SOMATICS, LLC
REV: 3.1 09/15/2015
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collect 5 seconds of data then stop the collection by pressing the START/STOP button
again. Note that the paper graph should have 4 traces of 10 Hz signal approximately 1 CM
in size each. The main display should show "#1--xx.x”, the value must be between 80.0
and 120.0. If it is, press the Flexdial button to calibrate, the display should show 100.0.
Turn the Flexdial clockwise one click and the display should show "#2--xx.x". Repeat
procedure for channels 2-4. If any channel is not in the range of 80-120 there is a fault that
must be diagnosed and repaired before proceeding. If a calibration is attempted with out of
range results the system will display "error" and will not recalibrate.
All the calibration values are stores in the battery backed memory and will remain there
even with the power switched off. Press the START/STOP button to exit the EEG
channels calibration and return to the main shell. The display will read CALIBR.
5.4
IMPEDANCE GAIN CALIBRATION
Connect 1500 ohm 1 % load across the treatment leads. This load can be rated at low
wattage, 1/4 or 1/2 watt but be very careful not to press the TREAT button while using
this load.
CAUTION: The low wattage load will be destroyed and possibly catch on fire if a
treatment is initiated.
Press the IMPEDANCE button and hold until a value is displayed. Make sure the reading
is between 1350 and 1650 ohms. If it is, press the Flexdial button to calibrate, the display
should show 1500. Press the START/STOP button to exit the impedance calibration and
return to the main shell. The display will read CALIBR.
5.5
CURRENT AND VOLTAGE MEASUREMENT ADJUSTMENT.
NOTE: Make sure that the output current is calibrated first as described below.
Connect 200 ohms 10 W resistor to the ECT stimulus cable, see fig 3.1. Set PERCENT
ENERGY dial to 100% and push TREAT button. Hold the button until the indicator light
goes off. The main display should show ".xxA xxxV”, the values must be between
0.72-1.15A and 144-198V. If they are, press the Flexdial button to calibrate, the display
should show "0.90A 180V" Press the START/STOP button to exit the impedance
calibration and return to the main shell. The display will read CALIBR.
5.6
OUTPUT CURRENT ADJUSTMENT
Connect 200 _ Dummy load across the output and follow steps 3.1-3.3. If peak output is
not 180 volts ± 7.5% peak, adjust VR301 for proper output. See fig. 5.2
5.7
POWER SUPPLY VOLTAGE ADJUSTMENT
Connect DMM probes between the case of LM338 +5V regulator and ground on the
power board. Adjust VR302 to 5.0 Volts. Repeat for +24 V but adjust VR303. See fig.
5.2
