Keithley 3940 Service Manual page 44

Multifunction synthesizer
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ELECTRICAL SPECIFICATIONS (CONT.)
sync output
Output Voltage
Output impedance
Connector
TTL Level
Approximately 5OG, unbalanced
BNC receptacle on front panel
External Add Input
(An external signal input is added (summed) to main synthesizer waveform output).
Gain of External Add Input
Total set* Voltage (Peak)
Gain2 (/OPEN)
1v to 1ov
1
1OOmV to 1V
l/10
1OOmV to 1OmV
l/100
Gain3 (/5OLa)
l/2
l/20
l/200
1mV to 1OmV
Maximum External Input (Vpeak) = 10 -Total Set Voltage/Gain
l/1000
~1/2000
* Total Set Voltage =
Set AC Amplitude (Vp-p)
2
+ I Set DC Voltage 0 I
Total Set Voltage = I Set DC Voltage (v) I when waveform is DC.
r Gain = Main synthesizer output signal value
I
External Add Input Signal value
3 Gain is l/2 of the /OPEN value with a 5OQ load (/5OR)
Input impedance
Approx. 1OOk.G
Frequency range
DCto1MHz
Connector
BNC receptacle on rear panel
Phase
Range
l-360' to 360'
Display
1 Max. 4 digits and minus sign, resolution 0.1 (fixed)
Oscillation start phase for burst/trigger/gate
oscillation
Oscillation will restart at this phase when the $ SYNC key is pressed or when the GPIB "SYN" command is given during independent or
master operation.
In addition, slave unit oscillation will restart at this phase when the Q SYNC key of the master unit is pressed or when the GPlB "SYN"
command is given.

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