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Measurement Speed and Accuracy Trade-offs 193Appendix C
Appendix C
Measurement Speed and Accuracy Trade-offs
The HP E1312A and HP E1412A Multimeters were designed so the default
mode of operation will deliver high accuracy readings with a minimum of
programming effort. However, many applications require high-speed
measurements. This appendix discusses two topics:
1. special non-SCPI function (
F1, F2, F3 and F4) and range (R1, R2, R3,
R4, R5, R6 and R7) commands used to speed up measurement setup
and
2. how to increase measurement speed where reduced reading accuracy
is acceptable.
HP E1312A/E1412A Special Function and Range
Commands (Non-SCPI )
The HP E1312A and HP E1412A Multimeter have special function and
range commands for
DCV, DCI, 2-wire resistance (RES) and four-wire
resistance (
FRES) shown in the following table. ACV, ACI, frequency or
period functions are not supported with these special commands.
These special commands act like a
[SENSe:] command to change a function
or range. The range command acts only on the current function. For
example, if the current function is
DCV and its range is 10V, sending the
range command
R2 changes the DCV range to 1V but does not affect the
DCI, RES or FRES ranges. To also change the 2-wire resistance range to the
R2 setting, you must send the commands
F3 and R2. First F3 changes the
current function from
DCV to RES then R2 sets the range to 1KΩ. Sending
F1 returns the function to DCV and to the range and state it was last set prior
to the
F3 command.
The table on the following page shows equivalent
[SENSe:] commands for
the special commands.
Special Function and Range Commands
RANGE
FUNCTIONR1R2R3R4R5R6R7
F1 (DCV) 0.1V 1V 10V 100V 300V
INVALID RANGES
F2 (DCI) 0.01A 0.1A 1A 3A
WILL RETURN “Out of range” ERROR
F3 (RES) 100Ω 1KΩ 10KΩ 100KΩ 1MΩ 10MΩ 100MΩ
F4 (FRES) 100Ω 1KΩ 10KΩ 100KΩ 1MΩ 10MΩ 100MΩ