BUCHI ELS Detector C-650 - Manual (Page 29)

C-650 Operation Manual, Version B 5 Putting into operation 29
When the detector is powered up or if you change the temperature, the temperature may first
overshoot the setpoint slightly and then stabilize at the desired point. This initial overshoot is due
to the regulation of the device and normal.
NOTE
To maintain appropriate temperature control, when the lowest temperature is required, it should
be set at least 5°C above ambient. Temperature stabilization typical time is 30 minutes. Please,
note that the stabilization time for temperature close to the ambient temperature may be higher.
When you press the
button, the Gain field can be edited. The gain range is from 1 to 12,
each increment of one unit increases the gain by a factor of 2 (e.g. if you change the gain from
1 to 4, the gain is increased by a factor of 8) and the full range of the gain is 1 to 2048. After you
have validated the desired gain setting, press the
button again to display the Autozero Offset
screen (Fig 5.17).
Autozero offset screen
Output Signal Value
After AZ: 000 mV
Fig 5.17: Autozero offset screen
This screen is used to allow the signal to reach the desired value when performing an autozero
(by keyboard or external contact closure).
This function can be helpful when the user wishes to have a positive signal value instead of zero,
especially with some acquisition systems which have only positive signal acquisition capability.
This setting can be changed with the and buttons and validated by the button.
After you have set the desired autozero offset, press the button to display the Noise Filter/
Pressure Unit screen (Fig 5.18).