Thruline RF Power Meter, Model 4421
35
Functional Test
1.
Turn the power meter off. The ON/OFF switch on the
rear
panel should be OFF and the ac power cable should
be connected.
2.
Turn ON the ON/OFF switch on the
rear
panel of the meter.
3.
While holding down the FWD and SWR push buttons, press the ON/OFF button on the
front
panel of the power
meter. Immediately release all three.
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 37
).
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 36
). 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
Figure
12 on page
25
.
