MODEL 3131AANALOGUE INSULATION/CONTINUITY TESTER

INSTRUCTION MANUAL

KYORITSU ELECTRICAL INSTRUMENTS WORKSLTD., TOKYO JAPAN

Contents

1. Safety Warnings .................................................................................... 1

2. Features ............................................................................................... 4

3. Specifications ...................................................................................... 5

4. Instrument Layout ................................................................................. 7

5. Preparation for Testing ........................................................................... 8

5-1 Removing the Cover ........................................................................ 8

5-2 Mechanical Zero Adjustment ............................................................ 9

5-3 Battery Voltage Check ..................................................................... 9

5-4 Test Probe Connection .................................................................... 9

5-5 Test Probe Check ........................................................................... 9

6. Operation ........................................................................................... 10

6-1 Disconnection and Check of Power Source of Circuit Under Test ................ 10

6-2 Insulation Resistance Measurement ................................................ 11

6-3 Continuity Testing (Resistance Tests) ............................................. 12

6-4 Continuous Measurement .............................................................. 13

7. Back Light Function ............................................................................ 14

8. Battery & Fuse Replacement ............................................................... 15

8-1 Battery Replacement ...................................................................... 15

8-2 Fuse Replacement ........................................................................ 15

9. Notes on Accessories .......................................................................... 16

9-1 How to Fit Strap Belt & Test Probe Pouch ........................................ 16

10. Cleaning of the Instrument .................................................................... 17

11. Service ............................................................................................... 17

1

This instrument has been designed, manufactured and tested according to IEC 61010: Safety requirements for Electronic measuring apparatus, and delivered in the best condition after passed the inspection. This instruction manual contains warnings and safety rules which must be observed by the user to ensure safe operation of the instrument and retain it in safe condition. Therefore, read through these operating instructions before using the instrument.

# WARNING Read through and understand the instructions contained in this manual

before using the instrument. Keep the manual at hand to enable quick reference whenever necessary. The instrument is to be used only in its intended applications. Understand and follow all the safety instructions contained in the manual.It is essential that the above instructions are adhered to. Failure to follow the above instructions may cause injury, instrument damage and/or damage to equipment under test. Kyoritsu is by no means liable for any damage resulting from the instrument in contradiction to these cautionary notes.

The symbol # indicated on the instrument, means that the user must refer to the related parts in the manual for safe operation of the instrument. It is essential to read the instructions wherever the symbol appears in the manual.

# DANGER is reserved for conditions and actions that are likely to cause serious or fatal injury.

# WARNING is reserved for conditions and actions that can cause serious or fatal injury.

# CAUTION is reserved for conditions and actions that can cause injury or instrument damage.

1. SAFETY WARNINGS

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Please refer to following explanation of the symbols used on the instrument and in this manual.

# User must refer to the explanations in the instruction manual.

Caution, risk of electric shock.

Instrument with double or reinforced.

Protection against wrong connection is up to 440V.

EARTH GROUND

This instrument satisfies the marking requirement defined in the WEEE Directive 2002/96/EC. This symbol indicates separate collection for electrical and electronic equipment.This marking means they shall be sorted out and collected as ordained in DIRECTIVE 2006/66/EC.This directive is valid only in the EU. When you remove batteries from this product and dispose them, discard them in accordance with domestic law concerning disposal. Take a right action on waste batteries, because the collection system in the EU on waste batteries are regulated.

# DANGER Confirm a proper operation of the instrument with a well-known power supply. Do not use this instrument on energized (LIVE) circuits. Do not attempt to make measurement in the presence of flammable gasses. Otherwise, the use of the instrument may cause sparking, which can lead

to an explosion. Do not make measurement when thunder is rumbling. If the instrument

is in use, stop the measurement immediately and remove the instrument from the measured object.

Never attempt to use the instrument if its surface or your hand is wet. Never open the battery compartment cover and the instrument case when

making a measurement. Do not exceed the maximum allowable input of measuring ranges. The instrument is to be used, only in its intended applications or conditions. Otherwise, safety functions equipped with the instrument doesn't work,

and instrument damage or serious personal injury may be caused. Always Keep your fingers and hands behind the barrier on test probe to

avoid the possible shock hazard.

3

# WARNING Never attempt to make any measurement, if the instrument has any

structural abnormality such as cracked case or exposed metal parts. Do not turn the range selector switch while the test probe are connected

to the circuit under test. Do not install substitute parts or perform any unauthorized modification

of the instrument. Return the instrument to Kyoritsu or your distributor for service and repair to ensure the safety features are maintained.

Do not try to replace the batteries and fuse if the surface of the instrument is wet.

Firmly insert the plug into the terminal when using test probe. Make sure to disconnect the test probe from the instrument before

opening the battery compartment cover for battery and fuse replacement.

# CAUTION Always make sure to set the range selector switch to the appropriate

position before making measurements. Do not expose the instrument to the direct sun, dew fall or extreme

temperature and humidity. When the instrument will not be in use for a long period of time, place it in

storage after removing batteries. Use a damp cloth soaked in water or neutral detergent for cleaning the

instrument. Do not use abrasives or solvents.

# WARNING Measurement Category / Over-voltage categories(CAT) The restrictions on the maximum voltage level for which the this product

can be used, depend on the measurement categories specified by the safety standards.

Do not apply any input level higher than maximum allowable input. AC300V CAT IIICAT III Distribution board, circuit breaker, etc. For measurements

performed in the building installation.

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2. Features

MODEL-3131A is an analogue insulation tester with five ranges for insulation resistance measurement and continuity testing (resistance tests) of low voltage installations.

Designed to safety standards: IEC61010-1 IEC61010-031 IEC 61557-1,2,4,10

Dust and drip proof constrution to IP54

Three insulation test ranges : 250V/100M, 500V/200M, 1000V/400M

Two continuity test ranges : 2, 20

Back light function to facilitate work at night or dimly lit locations

Easy for battery check

Power-on indication LED lighting during battery check and measurement

Live circuit warning indication with LED lighting and the buzzer sound

Fuse protected.

Color coded scales and range switch position for easy reading

Uses only 6 1.5V battery type R6, AA or equivalent

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3. Specifications

Measuring Range and Accuracy (at 235, relative humidity 45-75%) Insulation Resistance Ranges:(IEC 61557-2)Nominal Output Voltage 250V 500V 1000VMeasuring RangesOpen-CircuitVoltageShort-Circuit Current

Nominal Current

Accuracy

0 - 100M

250V DC +20% max.

1.3mA approx

1mA DC min.at 0.25M

5% of indicated valueat 0.1M- 10M0.7% of scale length at ranges other than above ranges

0 - 200M

500V DC +20% max.

1mA DC min.at 0.5M

5% of indicated valueat 0.2M- 20M

0 - 400M

1000V DC + 20% max.

1mA DC min.at 1M

5% of indicated valueat 0.4M- 40M

Continuity Test (Resistance Test) Ranges:(IEC 61557-4)RangesMeasuring Ranges

x 10 - 2

x 100 - 20

Open-Circuit VoltageMeasuring CurrentAccuracyZero Adjustment Range

4 - 9V DC200mA DC min.

3% of scale length0.2 min.

Ranges250V/100M500V/200M1000V/400M

Measuring range to keep operating instrumetal uncertainty Maximum percentage oper