Calibration And Factory Presets; Eeg Amplifier Gain Adjustment - Somatics THYMATRON System IV Service Manual

5.

CALIBRATION AND FACTORY PRESETS

5.1 All adjustments require removal of the top panel. To do this, make sure the machine
is off, remove the 2 screws from the back of the top panel and lift the top cover backwards
until it clears the case. Refer to figure 5.1 for location of jumpers and connectors
CAUTION: WITH CASE OFF, HIGH VOLTAGES ARE EXPOSED. EXERCISE
CAUTION TO AVOID INJURY.
5.2 With the system turned off install a jumper on J3 (test). Turn on the system and note that
the display shows CALIBR.
5.3

EEG AMPLIFIER GAIN ADJUSTMENT

Set oscillator to 2V p-p and 10Hz. Use a calibrated meter to adjust the oscillator to .707
Volts. (It may help to temporarily set the oscillator to 30 Hertz but remember to reset it
back down to 10 Hz when finished with adjusting of the volts). Connect all 4 channels to
the oscillator according to fig. 3.7. Press the START/STOP button and let the system
SOMATICS, LLC
fig 5.1
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REV: 3.1 09/15/2015