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In addition to the PRESET NORM command, the multimeter has a PRESET
FAST command (configures for fast readings and transfers), which is
discussed in Chapter 4, and a PRESET DIG command (configures for DCV
digitizing) which is discussed in Chapter 5.
Specifying a
Measurement
Function
The first parameter of the FUNC command selects the measurement function.
For example, to specify DC voltage measurements, send:
OUTPUT 722;"FUNC DCV"
The FUNC command header is optional and can be omitted. For example,
you can specify DC voltage measurements simply by sending:
OUTPUT 722;"DCV"
The remaining examples in this chapter use the shortened (no FUNC header)
version. Table 11 shows the various measurement function parameters and
the function selected by each.
Table 11: Measurement Function Parameters
Function Parameter
Description
ACDCI
Selects AC current measurements, DC coupled
ACDCV
Selects AC voltage measurements, DC coupled
ACI
Selects AC current measurements, AC coupled
ACV
Selects AC voltage measurements, AC coupled
DCI
Selects DC current measurements
DCV
Selects DC voltage measurements
DSAC *
Direct sampling, AC coupled
DSDC *
Direct sampling, DC coupled
FREQ
Selects frequency measurements
OHM
Selects 2-wire ohms measurements
OHMF
Selects 4-wire ohms measurements
PER
Selects period measurements
SSAC *
Sub-sampling, AC coupled
SSDC *
Sub-sampling, DC coupled
* Refer to Chapter 5Digitizing for more information on these functions.
Autorange
When the autorange function is enabled, the multimeter samples the input
prior to each reading (when readings are being triggered) and automatically
selects the correct range. Since autorange requires sampling the input,
measurements made with autorange enabled take longer than measurements
made on a fixed range. In the power-on/PRESET NORM state, autorange is
enabled. If you intend to measure a fairly stable input signal, you can use the
ARANGE ONCE command to allow autorange to select the correct range
(when readings are triggered) and then disable autorange for subsequent
readings. This allows you to get the automatic range selection advantage of
autorange and also the speed advantage of readings made with autorange
disabled. To do this, send:
Chapter 3 Configuring for Measurements
53