Distance to fault (dtf) measurement, Ч10 2 f ∆ ч – Bird Technologies SA-1700-P User Manual
Page 107
Maintenance
97
Maximum Input Signal
(Damage Level)
≥ 22 dBm
Output Power
< 0 dBm
Distance to Fault (DTF) Measurement
Mode:
Internal
Resolution [R]
X-Axis:
Where R=Resolution (meters),
V
p
=Velocity of propagation
†
,
∆F= Frequency span
Y-Axis:
0.1 dB, 0.01 VSWR
Range
X-Axis:
Y-Axis:
238 x R
0 to –60 dB
Accuracy
X-Axis:
Y-Axis:
± 2% of full-scale range with V
p
= 1
Same as for Return Loss Measurements
V
p
Range:
0.20 to 1.00, or 1.00 to 99%
*
Accuracy only guaranteed when using a Bird Type B Calibration
Combo (See page 101).
†
Dielectric Constant – The dielectric constant
(ε
r
) of the antenna cable
determines the propagation velocity of the cable (V
p
=
1
⁄
√ε
r
), which
together with the frequency range of the match data, determines the
maximum distance for which the calculation can be done without
aliasing errors.
R
V
p
3
Ч
8
Ч10
2
F
∆
Ч
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≡