HIOKI ST5520 Fast Insulation Tester

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Benefits of the ST5520 Electrical Safety Insulation Tester

  • Fast insulation test assess in only 50 ms.
  • Freely configurable test voltage from 25 to 1000 V with 1 V resolution.
  • Quick discharge of residual voltage.

HIOKI ST5520 Fast Insulation Tester

The HIOKI ST5502 is a fast industrial electrical safety tester designed for insulation resistance testing of electrical devices and components. The ST5520 delivers pass/fail assessment in as fast as 50 ms. The device uses 25 V...1000 V test voltage with 1 V resolution.

  • Insulation tester.
  • Rapid 50 ms testing speed, 25...1000 V test voltage with 1 V resolution.
  • Insulation resistance test up to 9990 MΩ (at 500...1000 V).
  • Memory, comparator, timer function.
  • Quick discharge of residual voltage.
  • Contact check function (prevents errors due to poor contact).
  • Short-circuit check function (stops potential defects from reaching the market).
  • Ideal for battery production lines.
  • Built-in external I/O output, ST5520-01 additional BCD output.

Model Overview

ModelHIOKI ST5520HIOKI ST5520-01
Measurement itemsInsulation resistance (applied DC voltage method)
Testing voltageMeasurement range: AUTO/MANUAL setting is possible;
25 V ≤  V < 100 V (2.000/20.00/200.0 MΩ),
100 V ≤  V < 500 V (2.000/20.00/200.0/2000 MΩ),
500 V ≤  V ≤ 1000 V (2.000/20.00/200.0/4000 MΩ)
Basic accuracy±2% rdg. ±5 dgt.;
25 V ≤  V < 100 V (0...20 MΩ),
100 V ≤  V < 500 V (0...20 MΩ),
500 V ≤  V ≤ 1000 V (0...20 MΩ)
Measurement speedFast: 30 ms/time, slow: 500 ms/time (selectable)
Internal memorySaved items: Rated measurement voltage, comparator upper/lower limit values, test mode, beep sound to distinguish the result, test time, response time, resistance range, measurement speed;
memory capacity: Up to 10 items (can be saved/loaded)
Comparator settingUPPER_FAIL: Measured value ≥ upper limit value;
PASS: Upper limit value > measured value > lower limit value;
LOWER_FAIL: Measured value ≤ lower limit value
Judgement processBeep sound, PASS/U.FAIL/L. FAIL: light up on LED display, When UL_FAIL, U.FAIL/L.FAIL light up simultaneously, EXT I/O output, judgement result can be obtained via RS232C
Test durationDefinition of test duration: Test duration = response time + measurement time;
function: Set the time from voltage application until pass/fail assessment;
configuration range: 0.045...999.999 s (0.001 s resolution)
Response time timerAfter the start of the test, comparator judgment operation can be prohibited until a set interval from 0.005....999.999 s (at 0.001 s resolution) has passed
Analog outputDC + 4 V f.s.
DisplayLCD, 4-level backlight
InterfaceRS232C (standard), EXT I/O (external control input, judgment result)RS232C (standard), EXT I/O (external control input, judgment result), BCD output
Power supply100...240 VAC, 50/60 Hz, 25 VA max.
Dimensions (mm)215 x 80 x 166; 1.1 kg

Included: HIOKI ST 5520 one of the versions, instruction manual, power cord, EXT I/O connector, connector cover.