Keysight Truevolt Series Operating And Service Manual page 289

SCPI Programming Reference
MEASure[:VOLTage][:DC]:RATio? [{< range >|AUTO|MIN|MAX|DEF} [, {< resolution >|MIN|MAX|DEF}]]
Sets all measurement parameters and trigger parameters to their
urements and immediately triggers a measurement. The results are sent directly to the instrument's out-
put buffer.
To calculate a ratio, the instrument measures a DC reference voltage applied to the Sense terminal and
the DC signal voltage applied to the Input terminals. It then uses the formula:
Ratio = DC signal voltage / DC reference voltage
<range>: 100 mV, 1 V, 10 V, 100 V, 1000 V, AUTO (default) or DEFault
Resolution Table
<resolution>: See
NPLC.
The default is equivalent to 10 PLC.
Configure DC voltage ratio measurements using the 100 V range with 1 mV resolution. Then make and read
one measurement:
MEAS:VOLT:DC:RAT? 100,0.001
Typical Response:+4.27150000E+00
The Sense terminals have a maximum measurable input of ±12 VDC. Autoranging is automatically
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selected for reference voltage measurements on the Sense terminals.
The Input LO and Sense LO terminals must have a common reference and cannot have a voltage dif-
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ference greater than ±2 V.
The specified measurement range applies only to the signal connected to the Input terminals. The sig-
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nal on the Input terminals can be any DC voltage up to 1,000 V.
For the Input terminals, you can allow the instrument to select the measurement range by autor-
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anging or you can select a fixed range using manual ranging . Autoranging decides which range to use
for each measurement based on the input signal. For faster measurements, use manual ranging on
each measurement (additional time is required for autoranging to select a range).
Autoranging (AUTO or DEFault), will generate an error if you specify a < resolution > because the instru-
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ment cannot accurately resolve the integration time (especially if the input continuously changes). If
your application requires autoranging, specify DEFault for the < resolution > or omit the < resolution >
altogether.
Autoranging goes down a range at less than 10% of range and up a range at greater than 120% of
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range.
If the input signal is greater than can be measured on the specified manual range, the instrument dis-
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plays the word Overload on front panel and returns "9.9E37" from the remote interface.
290
Parameter
Range, Resolution and
or
default values for DC voltage ratio meas-
Typical Return
(none)
Keysight True volt Series Operating and Service Guide