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ESDGuns.com GRC Series Ground Cable w/ 470k Ohm Resistors for ESD Voltage Bleeding

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The indirect discharge part of ESD immunity test uses two planes, known as the vertical coupling plane (VCP) and the horizontal coupling plane (HCP) and coupled to the ground reference plane (GRP). The HCP remains in place under the EUT during the direct tests, the VCP to be placed at a 10 cm distance from the EUT. Each coupling plane requires a connected to the GRP by the ESDGuns.com GRC resistor lead, to ensure that any charge bleeds off within a few microseconds. The construction of these leads is critical: there should be a resistor close to each end, so that the length of lead between them is isolated from the connections and stray coupling to it is neutralized. Although power rating is unimportant, the resistors themselves should withstand a high pulse dv/dt without breaking down, for which low inductance carbon composition types are best suited.

The ESDGuns.com GRC Resistor Cables are ideal for bleeding voltage during ESD immunity testing to IEC 61000-4-2ISO 10605DO-160 Section 25Mil-STD CS118  and virtually every other compliance standard. Using high quality components and built in the USA, ESDGuns.com is the only stocking manufacturer of these ESD cables/leads, making them immediately available at an economic price.

The GRC ground cables are offered with metal oxide and precision HV 470k Ohm bleeder resistors. Both are suitable to withstand a high pulse dv/dt without breaking down. Precision HV resistors are more resilient and will last much longer.

High Voltage Cables:

High voltage cabling rated to 20kV exceed the test levels called out for IEC 61000-4-2 test levels. Alternatively, high voltage cabling rated to 40kV exceed the voltage output of any portable ESD simulator rated to 30kV.

Which GRC Resistors Should I Pick?

ESD testing is difficult to keep consistent from day to day (temp/humidity), to user (test technique), and a variety of other factors. While it's our experience and view the indirect ESD dissipation via GRC cables have an insignificant impact on test results, it's possible others feel different. The primary difference between resistor types will be longevity of the resistor life.

Other Considerations:

  • Frequency of ESD testing: If you are an all day, every day ESD immunity test lab, precision HV is the most suitable route. Do you test and debug once a day, once a week or less? Metal oxide may be suitable.
  • Type of testing, precompliance or compliance: Just troubleshooting and debugging, looking to get an idea how your product will perform? Metal oxide resistors should suffice, of course the ESD dissipatition will be more consistent with Precision HV resistors.
  • Environment of storage and conditioning: Metal oxide resistors will be suitable in climate control labs. If the GRC cables are exposed to large swings in temperature and humidity, consider Precision HV resistors for consistency and longevity.
  • Concern for accuracy and consistency: By now, you have a good idea. We've had customers who look to improve all areas of ESD testing because their products achilles' heel is ESD. Philosophically, repeatability in ESD may or may not help resolve real world ESD failures.

ESDGuns.com offers a 2-Year warranty on the precision HV resistors and a 1-Year warranty on metal oxide resistors.

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