4 Features and Functions
132 Keysight 34970A/34972A User’s Guide
– Changing the number of digits does more than just change the resolution of
the instrument. It also changes the integration time, which is the period the
instrument’s analog-to-digital (A/D) converter samples the input signal for a
measurement. See Custom A/D Integration Time, on page 133 for more
information.
–The MEASure? and CONFigure commands contain an optional resolution
parameter which allows you to specify the resolution.
– The instrument returns to 5½ digits when the measurement function is
changed and after a Factory Reset (*RST command). An Instrument Preset
(SYSTem:PRESet command) or Card Reset (SYSTem:CPON command)
does not change the resolution setting.
– Front-Panel Operation: First, select the measurement function on the active
channel. You are automatically guided to the next level of the menu where you
can select the number of digits. The default is 5½ digits.
6 1/2 DIGITS
For temperature measurements, go to the menu and select the number of
digits displayed past the decimal point on the selected channel.
DISPLAY 1 °C
– Remote Interface Operation: Specify the resolution in the same units as the
measurement function, not in number of digits. For example, if the function is
DC volts, specify the resolution in volts. For frequency, specify the resolution in
hertz.
You can select the resolution using parameters in the MEASure? and
CONFigure commands. For example, the following statement selects the
10 VDC range with 4½ digits of resolution on channel 301.
CONF:VOLT:DC 10,0.001,(@301)
The following statement selects the 1 A range with 6½ digits of resolution on
channel 221.
MEAS:CURR:AC? 1,1E-6,(@221)
– You can also select the resolution using the SENSe commands. For example,
the following statement specifies a 4-wire ohms measurement with 100Ω of
resolution on channel 103.
SENS:FRES:RES 100,(@103)
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