ESS FAQ

The EUT should be discharged before each individual discharge application. If the EUT remains charged, the voltage difference between the EUT and the ESD gun test voltage becomes smaller, which may result in an insufficient discharge current and inaccurate test results.

Direct discharge is a method of applying an electrostatic discharge directly to the EUT using either contact discharge or air discharge. Indirect discharge is a method of applying an electrostatic discharge to a Horizontal Coupling Plane (HCP) or Vertical Coupling Plane (VCP) by contacting the plane with the round tip of the discharge electrode.

Please perform the test while holding the grip of the ESD gun with one hand. If you support another part of the ESD gun, such as the gun body or discharge cup, with your other hand, the influence of human body capacitance may change the output waveform (increase the peak current, Ip), which may affect the test results.

Yes, it is safe. Do not connect the ground cable of the ESD gun to the EUT. Connect it to the ground plane as usual. Connecting the ground cable to the EUT may cause a short circuit or damage the power supply of the ESD simulator.

To verify the current waveform, optional accessories required for waveform verification, such as the Current Waveform Target (06-00094A) and Target Mounting Plate (03-00118A, 03-00119A), must be prepared. Please contact us for more details.

The first peak of the current waveform is formed by the parasitic capacitance between the ESD gun and the target mounting plate. Since the compact version has a smaller surface area than the IEC standard version, the first peak may be slightly lower than the value specified in the standard. The second peak is affected by the routing of the discharge return cable. According to the standard, the cable is extended backward from the target at a distance of 0.5 m. However, the compact version does not allow the same cable arrangement, which may result in changes to the waveform around the second peak.

Let X be the voltage value measured on the oscilloscope (unit: V). The peak current value is calculated using the following formula: Peak current (A) = X × 10 (20 dB) × 10 (20 dB) ÷ 2 Ω (target resistance) Example: When applying 2 kV and the oscilloscope displays 0.15 V 0.15 V × 10 × 10 ÷ 2 Ω = 7.5 A According to the standard, the peak current at 2 kV discharge should be 7.5 A ±15%.

It is unlikely that cleaning the discharge tip will restore the discharge function. The purpose of cleaning is to maintain the insulation performance of the resin housing. If the insulation performance is reduced due to contamination or other factors, especially in high-temperature and high-humidity environments, the insulation resistance decreases. As a result, charge may leak from the high-voltage section of the ESD gun to the gun GND, preventing the charging voltage from being maintained. The resin cover of the discharge tip is considered less critical for preventing charge leakage for the following reasons: ・　A conductor passes through the center of the discharge tip. ・　The discharge tip is screwed into the gun body, and the creepage distance from the threaded section is shorter than that through the resin cover.

The cable length between the GT-31S ESD gun and the ESS-PS1 ESD simulator is approximately 2 m. The cable length between the GT-30R ESD gun and the ESS-S3011A ESD simulator is also approximately 2 m.

The difference is the type of ESD gun that can be mounted. 03-00128A: Compatible with both the GT-30R series and GT-31S 03-00061B: Compatible with the GT-30R series only There is no difference between these holders related to the edition of IEC 61000-4-2.

The discharge current waveform shows almost no change between EXTRA mode and NORMAL mode.

Yes, it can be installed. Please note that the PS-806 has been verified with GT-30R series ESD guns and earlier models. The center of gravity balance with the GT-31S, which is heavier, has not been verified. Take appropriate precautions to prevent the stand from tipping over.

Yes, it is possible. The ESS-PS1 is tested while charging when the AC adapter is connected during measurement.

Yes, the internal battery is charged while the ESS-PS1 is connected to AC power.

The following are reference values for battery operating time: At a test voltage of -30 kV with 20 discharges per second: approximately 3 hours At a test voltage of -8 kV with 1 discharge per second: approximately 8 hours

Under an ambient temperature of 25°C (77°F), after 300 charge and discharge cycles (100% charge → 0% discharge → 100% charge), the battery capacity will be approximately 75% of its original capacity. The battery can also be replaced separately. Please contact us for more information.

Yes, the Insulation Support (03-00066A) complies with ISO 10605 Ed.2. However, it does not comply with ISO 10605 Ed.3. In Ed.3, it has been replaced by the Insulation Block (03-00054A). Please consider purchasing the Insulation Block (03-00054A) for compliance with the latest edition.

The connection cable (gray cable) between the ESD gun and the simulator can be extended by using the Extension Cable (05-00047B). The return cable can also be extended to 3 m as a custom modification. In this case, the ESD gun you own must be returned to us for modification. If a single long return cable is not required, you may also prepare your own extension cable for the return cable. Please note that any cable extension method is outside the scope of compliance with IEC 61000-4-2 and ISO 10605, and the waveform performance is not guaranteed.

The estimated service life of the high-voltage relay in the ESD gun depends on conditions such as the capacitance and resistance values of the charge/discharge circuit, output voltage, and discharge repetition interval. For example, when using a 150 pF / 330 Ω CR unit and outputting 30 kV at a repetition rate of one discharge per second, the estimated service life is approximately 400,000 operations.

No specific withstand voltage rating has been defined for this cable. However, it can be used within the test range specified by IEC 61000-4-2. Therefore, applying up to 15 kV using a 150 pF / 330 Ω CR unit is possible without any issues.

Our ground plane (03-00007A) consists of three plates, each measuring 1.8 m × 1.0 m. According to IEC 61000-4-2, the ground plane must extend at least 0.5 m beyond all sides of the EUT or the Horizontal Coupling Plane (HCP). Therefore, if the EUT width is 2.0 m, a ground plane width of 3.0 m is required (2.0 m + 0.5 m on the right side + 0.5 m on the left side). If necessary, this requirement can be met by preparing two or more sets of the ground plane (03-00007A).

The metal parts of the Probe Stand are made of SUS303 stainless steel. The white handle section (ESD gun holding part) is made of POM (polyacetal resin), an engineering plastic.

“Pass” is displayed when the measured output voltage is within ±5% of the set voltage value. The voltage output is checked in the following sequence: +0.2, +2, +4, +6, +8, +15, +25, +30 kV → -0.2, -2, -4, -6, -8, -15, -25, -30 kV.

The supplied standard power cable is rated for AC 100 to 240 V. Please connect the power cable to an AC outlet equipped with a protective earth (PE) terminal.

The fuse holder is located at the AC inlet on the rear panel of the ESD simulator, and the fuse can be replaced by the user. For information on the recommended fuse, please contact us.

The ESS-S3011 recognizes the external trigger signal within approximately 15 to 25 ms. After an additional delay of approximately 10 ms caused by the mechanical contact (relay), the discharge starts. The gun trigger operates in the same manner.

If the resistor were placed in the middle of the cable, the cable itself could act as an antenna and generate radiated noise. By installing resistors at both ends of the cable, the cable does not act as an antenna source, which helps prevent radiated noise from the cable.

The chassis ground and the return cable are separated at high frequencies because a ferrite core is inserted between them. However, they are at the same potential under DC conditions.