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5522A
Operators Manual
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:
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How to Connect the Calibrator to a UUT
The Calibrator is capable of supplying lethal voltages. Do not
make connections to the output terminals when a voltage is
present. Placing the instrument in standby may not be enough
to avoid shock hazard, since the O key could be pressed
accidentally. Press reset and verify that the STBY annunciator
appears on the Control Display before making connections to
the output terminals.
The outputs labeled NORMAL (HI and LO) are used to source voltages, resistances,
capacitance and simulate resistance temperature detector (RTD) outputs. The LO
terminal connects to the analog signal ground inside the guard shield. This signal line
may or may not be tied to the guard shield and/or to chassis ground, depending on the
settings of the Z and B keys. See "When to Use EARTH and EXGRD" on the next
page for an explanation of these internal connections.
The outputs labeled AUX (HI and LO) source current and low voltages in the dual
voltage function. These outputs are also used for four-wire or remote sensing in the
resistance, capacitance and RTD functions.
When an oscilloscope calibration option is installed, the BNC connectors labeled SCOPE
OUT and TRIG deliver signals for oscilloscope calibration.
The socket labeled TC is used to measure thermocouples and to generate simulated
thermocouple outputs.
4-8
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.
Warning
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