Stanford Research Systems DS345, Manual

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DS345 FEATURES
2-7
12) Units LEDs
These LEDs indicate the units of the displayed value. If no LED is lit the num-
ber displayed has no units.
Rear Panel Features
FUSE: 3/4A (100/120VAC) or 3/8A (220/240VAC)
TRIGGER AM(EXT) TIMEBASE
TRIGGER MODULATION 10MHz
SWEEP MARKER BLANK/LIFT
TTL 0-5V 10MHz
TTL 0-5V 1V
TTL TTL 0-10V
INPUTS
OUTPUTS
WARNING: No user serviceable parts inside.
Refer to operation manual for safety notice.
For use by qualified laboratory personnel only.
!
IEEE-488 STD PORT (GPIB) RS232 (DCE, 8d, 0p, 2s bits)
1
2
3
4
5
1) Power Entry Module
This contains the DS345's fuse and line voltage selector. Use a
1
amp fuse
for 100/120 volt operation, and a
1
/
2
amp fuse for 220/240 volt operation. To
set the line voltage selector for the correct line voltage first remove the fuse.
Then, remove the line voltage selector card and rotate the card so that the
correct line voltage is displayed when the card is reinserted. Replace the
fuse.
2) External Inputs
Trigger Input
The trigger input is a TTL compatible input used to trigger modulation sweeps
and bursts. This input has a 10 k
Ω
input impedance. The shield of this input is
tied to that of the function output and may be floated up to ±40V relative to
earth ground.
AM Input
The AM input controls the amplitude of the function output. This input has a
100 k
Ω
input impedance and a ±5V range, where +5V sets the output to
100% of the front panel setting, 0V sets the output to 0, and -5V sets the out-
put to - 100% of the setting. The 0 to 5V range is used for normal AM opera-
tion, while the ±5V range is used for DSBSC modulation. This input is always
active and should
only
be be connected if AM is desired. The shield of this in-
put is tied to the shield of the function output and may be floated up to ±40V
relative to earth ground.