Bird Technologies 4421 User Manual
Page 48
Bird 4421 RF Power Meter
36
PROBLEM
POSSIBLE CAUSE
CORRECTION
Power meter has
no power
Have the batteries been
charged?
Recharge the batteries.
Is the power meter’s ac
power cord connected?
Connect the power cord.
Is the ON/OFF rocker switch
on the rear panel set to
OFF?
Set the switch to ON.
(Cal Cart only)
Is the Cal Cart’s AC power
cord connected to the AC
line?
Connect AC power.
Blown fuse?
Check fuse rating and replace fuse
(See “Replacing Fuses” on
page 39).
Dash moves
across the display
Is the sensor cable
connected to both the power
meter and power sensor?
Connect sensor cable.
Is the sensor cable
defective?
Replace sensor cable.
Display blank or
not updating
Have the batteries been
charged?
NO: Recharge battery
YES: Return meter for service.
Power meter turns
off while on battery
power
Is “LO BAT” displayed?
YES: Recharge battery
NO: Return meter for service.
Push buttons do
not respond
Test the push buttons (See
“Push Button Test” on
page 37). Are they
defective?
Return meter for service.
Every segment on
the display is lit
Return meter for service.
IEEE-488
Interface does not
respond to the
interface link
Are the address in the
interface program and the
address setting on the DIP
switches on the interface
module the same?
Change the program or DIP switch
setting so that the addresses are
the same (See “Dip Switch” on
page 12).
Send the “J0” self test
command, then check the
status. Does the power
meter fail the self test?
Replace I/O hub PCB.
Is the IEEE cable defective?
Replace IEEE interface cable.
RS-232 Interface
does not respond
to the interface
link. Fails J0 self-
test command.
Are the DIP switches set
correctly?
Set DIP switches.
Is the RS-232 cable
defective?
Replace RS-232 interface cable.
With the RS-232,
the power meter
displays “TALK”
but does not
operate as
expected.
Is DIP switch 2 set correctly? For “talk/listen” operation, set this
switch to ON. For “talk always” set
this switch to OFF.
Is DIP switch 1 set correctly? Set DIP switch 1 as indicated in