KYORITSU 3123A User Manual
INSTRUCTION MANUAL
KEW3121A, 3122A KEW3123A
HIGH VOLTAGE INSULATION TESTER
KEW 3121A, 3122A, 3123A
CONTENTS
Page
1．Features …………………………………………………………1
2．Specifications ……………………………………………2 〜 3
3．Instrument Layout ………………………………………………4
4．Operating Instructions …………………………………………5
4-1．Mechanical Zero Adjustment ……………………………5
4-2．Battery Check ……………………………………………5
4-3．Insulation Resistance Measurement ……………………6
4-4．Continuous Measurement ………………………………6
4-5．Use of Guard Terminal …………………………………7
5．Battery Replacement ………………………………………8
6．Accessories and options ………………………………………8
6-1. Metal part for Line Probe, and replacement ……………8
6-2. How to use the adaptor for recorder …………………8
7．Cleaning Meter Cover …………………………………………9
− 1 −
1. Features
● Battery powered, t he instruments test insulation 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 scale s for l o w an
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
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
resistance.
d for low power consumption. Since the maximum
d high r a n g e s wh i c h ch a n g e
low insulation
− 2 −
2. Specifications
DC Test Voltage 2500V 5000 V 5000V 10000V
Measuring Ranges
Accuracy
Operating
Temperature & Humidity
Storage
Temperature & Humidity
Insulation Resistance 1000MΩ max./ 1000V between electrical circuit
Withstand Voltage 5000V AC for one minute between electrical circuit & housing case
Dimensions 200（L）×140（W）×80（D）mm
Weight Approx. 1kg（including batteries）
Power Source 8 pcs of R6P (AA) battery or equivalent
Accessories
Insulation
Resistance
Output
Voltage
KEW 3121A KEW 3122A KEW 3123A
0〜2000MΩ/
1000〜100000MΩ
（automatic change）
±5% of reading
（100〜50000MΩ）
±10% of reading
or 0.5% of scale length
（ ranges other than
listed above）
23℃ ±5℃
at
±10% of reading
（100〜50000
±20% of reading
or 1.0% of scale length
（ ranges other than
listed above）
at −10℃〜＋40℃
2500V ±5%
（100〜50000MΩ）
Hard Carrying Case:M-9158 Test Leads
(Line Probe:M-7165A,
Cord:M-7224A, Guard Cord:M-7225A)
MΩ）
0〜5000 MΩ/
2000〜 200000MΩ
(automatic change)
±5% of reading
（200〜 100000MΩ）
±10% of reading
or 0.5% of scale length
（ ranges other than
listed above）
at 23℃ ±5℃
±10% of reading
（200〜 100000MΩ）
±20% of reading
or 1.0% of scale length
（ ranges other than
listed above）
at −10℃ 〜＋40℃
5000V ±5%
（200〜 100000MΩ）
−10℃ 〜＋40℃ at 85% max. relative humidity
−20℃ 〜＋60℃ at 90% max. relative humidity
Earth
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