Agilent Technologies B1500A Service Manual Page 116

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2-30 Agilent B1500A/B1505A Programming Guide, Edition 11
Remote Mode Functions
Measurement Modes
Spot C Measurements
Spot capacitance measurement is performed as shown below. The CMU
(capacitance measurement unit) applies 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 2-18 Spot C Measurements
1. The CMU starts AC signal output by the FC and ACV commands.
2. The CMU starts DC bias output by the DCV command.
3. The CMU performs measurement by a trigger, such as the XE command. If the
trigger is received during the settling time, the measurement starts after the time.
4. After the measurement, the CMU continue the DC bias output with AC signal.
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.
NOTE The FC command sets the AC signal frequency.
The ACV command specifies the oscillator level, and applies the AC signal.
The DCV command applies the specified DC bias.
If the SCUU (SMU CMU Unify Unit) is connected to the CMU and two
MP/HRSMU modules correctly, the source module is automatically selected by the
DC bias setting. The CMU is selected if it is ±25 V or less (setting resolution: 0.001
V), or the SMU is selected if it is greater than ±25 V (setting resolution: 0.005 V).
DCV
Measurement trigger (e.g. XE)
Measurement time
CMU output
Setup value
Previous value
DC bias
Time
: Measurement
FC/ACV
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