95x Series Operating Manual - May 17, 2022
Page
76
of
155
The 95x provides a safety ground termination for the DUT during the test via its
RETURN
terminal. When deciding
which point on the DUT to connect to the
HV
terminal and which point to connect to the
RETURN
terminal, the
user should consider that only the voltage on the
RETURN
terminal is safe at all times.
TESTING A GROUNDED DUT (OPTION HSS OR HSS-2 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 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.
LEAD COMPENSATION
Performing a lead compensation for this type of test step has no affect; the test step is performed normally during
lead compensation mode.
EXAMPLES
A MOV is to be tested against its breakdown specifications. The specifications are at a current of 10mA the
breakdown voltage shall be between 405 and 495V. The specifications state that a maximum ramp rate of
100000V/sec is to be used. The MOV has <1000pF capacitance.
This is achieved by using a single test step as follows -
Seq 1 Step 1 BRKDN
CURRENT: 10.00mA
As required
RAMP: 2.00KV/s
As recommended (<10*Vmin/sec)
Lim: 405.0-495.0V
As required
ON FAIL: ABORT SEQ
The total test time will be less than 350ms. After the sequence is run the actual highest voltage and load current
are available for review.
SPECIFICATIONS
Specifications are as for the DC Voltage Withstand Test types except as shown below.
The BRKDN type must not be used with loads having >0.05uF capacitance.
HV
RETURN
SENSE+
95x
DUT
High Voltage Wire
Low Voltage Wire
