
Agilent B1500A/B1505A Programming Guide, Edition 11 2-33
Remote Mode Functions
Measurement Modes
CV (DC bias) Sweep Measurements
CV (DC bias) sweep measurement is performed as shown below. The CMU
(capacitance measurement unit) applies DC bias with AC signal, and performs one
point measurement at each step of DC bias sweep. While the sweep measurement,
the AC signal level and frequency are constant.
Before performing the measurement, select the measurement parameters by using
the IMP command. And select the output data by using the LMN command.
Figure 2-20 CV (DC bias) Sweep Measurements
1. The CMU starts AC signal output by the FC and ACV commands.
2. The CMU sets the DC bias sweep output by the WTDCV, WMDCV, and WDCV
commands.
3. The CMU starts output by a trigger, such as the XE command.
4. After the hold time, the CMU waits for the delay time.
5. After the delay time, the CMU starts measurement.
6. After measurement, the CMU waits for the rest of the step delay time if it is set,
and the CMU changes the output value.
7. The B1500 repeats 5 and 6 for all sweep steps.
8. After the sweep measurement, the CMU forces the start or stop value, as
specified by the WMDCV command, and keeps it. The CMU also keeps the AC
signal output.
For 0 V output, enter the DZ command that is used to memorize the present
settings of the channel and change the CMU output to 0 V for both AC and DC.
DC bias
Stop value
Start value
Previous value
Time
: Measurement
Hold time
Step delay time
Trigger (e.g. XE)
WTDCV/WMDCV/WDCV/FC/ACV
Delay time
Step delay time
Delay time
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