Agilent Technologies B1500A Service Manual Page 122

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2-36 Agilent B1500A/B1505A Programming Guide, Edition 11
Remote Mode Functions
Measurement Modes
Pulsed Sweep CV Measurements
Pulsed sweep CV measurement is performed as shown below. The CMU
(capacitance measurement unit) applies pulsed DC bias with AC signal, and
performs one point measurement at each step of pulsed 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 2-23 Pulsed Sweep CV Measurements
1. The CMU starts AC signal output by the FC and ACV commands.
2. The CMU sets the pulsed bias sweep output by the PTDCV, WMDCV, and
PWDCV commands.
3. The CMU starts output by a trigger, such as the XE command.
4. After the hold time, the CMU starts measurement as shown in Figure 2-23. The
CMU performs measurement so that the pulse width and pulse period are kept.
5. After measurement, the CMU forces the pulse base value, and waits for the rest
of the pulse period. Then the CMU changes the output value.
6. The B1500 repeats measurement and 5 for all sweep steps.
7. After the pulsed sweep measurement, the CMU forces the pulse base value, 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
Pulse period
Trigger (e.g. XE)
PTDCV/WMDCV/PWDCV/FC/ACV
Pulse base value
Pulse width
Pulse period Pulse period
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