BIRD THRULINE 4027F series User Manual

Operating 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). Table 1 displays the error codes and Table 2 lists the function limits.
Table 1 Error Codes
Table 2 Function Limits
Audible Warning
If the RF power level exceeds 120 % of the power sensor’s maximum power capability, the power 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 Overrange
Power < 3 % of low range Underrange
SWR
FWD < 20 % of low range Underrange
FWD – RFL = 0 Overrange
Return Loss
FWD < 20 % of low range Underrange
RFL < 20 % of low range Underrange
Return Loss > 40 dB Underrange

BIRD THRULINE 4027F series Specifications

General

Brand	BIRD
Model	THRULINE 4027F series
Category	Measuring Instruments
Language	English