95x Series Operating Manual - May 17, 2022
Page
74
of
155
LOAD CURRENT MEASUREMENTS
Measurements are performed in the
RETURN
terminal of the 95x.
Breakdown Current
1uA to 280mApk (DC-50kHz bandwidth)
<(± 1% ± 1uA) accuracy
<30usec detection time
<3msec response time (typically <500usec)
Arc Current
1 to 30mArms (50KHz-5MHz bandwidth)
<(± 10% ± 1mA) accuracy at 1MHz
4us, 10us, 15us, 20us, 30us or 40us measurement period
TEST TIMING
The ramp and dwell times are those specified ± 100us
DC BREAKDOWN VOLTAGE DEVICE TESTING (BRKDN)
This tests that a DUT exhibits breakdown when tested with a user set DC current. The measured breakdown
voltage is checked against an allowable range.
The BRKDN type is commonly used for testing high voltage protection devices such as spark gap surge arrestors
and MOV style voltage limiters.
ACTIONS WHILE RUNNING
•
RAMP
. During this period, the test voltage is ramped at the user set maximum ramp rate to an
automatically selected voltage level between 50 and 90% of the minimum breakdown voltage limit
setting. If the user set breakdown current limit occurs during this period, then the DUT is failed, and the
highest voltage and current are recorded, and the DISCHARGE period is started (i.e., the SEARCH period is
skipped).
•
SEARCH
. During this period, the test voltage is ramped at an automatically selected slower rate than
during the RAMP period. The search ramp rate is selected to give best accuracy within the set breakdown
voltage limits. If the user set breakdown current limit occurs during this period, then the highest voltage
is recorded as the DUT breakdown voltage, and the DISCHARGE period is started. If a voltage significantly
higher than the maximum breakdown voltage limit is reached before the load current achieves the user
breakdown current limit, then the DUT is failed, and the final voltage and current are recorded, and the
DISCHARGE period is started.
V
O
LTAG
E
TIME
RAMP
SEARCH
DISCHARGE
