mA Calibrator
Calibration Adjustment
7
Table 4. DC Current Source / Current Measure / Voltage Measure Mode Tests
Test No.
707Ex mA Calibrator Output
Mode
HP 3458A Minimum
HP 3458A Maximum
1
2
3
4.000 mA
12.000 mA
24.000 mA
mA Source
mA Source
mA Source
3.9974 mA
11.9962 mA
23.9944 mA
4.0026 mA
12.0038 mA
24.0056 mA
Test No.
5520A Calibrator Output
Mode
Fluke 707Ex Minimum
Fluke 707Ex Maximum
4
5
6
4.000 mA
12.000 mA
24.000 mA
mA Measure
mA Measure
mA Measure
3.997 mA
11.996 mA
23.994 mA
4.003 mA
12.004 mA
24.006 mA
Test No.
5520A Calibrator Output
Mode
Fluke 707Ex Minimum
Fluke 707Ex Maximum
7
8
9
0.000 V
14.000 V
28.000 V
Volt Measure
Volt Measure
Volt Measure
-0.002 V
13.995 V
27.993 V
0.002 V
14.005 V
28.007 V
DC Voltage Measurement Mode
Tests 7-9:
1.
Press
A
twice to get the mA Calibrator to
V MEASURE
. The mA Calibrator’s display
should read "
V
".
2.
Connect the test leads from the
NORMAL
output
terminals of the Fluke 5520A to the input
terminals on the mA Calibrator (black to
COM
and red to
+
).
3.
Set the Fluke 5520A to test 7 in Table 4 and
verify the display reading on the mA Calibrator.
4.
Repeat for tests 8 and 9.
5.
The reading on the display should be within the
minimum and maximum values shown in
Table 4.
6.
Set the 5520A output to 0 V (zero), and set output
to
STANDBY
.
7.
Turn the mA Calibrator
OFF
and disconnect the
mA Calibrator from the 5520A.
8.
The performance verification tests are now
complete.
9.
If the mA Calibrator failed any of these tests,
calibration adjustment or repair is required.
Calibration Adjustment
Perform the following calibration adjustment
procedure if the mA Calibrator fails the performance
verification test.
Calibration Adjustment Counter
The mA Calibrator contains a calibration adjustment
counter. The value in the calibration adjustment
counter can be recorded and used to show that no
adjustments have been made during a calibration
cycle. When Fluke performs the calibration, the value
of the calibration adjustment counter will be recorded
on the calibration label.
To find the value in the calibration adjustment
counter, hold down
B
while turning the unit on.
The software revision will display for 2 seconds
followed by the calibration counter for another 2
seconds.
Note
Make sure that the mA Calibrator has a new
battery before starting the calibration
procedure. Calibration will not function
properly if the low battery indicator
(
M
)
is
on.
Because the mA Calibrator incorporates several key
hold start up features, entering the Adjust mode
through the keypad requires an exact key hold
sequence:
1.
With the mA Calibrator off, hold down
B
and
C
and turn the mA Calibrator on.
"
CAL
"
appears on the main display and the
calibration adjustment counter is displayed on the
