HP 4155A, Руководство пользователя по задачам

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If Y ou Have A Problem
When Y ou Make A Measurement
If Measurement T akes More Time than Specied
When measuring current that is 10 A or less , SMUs may take longer time
to measure than the specied integration time . When measuring in a low
current range , the SMUs automatically take longer integration time to perform
accurate and stable measurements .
T o solve this problem:
Measure current using a xed range that is more than 10 A. The
measurement will be performed in the specied integration time .
If you set many measurement channels , measurement takes a longer time .
T o solve this problem:
Decrease measurement channels to reduce measurement time .
Note that the number of measurement channels automatically increases if
you do both the following: force voltage from channels that are connected
to R-Box and display the voltage values or use voltage values in user
functions . The channels automatically measure current, which is used to
compensate the voltage values .
If Measurement Damages the Device under T est
When performing breakdown measurements , DUT s may be damaged.
When voltage is forced from an SMU , the current is limited by the compliance
setting, which prevents the DUT from being damaged by a large current. But
when the current rapidly increases , the current limiter in the SMU cannot
follow the rapid current increase , so a large amount of current may ow
through the DUT for a moment, which may damage the DUT .
T o solve this problem:
Insert a protecting resistor as close as possible to DUT . Y ou can also use a
resistor of the HP 16441A R-Box.
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