Agilent Technologies 3458A User Manual page 223

frequency and period measurements, you specify %_resolution as the number of
digits to be resolved. For the remaining measurement functions (DCV, ACV,
ACDCV, OHM, OHMF, DCI, and ACI), you specify the %_resolution as a
percentage of the max._input parameter. The multimeter then multiplies
%_resolution by the max._input to determine the measurement's resolution.
For example, suppose your maximum expected input is 10V and you want 1mV
of resolution. To determine %_resolution, use the equation:
%_resolution = (actual resolution/maximum input) × 100
In this example, the equation evaluates to:
%_resolution = (.001/10) × 100 = .0001 × 100 = .01
Note
When using autorange, the multimeter multiplies the %_resolution parameter
times the full scale reading of the selected range. The result is the minimum
resolution. The multimeter always gives you at least the minimum resolution
and, in many cases, gives you additional digits of resolution.
Power-on %_resolution = none. At power-on, the resolution is determined by the
NPLC command which produces 8 ½ digits. (The power-on value for NDIG
masks 1 display digit causing the multimeter to display only 7 ½ digits. You can
use the NDIG 8 command to display all 8 ½ digits; refer to the NDIG command
for details.)
Default %_resolution:
For frequency or period measurements, the default %_resolution is .00001
which selects a gate time of 1s and 7 digits of resolution.
For sampled ACV or ACDCV, the default %_resolution is 0.01% for
SETACV SYNC, or 0.4% for SETACV RNDM.
For all other measurement functions, the default resolution time is determined
by the present integration time.
•
Remarks
Query Command. The RANGE? query command returns the present
measurement range. (RANGE? does not indicate the autorange mode; use the
ARANGE? command to determine the autorange mode.) Refer to "Query
Commands" near the front of this chapter for more information.
•
Related Commands: ARANGE, FUNC, R
Examples
In the following program, line 10 allows %_resolution in line 30 to control the
resolution. The resolution specified by line 30 is 10m
10 OUTPUT 722;"NPLC 0"
20 OUTPUT 722;"OHM"
30 OUTPUT 722;"RANGE 800,.00125"
40 END
W
.
!SETS PLCS TO MINIMUM
!SELECTS 2-WIRE OHMS
ÿ
W
!SELECTS 800 MAX, 10m
!RESOLUTION
Chapter 6 Command Reference
RANGE
W
223