PC ISA bus Thermode (the original)

General Information: (html file)

Specifications (GIF image)

Tip Construction (GIF image)

Prospect XXI (RTF file)

Schematics:

USB  upgrade #1 (March, 2006)  

Software
The parameters are identical to the one used for the Medoc TSA thermode and the DNIC thumb stimulator softwares. A detailed description can be found at:  Parameter Table Help in HTML form (With "Sounds" and Magnitude Estimation device "Messages" Options).
Main Window (parameter table window  and associated graph).
Windup parameter table and resulting graph.
Marstock parameter table(first 5 columns), parameter file, resulting graph and Saved data displayed in Excel.
Thermode Controller Front Panel (can be displayed through the  "View Panel" button inside the Thermode Status frame):
         #1  When first powering on the system, the "Coolant too warm" indicator is normally on.  The thermode will not function until this indicator goes off (≈30 to 60 minutes).
         #2  When the coolant reaches temperatures below the set minimum for the thermode, the "Temperature Low" indicator comes on and will not reset until the coolant is cold enough for normal operation allowing the thermode heater power supply to turn on.
        #3.  Once the coolant has reached normal operating temperature, the error indicators should go off and the ready indicator should come on. The thermode now can be used.

Calibration Window.
Options Window.

Hardware
General  LabJack U12 USB DAC system is used to interface the thermode controller to the PC USB port.
The LabJack U12 DtoA only supplies 0 to 5 vdc with only the accuracy of the PC supply. A feedback is necessary to adjust the command in order to compensate for power supply fluctuations.
The range is from 20C at 0.5vdc to 60C at 4.5 vdc.
Conversion formulas:
Voltage = Temperature / 10 - 1.5
Temperature  =  Voltage x 10  + 15
Schematics Thermode Amplifier

        Calibration

Hardware Calibration.
Use UNC-Thermode.exe 2 step calibration table: 20 & 50C 
At 20C adjust  the Command Offset potentiometer ("TEMP - OFFSET - Command", above the "Computer" 25 pin D shell connector) on the thermode controller back panel until the "Command In" = "Command Out" in the main window "Thermode Status" frame.
At 50C adjust the Command Range potentiometer ("TEMP - RANGE - Command", above the  "Computer" 25 pin D shell connector) until the "Command In" = "Command Out".

USB  upgrade #2 for UNC and Yale Thermodes (August, 2006) 

        Software
The software is almost identical to the one used for the upgrade #1 above:

The parameters are identical to the one used for the Medoc TSA thermode and the DNIC thumb stimulator softwares. A detailed description can be found at:  Parameter Table Help in HTML form (With "Sounds" and Magnitude Estimation device "Messages" Options).
Main Window (parameter table window  and associated graph).
Windup parameter table and resulting graph.
Marstock parameter table resulting graph.
Thermode Controller Front Panel (can be displayed through the  "View Panel" button inside the Thermode Status frame):
         #1  When first powering on the system, the "Coolant too warm" indicator is normally on.  The thermode will not function until this indicator goes off (≈30 to 60 minutes).
         #2  When the coolant reaches temperatures below the set minimum for the thermode, the "Temperature Low" indicator comes on and will not reset until the coolant is cold enough for normal operation allowing the thermode heater power supply to turn on.
        #3.  Once the coolant has reached normal operating temperature, the error indicators should go off and the ready indicator should come on. The thermode now can be used.

Calibration Window.
Options Window.

Graph Option  (HTML file)
Magnitude Estimation Device  (HTML file)
Marstock

        Hardware
General 
The USB DAQ used is the same as the one used for upgrade #1, but both Digital to Analog outputs are used for the temperature command, thus doubling the range.
Both, the UNC and Yale thermodes use a scale of 100 mv / C . The two LabJack U12 Digital to Analog  outputs have a 0 to 5 volt range each, giving a total range of 10 volts, or 100 C (-20C to 80C).
The Yale thermode has no offset: 0 volt representing 0C. On the other hand, the UNC thermode has a 4 volt offset (-4 volt represents 0C).  The UNC thermode was designed with an easy 2 point calibration in mind, maximizing its accuracy from 40 to 50C.For this reason, 40C was chosen for 0 volt, where the offset is adjusted and 50C was chosen as the point where the range is adjusted.

Schematics  
Thermode Amplifier
Interface Circuit.
Enclosure
Circuit Board layout.

      Calibration
Hardware Calibration.
Use UNC-Thermode.exe 2 step calibration table: 20 & 50C  change the 20 to 40 in the first column.
At 40C adjust  the Command Offset potentiometer ("TEMP - OFFSET - Command", above the "Computer" 25 pin D shell connector) on the thermode controller back panel until the "Command In" = "Command Out" in the main window "Thermode Status" frame.
At 50C adjust the Command Range potentiometer ("TEMP - RANGE - Command", above the  "Computer" 25 pin D shell connector) until the "Command In" = "Command Out".

2001 January 8
Last upgrade 2008 October 20