
2-38 Agilent B1500A/B1505A Programming Guide, Edition 11
Remote Mode Functions
Measurement Modes
C-f Sweep Measurements
C-f sweep measurement is performed as shown below. The CMU (capacitance
measurement unit) applies AC signal with DC bias, and performs one point
measurement at each step of AC signal frequency sweep. While the sweep
measurement, the AC signal level and the DC bias 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 2-24 C-f Sweep Measurements
1. The CMU sets the AC signal frequency sweep output by the WTFC, WMFC,
and WFC commands.
2. The CMU starts AC signal/DC bias output by the ACV and DCV commands.
3. The CMU starts frequency sweep 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 AC signal frequency.
7. The B1500 repeats 5 and 6 for all sweep steps.
8. After the sweep measurement, the CMU keeps the signal output of the AC signal
frequency’s start or stop value as specified by the WMFC command.
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.
Frequency
Stop value
Start value
Previous value
Time
: Measurement
Hold time
Step delay time
Trigger (e.g. XE)
WTFC/WMFC/WFC/ACV/DCV
Delay time
Step delay time
Delay time
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