ER-7C Microphone

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  • ER-7C Microphone

ER•7C Probe Microphone Series B

Quick Overview

ER-7C Series B Clinical Probe Microphone System
The ER-7C Series B microphone has an equalized flat frequency response to 10 kHz, providing accurate measurements even in small ear canals. It contains a convenient built-in calibrator, and the preamplifier is battery operated, preventing ground loop problems.


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Probe Microphone

  • Probe microphone for real ear measurement
  • Equalized flat frequency response to 10 kHz
  • Electrostatic-discharge protection
  • Accurate measurements in all ear canals
  • Touch-proof connectors
  • Radio-frequency interference (RFI) rejection
  • Battery operation prevents ground loop problems
  • Convenient built-in 1 kHz calibrator: 94 dB SPL = 94 dB uV RMS

System Includes

  • Microphone and cable assembly
  • Preamplifier
  • 20 probe tubes
  • Hook-and-loop headband
  • Earhook
  • Shirt clip
  • Carrying case

Instructions For Use

Technical Specs

Calibrator built into preamplifier 94 dB SPL@ 1 kHz
Probe Tube .95 mm OD x .58 mm ID x 76 mm long (approx. 3.0") medical grade silicone rubber
Sensitivity (@1 kHz) SPL at 0.1v 50 mV/Pascal (-46 dB re 1 V/u Bar): 0 dB SPL = 0 dB uV
Limits ± 1 dB at 1 kHz; ± 2 dB between 250 and 10 kHz
Output Impedance 235 Ohms, typical
Undistorted Output 126 dB SPL (2 Volts) min., 5 mA min. in "0 dB" position
(140 dB SPL min. in "-20 dB" position)
Noise Level 55 dB SPL equivalent 20 Hz to 20 kHz bandwidth, typical
45 dB SPL equivalent 20 Hz to 5 kHz bandwidth, typical
Acoustic Polarity Positive acoustic pressure gives positive voltage
Temperature Range of Operation 0-50° C
Humidity 0-95% relative humidity, non-condensing
Microphone Cable Replaceable, 2 m (78") two-conductor miniature, with shield
Battery Life Approx. 200 hours
Technical Specifications

The ER-7C Series B probe microphone has an equalized flat frequency response from a small-diameter .95 mm O.D. probe tube. The equalization network is contained in an accompanying preamplifier and is individually adjusted for each microphone. A built-in acoustic calibrator provides a tone of 94 dB SPL at 1 kHz. The preamplifier is battery operated (9-volt alkaline battery) which prevents ground loop problems when the probe system is connected to other equipment. When the green test indicator does not illuminate during calibration operation, replace the battery.

High Attenuation Probe Tubing


The following accessories are compatible with this product:

ER7-01 2m Cable Assembly

ER7-01 2m Cable Assembly

Single Cable

ER7-14C Replacement probe tubes

ER7-14C Replacement probe tubes

Package of 20 tubes


Ratings & Reviews