11
Mode
The Mode setting changes the reference signals available at OUT1 and OUT2
on the back panel as follows:
Mode F
outer
OUT1 OUT2
H/S [H/S]·F
sync
[H/S]·F
sync
[H/(7·S)]·F
sync
+/- F
sync
F
outer
- F
inner
F
outer
+ F
inner
NORMAL F
sync
5·F
outer
F
inner
To change the Mode, push the Mode key until the LED under the desired
Mode lights.
F
outer
is the chopping frequency of the outer set of slots as measured by an
optical pick-up on the chopper head. F
inner
is the chopping frequency of the
inner set of slots. For wheels with only one set of slots F
outer
is the chopping
frequency, and F
inner
is not defined.
F
sync
is the frequency of the Sync source. In INT Sync mode, F
sync
is the fre-
quency of the chopper's internal frequency synthesizer. In EXT+ or EXT- Sync
mode, F
sync
is the frequency of the externally supplied signal at the Sync
Input.
Set
The Set key selects which instrument parameter is modified by the cursor
keys. Press SET until the LED lights under the desired parameter. The up
arrow and down arrow keys will then change the parameter value. In some
cases, the left arrow and right arrow keys select the significant digit to be
modified.
FREQ The user may set the synthesizer frequency depending on the Sync
source selected. When EXT-, EXT+ or V
ext
sync has been selected, the fre-
quency may range from 4.00 Hz to 99.9 kHz.
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