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This section describes how to zero and calibrate the power meter and
sensor combination. You should always zero the power meter prior to
calibrating it.
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Zeroing adjusts the power meter for a zero power reading with no power
applied to the power sensor. During zeroing the wait symbol is displayed.
To zero the power meter and sensor:
Press
and the channel
softkey. The
message and
wait symbol are displayed. On dual channel meters you can zero both
channels sequentially by pressing
. During zeroing the wait
symbol is displayed.
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Zeroing of the power meter is recommended:
• when a 5
0
C change in temperature occurs.
• when you change the power sensor.
• every 24 hours.
• prior to measuring low level signals. For example, 10 dB above the
lowest specified power for your power sensor.
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Calibration sets the gain of each power meter channel and sensor
combination using a 50 MHz 1 mW (0 dBm) signal. Use the power meter’s
POWER REF as a traceable power reference or a suitable external
reference signal. An essential part of calibrating is setting the correct
reference calibration factor for the power sensor you are using. You must
manually enter the reference calibration factor for an 8480 series power
sensor. The reference calibration factor is automatically set for all
E-series sensors.
Zero
Cal
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E4416-90023.book Page 38 Thursday, August 9, 2001 9:17 AM