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.

Special Function and Range Commands

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RANGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FUNCTION

R1

R2

R3

R4

R5

R6

R7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

Appendix C

Measurement Speed and Accuracy Trade-offs 193

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Image 193
HP WaterSkis E1412A, WaterSkis E1312A manual Measurement Speed and Accuracy Trade-offs