BIRD THRULINE 4020 series, Инструкция

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Bird 4421 RF Power Meter
12
Error Codes
The Bird 4421 displays error codes when the RF power is either below the
selected range (underrange) or above the selected range (over r a n ge). F igu r e 8
displays the error codes and Figur e 9 list s t h e fu n ct ion lim it s.
Audible Warning
If t h e RF power level exceeds 120 %
capability, the power meter will sound a warning buzzer.
Figure 8
Error Codes
Symbol Explanation
Va lu e gr ea t er t h a n over r a n ge lim it of fu n ct ion
Va lu e less t h a n u n der r a n ge lim it of fu n ct ion
Figure 9
Function Limits
Function Limit Error
F WD, RF L P ower > 199.9 % of fu ll sca le or 120 %
of t op r a n ge Overrange
F WD dBm , RF L
dBm P ower > 120 % of fu ll sca le
P ower < 3 % of low r a n ge Overrange
Underrange
SWR F WD < 20 % of low r a n ge Underrange
Overrange
Ret u r n Loss F WD < 20 % of low r a n ge
RF L < 20 % of low r a n ge
Ret u r n Loss > 40 dB Underrange
Underrange
Underrange