5520A
Operators Manual
4-54
To select a higher order digit, use an Edit Field cursor key LorW. The output digit
in edit is always underlined (see below).
nn115f.eps
The momentary display of the letter u in the Output Display when editing during OPR
(Operate) indicates “unsettled,” that is, the Calibrator output is settling with a new value.
4-47. Displaying the UUT Error
When you edit the output value, the Control Display shows the difference between the
reference value (the value you originally entered) and the edit value (the value shown in
the Output Display), displaying error difference in parts per million (ppm) or percent
(%). For example, if ERR UNI is set to > 100 ppm, the error will be displayed in ppm up
to 99 and then the error will change to 0.0100% at 100 ppm. This allows you to edit the
output such that the UUT displays the expected value and thus give an indication of the
UUT accuracy.
nn116f.eps
For example, an edited difference of .00030 volts for an output of 10.00000 V represents
0.00030/10.00000=0.000030, or 30 parts per million. The sign is negative (-30.0 ppm)
because the output necessary to display 10.00000 at the UUT shows the UUT is reading
below the output value. When the reference is negative, the error sign is relative to the
magnitude. For example, if the reference is -10.00000 V and the output display is
-10.00030, the error is -30 ppm.
4-48. Using Multiply and Divide
The 5520A output value (or reference value if you have edited the output) can be
multiplied by a factor of 10 by pressing the X key. Similarly, the output value (or
reference value if you have edited the output) can be divided a factor of 10 by pressing
the D key. The output will be placed in STBY (Standby) if the multiplied value
exceeds 33 V. Press the O key if you wish to continue. This feature is useful for
UUTs with ranges organized in decades.
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