BIRD THRULINE 4021, Instruction Book

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9
Chapter 3 Operating Instructions
This chapter describes operator controls and indicators on the Bird
4421 RF Power Meter. If your power meter is equipped for remote
operation using a GPIB or RS-232 controller, refer to the instructions
in Chapter 4 or Chapter 5 respectively.
Push Button Functions
Figure 6
Push Buttons
REMOTE LISTEN
FWD
RFL
SWR
TALK LOCAL LOCKOUT
AUTO
MW nW
KW W
W
dBm LO BAT
MODEL 4421 RF POWER METER
AUTO
RANGE
UP
DOWN
SWR RFL FWD MIN MAX dBm LIGHT ON / OFF
Push Button Description
FWD, RFL
Press to measure forward (reflected) RF power. FWD
(RFL) indicator and current unit of measure turn on.
SWR
Press to measure standing wave ratio. SWR indicator
turns on. Value displayed will be between 1.0 and 199.9
MIN, MAX
Used after pressing FWD, RFL, SWR, or dBm. Displays
the minimum (maximum) measured value of the previous
function as long as MIN (MAX) is held down.
dBm
Used after pressing FWD or RFL. dBm indicator turns on.
Power is displayed in dBm units.
Used after pressing SWR. Return loss is displayed.
LIGHT
Press to turn on or turn off the display’s backlight. If left
on, the light automatically shuts off after 30 minutes.
AUTO
Press to automatically set the scale. AUTO turns on.
UP, DOWN
Press to select the next higher (lower) scale. If the scale is
too high for the power sensor, an error will be displayed.
Used while AUTO indicator is on. Stops automatic
scaling. AUTO indicator turns off.
ON/OFF
Press to turn the power meter on or off.