|Note: This page was at http://members.aol.com/noshock/machines/machtest3.htm and the site has disappeared. Thanks to the wonders of the Wayback Machine, I was able to get a copy of this page. If the person who owns this sees this, and will contact me with a new URL, I would be happy to redirect people to the new address, if you have one. I just didn't want to see this page gone from the net.....Juli|
|a small electric current is passed through the brain|
|the voltages used are no higher than 150 volts|
|ECTRON Series 5A||UK||225 volts||0.75 Amps||700 mC|
|MECTA SR2||UK||240 volts||0.8 Amps||1200 mC|
|MECTA SR2||USA||240 volts||0.8 Amps||576 mC|
|MECTA SR2||EUROPE||240 volts||0.8 Amps||403.2 mC|
|THYMATRON DGx||UK||450 volts||0.9 Amps||1008 mC|
|THYMATRON DGx||USA||450 volts||0.9 Amps||504 mC|
|THYMATRON DGx||EUROPE||450 volts||0.9 Amps||504 mC|
|Electrical Quantity (Charge)
The Electrical Quantity (or Charge) is defined as the amount of electricity passing through a given point in a given time. The SI symbol for Electrical Quantity is "Q" and it is measured in Coulombs or milliCoulombs (thousandths of a Coulomb) and is usually abreviated to 'mC' as in the Table above.
For example, the UK version of the Somatics Thymatron (see above) will deliver a Charge of 1008 milliCoulombs in 5.3 seconds. Looked at another way, 1008 milliCoulombs of Electricity will pass through a given point (the patient's brain) in a given time (5.3 seconds).
The Threshold Value is the Electrical Quantity (Charge) required to produce a convulsion in a particular patient. Since we are all different, it takes different amounts of electricity to cause a convulsion in each of us (i.e. our Threshold Values are different). The Threshold Value for one person could be as low as 25 millicoulombs whereas the Threshold Value for the next person could be more than 1000 millicoulombs (i.e. it can take more than 40 times as much electricity to cause a convulsion in one person as the next).
Current is the rate of flow of electricity. It is the amount of electricity Electrical Quantity or Charge which passes a given point in a second. Since Electrical Quantity is measured in Coulombs (or milliCoulombs) the obvious measurement for Current is Coulombs/second or milliCoulombs/second. However, Current has been given its own special unit; it is measured in "amps". One amp is equivalent to 1 Coulomb/second. The SI symbol for Current is "I".
Resistance is that which opposes the flow of electricity. Resistance tries to reduce the current. The higher the resistance, the lower the current. The SI symbol for Resistance is "R" and it is measured in ohms.
Voltage can be defined as that which causes electricity to flow. It is an electrical force. Increasing the Voltage will cause the Quantity of Electricity to increase so that more electricity will be passing through a given point each second which means that the Current is increased (i.e. The higher the voltage, the higher the current). The SI symbol for voltage is "V" and it is measured in volts.
|Voltage(V) = Current(I) x Resistance(R)|
|Charge(Q) = Current(I) x Time(t)|
|Max Output Voltage (V)||450 volts|
|Output Current (I)||0.9 amps|
|Pulse Width||1.5ms (0.0015 seconds)|
|Stimulus Duration||0.26-5.3 seconds|
|OutPut Charge||50.4-1008 mC|
|Stimulus Intensity (max)||191 mC/sec|
|Earlier, it was mentioned that Electrical Quantity (Charge), Current and Time were connected by the formula below:|
|Charge(Q) = Current(I) x Time(t)|
|The maximum Charge that the Thymatron can deliver is 1008 mC. From the formula it can be seen that this is the current multiplied by the time for which the current flows The current flowing through the brain of the patient is the Charge (1008 mC) divided by the Time (1113 milliseconds) during which the current is flowing. This works out at 0.9056 amps which, if rounded down to one decimal place, works out at 0.9 amps. This is exactly as stated in the specification.|
|Energy (E) = Voltage (V) x Current (I) x Time (seconds)|