KYORITSU KEW 3121A, KEW 3123A, KEW 3122A Instruction Manual

KEW 3121A, 3122A, 3123A

KEW3121A, 3122A KEW3123A

INSTRUCTION MANUAL

HIGH VOLTAGE INSULATION TESTER

CONTENTS

Page

1．Safety warnings …………………………………………………1

2．Features …………………………………………………………2

3．Specifications ………………………………………………3 〜 4

4．Instrument Layout ………………………………………………5

5．Operating Instructions …………………………………………6

  5-1．Mechanical Zero Adjustment ……………………………6

  5-2．Battery Check ……………………………………………6

  5-3．Insulation Resistance Measurement ……………………7

  5-4．Continuous Measurement ………………………………7

  5-5．Use of Guard Terminal ……………………………………8

6．Battery Replacement ……………………………………………9

7．Accessories and options ………………………………………9

  7-1. Metal part for Line Probe, and replacement ……………9

  7-2. How to use the adaptor for recorder …………………10

8．How to fix the Meter to the Hard case ………………………11

9．Cleaning Meter Cover …………………………………………12

− 1 −

1. Safety warnings

Please read through these operating instructions before using the
instrument to avoid any dangers such as electrical shock and to
ensure safe operation of the instrument.

Pay particular attention to all WARNING and CAUTION in this
instruction manual. WARNING indicates warnings to avoid electrical
shock and CAUTION indicates cautions to avoid damage to the
instrument.

#

WARNING

● Th

is instrument cannot test live conductors. Ensure that the

circuit to be tested is powered off before performing a test.

● Never open the Battery cover or remove the Instrument panel

during a measurement.

● Confirm that the Rotary switch is at the OFF position, and then

connect the test leads.

● Do not attempt to make measurement in the presence of

flammable gasses. Otherwise, the use of the inst

rument may

cause sparking, which can lead to an explosion.

● Never attempt to make any measurement if any abnormal

conditions, such as a broken cover or exposed metal parts are
present on the Instrument or test leads.

● Set the Function switch to OFF position after use, and ensure

the Test button is released and unlocked.

#

CAUTION

● Do no t exp ose the ins tru men t to direct sunligh t, high

temperature

s, humidity or dew.

● Never leave the instrument in the environment of 60˚C or

higher temperatures.

● Do not use the instrument if it or test lead is wet.

● Remove the batteries if the instrument is to be stored and will

not be in use for a long period.

● Use a damp cloth with neutral detergent or water for cleaning

the instrument. Do not use abrasives or solvents.

− 2 −

2. Features

●  Batt ery powered, the instrum ents test ins ulation up to
100000MΩ at 2500V for KEW 3121A, 200000MΩ at 5000V
for KEW 3122A and 200GΩ at 5000V and 400GΩ at 10000V
for KEW 3123A.

●  Suited for heavy duty electrical maintenance and servicing of
industrial installations, cables, transformers, generators and
switchgear where high voltage insulation tests are required.

●  Dual sc a l e s fo r low an

d hi g h ra n ges wh i c h ch a nge
automatically. Colour coded scales for easy reading plus
LED's that illuminate in matching colour.

●  Drip proof construction. The case is sealed with rubber

gaskets to protect internal circuit against rain.

●  Hard carrying case furnished as standard accessory. Houses

both instrument and test leads in compact form. Made of
plastic, it is highly water resistant.

●  Designe

d for low power consumption. Since the maximum

current consumption is 90mA eight pieces of 1.5V SUM-3（or
equivalent ） permit about 6 hours of continuous operation
even when the instrument is used on maximum load or twice
longer on minimum load.

●  Rated output voltage is maintained down to 100MΩ for KEW
3121A, 200MΩ for KEW 3122A and 0.2GΩ/0.4GΩ for KEW
3123A. This permits accurate measurements of

low insulation

resistance.

●  Optional adapter MODEL8324 is available for connection to
recorder and enables cable insulation monitoring.