Bird Technologies 3140 Display - Manual (Page 24)

Bird Electronics Corporation
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* - Peak to Average ratio is specified based on the fullscale
power of the specific TPM model. For example, a TPM with a
fullscale forward power rating of 1 kW will provide accurate
readings for signals with peak powers up to 10 kW. If the TPM is
operated below its fullscale power rating, the peak / average
rating will increase by the difference between the fullscale value
and the operating power. For example, if a 1 kW TPM is oper-
ated at 700 W, the new peak/ average ratio would be 11.5 dB.
Line Size Power Range Fullscale (kW)
7/8”
Very Low
Low
Medium
High
Very High
0.1
0.5
1.0
2.5
5.0
1 - 5/8”
Very Low
Low
Medium
High
Very High
0.5
1.0
2.5
5.0
10.0
3 - 1/8”
Very Low
Low
Medium
High
Very High
2.5
5.0
10.0
25.0
50.0
RF Specs
FWD / RFL Ratio Reflected fullscale power is 1/10 of forward
fullscale power.
Peak/Average Ratio 10 dB min*
Main Line Insertion Loss 0.2 dB max, 0.08 dB typical
Main Line VSWR 1.1 max
Testport VSWR 1.5 max, 1.3 typical
Accuracy ± 5% of reading (2s) after zeroing sensor, if
calibrated by Bird. This does not include
user mismatch uncertainty and user
voltmeter uncertainty. If not calibrated by
Bird, add the uncertainty of the calibration
method and reference standard. Derate
accuracy by 1% if not at 25 ± 10 °C.
Dynamic Range 16 dB min
Directivity, Rfl 26 dB min, 30 dB typical
Measurement type In-line, true-average power
Calibration Unit can be calibrated by user by adjusting
pot to get 4V output for a fullscale RF input.
Recommended Cal Interval 1 year