User`s guide

Agilent 4155C/4156C User’s Guide Vol.2, Edition 6 7-33
Measurement Units and Functions
Measurement Ranging Mode
Enhanced Auto Ranging for Current Measurement
Expanded functions are available for the auto ranging operation of the current
measurement channels. To use the functions, set the AUTO RANGING MODE
fields (MODE and RATE) on the SYSTEM: CONFIGURATION screen. This
setting is effective for all of the current measurement SMU.
MODE Auto range operation mode. 1, 2 or 3. See below. Initial setting
is 1.
RATE Value used to calculate the current value shown below. 11 to
100. Initial setting is 50.
• MODE=1:
Performs normal auto ranging operation.
• MODE=2:
If the following condition is satisfied, the range changes up after measurement.
Measurement value ≥ current1
• MODE=3:
If the following condition is satisfied, the range changes down immediately,
even during measurement.
Measurement value ≤ current2
If the following condition is satisfied, the range changes up after measurement.
Measurement value ≥ current1
where current1 and current2 are given by the following formula.
current1 = Range × RATE/100
current2 = Range × RATE/1000
For example, if the range value is 10 mA and RATE is 90, they are:
current1 = 9 mA
current2 = 0.9 mA