C9950 pages

C-995
Variable Speed
Microprocessor
Controlled
Optical Chopper

Benefits:
• Wide Frequency Range
• Single Blade 4 Hz - 5 KHz
• Crystal Controlled Stability

• External Clock Synchronization • Enclosed Blade
• Frequency Resolution 1mHz
• Bright 5 Digit LED Display
• Adjustable Aperture Height
• Bidirectional Rs-232 Port

The C-995 is a microprocessor-based control system
that utilizes direct-digital-synthesis to deliver precise optical chopping rates from 4 Hz
to 5000 Hz. Equipped with a
large five-digit LED readout,
the C-995 controller enables
digital entry of the desired
chopping rates from the front
panel. Additionallly, the C-995
is equipped with a bi-directional
Rs-232 port that permits the
user to set the desired chopping rate to a resolution of .001
Hz and to read the status of
the instrument.
The C-995, designed with
a phase-locked-loop control
system, allows the chopping
rate to also be synchronized

to a user-supplied external
clock ranging from 4 Hz to 5
KHz. The controller is then
used to read the frequency of
the external clock.
The C-995 chopping head
is attached to the controller by
means of a 10 foot coiled cord.
The precision etched blade is
fully enclosed for protection
from inadver tent damage.
There are two apertures and
two sections (30 slots and 3
slots)for the high and low frequency ranges, respectively.
The aperture diameter is 15
mm with a slot width of 4.5 mm
(30 slot section) or 30 mm (3
slot section).
The small 4.75 inch square
outline and two inch maximum

depth permits easy integration
into compact optical setups.
Dual #8-32 mounting holes
permit the apertures to be
placed at a height as low as
0.75 inches above an optical
bench, or with the included 1/2
inch rod and stand, as high as
13 inches above the mounting
surface
The ease of use and
convience of this instrument
are matched only by the high
performance to price ratio that
is typical of products from
Terahertz Technologies Inc.
The C-995 is backed by our
standard two year warranty
and our guarantee of customer
satisfaction.