Ingeniero

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
  4-4．Continuous Measurement

……………………6

………………………………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. Features● B attery powered, the 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.
● D ual scales for low an dhigh ranges which change
automatically. Colour coded scales for easy reading plus
LED's that illuminate in matching colour.
● D rip 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.● Designed 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 accuratemeasurements of low insulation
resistance.

−1−

2. Specifications
KEW 3121A

Measuring Ranges

Accuracy

Insulation
Resistance

Output
Voltage
Operating
Temperature & Humidity
Storage
Temperature & Humidity
Insulation Resistance
Withstand Voltage

KEW

31

2500V

DC Test Voltage

5000

V

0∼2000MΩ/
1000∼100000MΩ
（automatic change）

0∼5000 M
2000∼ 20
(automaticch

±5% of reading
（100∼50000MΩ）
±10% of reading
or 0.5% of scale length
（ ranges other than
listed above）
at 23℃ ±5℃
±10% of reading
（100∼50000MΩ）
±20% of reading
or 1.0% of scale length
（ ranges other than
listed above）
at −10℃∼＋40℃
2500V ±5%
（100∼50000MΩ）

±5% of
（200∼
±10% of
or 0.5% of
（ ranges
listed
at 23℃
±10% of
（200∼
±20% of
or 1.0% of
（ ranges
listed
at−10℃
5000V
（200∼

re
10
re
sc
ot
ab
±
re
10
re
sc
ot
ab
∼
±5
10

−10℃

∼

−20℃

∼

1000MΩ max./

10

5000V AC for one

Dimensions

m

20

Weight

Approx.

1k

Power Source

8 pcs of

R6

Hard Carrying Case:M-9158 Test Leads
(Line Probe:M-7165A, Earth
Cord:M-7224A, Guard Cord:M-7225A)

Accessories

−2−

3122A
V

KEW 3123A
5000V

10000V0 MΩ/
200000MΩ
ic change)

0∼5GΩ/2∼200GΩ
(automatic change)

0∼10GΩ/4∼400GΩ
(automatic change)

of reading
100000MΩ）
f reading
f scale length
s other than
d above）
±5℃
f reading
100000MΩ）
f reading
f scale length
s other than
d above）
∼＋40℃
±5%
100000MΩ）

±5% of reading
（0.2∼100GΩ）
±10% of reading
or 0.5% of scale length
（ ranges other than
listed above）
at 23℃±5℃
±10% of reading
（0.2∼100GΩ）
±20% of reading
or 1.0% of scale length
（ ranges other than
listed above）
at −10℃∼＋40℃
5000V ±5%
（0.2~100GΩ）

±5% of reading
（0.4∼200GΩ）
±10% of reading
or 0.5% of scale length
（ ranges other than
listed above）
at 23℃ ±5℃
±10% of reading
（0.4∼200GΩ）
±20% of reading
or 1.0% of scale length
（ ranges other than
listed above）
at...