Setting Ac Voltage Output - Fluke 5500A Operator's Manual

A softkey label for range appears on the Control Display in the dc voltage function.
Range (Operating Range) 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.

4-22. Setting AC Voltage Output

You may select an ac voltage output in volts or as a power output in dBm, where dBm is
10 log(P /.001) = dBm (P
out
(-57.78 to +62.21 dBm). When selecting dBm outputs, the 5500A calculates dBm
assuming a load impedance of 600 . Therefore, the dBm output may be used directly
only when calibrating instruments with a 600
formula is:
20 log(V
For example, for a voltage output of 2.44949, the equivalent dBm power output is:
20 log(2.44949/0.774597) = 20 log(3.162278) = 10 dBm
Complete the following procedure to set an ac voltage output at the 5500A front panel
NORMAL terminals. If you make an entry error, press
reenter the value.
Verify the applied voltage to the UUT does not exceed the
rating of the UUT insulation.
1. Press
2. Connect the UUT as described earlier in this chapter under "Connecting the
Calibrator to a UUT."
3. Set the UUT to measure ac voltage on the desired range.
4. Output in volts Press the numeric keys and decimal point key to enter the desired
voltage output (maximum six numeric keys). For example, 2.44949.
Output in dBm Press the numeric keys and decimal point key to enter the desired
power output (maximum six numeric keys). For example, 10.0000. For a power
output less than 1 mW (negative dBm values), press
entry with the negative (-) symbol.
is expressed in watts). The output range is 1 mV to 1000 V
out
/0.774597) = dBm.
output
Caution
to clear any output from the 5500A.
input impedance. Based on this, the
to clear the display, then
to append the numeric
Front Panel Operation
Setting the Output
4
4-19