DIGITAL INSULATION/CONTINUITY TESTERKEW 3551 / 3552 / 3552BT

6 ranges Insulation resistance testers
Fully protected against
accidental connection to live circuit!

Insulation statusindicator enables faster
Pass / Fail judgement
High(Pass)

Low(Fail) World’s fastest class measurement speed (0.5 sec.)
 6 ranges available for insulation

resistance test (50/100/125/250/500/1000 V)
 Insulation measurement up to 40GΩ
 Diagnostic Insulation Test : PI, DAR
Standard model

KEW 3551

With memory function

KEW 3552

With memory and Bluetooth®
communication function

KEW 3552BT

Easy to identify low or high resistance by
LCD backlight color.
Possible to set different reference values
for each insulation resistance respectively.
(3552 / 3552BT)

Using our Application the measurements can be taken and automatically saved, reducing the necessity totake notes in the field. (3552BT only)*Please contact us with inquiries about the purchase of 3552BT.

LED light & Display backlight

Diagnostic Insulation Tests

PI

Facilitate working
at dimly illuminatedlocation.
Illuminance sensor
turns the LCD backlight and LED spotlight ON/OFF.

Polarization Index

PI=PICriteria

DAR(available on KEW3552/3552BT)

Insulation resistance value 1 min. after start
4.0 or moreBest

4.0 to 2.0Good

2.0 to 1.0
Warning

1.0 or less
BadDielectric Absorption Ratio

DAR=DAR
Criteria

Memory/data transfer function

Insulation resistance value 10 min. after startInternal memory up to 1000 measurements can be transferred to a PC by
the optional adapter 8212-USB.

Insulation resistance value 1 min. after start
Insulation resistance value 15 sec. after start
1.4 or moreBest

1.25 to 1.0Good1.0 or less
Bad

Provide maximum versatility with the following functions.
 Insulation resistance measurement (6 ranges)
 AC/DC voltage measurement
 Continuity test @200mA, Low-resistanceBluetooth® communication(KEW 3552BT)

Transfer measured data
directly to the compatible
tablet or Smart phonedevices.
Save time – easy tocreate reports.
Available on download site for free.

The right model to meet your needs*Please contact us with inquiries about the purchase of 3552BT.

Model KEW 3551 / 3552 / 3552BT Specification

KEW 3551

Insulation resistance
Test voltageMeasuring range(Auto-ranging)Mid-scale value

50V

100V

125V

Accuracy
Rated current
Output short circuit current

500V

4.000/40.00/
4.000/40.00/ 4.000/40.00/ 4.000/40.00/ 4.000/40.00/
400.0/2000MΩ
400.0/500.0MΩ
100.0MΩ
200.0MΩ
250.0MΩ/20GΩ*12MΩ
5MΩ
10MΩ
100MΩ

First effective measuring range 0.100 to 10.00MΩ 0.100 to 20.00MΩ 0.100 to 25.00MΩ
±2%rdg±2dgt
Accuracy
Second effective measuring range

250V

1000V

KEW 3552

4.000/40.00/400.0/4000MΩ
/40GΩ*1200MΩ

KEW 3552BT

0.100 to 50.0MΩ

0.100 to 500MΩ

0.100 to 1000MΩ

10.01 to 100.0MΩ 20.01 to 200.0MΩ 25.01 to 250.0MΩ 50.1 to 500MΩ

501 to 2000MΩ

1001 to 4000MΩ

6 rangesinsulation
resistance

MemoryPCcommunication









 Accessories

0.050 to 0.099MΩ
±5%rdg
1.0 to 1.1mA@0.05MΩ@0.1MΩ

@0.125MΩ

@0.25MΩ@0.5MΩ

@1MΩ

7260
Test lead withremote control switch

7261A
Test lead withalligator clip

1.5mA max

Ω/Continuity*³
Resistance range

Bluetooth®

9121
Shoulder strap

40.00/400.0/4000Ω

Accuracy±2.5%rdg±8dgtOpen-circuit voltage

5V(4 to 6.9V)

Measuring current

200mA or more9173
Carrying case

VoltageRange

AC 2.0 to 600V(45 to 65Hz)DC -2.0 to -600V +2.0 to +600V

Accuracy±1%rdg±4dgt

8017A
Extension prod long Optional Accessories

GeneralApplicable standards
Communication interface
Dimension / Weight
Power source
Accessories
Optional accessories

IEC 61010 CAT Ⅲ 600V / CAT Ⅳ 300V
IEC 61010-2-034, IEC 61557-1,2,4, IEC 61326-1,2-2, IEC 60529(IP40)
USB*¹, Bluetooth® *²97(L)x156(W)x46(D)mm / Approx. 490g(including battery)
LR6/R6(AA)(1.5V) x 47243A
L-shaped probe(1,650mm)

8016
Hook type prod9186A
Carrying case

9187
Cord case7260(Test lead with remote control switch), 7261A(Test lead with alligator clip),
8017A(Extension prod long), 9173(Carrying case), 9121(Shoulder strap), LR6(AA)x4, Instruction manual
7243A(L-shaped probe), 8016(Hook type prod),8212-USB(USB adapter with "KEW Report(Software)")*¹, 9186A(Carrying case), 9187(Cord case)*1 3552/3552BT only *2 3552BT only, Bluetooth® is a trademark or registered trademark of Bluetooth SIG, Inc.
*3 Low-resistance range is protected by a built-in fuse (0.5 A/ 1000 V, Dia. 6.3 x 32 mm)

8212-USB
USB adapter
with"KEWReport(Software)"

Please read the "Safety Warnings" in the instruction manual supplied with the instrument thoroughly and completely

correct use. Failure to follow the safety rules can cause fire, trouble, electrical shock, etc. Therefore, make sure
Safety Warnings : forto operate the instrument on a correct power supply and voltage rating marked on each instrument.

For inquiries or orders :2-5-20, Nakane, Meguro-ku, Tokyo, 152-0031 Japan
Phone:+81-3-3723-0131
Fax:+81-3-3723-0152

This leaflet was produced in January 2024. The contents of this leaflet are subject to change without notice.

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