95x Series Operating Manual - May 17, 2022
Page
51
of
155
The example above shows the connections to a DUT to perform both an AC withstand test on the Line/Neutral line
power input, and an AC Ground Bond or DC Low
Ω
test on the chassis of the DUT in the same sequence. If wired in
this manner, then no changes in connections are needed. This will increase the capacitive coupling between the
HV
wire and the other wires, which may need to be compensated for in highly sensitive applications. The
Continuity Sense feature may also be used with this wiring configuration.
The example above shows the connections for performing an ACCAP type step to check a capacitor for value and
breakdown.
TESTING A GROUNDED DUT (OPTION HSS ONLY)
In this case the user only need connect the
HV
terminal of the 95x to the point on the DUT which is to be tested. It
is expected that the DUT is grounded and that the breakdown and/or leakage is being tested to ground. For safety
reasons or if unsure if the DUT is grounded, it may be desirable to also connect the DUT ground to either the
RETURN
or
GUARD
terminals of the 95x, however the user should ensure that the ground of the 95x and that of
the DUT are within 5Vrms of each other otherwise excessive ground loop currents may flow, potentially damaging
the 95x.
It should be noted that the 95x will measure the leakage current to ground from the
HV
terminal and the wiring in
addition to the leakage current in the DUT itself. Particularly when performing AC Withstand testing, the wiring
leakage current may be large because of capacitance between the wiring and nearby grounded objects or surfaces.
SOURCE-
HV
RETURN
SENSE+
95x
DUT
High Voltage Wire
L
N
High Current Wire
Low Voltage Wire
HV
RETURN
SENSE+
95x
DUT
High Voltage Wire
Low Voltage Wire
