5502A
Operators Manual
4-52
To select a higher-order digit, use an Edit Field cursor key
or
. The output digit
in edit is always underlined (see below).
nn115f.eps
The short indication of the letter “u” on the Output Display when you edit during OPR
(Operate) means “unsettled”. The Calibrator output must become stable to a new value.
Show the UUT Error
When you edit the output value, the Control Display shows the difference in the reference
value (the value you initially recorded) and the edit value (the value shown in the Output
Display), shows the error difference in parts per million (ppm) or percent (%). For
example, if ERR UNI is set to > 100 ppm, the error will be shown in ppm to a maximum
of 99 and then the error will change to 0.0100 % at 100 ppm. This lets you edit the output
so that the UUT shows the anticipated value and so give an indication of the UUT
accuracy.
nn116f.eps
For example, an edited difference of .00030 V for an output of 10.00000 V shows
0.00030/10.00000=0.000030, or 30 parts per million. The sign is negative (-30.0 ppm)
because the output necessary to show 10.00000 at the UUT shows the UUT measurement
is below the output value. When the reference is negative, the error sign is in relation to
the magnitude. For example, if the reference is -10.00000 V and the output shown
is -10.00030, the error is -30 ppm.
The Calibrator has two methods to show the UUT error. The first method is the
“nominal” method that is used in the Fluke Calibration 5700A, 5720A, 5500A, 5520A,
5522A, and 5502A Calibrators. The second method is the “true value” method. Each
method is used in this Calibrator.
The nominal method of error calculation uses the formula:
reference value – edit value
reference value
The nominal method is useful for measure the error of the Calibrator, when you verify its
performance against a more accurate device.
The true-value method of error calculation uses the formula:
Reference value – edit value
edit value
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