Fluke 9640A Series Instruction Manual page 244

9640A
Instruction Manual
Alternatively, the UUT units selection may be changed to V rms to display
targets and adjust output values directly in rms voltage. Press the Units key
and select the required units.
Measurements made on the 5790A 2.2 mV range (at levels below -40 dBm)
require correction for the 2.2 mV range linearity error.
8. Repeat steps 6 and 7 for all points requiring the use of the AC Measurement Standard
9. Disconnect the AC Measurement Standard and 50 Ω feedthrough termination from
Throughout the course of the calibration adjustment, the UUT internally
accounts for values previously adjusted using one reference instrument in
order to accomplish accurate transfers to other reference instruments.
10. Set the UUT to OPER .
11. Enter the measurement frequency corresponding to each Target into the power meter
The recommended power meter has power sensor calibration factors stored
internally in the sensor. Setting the input frequency in the power meter
automatically selects the appropriate cal factor for the measurement.
However, the power sensor may also be accompanied by a table of
calibration factors which must be applied externally.
The diode-based power sensor may exhibit frequency dependent linearity
errors, and additional corrections for these errors must also be applied.
The power meter autorange boundary may coincide with a measurement
point. To avoid unwanted power meter autoranging during the adjustment
process, manually lock the power meter range when the UUT indicates the
current adjustment point is a Transfer Point and maintain the power meter
range lock for all frequencies at that amplitude. When the sequence reaches
the next Transfer Point allow the power meter to autorange and then
manually lock the power meter range again, continuing in this fashion for
all points requiring use of the power meter.
12. Using the blue arrow keys and rotary knob, edit the UUT Actual output until the
13. Press Next Target .
14. Repeat steps 11 through 13 for all points requiring the use of the power meter and
15. Disconnect the power meter and sensor from the UUT base unit. Connect the UUT
16. Set the UUT to OPER .
5-54
(the UUT text box states Use Precision AC Voltmeter) . Set the UUT to STBY .
the UUT base unit. Connect the UUT SMA output directly to the input of the 50 Ω
low-power (diode) sensor. Do not use a cable between the UUT SMA connector and
the power sensor input.
to enable cal factor (frequency) correction.
power meter indicates the Target value stated. Press Accept Target .
sensor (the UUT text box states, Use Power Meter ). Set the UUT to STBY .
SMA output to the input of the spectrum analyzer/measuring receiver.
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