5520A
Operators Manual
4-24
4. Press the numeric keys and decimal point key to enter the desired current output
(maximum six numeric keys). For example, 234.567.
5. Press I to select the polarity of the current (default is +).
6. Press a multiplier key, if necessary. For example, press c.
7. Press A.
8. The Control Display now shows the amplitude of your entry. For example,
234.567 mA.
nn077f.eps
9. Press E. The calibrator clears your entry from the Control Display and copies
it into the Output Display (below is typical).
nn078f.eps
10. Press O to activate the calibrator output.
A range softkey appears on the Control Display in the dc current function (operating
range). This selects autorange (auto) or lock (locked) for the present range. When auto
(the default setting) is selected, the calibrator automatically selects the range that
provides the best output resolution. When locked is selected, the calibrator will not
change ranges when you are editing the output. The locked selection is usually made
when you do not want range changes that may cause a small perturbation in the output,
e.g., when checking the linearity of a given multimeter range.
Another softkey appears: OUTPUT. When you select 20 A for this parameter, or you
select a current above 3 A, the calibrator switches to standby, and you must change the
test lead to the 20A terminal and press O to activate the output.
4-25. Setting AC Current Output
Complete the following procedure to set an ac current output at the AUX or 20A
terminals. If you make an entry error, press G to clear the display, then reenter the value.
1. Press R to clear any output from the 5520A.
2. Connect the UUT as described earlier in this chapter under “Connecting the
Calibrator to a UUT.”
3. Set the UUT to measure ac current on the desired range.
4. Press the numeric keys and decimal point key to enter the desired current output
(maximum six numeric keys). For example, 123.456.
5. Press a multiplier key, if necessary. For example, press c.
6. Press A.
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