Astatic CTM 77 manual Specifications, Architects’ and Engineers’ Specification

Specifications

Generating Element:

Electret condenser (Phantom Powered)

Polar Pattern:

Unidirectional (Cardioid)

Frequency Response:

50 Hz - 18 kHz

Output Level:

Open Circuit Voltage:

-55 dB (0 dB = 1 volt per microbar)

Impedance:

500ohms

Dynamic Range:

110dB

Equivalent Noise Level:

Less than 22 dB, A weighted

Maximum SPL:

132dB (1% THD, open circuit)

Powering:

Supply Voltage:

9 - 52 Vdc, positive pins 2 & 3 reverse polarity protected

Current Required:

Less than 5 mA over operating voltage range

Phasing

Positive pressure on diaphragm generates a positive voltage on pin 2 relative to pin 3

Grille Screen:

Hardened Steel Mesh

Case:

Steel and die cast zinc alloy

Finish:

Durable soft feel, non-slip, midnight black.

Dimensions:

(See drawing on other side)

Architects’ and Engineers’ Specification

The microphone shall be an electret condenser type, low impedance with wide-range frequency response, uniform from 50 Hz to 18 kHz. Output level at 1 kHz shall be -55 dB (0 dB = 1 volt per microbar). The polar response shall show a minimum of -15 dB at 180 degrees between 300 Hz and 1500 Hz. The transducer shall be isolated from handling noise and other mechanically generated vibration. The microphone case shall be steel and die-cast zinc alloy. The microphone shall have a length of 6 25/32" and a maximum diameter of 1 13/16". The microphone body shall be finished in a soft feel, non-slip midnight black.Asnap-in clamp and a zippered vinyl protective pouch shall be supplied.

The Astatic Model CTM 77 is specified.

SPECIFICATIONS FOR CTM 77

@ 1 kHz

TWO-YEARLIMITEDWARRANTY

Astatic Microphones are warrantied for two years to the original purchaser from the date of purchase by Omnitronics, LLC to be free from defects in material and workmanship. In event of such defect, product will be repaired or replaced at Omnitronics, LLC discretion with a new unit of equal or superior value. This will be at no charge if delivered prepaid to Omnitronics, LLC, together with the proof of purchase and a Return Authorization Number. The unit will be returned promptly prepaid. Warranty excludes exterior finish, appearance items, or malfunction due to abuse or operation under other than specified conditions. Consequential or incidental damages are excluded. Serial number of product and original purchaser’s name must be registered immediately after purchase. Please use the attached registration form for this purpose.

This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts, so the above exclusions and limitations may not apply to you.

Note: No other warranty, written or oral is authorized by Omnitronics, LLC.

SHIPPING INSTRUCTIONS

Please call our customer service department at 440-593-1111 for a pre-approved return authorization number and carefully repack the unit and return it to: Omnitronics, LLC, 341 Harbor St., Conneaut, OH 44030

ALL RETURNS MUST HAVE A PRE-APPROVED RETURN AUTHORIZATION NUMBER OR IT WILL BE REFUSED.

If outside the United States, contact your dealer or distributor for warranty details.