA

400mA 0.1mA

10A 10mA

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

(size 32×6.3mm)
10A (500V) fast blow fuse (10KA breaking capacity @440Vac) for A input.
(size 32×6.3mm)
AC Conversion Type : AC conversions are ac-coupled true rms responding, calibrated to the rms value sine

wave input.
Crest Factor : +1.5% addition error for C.F. from 1.4 to 3 C.F. = Peak
+3.0% addition error for C.F. from 3 to 4 RMS

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(5) Resistance

Range Resolution Accuracy

Overload

Protection

±(0.7%reading + 3digits)

600V rms

±(0.4%reading +3digits)

±(0.6%reading + 3digits)
±(1.5%reading + 5digits)

400Ω

0.1Ω
4KΩ 1Ω
40KΩ 10Ω

400KΩ 100Ω

4MΩ 1KΩ

40MΩ 10KΩ

Open circuit Voltage : -1.3V approx.

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(6) Diode Check and Continuity

Range Resolution Accuracy

Max. Test

Current

Max. Open

Circuit Voltage

1mV

±(1.5%reading + 5digits)*

1.5mA 3V

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

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

15

(7) Frequency / RPM

Range Resolution Sensitivity Accuracy

Overload

Protection

4.0KHz/40KRPM 1Hz/30RPM

100mV rms

Frequency :

0.01% ± 1digit

RPM :

0.01% ± 10digits

600V rms

40KHz/400KRPM 10Hz/300RPM
400KHz/4MRPM 100Hz/3KRPM
4MHz/40MRPM 1KHz/30KRPM 250mV rms

40MHz/400MRPM 10KHz/300KRPM 1V rms

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(8) Capacitance

Range Resolution Accuracy Overload Protection

4nF 1pF

±(3%reading + 10digits)

600V rms

40nF 10pF
400nF 100pF

4µF 1nF
40µF 10nF
400µF 100nF

* 4mF 1µF

** ±(5%reading + 20digits)

* 40mF 10µF

* ±(2%reading + 8digits)

* 4mF and 40mF ranges may have rolling within accuracy.
** specify reading < half full scale of range.

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(9) VAHz

Function Range Sensitivity Accuracy

ACV

400mV

40mV rms

0.01%reading + 5digits

4V

0.2V rms

40V 2V rms
400V 20V rms
750V 200V rms

40mA 8mA rms

400mA 80mA rms

10A 8A rms

ACA

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(10) 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 30 minutes, the meter automatically turns the power off. When this happens, the state (non-
logic measurement) of the meter is saved, the meter can be turned back on by pressing any switch or
changing the rotary switch. If the meter is Re-Powered by pressing a switch, the LCD displays the saved
state, press the Hold switch to disable the hold state. The meter will alarm 15 seconds before automatically
turning power off , any key press or rotary change will reset Auto-Power-Off.

(11) Disable Auto Power Off

In order to disable auto power off function, power up the meter whilst pressing down any switch other than the
“HOLD” of BLUE switch.

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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 pushing the “BLUE” key switch.

#

WARNING

TO AVOID ELECTRICAL SHOCK, HAZARD OR DAMAGE TO METER, DO NOT A ATTEMPT TO
MEASURE VOLTAGE 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 400mV RANGE, EVEN THOUGH YOU DON’T
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 IS AT 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 ” .

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. This value
must be subtracted from any subsequent circuit resistance measurements.

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3-5 Continuity Check by Internal Sounder

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 internal sounder will operate 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 “ VΩ Hz ” input terminal.

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

0.400V and 0.900V. If the diode under test is defective. “0.000” (short circuit) or “OL” (non-conductance) is
displayed. During reverse check of a diode, the diode under test is defective if “0.000” or other values are
displayed.

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3-7 Hz / RPM Measurement

1. Connect the red test lead to the “ VΩ Hz ” 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.

3-8 Capacitance Measurement

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

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

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

4. In order to ensure the best accuracy in measurement of low capacitance, to memorize the stray capacitance of
open test leads in mind to subtract from reading.

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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 one 9V 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 battery cover screw (i).

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

4. Lift the battery from the battery compartment and carefully disconnect the battery connector leads.

5. Snap the battery connector leads to the terminals of a new battery and reinsert the battery into the battery
compartment.

6. Replace the battery cover and make sure that the battery leads do not become pinched between the

case bottom and case top.

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Figure 2

Screw (i)

Battery Cover (ii)

9V Battery

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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 though 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 cover. Make sure that the battery leads do not become
pinched between the case halves. Reinstall the three screws.

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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

Figure 3

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

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

HOW TO USE THE PROBE HOLDER

29

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.