An electronic instrument with wood grain paterned sides, dull green coloured top and lower-front surfaces, and a slanted metallic console. The console has two centrally-positioned rectangular dials, as well as several knobs, buttons, and switches.
Attached to jacks at the back of the instrument is a “headset and transducer” assembly consisting of a headphone one earpieces, and a separate pneumatic probe terminating in a narrow metal ear probe. The headphone is labeled “Telephonics” and “TELEX”.
A grey-coloured power cable is also attached to the back of the instrument.
A substantial “Operation Manual” was acquired with the object.
Accession Number: 2018.rehab.10
Alternative Name: Impedance Audiometer AZ7
Primary Materials: Iron alloy, Plastic, Aluminum alloy.
A cue card placed on the top of the instrument reads: “BRIDGE// Leave on “audiometry” when not in use// Switch to “Compliance” for testing// Pump should be “up”// Turn dial slowly to +200 & see compliance// Reading on L side of machine – bring pump slowly towards 0 & see peak E Compliance reading on L – Subtract to get values”
The reverse side of the card reads: “Audiometry – Stimulus presented through headphone 226Hz none on the opposite side.”
An embossed label on the top surface reads “EMI// electro-medical instrument co. Oakville, Ontario.”
Two EMI calibration labels contain the following information:
“Dec/2/2010 // Recal Dec 2011” and “Pump Tube Nov/02/09 // Recal Nov 2010”
A sticker on the rear surface of the instrument reads: “Pump Tube Replaced Feb 96”
A sticker on the left side of the instrument reads: “The Queen Elizabeth Asset No. 20462”
A “Special Inspection Service” sticker from the Canadian Standards Association contains the following information “Model: A27″, Serial:5943”.
The “TELEX/ Telephonics” headphone includes the following numbers: “TDH-39P”, “60257”, “296D000-1”.
Dimensions (cm): Height = 12, Width = 34, Length = 26.
The impedance audiometer is a medical diagnostic instrument that tests hearing acuity. It measures the flexibility of the eardrum by generating variable pressure within the ear canal.
Very good: There are some dark marks on the top surface of the artifact, as well as minor scuffs and marks across its surface.
Date of Manufacture: Unknown
This artifact among a collection of items acquired from the Toronto Rehabilitation Institute on December 6th, 2017.
Chapter 9 of the Operation Manual lists a number of relevant sources about Impedance Audiometry.
- Donated to UTSIC