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SECTION 3
Operafion
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A cable is not connected between the slave Model
3933A and a master Model 3930A.
A digital cable is missing, or disconnected, between
successive Model 3933A units in a phase shifter
chain.
If, at power-on, the Model 3933A displays the error
code "ER FRDTO7", it indicates:
The last time the power was turned off the waveform
setting was "variable-duty-cycle"
square wave.
The master Model 3930's frequency exceeded
lookH.z.
In this case, the setting will automatically change to
duty-cycle fixed 50%.
If, at power on, the Model 3933A fails to operate in
one or more of the following conditions, contact
your Keithley representative or the factory to deter-
mine the correct course of action.
Unit does not power-up according to the mode and
settings in effect immediately before last power-off.
Unit does not power-up according to the preset op-
erating modes.
Main display does not appear.
Note: After turning off Model 3933A, wait at least
five seconds before turning it on.
NOTE
For precise measurement applications, allow
the Model 3933A to warm up for at least 30
minutes to allow internal circuits to stabilize.
3.4
OPERATING PROCEDURES
3.4.1
Setting Parameters Using Numeric
Keys
When the appropriate parameter key such as FCTN,
AMPTD, OFFSET, or PHASE is pressed, the parameter
narne and the present parameter value will be indicated
in the upper part of the liquid crystal display. The al-
lowed range of the parameter setting and useful help in-
formation will appear in the lower part of the liquid crys-
tal display.
The parameter value can be changed when the parameter
name indicated in the upper part of the liquid crystal dis-
play is flashing. The parameter name will not flash when
the unit is in the GPIB remote mode, or when the front
panel lock is enabled.
Some parameters, such as waveform, can be selected by
pressing a single numeric character. Changes are made
by simply pressing the numeric key corresponding to the
desired setting, as shown in the display. An error mes-
sage will be displayed if the entered value is outside the
allowed range. Other displays and internal settings re-
main unchanged when an error occurs. Values may be
changed as many times as desired, without leaving the
present display. Pressing DSPL returns the display to the
main settings and the final change will be indicated.
Example: Changing the waveform type from the present
QC sine wave) to I-L (square wave) or to A (triangular
wave).
Key Operation
1 Display
Result
I
Press FCTN.
Press 3
Press 2
Press 3
Press DSPL
Existing waveform selection
(<SIN>11 will be displa ed.
Waveform changes to < if >3
(square wave).
Waveform changes to < A >2
(triangle wave).
Waveform changes back to <n >3
(square wave)
Display indicates main settings,
including final choice CL >3
(square wave).
Parameters, such as amplitude and phase, which require
units (deg, V, dbV, etc.) can be changed as follows:
l
Press appropriate ENTRY key to select the desired pa-
rameter.
l
Enter new numeric value (for phase or amplitude)
with the numeric keys.
l
Press appropriate ENTER key to add designator (V,
deg, mV, etc.).
While entering the new value, the existing parameter
value, unit display, and modification step size will disap-
pear from the display,
and the new value will be dis-
played. To correct an entered value during the entry
process, press the RUB OUT key, which will delete one
character at the units position (immediate left of decimal
point) of the entered number. To re-enter the entire pa-
rameter value from the beginning, press the same pa-
rameter key to return to the corresponding parameter
setting.
3-15
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