418 Setup

Before performing this type of calibration, make sure that computer interface connections are made to the Fluke 45. Then verify the ac power connection to the Fluke 45, and turn the meter on.

4-19. RS-232 Interface

For RS-232 interface operation, use the following procedure from the front panel:

2. Use (^B or to scroll to the desired baud rate. Then press (auto) to select the displayed rate.

3. Use (^B or to scroll to the desired parity ("E" for even, "Odd" for odd, or "no" for none.) Then press (auto) to select the displayed parity.

4. Use or to display "OFF" or "On" for command echo mode. Then press AA to make the selection.

5. Send the following command from the computer interface: *IDN?<CR>

6. Check for a response in the following format:

FLUKE, 45, nnnnnnn, n.n Dn.n <CR><LF> =><CR><LF>

where 'nnnnnnn' is the multimeter serial number, 'n.n' identifies the main software version, Dn.n' identifies the display software version, and '=>' is the RS-232 prompt.

If echo mode is ON, the response to the CALSTEP? command called for in Table 4-7 (step 12) appears in the form:

where => is the prompt returned by the Fluke 45. The response to CALREF? also follows this format.

4-20. IEEE-488 Interface

For IEEE-488 interface operation, use the following front panel procedure:

2. Use M to scroll to "IEEE". Then press i to enable the IEEE-488 interface.

3. Send the following to the meter over the IEEE-488 bus:

Note

The following example uses Fluke BASIC commands entered from a Fluke 1722A Instrument Controller. Syntax may vary for other controllers.

INIT PORT 0<CR> CLEAR PORT 0<CR>

PRINT @<address of meter>,"*IDN?"<CR> INPUT LINE @<address of meter>,A$<CR> PRINT A$<CR>

4. Check for the following response format:

FLUKE, 45, nnnnnnn, n.n Dn.n where 'nnnnnnn' is the multimeter serial number, 'n.n' identifies the main software version, and 'Dn.n' identifies the display software version.

Table 4-7. Calibration Using the Computer Interface

Note

Before proceeding, allow for settling time of at least 30 seconds with no input applied.

Step

Apply Input

Wait For Meter Settling Time

Send

10

0.0000 mV dc 90.000 mV dc -90.000 mV dc 900.00 mV dc 90.000 mV dc 290.00 mV dc 2.9000 V dc 29.000 V dc 290.00 V dc 1000.0 V dc

5 s 2 s 2 s 2 s 5 s 1 s 1 s 1 s 1 s 1 s

CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP?

Note

Settling times mentioned here assume that steps 1 through 32 are followed in sequence. If you have just calibrated dc volts (steps 1 through 10), but do not follow the subsequent sequence, a special settling period of4 minutes may be required due to dielectric absorption caused by the 1000 V dc input in step 10. Examples of this requirement include re-checking dc volts calibration (going from step 10 back to step 1) or skipping to ohms calibration (going from step 10 to step

25.)

AC Volts Calibration

11 12

16 17

29.000 mV ac, 1 kHz 290.00 mV ac, 1 kHz 290.00 mV ac, 1 kHz 2.9000 V ac, 1 kHz 29.000 V ac, 1 kHz 290.00 V ac, 1 kHz 750.00 V ac 1 kHz

3 s 3 s 3 s 3 s 3 s 3 s 3 s

CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP?

DC Milliamps Calibration

18 19

29.000 mA DC 100.00 mA DC

1 s 1 s

CALSTEP? CALSTEP?

DC Amps Calibration

22

10.000 A DC

3 s

CALSTEP?

AC Amps Calibration

23

2.000 A AC, 1 kHz

5 s

CALSTEP?

24

10.000 A AC, 1 kHz

5 s

CALSTEP?

Ohms Calibration

Step

Range

Input

Wait for Meter Settling Time

Send

Send

26 27 28** 29**

5

190.0 W* 1.900 kW 19.00 kW 190.0 kW 1.900 MW

3 s 3 s

CALREF xxx.xx CALREF xxxx.x CALREF xxxxx CALREF xxxxxx CALREF xxxxxxx

CALSTEP? CALSTEP? CALSTEP? CALSTEP? CALSTEP?

Table 4-7. Calibration Using the Computer Interface (cont)

Continuity/Hysteresis Threshold Calibration

Step

Apply input

Wait for meter settling time

Send

CALSTEP? CALSTEP?

Frequency Calibration

CALSTEP?

(xxxx... represents the known exact ohms value of the source)

* A 190 W source calibrates the 300 W range on the Fluke 45 to 0.06%+2 digits +0.02 W. For calibration of this range to 0.05%+2 digits +0.02 W, use a 290 W source and the procedure detailed under Alternate Ohms Calibration (Computer Interface). This procedure can also be used with appropriate discrete resistor values (such as a decade box) on all ranges.

** Note that the 290 kW and 2.9 MW ranges are quite sensitive to noise. Any movement of the input leads or movement of the hands or body in the vicinity of the leads can cause noisy readings. Use shielded leads during this calibration. These two cal points should be verified for accuracy at the conclusion of calibration.

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