3502
Optical Chopper System
28
3.5
Back Panel Operation
The back panel of 3502 Optical Chopper Controller provides the functions
operation described below.
Figure 13:
Model 3502 Optical Chopper Controller back panel.
CAUTION
Do not block the rear panel of the Controller. Ensure a minimum clearance
of 30” for adequate ventilation of the device. Blocking the normal
convective airflow around the unit, or thermally insulating the unit, can
result in severe injury, damage to the product, and/or fire.
OUT 1
The function of the
OUT 1
output depends on the instrument’s operating mode. In
H/S
mode, the instrument provides a TTL-level signal at frequency (H/S)·F
sync
. In
+/-
mode the frequency at
OUT 1
is F
outer
- F
inner
, and in
NORMAL
mode the frequency
is 5·F
outer
. This information is also summarized in Table 2 on page 27.
OUT 2
The function of the
OUT 2
output depends on the instrument’s operating mode. In
H/S
mode, the instrument provides the user with a TTL-level signal at frequency
[H/(7·S)] ·Fsync. In
+/-
mode the frequency at
OUT 2
is F
outer
+F
inner
. In
NORMAL
mode the frequency is F
inner
. This information is also summarized in Table 2 on
page 27.
V
ext
The
V
ext
BNC input connector can be used to supply an external 0 to -10 V DC
voltage. When the
Sync
setting is
V
ext
, the user may drive the Chopper motor
directly with this input DC voltage. In this case, 0 to -10 V DC corresponds to 0
to 100% of the highest motor speed, respectively.