MEASure[:VOLTage][:DC]:RATio? [{<range>|AUTO|MIN|MAX|DEF} [,
{<resolution>|MIN|MAX|DEF}]]
Sets all measurement parameters and trigger parameters to their default values for DC voltage ratio measurements
and immediately triggers a measurement. The results are sent directly to the instrument's output 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 +4.27150000E+00
<resolution>: See Resolution Table or Range, Resolution and 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
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 difference
greater than ±2 V.
l The specified measurement range applies only to the signal connected to the Input terminals. The signal 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 autoranging 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 instrument
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 displays the
word Overload on front panel and returns "9.9E37" from the remote interface.
172 Agilent Truevolt Series DMM Operating and Service Guide
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