
Agilent B1500A/B1505A Programming Guide, Edition 11 2-31
Remote Mode Functions
Measurement Modes
Pulsed Spot C Measurements
Pulsed spot C measurement is performed as shown below. The CMU (capacitance
measurement unit) applies pulsed DC bias with AC signal, and performs one point
measurement.
Before performing the measurement, select the measurement parameters by using
the IMP command. And select the output data by using the LMN command.
Figure 2-19 Pulsed Spot C Measurements
1. The CMU starts AC signal output by the FC and ACV commands.
2. The CMU sets the pulsed output by the PTDCV and PDCV commands.
3. The CMU starts output by a trigger, such as the XE command.
4. The CMU starts measurement as shown in Figure 2-19. 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 keeps it. The
CMU also keeps the AC signal output.
If the next trigger occurs within the pulse period, pulse output is as follows if the
trigger interval is longer than several 10 ms.
• If the rest of the pulse period is longer than the hold time as shown in Figure
2-19, the CMU waits for the rest, then starts the pulse output.
• If the rest of the pulse period is shorter than the hold time, the CMU waits
for the hold time since the last trigger, then starts the pulse output.
DC bias
Pulse value
Base value
Previous value
Time
: Measurement
Hold time
Pulse width
Pulse period
Hold time
TriggerTrigger (e.g. XE)
Pulse period
PTDCV/PDCV/FC/ACV
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