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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:
500 ohms
Dynamic Range:
110 dB
Equivalent Noise Level:
Less than 22 dB, A weighted
Maximum SPL:
132 dB (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)
SPECIFICATIONS FOR CTM 77
TWO-YEAR LIMITED WARRANTY
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.
@ 1 kHz
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. A snap-in clamp and a zippered
vinyl protective pouch shall be supplied.
The Astatic Model CTM 77 is specified.
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.