Insulation Tester
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High Voltage Insulation Tester


KEW 3128

High Voltage Insulation Tester
Selection Guide Product Catalogue
Software Instruction Manual

Microprocessor controlled high voltage insulation resistance tester with Diagnostic functions.
Suitable for analyzing the insulation characteristics of cables, transformers, motors, generators, high-pressure switches, insulators, wiring installations, etc.
6 ranges: 500V, 1000V, 2500V, 5000V, 10000V, 12000V
Fine adjustment of voltage setting at each range is also possible
Graphic representation of the insulation resistance and leakage current versus time on large display with bar graph and backlight.
Can be operated from built-in rechargeable battery or from AC line.
Automatic discharge after test with monitoring of the discharge voltage.
Internal memory can store about 43,000 data (max).
Robust design for field use with IP64 rating (with lid closed).


Backlight USB  
  3128 500V/1000V/2500V/5000V/10000V/12000V
Insulation resistance (*): Accuracy is not guaranteed with setting of 250V or less
Rated voltage 500V 1000V 2500V 5000V 10000V 12000V
500GΩ 1TΩ 2.5TΩ 5TΩ 35TΩ
Accuracy 400k - 50GΩ
800k - 100GΩ
2M - 250GΩ
4M - 500GΩ
8M - 1TΩ
50G - 500GΩ
100G - 1TΩ
250G - 2.5TΩ
500G - 5TΩ
1T - 10TΩ
10T - 35TΩ
Values are displayed, but accuracy isn't guaranteed
Short circuit current Max 5.0mA
Load resistor to output rated voltage 0.5MΩ or more 1MΩ or more 2.5MΩ or more 5MΩ or more 20MΩ or more 24MΩ or more
Output voltage
Rated voltage 500V 1000V 2500V 5000V 10000V 12000V
Monitor accuracy ±10%±20V ±10%±20V ±10%±20V ±10%±20V ±10%±20V ±10%±20V
Output accuracy 0 - +20% 0 - +10% 0 - +10% 0 - +10% -5 - +5% -5 - +5%
Selectable range 50 - 600V
(in steps of 5V)
610 - 1200V
(in steps of 10V)
1225 - 3000V
(in steps of 25V)
3050 - 6000V
(in steps of 50V)
6100 - 
(in steps of 100V)
10100 - 
(in steps of 100V)
Voltage measurement
Measuring range DCV : ±30 - ±600V, ACV : 30 - 600V (50/60Hz)
Accuracy ±2%rdg±3dgt
Current measurement
Measuring range 5.00nA - 2.40mA (Depending on the insulation resistance)
Capacitance measurement
Measuring range 5.0nF - 50.0µF 5.0nF - 1.0µF
(display range: 5.0nF - 50.0µF)
Accuracy ±5%rdg±5dgt
Withstand voltage AC8770V : between line terminal and enclosure / 5sec (50/60Hz)
AC6880V : between the measuring terminal and enclosure / 5sec (50/60Hz)
AC2330V : between the power connector and enclosure / 5sec (50/60Hz)
Operating temperature & humidity range
-10ºC - 50ºC / Relative humidity 85% or less
(when operating with an external power supply, no condensation)
0ºC - 40ºC / Relative humidity 85% or less
(when operating with battery, no condensation)
Storage temperature & humidity range -20ºC - 60ºC / Relative humidity 75% or less (no condensation)
Applicable standards IEC 61010-1 CAT IV 600V Pollution degree 2,
IEC 61010-031, IEC 61326, IEC 60529 (IP64): with the lid closed.
Power source Rechargeable Lead storage battery (12V)*
Charging time: approx. 8 hours / AC Power supply (100V - 240V, 50/60Hz)

* Continuous measuring time:
approx. 4 hours
(a load of 100MΩ at the Insulation resistance 12000V Range.)
approx. 2 hours
(Max current consumption in range while rated currents are maintained.)
Dimension 330 (L) × 410 (W) × 180 (D) mm *Instrument and Hard case
Weight 9kg approx. (including battery) *Instrument and Hard case
Accessories 7170 (Main cord), 7224A (Earth cord), 7225A (Guard cord), 7226A (Line probe),
7227A (Line probe with alligator clip), 8029 (Extension prod),
8212-USB-W (USB adaptor with KEW Windows (Software)),
Instruction manual
Optional 7254 (Longer Line probe with alligator clip)





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