5500A
Operator Manual
4-50
To select a higher order digit, use an Edit Field cursor key L or W. The output
digit in edit is always underlined (see below).
+ 10.00030 V
OPR
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.
4-48. Displaying the Output 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). This allows
you to edit the output such that the UUT displays the expected value and thus give an
indication of the UUT accuracy.
ref= +10.00000 V
err= -30.0 ppm
For example, an edited difference of .00030 volts for an output of 10.00000 V represents
.00030/10.00000=.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.
4-49. Using Multiply and Divide
The 5500A 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 33V. Press the O key if you wish to continue. This feature is useful for
UUTs with ranges organized in decades.
4-50. Setting Output Limits
An output limit feature is available to help prevent accidental damage to a UUT from
overcurrent or overvoltage conditions. This feature allows you to preset the maximum
positive and negative allowable voltage or current output. Entry limits you set prevent
any output greater than the limit from being activated by entry through the front panel
keys or the output adjustment controls. Positive limits for voltage and current set the
limits for ac voltage and current. Your limit selections are saved in the nonvolatile
memory. Voltage limits are expressed as rms values, and any voltage offsets are ignored.
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