Agilent Technologies B1500A Service Manual Page 334

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4-18 Agilent B1500A/B1505A Programming Guide, Edition 11
Command Reference
NOTE Measurement ranging (auto and limited auto)
The instrument automatically selects the minimum range that covers the
measurement value, and performs the measurement by using the range. For the
limited auto ranging, the instrument does not use the range lower than the specified
range value. For example, if you select the 100 nA limited auto ranging, the
instrument never uses the 10 nA range and below.
NOTE Before using 1 pA range
The measurement channel connected to the ASU (Atto Sense and Switch Unit)
supports the 1 pA range. To use the 1 pA range, set the 1 pA fixed range or the 1 pA
limited auto ranging.
To enable the 1 pA range for the auto ranging mode, execute the SAR command.
The Agilent B1500 automatically performs the compensation of the data measured
by the 1 pA range and returns the compensated data. You can use either the
pre-stored offset data or the pre-measured offset data.
To measure the offset data, execute the CA command before starting the
measurement for a DUT. The offset data is temporarily memorized until the B1500
is turned off.
range
Measurement resource type
Ranging type
UHCU HVMCU UHVU
0 Yes Yes Yes Auto ranging
1000, -1000, 14, or -14 Yes 100 V range fixed
30000 or -30000 Yes 3000 V range fixed
103 or -103 Yes 10 kV range fixed
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