MEASure[:VOLTage][:DC]:RATio? [{<
range
>|AUTO|MIN|MAX|DEF} [, {<
resolution
>|MIN|MAX|DEF}]]
Sets all measurement parameters and trigger parameters to their
for DC voltage ratio meas-
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
Parameter
Typical Return
<
range
>: 100 mV, 1 V, 10 V, 100 V, 1000 V, AUTO (default) or DEFault
(none)
<
resolution
>: See
or
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 Re4.2700
l
The
Sense
terminals have a maximum measurable input of ±12 VDC. Autoranging is automatically
selected for reference voltage measurements on the
Sense
terminals.
l
The
Input LO
and
Sense LO
terminals must have a common reference and cannot have a voltage dif-
ference greater than ±2 V.
l
The specified measurement range applies only to the signal connected to the
Input
terminals. The sig-
nal on the
Input
terminals can be any DC voltage up to 1,000 V.
l
For the
Input
terminals, you can allow the instrument to select the measurement range by autor-
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).
l
Autoranging (AUTO or DEFault), will generate an error if you specify a <
resolution
> because the instru-
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.
l
Autoranging goes down a range at less than 10% of range and up a range at greater than 120% of
range.
l
If the input signal is greater than can be measured on the specified manual range, the instrument dis-
plays the word
Overload
on front panel and returns "9.9E37" from the remote interface.
SCPI Programming Reference
290
Keysight True
volt
Series Operating and Service Guide
