2
Operating Your Instrument
94
Keysight 53147A/148A/149A Operating and Programming Guide
Power Measurement Example
1 Connect the output cable from the power-meter head to the Power Meter
Input connector.
This example assumes that you have a power head available that is
appropriate for the measurement to be taken.
2 Press the Display Power key to enable power measurement.
The
Pwr
annunciator at the left side of the display is activated, and the Power
Meter’s digital and analog power displays show the power measurement in dB
or dBm (the default units of power measurement).
The display should look like this:
NOTE
You must re-zero and recalibrate the Power Meter if you change the power head,
if the instrument is shut off for any period of time, if the ambient temperature
changes by 5
°
C (9
°
F) or more, and if the GPIB “INIT” command is sent to the
instrument. In any case, you should calibrate the Power Meter at least once a
day.
CAUTION
Always follow the directions provided with the power head in addition to the
instructions provided in this manual.
NOTE
The instrument must be powered on and must remain at the same ambient
temperature for 15 minutes before beginning this procedure. If the temperature
changes by 5
°
C (9
°
F) or more, wait another 15 minutes.
dB
dBm
Watts
mW
uW
%
Pwr
Ch 2
Freq
NOTE
When there is no signal applied to the power head, the Power Meter reads the
noise level, as shown in the illustration above. This reading is generally below
–25 dBm prior to zeroing and will vary.
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