Bird Technologies 5000-EX - Manual (Page 28)

Bird Model 5000-EX Digital Power Meter
16
TPS-EF
The Bird TPS-EF uses frequency correction factors to
allow more accurate measurements. Look at the label
on the side of the sensor and find the correction factor
for the frequency being measured. Add the correction
factor to the other attenuation or coupling factors and
enter this as an offset.
Wideband Power Sensor (WPS)
Zeroing Sensor
Over time, the sensor’s “zero value” (reading with no
applied RF power) can drift, making all readings inac-
curate by this value. For example, if the zero value is –
0.02 W, measuring a 50 W signal will give a reading of
49.98 W, a 0.04% error. Measuring a 1 W signal will
give a reading of 0.98 W, a 2% error. If the drift would
be a significant error, rezero the sensor:
"
Make sure the sensor has reached a stable
operating temperature.
" Make sure no RF power is applied to the sensor.
" Press Zero. Calibration will begin.
"
Calibration will take about 30 seconds. Do not
interrupt the calibration! A bar on the screen will
display calibration progress.
"
After a successful calibration, “Cal Pass” or
“Calibration Complete” will be displayed. Press any
key to return to normal operation.
"
If calibration fails, “Cal Fail” will be displayed.
Press a key to return to normal operation, then
check that the WPS is properly connected, and that
the RF is off. Rezero.