Agilent Technologies B1500A Servisní příručka Strana 140

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2-54 Agilent B1500A/B1505A Programming Guide, Edition 11
Remote Mode Functions
SPGU Module
NOTE SPGU DC bias output
The SPGU offers the additional functionality of serving as a DC voltage source.
However, it is not suitable for applications requiring an accurate DC bias voltage
because of 50 Ω output impedance. For these applications, use the SMU.
NOTE SPGU Channel Status
The SPGU status can be read with the SPST? command. The channel output will be
active (SPST? response is 1) while the channel performs the pulse output or the
ALWG sequence output. The status changes to the wait state (SPST? response is 0)
when one of the following conditions occurs.
SPP command
Repeat count reaches the number specified by SPRM 1 (only for count mode)
Output time specified by SPRM 2 elapses (only for duration mode)
A command sets the output switch OFF
The output operation mode is changed by the SPRM command
The SPGU output can be started by the SRP command, which will cause the status
to change to active state.
NOTE Terminal voltage measurement and load impedance calculation
SPGU performs voltage measurement and impedance calculation by executing the
CORRSER? command. Followings are the recommended measurement conditions
for the voltage measurement.
Output voltage: > 1 V
Minimum load impedance: 40 Ω
Maximum load impedance: 500 Ω (1 V), 2000 Ω (2 V), 5000 Ω (10 V)
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