Service manual

Neurodiagnostic Instruments Service Manual
5 - 8 Revision 2/18/05
EMG speaker
Temperature read
Impedance Limited reading (VikingSelect only)
The VikingQuest does not have an impedance limited
detection circuit.
VikingQuest/VikingSelect Application Checks
Perform one or more of the following tests. Include the
steps of generating and printing a report for one test.
Since the user interface, menu layout and installed
options will vary between the Viking systems, consult
your system operator or a system user’s guide for the
sequence of steps to follow.
 Auditory Evoked Potential
 Visual Evoked Potential
 Somatosensory Evoked Potential
 Motor Nerve Conduction
 Sensory Nerve Conduction
 SPA EMG (surface electrode only)
Step Action
1. Set the Audio volume control knob to 0
(fully counterclockwise).
2. Enter the EMG/SPA test and display the
waveform screen.
3. Set the SNS level to 100uV, to provide an
appropriate level of background noise.
4. On the Control Panel, turn the Audio
volume control knob clockwise slowly to
verify a linear increase in sound from the
EMG speaker.
Step Action
1. Enter the NCS/MNC test and display the
waveform screen.
2. Insert the temperature probe into its
connector. "Temp=XX" text appears at the
bottom right side of the waveform screen.
3. Note the temperature reading displayed.
4. Warm the probe between your fingers and
note the temperature reading. It should
increase.
Step Action
1. Enter the EP/SEP test and display the
waveform screen.
2. Set the following parameters:
Mode = Remote
Type = Current
Range = 10mA
3. Starting from 0%, turn the Stimulus
Intensity knob to increase the stimulus
intensity reading. With the probe tips open,
the system should display an IMEDANCE
LIMITED message at the upper left of the
waveform screen when the stimulus
intensity exceeds 1mA. The message should
disappear when you turn the intensity back
to 0%.
4. Place a 4k load across the probe tips, or
apply some conductive gel to the probe tips
and place them against your skin (thumb
muscle or wrist). Turn up the Stimulus
Intensity knob slowly to about 6 mA. The
system should not display the Impedance
Limited message while current is being
delivered.
5. Repeat steps 3 and 4 for each stimulator
channel in the both the Console and Remote
modes of operation.