Using the Temperature Sensor/Heater circuit for the PICNIC camera. For now, please contact Marc Lacasse before using this equipment. The Circuit and cables are on the bottom shelf of the left black cabinet . There is also a PICNIC readout cable there which is not needed. There are 3 parts Bendix 10 to DB9M & dual inline connector with 6 positions but 4 wires. DB9 M&F ribbon cable to Single inline connector with 3 positions & wires. NICMOS3 T-Sensor Board Circuit. .Schematic. .Photo of board. .Photo of three parts The Bendix 10 pin connects to the bottom of the Dewar. The Dual inline connects to the center header on the NICMOS3 T-Sensor board. (I have not changed the labels yet - the labels are appropriate for the NICMOS3 and not the PICNIC. The cable can be used to sense temperature with either but an adapter will be needed to heat the NICMOS3.) The DB9 Male on the ribbon cable connects to the PICNIC Power supply (not the small card cage). If detector is used, the DB9 Female connector powers the small card cage. The inline connector is to the 3 pin header on the T-Sensor board. Hook up a voltmeter to the GND point and to the Temp Test Point. A reading of 1.0 volt indicates a temperature of 77K, a reading of 0.5 volt indicates room temperature. Heating feature There is a 10 ohm resistor in the chip carrier which acts as a current limiting resistor. There is a net 250 ohm resistor network between +15V and one end to the resistor. The other end of the resistor is connected to the 130 ohm heating resistor near the PICNIC chip in the Dewar. If you remove this resistor there will be no heating. You can put a larger resistor in to get a smaller amount of heat introduced. Carrier R Current Chip Power 10 0.038 0.192 100 0.031 0.127 220 0.026 0.081 330 0.021 0.058 560 0.016 0.033 1000 0.011 0.015 2200 0.006 0.004 Here is the cable pinout in case it is needed Bendix DB9 dualinline A 2 B 1 C 5 & 9 D gray E black F brown G white H 3 J 6 K 7 dualinline gray x black white x brown Marc Lacasse 1/14/2005 rev 2/1/2005