Wideband Power Sensor (Wps); Zeroing Sensor; Video Filter - BIRD 5000-XT Libro De Instrucciones

Digital Power Meter Model 5000-XT

Wideband Power Sensor (WPS)

A status LED on the front lights when the WPS is powered, and blinks when the
WPS is connected to the DPM.

Zeroing Sensor

Over time, the sensor's "zero value" (reading with no applied RF power) can
drift due to environmental factors (temperature, humidity, etc.) This can make
the readings performed by this sensor less accurate by the drift value. If the drift
would be a significant error, re zero the sensor.
1. Make sure the sensor has reached a stable operating temperature.
2. Make sure no RF power is applied to the sensor.
3. Press and hold "0" for two seconds to begin zero calibration.
Note: "Zero/Cal" will be displayed and calibration will begin.
Note: Zeroing the sensor takes 60 seconds. The bar graph will dis-
play calibration progress.
Note: When complete, "PASS" should be displayed.
4. Press Enter to return to normal operation when zeroing is complete.
Note: c.If "FAIL" is displayed, make sure no RF power is applied to
the sensor and perform the procedure again.

Video Filter

Except for average power and VSWR measurements, all measurements use a
variable video filter to improve accuracy. This filter can be set to either 4.5 kHz,
400 kHz, or Full bandwidth.
Note: It should be as narrow as possible while still being larger
than the demodulated signal bandwidth (video bandwidth). Nar-
rowing the filter limits the noise contribution from interfering sig-
nals.
Table 1 lists some common modulation schemes and the appropriate video
filter.
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WARNING
Do not interrupt the calibration.