Hipot Tester / Hipot Tester with Insulation Resistance Test



270,000 (税込:297,000

  • The PWM amp system provides highly-stable output
  • Max. output-voltage of AC hipot testing : 5kV/100mA(500VA)
  • Max. output-voltage of DC hipot testing : 6kV / Max. output 50W
  • High-precision measurement ±1.5% of reading (with voltmeter 500 V or higher, Ammeter 1 mA or higher)
  • Rise/Fall time control function
  • The Keylock function & the Protection cover for the front panel operation
  • Equipped with USB / RS232C interface

High voltage caution


What is myKIKUSUI?

SKU: TOS5301
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Simple! Secure! Safety! A new standard for Hipot & Insulation resistance testing Applied to World-Wide input voltage

The “TOS5300 Series” is a series of test instruments used in Hipot tests and insulation resistance tests, two of the four tests regarded as necessary for ensuring the safety of electrical products. With an output of 5 kV/100 mA (AC) and 6 kV/10 mA (DC), the series can be used in Hipot & insulation resistance testing of electronic equipment and electronic parts, based on the requirements of IEC, EN, UL, VDE, JIS, and other international safety standards and the Electrical Appliance and Material Safety Law.

Also, the test voltage stability is improved with the adoption of a newly developed switching amplifier. Since the output voltage can be kept constant even when the AC line voltage or frequency changes, consistent testing can be performed, even when the power supply environment is in an unstable region. The TOS5300 is also equipped with a number of features that are capable of meeting a variety of test needs. It is a new low-cost standard model that provides thorough operability, reliability and safety.

The achievement of AC Hipot testing with a constant stable output! ⟨ Input voltage variation : ± 0.3% ⟩

The achievement of AC Hipot testing with a constant stable output!

The output waveform is essential factor in Hipot(Withstanding voltage) testing!

A conventional Hipot (Withstanding voltage) tester boosts and outputs the AC line’s input voltage through the use of a slide transformer. With this slide transformer system, input voltage fluctuations will affect the output, preventing tests from being performed properly. At times, the application of distortion voltage applied to the EUT may cause a failure of new product(accelerating a deterioration of components).

Since the TOS5300 Series equips with a high-efficient PWM amplifier that can output a stable high-voltage without being affected by the variation of AC power line, users can perform “safe”, “stable”, and highly “reliable” tests with confidence, even in regions with large voltage variations.

New design of output terminal improves safety and functionality

Eliminates the projected components from the front panel. The new design of LOW terminal.

Eliminates the projected components from the front panel. The new design of LOW terminal.

In consideration of safety for the operator and the environment, the output terminal of HIGH-side has been placed in the most distant location from the control area. The free rotation machanisim protects from twisting (or breaking) of the cable. Also, with having the lock function for the LOW terminal on the main unit, the metal plate is no longer attached to the test lead of LOW-side, and it makes to resist damage to the test lead. Because of elimination of these projected components, the TOS5300 can avoid from unexpected accidents such as when the unit travels to other location. And also when the test lead is snagged on something, or unexpected stress is applied on the test lead, the High (High-voltage) test lead is designed to disconnect easily, but the Low (ground) test lead is designed to resist disconnection.

There are also measures to prevent accidental insertion.

In order to prevent the insertion error, the color coding of the cable are classified to HIGH (red) and LOW (black) , and the plug shape of terminal are also different design.

Realizing high-precision measurement with high-resolution and high-speed judgement

 AC Hipot (Withstanding voltage) test settings display (example)

Equipped with a high-accuracy, high-resolution of True RMS measurement circuit, including a Voltmeter with ± 1.5 % of reading (500V or greater) / minimum resolution of 1V, and an Ammeter with ±1.5 % of reading (1mA or more) / minimum resolution of 1 μA. In addition, it is also equipped with an Auto range function.

The Lower limit judgment accuracy achieves a level of performance equivalent to the Upper limit judgment accuracy that enables to detect for such a poor contact or disconnections of test leads. Moreover, it realizes the fast judgment by the test time of 0.1 second, while reliable testing can be performed, thanks to high-precision, high-resolution, high-speed measurement and the judgment functions.

Protection cover prevents physical operation error in the production site

Prevents a physical operation error by installing the protection cover on the control keys.

View with the protection cover removed

In many cases, workers on electronic equipment production lines and inspection lines are not technical experts. Therefore, it is possible that the operators may change setting conditions and make operation errors. In order to prevent from such cases, the TOS5300 is equipped with a key lock function and a protection cover to disable a physical key operation from the front panel.

Storing the protection cover for the key operation to the base of unit.

During the periods of operation with the protection cover removed, such as when the test conditions are frequently changed and tests are performed repeatedly, the protection cover can be stored at the base.

Rise time / Fall time control function

Rise time / Fall time control function

Rise time control function

The Rise time control function enables you to increases the test voltage gradually to reach the setting voltage while the AC Hipot (Withstanding voltage) test is conducted. The voltage rise time can be set from 0.1s to 10.0s at a resolution of 0.1s.

Fall time control function

The Fall time control function enables you to decrease the test voltage gradually when the PASS judgment is made at the AC Hipot (Withstanding voltage) test. The voltage fall time is fixed at 0.1s. (OFF is also selectable).

Examples of Safety Standards (Routine Tests)

IEC60950 / J60950 – Information processing equipment

The test voltage applied to the insulation part should be increased gradually from zero to the specified voltage, then hold at the specified voltage for 60 seconds.

IEC60335 / J0335 – Home appliances

The initial test voltage should be applied less than half of the specified voltage, then gradually increase to the specified voltage.

IEC60065 / J0065 – Audio/video

The initial test voltage should be applied less than half of the specified voltage, then rapidly increase to the specified voltage and hold for 1 minute.

IEC61010/JIS C 1010 – Measurement equipments

Avoids any detectable transient phenomenon, the test voltage should be increased gradually to the specified voltage within 5 seconds, then hold at the specified voltage for 5 seconds.

Necessity of the rise time control function

Start voltage can be set at 50 % of the test voltage.

The rise time control function is to prevent the EUT (test object) from being exposed to stress that exceeds the required amount. The Hipot (Withstanding voltage) test is conducted to verify the safety performance of the EUT and which test voltage for Hipot (Withstanding voltage) test is applied approximately five to ten times greater than the voltage that handles by the EUT. If a high voltage is applied rapidly with no rise time, the transitional large voltage (current) will be occurred, and it may cause a damage to the EUT. If, as a result of the test, the EUT is suffered of the insulation (dielectric) breakdown, the failure of defect can easily be identified without any problem. However, when breakage is occurred partially, it becomes hard to identify the problem.

In other words there are cases in which “at a glance, a Hipot (Withstanding voltage) test appears to have been successfully passed, however, the fact is found that the insulation performance has degraded.” In such cases there is a potential risk of danger that the insulation failure will occur after the EUT has been released into the market as a commercial product. The result of testing performed to confirm safety may cause the loss of product’s safety. For this reason, safety standards stipulate the procedure of Hipot (Withstanding voltage) test, and the test voltage must be gradually increased to the specified voltage when the test is performed.

The rise time control function adopted in the in the TOS5300 Series can set the voltage rise time from 0.1s to 10.0s (at a resolution of 0.1s) and also it is capable to set the 50 % (fixed) of the applied test voltage. In addition, the fall time control function enables to decrease the test voltage gradually after the completion of a PASS judgement. The voltage fall time is fixed at 0.1s (OFF is also selectable).


6 kV/50 WDC Hipot (Withstanding voltage) test

Capable to perform DC Hipot (Withstanding voltage) test up to 6kV. (Model TOS5301) Equipped with a stable DC/DC converter with a low-ripple and the load variation of 3% or less.

Insulation resistance test for 25V to 1000V *

The TOS5302 is equipped with an insulation resistance tester. The test voltages can be set from 25V, 50V, 100V, 125V, 250V, 500V and 1000V. And for setting at 500V and above, it can perform the insulation resistance test up to 5.00GΩ.

*At 500V and above, measurements up to 5.00GΩ are possible.

Reducing the tact time

Reduction of the tact time leads to improve the productivity. However, it has been an issue that reducing the tact time may cause to worsen the measurement accuracy when the test time is faster than the measuring response speed. The TOS5300 series has been achieved to set the test time from 0.1s.

Supporting the World-wide input voltage

Usable globally! Usable in any country, without changing the input power supply.

Selectable output frequency! The instrument not rely on the input power environment. Supplying the stable test voltage with 50 / 60 Hz frequencies.

Lightweight & Compact design

Weighs Approx. 15kg 40% lighter than conventional models

*Compared to TOS5300 and TOS8870A

Monitoring the output voltage and protection when applying an overvoltage by the operation error


Prevents the user from setting a test voltage that exceeds the preset voltage.

Monitoring output voltage function

If the output voltage exceeds the setting voltage of (± 350V), it turns off the output and the system switches to PROTECTION mode. In order to handle kilo’s of high voltage when the Hipot (Withstand voltage) and insulation tests are conducted, there are number of safety measures are required to take place. Having with these functions improve, the operational safety and the protection for the EUT.

LIMIT VOLTAGE setting (example)

Interlock feature

The product is equipped with an interlock function that operates together with external devices to interrupt output. To ensure the safe operation of tester, the interlock function activates when the SIGNAL I/O connector pins number 1 and 13 are opened, and when they are short-circuited, the interlock function is released.

Interlock circuit

Upper limits / Lower limits setting function

It automatically detects connector lead breaks and disconnections of wiring by measuring extremely small amounts of current that flows when voltage is applied to the EUT.

Example setting display of Upper limit, Lower limit, and Test time

Calibration due notice and Warning function

To assure the traceability of periodic calibration of the product, this function gives a notice of calibration due managed by the builtin real-time clock. Even if the due data has elapsed, it is possible to avoid the oversight of operator with limiting the operation with a display of warning message.

Example setting display of Calibration due

Discharge feature

Equipped with a forced discharge function that forcibly discharge the electricity which has been charged in the EUT after the completion of DC Hipot (Withstanding voltage) test or insulation resistance test.

Easy setting of test conditions with panel memory feature!

To set the test conditions such as test voltage, judgment value and test duration, simply press a key and turn the knob on the front panel. The test conditions can be saved in the panel memory (3 sets).

REMOTE connector & USB interface

Equipped with the REMOTE connector and USB interface on the front panel are exclusive use for the options. Easy connection with the PC.

SIGNAL I/O Connector

The rear panel is equipped with SIGNAL I/O that provides functions such as start and stop operation and signal output.

SIGNAL I/O Connector


TOS5301 Outline


Application (Data Acquisition for TOS5300)

Data Acquisition for TOS5300 is a software product that lets you collect and manage test results generated by our TOS5300 Series hipot and insulation resistance testers. Also, Data Acquisition for TOS5300 allows you to save, search, and print data with ease. What’s more, you can execute or stop the test through a simple operation using a PC.

TOS5300 | Data Acquisition for TOS5300

  • Data Acquisition for TOS5300 can be used with TOS5300 Series (TOS5300, TOS5301, or TOS5302) testers with firmware version 1.22 and later.
    * If the firmware is earlier than 1.22, it must be updated. Information on updating firmware, please contact us.

Please feel free to contact us with any questions or concerns.

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