Agilent Technologies 4156b, Руководство пользователя

Страница: 129 / 414

Agilent 4155B/4156B User’s Guide Vol.2, Edition 5 3-55
Measurement Functions
Measurement Ranging Mode
Limited Auto Ranging
Limited auto ranging is similar to the auto ranging. But the limited auto ranging
does not use the range(s) less than the range you specified. For example, if you
select the 10 nA limited auto ranging, measurement unit does not use the 1 nA range
or less. So the measurement time for limited auto ranging is less than for auto
ranging.
Monitor unit automatically searches for and measures at measurement range that
provides highest resolution (but is not below the specified range) as follows:
V measurement
The unit changes ranges (up or down one range at a time, but not below specified
range) until the measurement value is between 10 % and 110 % of the range, then
the unit performs the measurement.
If the specified range is greater than the lowest range that contains V compliance,
the measurement is performed at the lowest range that contains V compliance.
I measurement
If specified range is greater than the lowest range that includes I compliance, an
error occurs.
• 1 A to 1
m
A
The unit changes ranges (up or down one range at a time, but not below
specified range) until the measurement value is between 10 % and 114 % of the
range, then the unit performs the measurement.
If the measurement value is less than 1 % of the present range, and if present
range is 100
m
A or higher range, and if the present range is two or more ranges
above the specified range, the range changes down two ranges instead of one
range.
• 100 nA to 100 pA
The unit changes ranges (up or down one range at a time, but not below
specified range) until the measurement value is between 10 % and 114 % of the
range, then the unit performs the measurement.
• 10 pA
The unit changes to the next higher range when the measurement value exceeds
104% of the present range.