AP31
MULTITESTERINSTRUCTION MANUAL
Thank you for purchasing a SANWA tester Model
AP31 You are kindly requested to thoroughly readthis manual before use for safety.

SANWA ELECTRIC INSTRUMENT CO.,LTD.
Dempa Bldg, Sotokanda2-Chome Chiyoda-Ku, Tokyo, Japan1.0 SAFETY RULES● This meter is designed and tested in accordance with IEC publication 1010, pollution
degree Ⅱ and installation category (overvoltage category) Ⅱ.
● This meter has been tested according to the following EC Directives:● 89/336/EEC (EMC, Electromagnetic Compatibility) EN55022, EN50082-1● 73/23/EEC (Product safety law, Low Voltage Directive) EN61010-1● This meter is designed to be indoor use at temperature 5℃ to 40℃ and altitude up to 2,000m.
● To ensure that the meter is used safely, follow all safety and operating instructions in thismanual. If the meter is not used as described in this manual, the safety features of themeter might be impaired.

2.0 INTERNATIONAL SYMBOLS
Important Information see manualHigh Voltage

ACGroundDC

Double Insulation

3.0 SPECIFICATIONS
3.1 General Specifications
Display: Analog Display.
Switching range: Manual Operation.
Operating temperature and humidity : 5℃ to 40℃, max. 75％RH.
Power source: IEC R03 Single 1.5Volt AAA size battery
Fuse: 5×20mm 250V/500mA Fast Acting

: 120 (H) ×85 (W) ×30 (D) mm.
: Approx. 150g (including battery and test leads): Complete with Operation Manual

Dimensions
WeightPacking

3.2 Electrical Specifications
Measuring range and Accuracy (23℃±5℃, max. 75％ RH, no condensation)
DC Voltage

AC Voltage

DC Current
Resistance
DecibelBattery Test

Range
Accuracy
Sensitivity
Range
Accuracy
Sensitivity
Range
Accuracy
Range
Accuracy
Range
1.5VAccuracy
9.0V
Accuracy

Meter Resistance : 2kΩ/V

10/50/250/500V±5％ against full scale
2KΩ/V
50/250/500V±5％ against full scale
2KΩ/V
25/250mA±5％ against full scale
R×10,×1K(measurement up to 500kΩ)±3％ of arc+4 to 56 (0dB 1mW 600Ω)
110mA
±10％
21.5mA±10％

4.0 PANEL DESCRIPTION
1 .Case with protective bumper
2 .Analog display
3 .Resistance zero adjustment knob
4 .Resistance range
5 .Battery test range
6 .DC current range
7 .Pin cover
8 .Attachable test leads with probes
9 .Power off
10.Range switch
11.DC voltage range
12.AC voltage range

7182345691011125.0 FITTING AND REPLACING THE BATTERY AND FUSE
1) Ensure that the instrument is not connected to any external circuit, set the selector switch
to OFF position and remove the test leads from any live source.
2) Remove the screws on the bottom case, and lift bottom case.
3) Replace the battery (Single 1.5V Size: AAA battery) or fuse (Fast Acting: 500mA/250V5mm×20mm) with the same type and rating.
4) Reinstate the bottom case, tighten the securing screws.

6.0 OPERATIONWARNING
1 ) When measuring voltage ensure that the instrument is not connected or switched to a current
or resistance range. Always ensure that the correct terminals are used for the type ofmeasurement to be made.
2 ) Use extreme care when measuring voltage above 50V, especially from sources where highenergy exists.
3 ) Avoid making connections to "live" circuits whenever possible.
4 ) When making current measurements ensure that the circuit is not "live" before opening itin order to connect the test leads.
5 ) Before making resistance measurements, ensure that the circuit under test is de-energized.
6 ) Always ensure that the correct function and range is selected. If in doubt about the correct
range, start with the highest and work downwards.
7 ) Extreme care should be taken when using the instrument to conjunction with a current
transformer connected to the terminals. High voltage may be produced at the terminals if
an open circuit occurs.
8 ) Ensure that the test leads and prods are in good condition with no damage to the insulation.
9 ) Take care not to exceed the over-load limits as given in the specifications.
10) Fuse for replacement must be of the correct type and rating.
11) Before opening the case of the instrument to replace the battery or fuse, disconnect thetest leads from any external circuit, set the selector switch to "OFF" position.

6.1 DC Voltage Measurements
Set the Range switch to desired "DC V" range and connect the test leads across the sources
or load under measurement. If the voltage range is not known beforehand, set the range
switch to the highest range and work down. Read the DC voltage reading on the "DC V"scale (Black color)
6.2 AC Voltage Measurements
Set the Range switch to desired "AC V" range and connect the test leads across the source orload under measurement. If the voltage range is not known beforehand, set the range switch
to the highest range and work down. Read the AC Voltage on the "AC V" scale (Red color).
6.3 Resistance Measurements
Set the Range to the desired "Ω" (OHM) range, Short two probes together and adjust the "0Ω ADJ" knob to set the pointer to "0" next to the resistance scale. If the pointer cannot be set
to "0", replace the battery by a new one and set the pointer again. If the resistance being
measured is connected to a circuit, turn off power and discharge all capacitors before
applying test prods. Connect the test leads across the source or load under measurement.
Read the resistance reading on the "OHMS" scale (Green Color), use proper multiply to get
the correct value (R×10, R×1K), depending on the resistance range.
6.4 DC Current Measurements
Set the Range switch to the desired "DC mA" range, connect test leads IN SERIES with theload in which current is to be measured. If the current range is not known beforehand, set therange switch to the highest range and work down. Read the DC current reading on the "mA"
scale (Black color).

6.5 Decibel Measurements
Set the Range switch to the desired "AC V" range, connect the test leads across the sources
or load under measurement. For "50V AC" Range read dB reading on the dB scale directly,
but for other ranges, calculate the reading with the following table:dB RangeAC Range
Add Value

4 to 3650V
018 to 50
250V
1424 to 56500V
20

Note: For Absolute dB measurement, circuit impedance must be 0Ω, 0dB = 1mW dissipated ina 600Ωload.
For the signal with DC component. Connect a capacitor with capacity > 0.1μF between
test probes and circuit under test.
6.6 Battery Check for 9.0V and 1.5V
Set the Range switch to the desired "BATT" Range connect the test leads across the battery
under test. Read the reading on the "BATT." scales ( "RED" color for bad, "Green" color forGood)WARNING□BEFORE ATTEMPTING BATTERY AND FUSE REMOVAL OR REPLACEMENT,DISCONNECT TEST LEADS FROM ANY ENERGISED CIRCUITS TO AVOID SHOCKHAZARD.