14
To change the Measure parameter, press the Measure key until the LED lights
under the desired parameter.
Sync Input
The user may connect a TTL level sync frequency at the Sync Input. EXT+ or
EXT- sync must be selected and the frequency must remain within the limits
defined above in the FREQ section. The UNLCK LED will blink if the Sync
Input frequency is outside the limits.
Synthesizer Output
The instrument provides the user with a TTL level square wave output for use
in experiments. The Synthesizer Output frequency is adjusted by setting the
FREQ parameter from the front panel or via IEEE-488. With INT sync active,
the frequency will be limited as given above in the FREQ section. With EXT+,
EXT- or V
ext
, the Synthesizer Output ranges from 4.00 Hz to 99.9 kHz.
F
outer
The instrument provides the user with a TTL level square wave generated
from an optical pick-up on the chopper head.
ACT
The ACT LED indicates when the IEEE-488 interface is busy.
UNLCK
The red UNLCK LED indicates when the chopper is not synchronized to an
internal or external sync frequency. The UNLCK LED will blink when an
external sync frequency exceeds the limits for a particular wheel.
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