Specifying The Range; Configuring For Dc Or Resistance Measurements; Dc Voltage - Agilent Technologies 3458A User Manual

Specifying the Range

Configuring for DC or Resistance Measurements

DC Voltage

54 Chapter 3 Configuring for Measurements
OUTPUT 722;"ARANGE ONCE"
Now when triggering begins, the multimeter will select the correct range and
then disable autorange. Later, if you need to enable autorange, send:
OUTPUT 722; "ARANGE ON"
You specify a fixed range using the first parameter of one of the function
commands (ACV, DCV, OHM. etc.) or the RANGE command. This
parameter is called max._inputsince you specify it as the input signal's
maximum expected amplitude (or the maximum resistance for resistance
measurements). The multimeter then chooses the correct range. When
specifying max._input, use the absolute value of the input signal—no
negative numbers. For example, to specify DC voltage with a maximum input
of -2.5 volts, send:
OUTPUT 722; "DCV 2.5"
In this case, the multimeter selects the 10 VDC range. To specify a different
max_input(e.g. 15V) without changing the measurement function, send:
OUTPUT 722; "RANGE 15"
In this case, the multimeter selects the 100V range.
Note
For frequency and period measurements, the max._input parameter
specifies the maximum amplitude of the input signal. It does not specify the
frequency range (Hz) or the period range (seconds).
You select the autorange mode by defaulting the max._input parameter or by
specifying AUTO. For example, to select, autorange using the DCV
command, send:
OUTPUT 722; "DCV"
Refer to the FUNC or RANGE command in Chapter 6 for tables showing
the ranges for each measurement function.
This section describes how to configure the multimeter for making DC
voltage, DC current, and 2-wire or 4-wire resistance (ohms) measurements.
The multimeter measures DC voltage on any of five ranges. Table 12 shows
each DC voltage range and its full scale reading (which also shows the
maximum number of digits for the range). Table 12 also shows the maximum
resolution and the input resistance for each range. (Resolution is a function
of the specified integration time: refer to Setting the Integration Time later
in this section for more information.) Figure 11 shows the front terminal
connections for all types of voltage measurements. In the power-on/PRESET
NORM states. DC voltage measurements are selected. You can also specify
DC voltage measurements using the DCV command. For example, to specify