5520A
Operators Manual
4-8
4-11. Using the Operate and Standby Modes
When the OPERATE annunciator is lit and OPR is displayed, the output value and
function shown on the Output Display is active at the selected terminals. When STBY is
displayed in the Output Display, all calibrator outputs are open-circuited except for the
front panel thermocouple (TC) terminals. To enable the operate mode, press O. To
place the calibrator in standby, press S.
If the calibrator is operating and any of the following events occur, the calibrator
automatically goes into the standby mode:
• The R key is pressed.
• A voltage ≥ 33 V is selected when the previous output voltage was less than 33 V.
• Output function is changed between ac or dc voltage when the output voltage is
≥ 33 V; ac or dc current; temperature and any other function; resistance and any
other function; capacitance and any other function.
• A p-p voltage output (square wave, triangle wave, or truncated sine wave) changes to
rms voltage output ≥ 33 V (sine wave). For example, if a p-p output of 40 V is
changed to rms output of 40 V by changing the wave form using the WAVE softkey,
the calibrator goes into the standby mode.
• The output location for current is changed from AUX to 20 A, or vice versa.
• An overload condition is detected.
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