| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas chromatograph equipped with a heat conductivity type detector capable of adjusting the zero point of output without changing the current state in a cell. SOLUTION: A first differential amplifier 11 outputs a voltage (vin) equal to the differential output of a bridge and a second differential amplifier 12 outputs a voltage (vout) having magnitude which is obtained by magnifying the difference between the voltage (vin) and the offset voltage (voff) outputted from a D/A converter 13 by a gain G. A control unit 15 monitors the output voltage (vout) of the second differential amplifier 12 and sends the signal altering the value of the voltage (voff) to the D/A converter 13 when the voltage (vout) is judged to be out of the input range of an A/D converter 14.
|
