User`s guide

2-6 Agilent 4155C/4156C User’s Guide Vol.2, Edition 6
Knob Sweep Measurements
Measurement Functions
Step Time
Step time is the time width of a sweep step as shown in the following figure. For
knob sweep measurements, you cannot set the delay time. Instead, you set the step
time, which you can only set on the KNOB SWEEP screen.
Setup range is 0.5 ms to 100 ms, with 100 μs resolution.
For normal sweep measurement, the step time depends on the measurement time.
For knob sweep measurement, step time is always this specified value.
Measurement Channel
You select the measurement channel by selecting the Y-AXIS ASSIGN softkey on
the KNOB SWEEP screen, then selecting the desired secondary softkey. You can
select one measurement channel only, so the Y2 axis is not available on the KNOB
SWEEP screen.
• default measurement channel
• When an SMU is set to VAR1
Measurement channel is the VAR1 channel.
• When a VSU is set to VAR1
Measurement channel is the first found channel that can measure. Searching
order is:
SMU1 → .....→ SMU6 → VMU1 → VMU2.
• restrictions
If you use series resistance for VAR1 channel and VAR1 channel is V force
mode, only VAR1 measurement channel can be assigned to Y axis.
NOTE Measurement Resolution
When performing knob sweep measurement, measurement resolution of each
measurement unit is worse than the measurement resolution of normal sweep
measurements.