Bird Technologies 4421 - Manual (Page 21)

9
Chapter 3 Operating Instructions
This chapter describes operator controls and indicators on the Bird 4421 RF
Power Meter. 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 7 Push Buttons
Push Button Description
FWD, RFL Press to measure forward or reflected RF power. FWD or 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.
 Note: 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.
 Note: Used while AUTO indicator is on. Stops automatic
scaling. AUTO indicator turns off.
ON/OFF Press to turn the power meter on or off. This switch will not work if the
master power switch on the rear panel is OFF.
 Note: The display flashes for about 30 seconds when the
unit is first turned on.
LISTEN TALK LOCAL LOCKOUT
FWD
AUTO
LO BAT
REMOTE
MODEL 4421 RF POWER METER
AUTO
RANGE
UP
DOWN
SWR RFL FWD MIN MAX dBm LIGHT ON / OFF
MW nW
KW µW
W mW
dBm FWD
RFL
SWR