3-20
888-2685-001
12/24/07
WARNING: Disconnect primary power prior to servicing.
Ranger Commissioning Manual
Section 3 Operation and Adjustments
3.7.3
Forward and Reflected Power Calibrations
The following procedure is used to calibrate the forward and reflected power readings
via the Output Setup screen. The forward must be calibrated first, then the reflected can
be calibrated. The procedure requires a digital power meter and a 10dB pad. Since
calibration is relatively easy and quick, it is recommended that both forward and
reflected always be calibrated together.
Forward Power
STEP 1
Connect the digital power meter to the forward power (incident) port on
the directional coupler either before or after the filter. For the location of
these ports see Figure 2-1 on page 2-2, designated B and R. The cables
numbers connected to these ports are #40 for the Total output and #42 at
the filter input.
STEP 2
Measure the power at the forward coupler. The coupler comes with a
table of precision coupling values for the various UHF channels which
should be used as the offset for the digital power meter. Make sure the
coupler serial number matches the coupling table. The coupling values
are also written on stickers which are attached to the couplers at the
factory.
STEP 3
Press the CHANGE button to select the coupler being calibrated (before
or after the filter) and then use the +/- buttons to make the displayed
power match the measured value on the digital power meter.
STEP 4
Press SAVE to store the setting or CANCEL to discard the changes.
Reflected Power
STEP 5
Press the CHANGE button for the desired reflected coupler (before or
after the filter). This temporarily disables the reflected power fault.
STEP 6
Note the forward power and remove the power meter from the forward
coupler. Connect the 10dB pad to the forward power coupler.
STEP 7
Remove the cable from the reflected coupler to be calibrated and connect
it to the 10dB pad. The cables are labeled #50 for the Filter input and
#39 for the Total reflected.
STEP 8
Use the +/- buttons to set the reflected reading on the GUI to 10% of the
forward reading noted earlier.
STEP 9
Press SAVE to store the setting or CANCEL to discard the changes.
Summary of Contents for Ranger Series
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