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SECTION 3
Operation
Fuse
Keithley
Line
Current
Part
Voltage
Rating
Number
1 lOV, 120v
1A
FU-96-2
220,240V
c
0.5A
I-
F-U-96-1
NOTE Fuses are 5
x
20mm and have 25OV, normal blow ratings.
WARNING
To avoid the possibility
of electric shock,
connect the Model
3933A to grounded
AC
outlet.
The fuse holder is located above, and to the left
of, the LINE connector. The fuse can be replaced
by disconnecting the line cord and unscrewing
the fuse holder cap with a screwdriver. Replace
only with the type indicated below.
3.3
STARTUP
1. Check that the supply voltage switch is set at the
proper position for the supply voltage. The allow-
able supply voltage range is flO% of the voltage at
which the supply voltage switch is set.
CAUTION
Operating
the Model 3933A in an incorrect
line voltage may result in damage to the unit.
2. Make sure that the power is off, then plug the sup-
plied power cable firmly into the LINE connector on
the rear panel of the Model 3933A. Insert the power
plug into a grounded AC power receptacle.
WARNING
To avoid the possibility
of electric shock, use
only a grounded AC receptacle for the power
connection.
Turn on Model 3933A power by pressing in on the
front panel POWER switch. Power is ON when the
POWER switch button is depressed (in); power is
OFF when the POWER switch button is released
(out). When the power is turned on, the Model
3933A will begin normal operation, and the liquid
crystal display backlight will turn on.
3-14
3. When the power is first turned on, the Model 3933A
will return to the settings in effect prior to the last
power-off, and the unit will display the phase shif-
ter's main parameters.
If the previous settings were not stored correctly, the
error code "Er MEMOll"
message is displayed, fac-
tory preset parameters will be placed into effect and
displayed. At this point, parameters in effect prior to
the preceding power-off will be lost. This situation
occurs when the memory backup battery has insuffi-
cient charge, and memory data cannot be main-
tained.
A fully-charged battery can retain memory for ap-
proximately 60 days. This period, however, varies
slightly with ambient temperature and from one bat-
tery to another. Approximately
50 hours, with the
unit connected to line power, are required to fully
charge a dead battery.
When the battery no longer sustains sufficient
charge for practical use, contact your Keithley repre-
sentative or the factory for information on obtaining
a replacement.
4. The backup battery may be discharged when the
Model 3933A is used for the first time after being
purchased, or if the unit has not been connected to
line power for a considerable length of time. Connect
the unit to line power for at least several hours to
charge the battery.
5. Sweep operation mode parameters are not stored
when the power is turned off. Therefore, turning the
power off during sweep operation, sweep hold, end
of single sweep, start phase output, or stop phase
output, will result in a loss of sweep state informa-
tion the next time power is turned on. At next power-
up, the LCD will, however, indicate the output
phase at the moment of previous shut-down.
Waveform output is not saved at shut-down and the
Model 3933A is shipped with waveform output set
to the "on" state during power-up sequencing. This
can be set to "off" via an internal jumper pin. See the
Model 3933A Service Manual for details.
6. If, at power-on, the phase shifter beeps and displays
error code "Er NODTW and the error message "NO
SYNTH DATA COMING", there is a missing, or im-
proper, digital signal at the rear panel of the slave
Model 3933A.
This situation can arise under the following condi-
tions:
0 Master Model 3930A power switch is in the "OFF"
position.
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