Bird-technologies 5000 Series Manuel d'utilisateur télécharger pdf (Page 29)

Operation

Terminating Power Sensor

Zeroing Sensor

Over time, the sensor’s “zero value” (reading with no

applied RF power) can drift, making all readings

inaccurate by this value. For example, if the zero value

is –2 µW, measuring a 5 mW signal will give a reading

of 4.998 mW, a 0.04% error. Measuring a 50 µW signal

will give a reading of 48 µW, a 4% error. If the drift

would be a significant error, rezero the sensor:

y Make sure the sensor has been connected to the

DPM and the DPM turned on for at least 5 minutes.

y Make sure no RF power is applied to the sensor.

y Press and hold 0 for at least three seconds. “CAL 0”

will be displayed and calibration will begin.

y Zeroing the sensor takes 60 seconds. The bar graph

will display calibration progress. When complete,

“0 CAL PASS” should be displayed. Press ENTER to

return to normal operation. If “0 CAL FAIL” is

displayed, make sure no RF power is applied to the

sensor, press ENTER and zero the sensor again.

TPS-EF

The Bird 5011-EF uses frequency correction factors to

provide more accurate measurements. To use these,

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.

CAUTION

Do not exceed 2 W average or 125 W peak power for

5 µs when using the TPS or the TPS-EF.

Doing so will render the sensor inoperative.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 47 48

Pas de commentaire

Bird-technologies 5000 Series Manuel d'utilisateur Page 29