Bird Technologies SCC8 Series-Manual - Manual (Page 24)

4421 Instructions
10
Error Codes
The Bird 4421 displays error codes when the RF power is either below the
selected range (underrange) or above the selected range (overrange). Figure 6
displays the error codes and Figure 7 lists the function limits.
Figure 6 Error Codes
Figure 7 Function Limits
Audible Warning
If the RF power level exceeds 120% of the sensor’s power range, the meter will
sound a warning buzzer.
Symbol Explanation
Value greater than overrange limit of function
Value less than underrange limit of function
Function Limit Error
FWD, RFL
Power > 199.9% of full scale or 120% of top
range Overrange
FWD dBm, RFL dBm
Power > 120% of full scale
Power < 3% of low range Overrange
Underrange
SWR
FWD < 20% of low range
FWD – RFL = 0 Underrange
Overrange
Return Loss
FWD < 20% of low range
RFL < 20% of low range
Return Loss > 40 dB Underrange
Underrange
Underrange