Hipot Tester with Insulation Resistance and Ground Bond Test



$6.000,00 (税込:$6.600,00

  • Max. output-voltage of AC hipot testing : 5kV/100mA(500VA)
  • Max. output-voltage of DC hipot testing : 5kV/20mA, 7.2kV/13.9mA(100W)
  • Measurement range of insulation resistance testing : 0.001MΩ to 100.0GΩ(DC-25V to -1000V/DC+50V to +7200V)
  • Measurement range of ground bond testing : 0.001Ω to 0.600Ω(3.0A to 42.0A)
  • Electrical breakdown inspection setting available
  • LAN/USB/RS232C standard digital interface
  • Easy to read LCD display for real time monitoring during tests. All measurement values and standard outlines displayed in each test

High voltage caution


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Artikelnummer: TOS9303
  • Features
  • Application
  • Dimensions
  • Options
  • Downloads


The TOS9300 series is a high performance electrical safety analyzer that complies to a wide range of universal standards. Hipot, Insulation Resistance, Ground Bond, Leakage Current (touch current and protective conductor current) and partial discharge can all be tested. A total of 6 models are available for standard compliance tests in a wide variety of applications including R&D, quality assurance manufacturing lines and laboratory tests.

ModelTest items
AC Withstanding
Voltage (AC Hipot)
DC Withstanding
Voltage (DC Hipot)
Earth Continuity
(Ground Bond)
Leakage CurrentPartial Discharge
TOS93204 channel high voltage scanner with contact check function; can be used standalone.

AC Hipot Testing with Stable Output ⟨Input Voltage Variation: ±0.3%⟩

AC Hipot Testing with Stable Output

Conventional hipot testers utilize a slide transformer to output AC line voltage. This design is susceptible to input voltage fluctuation, with outside electrical influence affecting the test results. This can result in distorted voltage being applied to the EUT which can cause product malfunctions down the line due to component malfunction.

The TOS9300 series utilizes a highly efficient PWM amplifier capable of stable high-voltage output that is unaffected by changes in the AC power line. The TOS9300 series allows for safe, stable, and highly reliable tests regardless of AC power line instability.

Programmable Detection Response Speed

Conventional withstanding voltage testers are generally used to only detect insulation breakdown, and cannot make judgements on instantaneous discharge currents like partial discharge.

However, the TOS9300 series is equipped with 5 levels of response speed settings to accurately detect low levels of insulation breakdown.Small discharges not visible to conventional withstanding voltage testers are easily detected with the TOS9300 series.

Programmable Detection Response Speed

LPFSlowMean-value response type current detector. This is similar to the current detection response of Kikusui's general-purpose AC withstanding voltage testers. This setting is suitable for detecting dielectric breakdown defined in safety standards and for general hipot tests for general electronic devices and components. This setting is not recommended for detecting corona discharge, which is not considered dielectric breakdown by typical safety standards.
MediumMean-value response type faster than SLOW setting. Upper limit judgement detection is much faster, suitable for withstanding voltage tests on compact electronic components and other EUTs prone to dielectric breakdown. Instantaneous discharges such as corona discharges with high frequencies are detected which may not be suitable for simple withstanding voltage tests.
HPFSlowExtremely small discharges such as corona discharges are detected but with low reproductibility.


Color LCD Screen for Improved Visibility!

A brand-new 7-inch LCD display allows for easy access to your custom settings, standard outlines and blueprints for easy operation.

*The image is the throat of TOS9303LC.

Color LCD Screen for Improved Visibility!

User-Friendly 10Key Configuration

The TOS9300 series has included a user-friendly keypad in addition to the basic rotary knob for easy setting configuration. The front panel USB interface also allows for direct control via keyboard*.

*106/109 Japanese keyboards and 101/104 English keyboard compliant.


Easy Firmware Updates via USB

System firmware can easily be updated via USB memory with update files directly accessible from our website.

Easy Firmware Updates via USB

LAN/USB/RS232C Standard Digital Interface

LXI compatible LAN, USB 2.0, USB-TMC compatible USB, and RS232C as standard digital interface.

LAN/USB/RS232C Standard Digital Interface

I/V Monitor Terminal (Analog Monitor)

Signal outputs on the rear panel I/V terminal allow the user to monitor current/voltage waveforms during hipot tests with only an oscilloscope. Current sensors and high voltage probes not required.

TOS9300 fig05

STATUS OUT Connector

Signals from the rear panel STATUS connector automatically activate the optional warning light (PL02-TOS) during high voltage output or unsafe test conditions.

STATUS OUT Connector

Universal Input Support

Global Support
TOS9300 Series supports universal input for varying input voltages around the world.
Programmable Output Frequency
Stable output frequency not dependent on input power source. Testing voltage is supplied at a stable 50/60Hz frequency.

Universal Input Support

AC/DC Earth Continuity Testing up to 40A

Cutting edge amp technology allows for a wide range of applications, including general AC earth conduction testing and EV/PHV system DC earth continuity testing. This also allows for strict adherence to automotive DC standard requirements; expected to increase in the near future.

AC/DC Earth Continuity Testing up to 40A

High Precision/High Resolution/High Speed

The TOS9300 is equipped with a highly accurate, high resolution RMS measurement circuit with a voltmeter of ± (1.2% of reading +5 V)/ minimum resolution 0.1V and an ammeter of ± (1% of reading +2 μA)/ minimum resolution 1μA. The series also supports an auto range function, ensuring similar accuracy in both the upper and lower limit measurements that can accurately detect connection problems in the test lead. This combined with a measurement speed of 0.1s allows for reliable testing with high accuracy and resolution.

7.2kV / 100W DC Hipot Test

Capable of performing DC Hipot tests up to 7.2 kV utilizing a stable DC/DC converter with low-ripple and load variation of 1% and below.

DC Hipot Test

Positive Electrode/Negative Electrode Insulation Resistance Testing

Testing voltage from -25V to -1000V, +50V to +7200V, with a setting resolution is 1V. Insulation resistance can be tested up to 99.99GΩ. This makes for easy IEC61730 -2 standard PV (solar battery) module insulation resistance testing.

Positive Electrode/Negative Electrode Insulation Resistance Testing

Automatic Testing Feature

Tests can be combined and configured to execute automatically over long periods of time. Automotic tests are composed of programs and steps, which can be configured to initiate one after another.

Automatic Testing Feature

Electric Discharge Function

A discharge feature enables discharge of electrical energy from the DUT after DC hipot and insulation resistance tests have completed. The setting range for discharge time is between 0.0s – 100.0s.

EARTH FAULT Protection

Mistakenly changing the grounding (GND) setting to “guard” (floating) can result in grounding the test subject which can result in unwanted leakage current emissions from the high voltage output site into the grounding site, resulting in electric shock to the operator. The EARTH FAULT protection function blocks output and terminates the test; eliminating any risk of electric shock and maximizing safety for the operator.

EARTH FAULT Protection

Offset Cancel

The Offset Cancel feature allows the user to eliminate electrical current found in the insulation resistance and stray capacitance among the output cables (only resistance for DC testing). This feature is available in all testing modes for AC withstanding voltage, DC withstanding voltage, insulation resistance, earth continuity and electrical current leakage tests.

Rise Time/Fall Time Control Function

The rise time control function prevents unnecessary stress from being applied to the EUT.

Rise Time/Fall Time Control Function

Basic Memory Function

In addition to automatic testing memory functions, up to 51 basic setting conditions and testing modes can be selected and saved to the main unit or USB memory. Easy testing with no hassle!

Basic Memory Function

Calibration Deadline Notification

A real-time clock IC has been equipped to ensure that the instrument is traceable via regular calibration. The device will automatically generate warning notifications when the calibration deadline is exceeded

SIGNAL I/O Connector

The rear panel also has a SIGNAL I/O that can start/stop operation as well as output signals.

SIGNAL I/O Connector

Exterior Design

Front panel

Front panel(TOS9303LC)

Rear panel

Rear panel (TOS9303LC)

Rear panel (TOS9301PD)

Display (Each menu screen)

Display (TOS9303LC)

Display (Each menu screen)


TOS9303 Outline


Electrical safety standard testing for automotive components

Compatible with both AC and DC, the TOS9303LC complies with a wide varety of safety tests for EV batteries, automotive charging devices and charging connectors. This “all-in-one” safety analyzer can meet the needs of nearly all automotive electrical safety standards.

Electrical safety standard testing for automotive components

PV (solar battery) module withstanding voltage/insulation resistance testing

Withstanding voltage tests such as IEC61730-2 and JIS C 8992-2 require testing voltage to be drastically increased (4 times the maximum system voltage + 2000V) and maintained for 1 minute.

PV (solar battery) module withstanding voltage/insulation resistance testing

Multi-channel withstanding voltage/insulation resistance testing

Multiple testing points can be simultaneously tested to cut costs and save time! The TOS9320 high voltage scanner allows for multi channel expansion for the TOS9300 series as well as previous models.

Multi-channel withstanding voltage/insulation resistance testing


High-Voltage Scanner TOS9320

High-voltage test lead

Lead for high voltage parallelconnection

High voltage test prob

DD-5P/9P DIN conversion cable required for connection with TOS9300 series.

Remote Control Box

>DD-5P/9P DIN conversion cable required for connection with TOS9300 series.

DIN Conversion Cable

Warning Light Unit

Rack Mount Bracket


Product Catalog

2D CAD Data

Outline | DXF 640.69 KB
Outline | PDF 126.04 KB

    Operation Manuals

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      Technical Data

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