Calibration Using The Computer Interface; Setup; Interface - Fluke 45 Service Manual

Note that the first three calibration points (0, 90 mV, and -90 mV) cannot be edited.
Also, to provide accuracy at full range, calibration is not recommended below one-third
of full range (10000 counts).
Table 4-6. Specifications Increase with Different Calibration Points
Function
DC
AC
300 Ω/100 Ω
kΩ/MΩ

4-18. Calibration Using the Computer Interface

4-19. 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.
4-20. RS-232 Interface
For RS-232 interface operation, use the following procedure from the front panel:
S
1. Press , then press
U
2. Use or
displayed rate.
U
3. Use or
for none.) Then press
U
4. Use or
E
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:
CALSTEP?<CR><LF>
+290.00E-3<CR><LF>
=><CR><LF>
where => is the prompt returned by the Fluke 45. The response to CALREF? also
follows this format.
Cal Point In Display Counts
20000
.006%
.045%
.01%
-
R
.
T
to scroll to the desired baud rate. Then press
T
to scroll to the desired parity ("E" for even, "Odd" for odd, or "no"
E
to select the displayed parity.
T
to display "OFF" or "On" for command echo mode. Then press
Performance Testing and Calibration

Calibration Using the Computer Interface

19000
.006%
.05%
.01%
-
E
to select the
10000
.012%
.09%
.02%
.01%
4-15
4