Keithley 3940 Service Manual page 50

Multifunction synthesizer
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ELECTRICAL SPECIFICATIONS (CONT.)
1 Modification
1 Operation
I By cursor movements with 4 , ) keys (flashing display), and by increments/decrements with
I
Increments/decrements
with the Modify knob
the Modify knob
Step size for cursor
movement
fl
Increases or decreases the cursor position value by 1.
x+2
Multiplies or divides the entire value by 2.
x+10
Muhiohes or divides the entire value bv 10.
I
I
I
I
I
For waveform, oscillation mode, sweep function, trigger source, and stop level, the step size available
is fl only and the cursor position is not displayed.
Automatic reneat
1 Presslnn the 4 , b kevs for 0.3s or more causes automatic reueat.
Non-modifiable parameters
Memory number, GPIB address, delimiter
Signal Output ON/OFF
Function
Operation
OFF condition
Simultaneously controls ON/OFF of FCI'N OUT of the main synthesizer and the sub synthesizer.
Factory default setting: Signal output ON at power-on.
ON/OFF toggles each time the FCTN OUT ON/OFP key is pressed.
Main synthesizer
FCTN OUT
Signal output will be open circuit.
!3YNc OUT
Identical to ON condition
Sub synthesizer
FCI'N OUT
Signal output will be OV
SYNC OUT
Signal output will stop oscillation at high level
and low level
Other Functions
Panel lock
Main synthesizer main parameter
display
Sub synthesizer main parameter
display
Calibration
Beep sound ON/OFF
Disables most front panel key entries and operating condition changes. Current parameter values
can be displayed. GPIB input and certain BNC inputs are enabled.
Main synthesizer frequency, waveform, oscillation mode, AC amplitude, DC offset, sweep
condition are displayed together.
Sub synthesizer frequency, waveform, amplitude, phase are displayed together.
Corrects main synthesizer AC amplitude error and offset error. FCTN OUT is OFF and SYNC OUT is
undefined during calibration
Controls ON/OFF of beep sound when panel keys are pressed (short beep), or when error has
occurred (lone beeo).

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