3
Features and Functions
124
Keysight 34980A Mainframe User’s Guide
Front Panel Operation:
DMM or Channel (Configure) > DMM MEASUREMENT
Use the knob (or numeric keypad) to select the desired channel. Then select the
desired measurement function for this channel. You are automatically guided to
the next level of the menu where you can configure other measurement
parameters (range, integration time, etc.).
Remote Interface Operation:
You can select the measurement function using
the
CONFigure
and
MEASure?
commands. For example, the following command
configures the specified channel for dc voltage measurements.
CONF:VOLT:DC 10,DEF,(@3001)
Measurement Range
You can allow the instrument to automatically select the measurement range
using
autoranging
or you can select a fixed range using
manual ranging
.
Autoranging is convenient because the instrument decides which range to use for
each measurement based on the input signal. For fastest scanning operation, use
manual ranging on each measurement (some additional time is required for
autoranging since the instrument has to make a range selection).
– Autorange thresholds:
– If the input signal is greater than can be measured on the selected range
(manual ranging), the instrument gives an overload indication: “±OVLD” from
the front panel or “±9.9E+37” from the remote interface. An overload on ac
voltage measurements will yield one invalid reading following the overload.
– For temperature measurements, the instrument internally selects the range;
you cannot select which range is used. For thermocouple measurements, the
instrument internally selects the 100 mV range. For thermistor and RTD
measurements, the instrument autoranges to the correct range for the
transducer resistance measurement.
– For frequency and period measurements, the instrument uses one “range” for
all inputs between 3 Hz and 300 kHz. The
range
parameter is required only to
specify the resolution. Therefore, it is not necessary to send a new command
for each new frequency to be measured.
Down range at:
Up range at:
<10% of range
>120% of range
