I finished my first attempt to construct a home made ESD gun. The grill starter would put out about a 1A 5ns wide pulse was all but the open circuit voltage was around 15ish KV. The gun starts with a regulated 4.0KV supply and I plan to again only do direct contact assuming I get something that works well enough.
Again, my home made 2 ohm target is attached to the scope with a 26dB attenuator and about a meter of RG400. So for example, 100mV would be about an ampere. The standards don't really cover the open circuit waveforms. They want 15A in that sub ns range. Then decay to roughly 8A in 30ns and 4A in 60ns.
There is some risk playing around with this gun. The LeCroy 64xi display will flicker then there is always the stupid USB problems. The 64xi does not have near enough top end to see what is really going on but I don't like playing with the faster scope while I am working out the design. So here are the first waveforms off it. At about 60ns the scope is showing 350mV or about 3.5A. Construction is pretty poor right now but it's already looking better than the grill starter.
I was digging into that first test report where they tested the meter without the leads. Looking at the EN 61326-1:2013
3.11
port
any particular interface of the specific device or system with the external electromagnetic
environment
EXAMPLE See Figure 1 for an example of Equipment Under Test (EUT).
Note 1 to entry: I/O ports are input, output or bi-directional, measurement, control, or data ports.
Note 2 to entry: Within this document, ports intended to be connected with earth potential for functional reasons
(functional earth ports) are considered as I/O ports
Note 3 to entry: Within this document the protective earth port (if any) is considered as part of the power port.
5.2.4 I/O ports
Where there are multiple I/O ports, which are all of the same type, connecting a cable to just
one of those ports is sufficient, provided that it can be shown that the additional cables would
not affect the results significantly.
If not otherwise specified in more specific parts of the IEC 61326 series, electrostatic
discharges shall not be applied to inner pins of plug-in ports or cable connectors (but to
connected connectors accessible during the intended use of the EUT).
6.4.3 Performance criterion B
The equipment shall continue to operate as intended after the test. No degradation of
performance or loss of function is allowed below a performance level specified by the
manufacturer, when the equipment is used as intended. The performance level may be
replaced by a permissible loss of performance. During the test, degradation of performance is
however allowed. No change of actual operating state or stored data is allowed. If the
minimum performance level or the permissible performance loss is not specified by the
manufacturer, either of these may be derived from the product description and documentation
and what the user may reasonably expect from the equipment if used as intended.
IMO, that first reports ESD test was pointless and did not follow the sprit of the standards.