C995 Optical Chopper
Features:● Large 5 Digit LED Display● Frequency resolution of 0.001 Hz● External Clock Synchronization● Covers 4 Hz to 5 KHz with only one blade● Computer Interface for easy control● Enclosed Chopper BladeT

4Hz to 5KHz Optical Chopper

he C995 is a microprocessor-based control system that utilizes direct-digital-synthesis to deliver precise opticalchopping 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. Additionally, the C-995 is equipped with a bidirectional
Rs-232 port that permits the user to set the desired chopping rate to a resolution of .001 Hz and to read the statusof the instrument.
The C995, designed with a phase-locked-loop control system, allows the chopping rate to also be synchronized toa user-supplied external clock ranging from 4 Hz to 5 KHz. The controller is then used to measure and display thefrequency of the external clock.
The C995 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 inadvertent damage. (An optional open blade version is also available.)
There are two apertures and two sections on the blade (30 slots and 3 slots) for the high and low frequency ranges,respectively. The aperture diameters are 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 opticalsetups. Dual #8-32 mounting holes permit the apertures to be placed at a height as low as 0.75 inches above anoptical 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 convenience 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 andour guarantee of customer satisfaction.

Terahertz Technologies Inc.

Made In the USA

169 Clear Rd., Oriskany NY 13424
Toll Free: 888-U.S.- OTDRS
Phone: 315-736-3642 Fax: 315-736-4078
E-mail: sales@teratec.us
Web: www.teratec.us

C995 Optical Chopper
Specifications
Chopping Frequency Range

4 Hz to 500 Hz ( Inner slots), 40 Hz - 5 KHz (outer slots)

Aperture Size(3 Slot) 0.6 inch diameter (15 mm), and(30 Slot) 0.6 inch by 0.2 inch (15 x 4.5 mm)

Frequency Control

Phase-Locked-Loop, Direct Digital Synthesis

Frequency Uncertainty±.0025 % of setting

Phase Jitter (Internal Operation Only)

0.1 % peak to peak, 3 slot section, 1.0 % peak to peak, 30 slot section

Settling Time to Phase Lock

< 3 seconds

External Clock Input Requirements

TTL, CMOS Compatible Square Wave, 4 Hz to 5000 Hz

Sync Signal Output

TTL, CMOS Compatible Square Wave

Display

Five Digit, high intensity green, 0. 5 “ highTemp. Coefficient of Chopping Frequency< 10 ppm/CFrequency Resolution (W/Rs-232 Control).001 Hz

Frequency Resolution (W/Front Panel Control).01 HzCounter Resolution using External Clock

0.1 Hz, 1 Hz

Rs-232 Interface

9600 Baud, N-8-1, 3 wire

Chopper Head MountingStandard 8-32 tapped holes, mounting rod and stand is provided

Chopper Blade Diameter4.1 inch diameter

Operating Temperature Range

0 - 40 CDimensions (Head)

4.5 “ H x 4.5 “ W x 2 “ D, 114 mm x 114 mm x 51 mm

Dimensions (Controller)

2.7 “ H x 7 “ W x 9.1 “ D, 69 mm, 178 mm, 231 mm

Interconnecting cable supplied

Coiled Cord 10 feet max length

Power Requirements

95-260 VAC, 50-60 Hz, 15 VA Max

CE Certification

Yes

Weight3 lbs, 1.36 Kg

Accessories Provided

Mounting rod and stand, Rs-232 cable, Power Cord, Operating Manual

Standard Warranty

One year, Components and Workmanship, 30 Day Satisfaction Guarantee

Application Software Provided

Downloadable from TTI website, www.teratec.us

Part Numbers
C995

4 Hz to 5KHz Optical Chopper with Closed Head (5/8” Apeture) and 3/30 Slot Blade

C995-OH

4 Hz to 5KHz Optical Chopper with Open Chopper Head and 3/30 Slot Blade

C995-34 Hz to 500Hz Optical Chopper with Closed Head (1” Aperture) and 3 Slot Blade

C995-OH-3

4 Hz to 500Hz Optical Chopper with Open Chopper Head and 3 Slot Blade

C995 -Blade

3/30 Slot Blade

C995 -Blade-3S

3 Slot Bladewww.phototechnica.co.jp〒336-0017 埼玉県さいたま市南区南浦和 1-2-17

Made In the USA

TEL:048-871-0067 FAX:048-871-0068

e-mail:voc@phototechnica.co.jp

TTI makes every effort to insure all statements and information for the products referred to in this document areaccu-rate and reliable. TTI can not accept any
responsibility for errors, omissions or miss statements,
nor can they accept responsibility for any actions taken
based on the informa-tion demonstrated herein. TTI
reserves the right to make changes of any kind to theproduct referred to in this docu-ment without prior notice.
© 1/2021 Terahertz Technologies Inc.