Specifying A Measurement Function; Autorange - Agilent Technologies 3458A User Manual

Specifying a
Measurement
Function
ACDCI
ACDCV
ACI
ACV
DCI
DCV
DSAC *
DSDC *
FREQ
OHM
OHMF
PER
SSAC *
SSDC *

Autorange

30 END
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.
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
Selects AC current measurements, DC coupled
Selects AC voltage measurements, DC coupled
Selects AC current measurements, AC coupled
Selects AC voltage measurements, AC coupled
Selects DC current measurements
Selects DC voltage measurements
Direct sampling, AC coupled
Direct sampling, DC coupled
Selects frequency measurements
Selects 2-wire ohms measurements
Selects 4-wire ohms measurements
Selects period measurements
Sub-sampling, AC coupled
Sub-sampling, DC coupled
* Refer to Chapter 5Digitizing for more information on these functions.
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:
Description
Chapter 3 Configuring for Measurements 53