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MP Research System | Contact Microphones | Page 1 - 1 Updated: 3.21.2013
TSD108 AND SS17L PHYSIOLOGICAL SOUNDS TRANSDUCER (CONTACT MICROPHONE)
The physiological sounds transducer connects to the DA100C amplifier (TSD108) or the MP3x/4x hardware
(SS17L). The transducer can be used with the Noninvasive Blood Pressure Cuff or as a stand-alone device. If
used with the cuff, Korotkoff sounds can be recorded for easy determination of systolic and diastolic blood
pressure. When used on its own, it can record a variety of acoustical signals, including heart sounds and sounds
associated with rubbing or grinding (e.g., Bruxism). The acoustical transducer element is a Piezo-electric ceramic
disk that is bonded to the interior of a circular metallic housing.
Grounding Note When using this transducer with the EBI100C module, do not connect the GROUND pin of
the TSD108 to the DA100C module. Doing so will cause inaccurate impedance measures,
because the TSD108 contact surface is tied to the isolated ground. An alternative is to
insulate the TSD108 from the skin surface by using a latex balloon or some other non-
conductive barrier. If the latter procedure is followed, the GROUND pin may be attached to
the DA100 module.
TSD108: Korotkoff signal is recorded by a DA100C
amplifier set to AC, 5000 Hz LP and a gain of 50 to 200.
SS17L: To record the Korotkoff signal, select SS17L
preset from MP3x/MP4x > Set Up Channels menu.
The signal for the physiological sounds transducer is usually
further conditioned by the software. In a calculation channel, the
signal can be bandpass filtered fro
m 50 to 200 Hz. The sampling
rate for the entire recording needs to be about 500 Hz, assuming
the physiological sounds transducer is used.
TSD108/SS17L SPECIFICATIONS
Frequency Response: 35 Hz to 3500 Hz
Housing: Stainless Steel
Sterilizable: Yes (contact BIOPAC for details)
Noise: 5µV rms – (500 Hz - 3500 Hz)
Output: 2V (p-p) maximum
Weight: 9 g
Dimensions: 29 mm diameter, 6 mm thick
Cable Length: 3 m
Interface: DA100C (TSD108), MP3x (SS17L)
Calibration: None required
TEL100C Compatibility: SS17
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