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When INT Sync is selected, the synthesizer frequency will be restricted to the
working range of the particular chopping wheel. In H/S mode this range will
be modified by the setting of H and S. In this case, the range limits may be
calculated as follows:
F
upper
= F
outer
[highest] · (S/H) and
F
lower
= F
outer
[lowest] · (S/H),
where S,H = 1 - 15.
Setting FREQ The synthesizer frequency may be set to three significant
digits. The significant digit to be modified may be selected by the left arrow
and right arrow keys. The magnitude of the digit may be changed with the up
arrow and down arrow keys. If the display overflows or underflows, the display
will change the Hz/kHz LEDs and the decimal point to maintain three signifi-
cant digits of resolution.
PHASE The phase delay may be set from +179.0° to -180.0°. The phase
shift is always referred to the chopping frequency F
outer
. In NORMAL and +/-
modes F
outer
= F
sync
. In H/S mode F
outer
= [H/S]·F
sync
.
When the phase adjustment is active, the DEG LED will be lit. The left arrow
and right arrow keys select the significant digit to be modified, and this digit
will blink. The up arrow and down arrow keys change the magnitude of the
digit.
H In H/S mode the user may lock the chopper to a harmonic of the sync
frequency. H is set to the harmonic of interest. Use the up arrow and down
arrow keys to set H from 1 to 15.
S The user may lock the chopper to a subharmonic of the sync frequency. S
is set to the subharmonic of interest. Use the up arrow and down arrow keys to
set S from 1 to 15. S and H may be set in any combination. Changing S only
has an effect when the chopper is in H/S mode.
STORE The user may store an instrument set-up in one of two ways. First,
the control unit will retain the control settings when the power is removed.
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