Service manual

Neurodiagnostic Instruments Service Manual
2 - 24 Revision 2/18/05
AS-1 Auditory Stimulator
The AS-1 Auditory Stimulator provides a click or a tone
stimulus. The system user controls the click rate,
duration, intensity level and polarity.
The variable tone parameters are frequency and
envelope shape. The envelope variables are rise/fall
time and plateau time.
The auditory stimulator module is basically a digital to
analog converter with analog attenuation. The auditory
stimulator board converts a digital audio stream into a
left and a right analog audio output. Each analog
channel is capable of 140dB SPL output level. The
analog signal can be attenuated, with hardware, to a
maximum attenuation level of -140dB in 1dB steps. All
clicks, tone bursts, noise, signal mixing and continuous
tones are generated in the auditory Digital Signal
Processor (DSP) located within the SC-1 Stimulus
Controller module.
The AS-1 has a left and a right output jack for a 300
ohm transducers such as TDH-39 headphones, TIP-300
tubal inserts, or bone vibrator.
IES-2 Clinical Electrical Stimulator
The IES-2 is a single module with two independent
channels of isolated electrical stimulation. Each channel
has a seven pin DIN connector to accommodate an S403
Stimulus Probe and a pair of DIN 42 802 electrode
outputs.
IES-16 O.R. Electrical Stimulator
The IES-16 is a single module with two independent
channels of isolated electrical stimulation. Each
independent channel has eight DIN 42 802 electrode
pair outputs. Only one electrode pair, from each
channel, is active at a time. The system software
controls which output pair is active. There are no
connectors for the S403 Stimulus Probe.
AS-1 Auditory Stimulator
IES-2 Clinical Electrical Stimulator
IES-16 O.R. Electrical Stimulator