430 Alternate Ohms Calibration Computer Interface

This procedure can be used with discrete resistor values (such as a decade box). On the 300 W range, this alternate procedure uses a 290 W source and yields a specification of

0.05.+2 digits +0.02 W. Alternate calibration of this range is detailed below, although discrete resistor values can be used for all ranges. Lead and source zero resistances are only taken into account for the lowest two ranges (300 W and 3 kW).

1. Add the value of lead and source zero resistance to the certified value of the source resistor. Lead and source zero resistance is the value obtained with the VAL? command, immediately prior to entering dc volts calibration. Use this total value as 'xxx.xx' in the following command:

CALREF xxx.xx

2. Now send

CALSTEP?

Table 4-8. Calibration Mode Computer Interface Commands

CAL x

Start calibration of a new function, where x = 1 through 9, defined as follows:

1 VDC calibration

2 VAC calibration

3 DC Milliamps calibration

4 AC Milliamps calibration

5 DC Amps calibration

6 AC Amps calibration

7 Ohms calibration

8 Frequency comparator

9 Frequency calibration

CALCLR

Reset all calibration constants to nominal values, destroying present calibration.

CALCONST? xx

Return the value of the calibration constant indicated by xx. See Table 4-9.

CALREF?

Return the present calibration reference.

CALREF xxx.xx

Calibrate to the exact value xxx.xx, rather than the nominal (expected) cal value.

CALSTEP?

Return the calibrated value of the input.

EEREG? xx

Return the contents of the specified EEROM register (xx).

The following additional computer interface commands can be used in Calibration Mode. Use of any other

command results in an execution error.

*CLS

BUTTON?

*ESE

FORMAT?

*ESE?

LOCS

*ESR?

LWLS

*IDN?

REMS

*OPC

RWLS

*OPC?

SERIAL?

*RST

FORMAT

*SRE

VAL?

*SRE?

VAL1?

*STB?

*TRG

*WAI

Table 4-9. EEROM Calibration Constants

Calconst?

Valid Range

Description

1

0.97025 to 1.03775

VDC, range 1

2

0.97025 to 1.03775

VDC, range 2

3

0.97267 to 1.04554

VDC, range 3

4

0.96782 to 1.04035

VDC, range 4

5

0.96792 to 1.04045

VDC, range 5

6

0.9975 to 1.0025

100 mV gain

7

0.9975 to 1.0025

320 mV gain

8

0.9975 to 1.0025

3.2 V gain

9

-100 to 100

VAC offset, range 1

10

0.9725 to 1.0275

VAC, range 1

11

-100 to 100

VAC offset, ranges 2 through 4

12

0.9725 to 1.0275

VAC, range 2

13

0.9725 to 1.0275

VAC, range 3

14

0.9725 to 1.0275

VAC, range 4

15

0.9725 to 1.0275

VAC, range 5

16

0.9500 to 1.0500

ADC, range 1

17

0.9500 to 1.0500

ADC, range 2

18

0.9500 to 1.0500

ADC, range 3

19

0.9225 to 1.0775

AAC, range 1

20

0.9225 to 1.0775

AAC, range 2

21

-100 to 100

AAC offset, range 3

22

0.9225 to 1.0775

AAC, range 3

23

0.9990 to 1.0090

OHMS, range 1

24

1.0000 to 1.0100

OHMS, range 2

25

1.0040 to 1.0140

OHMS, range 3

26

0.9990 to 1.0090

OHMS, range 4

27

0.9990 to 1.0090

OHMS, range 5

28

0.9990 to 1.0090

OHMS, range 6

29

0.9886 to 1.0035

Slow Siemens

30

0.9910 to 1.0010

Medium and Fast Siemens

31

0.9999 to 1.0001

Frequency calibration

32

-10.0 to 10.0

Slow offset

33

1.0000 to 1.0006

Slow negative gain

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