Agilent Technologies 3458A User Manual page 185

%_resolution
For most measurement functions, you specify the %_resolution as a percentage
of the max._input parameter. (Refer to the FREQ and PER commands for tables
showing how %_resolution affects frequency and period measurements;
%_resolution is ignored when the function parameter is DSAC, DSDC, SSAC, or
SSDC.)
For all functions except FREQ, PER, DSAC, DSDC, SSAC, and SSDC, the
multimeter multiplies %_resolution times max._input to determine the
measurement's resolution. For example, suppose you are measuring DC voltage,
your maximum expected input is 10V, and you want 1mV of resolution. To
determine %_resolution, use the equation:
%_resolution = (actual resolution/maximum input) × 100
For this example, the equation evaluates to:
%_resolution = (.001/10) × 100 = .000l × 100 = .0l
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 8½ digits. (The power-on value for NDIG masks
1 display digit causing the multimeter to display only 7½ digits. You can use the
NDlG 8 command to display all 8½ digits; refer to the NDIG command for details.)
Default % resolution:
For frequency or period measurements, the default %_resolution is .0000l 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 is determined by the
present integration time.
•
Remarks
Query Command. The FUNC? query command returns two responses
separated by a comma. The first response is the present measurement function.
The second response is the present measurement range (this is the actual range,
not necessarily the value specified for max._input). The FUNC? query
command does not indicate the autorange mode. Use the ARANGE? query to
determine the autorange mode. Refer to "Query Commands" near the front of
this chapter for more information.
•
Related Commands: ACDCI, ACDCV, ACI, ACV, APER, DCI, DCV,
DSAC, DSDC, FREQ, OHM, OHMF, PER, RATIO, NPLC, RES, SETACV,
SSAC, SSDC
Chapter 6 Command Reference
FUNC
185