95x Series Operating Manual - May 17, 2022
Page
75
of
155
•
DISCHARGE
. During this period, the DUT is discharged as fast as possible.
NOTE
–
the actual reported test current in breakdown may be slightly higher than expected because of the
characteristics of the breakdown of the DUT. If this is excessive then the user should select a slower maximum
ramp rate.
CONFIGURING
An example BRKDN menu is as follows
–
Seq 1 Step 1 BRKDN
CURRENT: 5.000mA
RAMP: 5.00KV/s
Lim: 800.0-850.0V
ON FAIL: ABORT SEQ
•
DUT GROUNDED
. Only available if option HSS or HSS-2 is installed. This selection allows the user to
select either
–
o
NO.
This selection indicates that the DUT is isolated from ground, the 95x will use the current in
the
RETURN
terminal to detect breakdown. This is as if option
HSS
or HSS-2 were not installed.
o
YES
. This selection indicates that the DUT is grounded, the 95x will use the current in the
HV
terminal to detect breakdown.
•
CURRENT
. Allows the DC test current to be programmed. The entry is limited to be a minimum value of
1uA.
•
RAMP
. Allows the maximum ramp rate to be programmed.
o
The accuracy of the breakdown voltage measurement may be limited by the ramp rate at high
rates. It is not recommended to set ramp rates of more than 10 times the lowest expected
breakdown voltage per second (e.g., if the lowest expected breakdown voltage is 500V then the
highest recommended rate setting is 5000V/s).
o
If the DUT and cables connected to it have any significant capacitance then a significant portion
of the test current may be consumed by the charging current. In this case the DUT will be
measured as having a considerably lower breakdown voltage than expected. The user should
consider using a lower maximum ramp rate setting in these circumstances.
•
Lim
. This allows the user to define the range within which the breakdown voltage measurement is
considered a PASS.
•
ON FAIL
. This allows the user to program the 95x to abort the entire sequence (ABORT SEQ) or only this
step (CONT SEQ) if this step fails any of its checks. A safety related failure or a user abort (
STOP
button)
always aborts the entire sequence.
CONNECTING TO THE DUT
for general wiring and safety recommendations.
The 95x requires that the DUT (at least that portion which is being measured) is isolated from ground unless
–
•
Option HSS or HSS-2 is fitted
•
And, the DUT GROUNDED setting is set to YES.
TESTING A DUT WITHOUT OPTION HSS, WITHOUT OPTION HSS-2, OR WITH DUT GROUNDED SET TO NO
The DUT should be wired between the
HV
and
RETURN
terminals of the 95x.
