Thermo Scientific TVA2020, Инструкция по эксплуатации

Страница: 85 / 190

Calibration
Detector Counts
Thermo Fisher Scientific TVA2020 Instruction Manual 4-9
Cal accept mode:
Manual
1=Manual 2=Auto
The second line of the display shows what option is currently selected. If
“Manual” is chosen, the instrument will display the detector count during
calibration and prompt the user to decide when to accept the calibration
value. If “Auto” is chosen, the instrument will automatically determine the
value to be stored and when to do it.
This selection allows you to choose whether or not the TVA2020 will
automatically save an accepted calibration. Choosing this selection from the
CAL CONFIG MENU produces the following display:
Cal save mode:
Manual
1=Manual 2=Auto
The second line of the display shows what option is currently selected. If
“Manual” is chosen, after a calibration value has been accepted the
instrument will prompt the user to decide whether to save the calibration
value or repeat the calibration (1 = Yes or 2 = Again?). If “Auto” is chosen,
the instrument will automatically store the accepted calibration value
without prompting the user.
Detector counts are the raw, unscaled detector output values associated
with a gas measurement performed by the FID or the PID. Before a
detector reading is displayed or recorded, the detector signal is converted
from analog to digital. The result is a raw number, or A/D counts.
When a detector is calibrated, the detector counts for the zero gas and each
of the span gases are saved in memory. These detector counts are then used
as reference points for calculating the concentration values to be displayed
or stored.
When calibrating the TVA2020 in the “Manual” accept mode, the counts
from the last calibration (Zero or Span) are displayed before the calibration
process is initiated. Once the calibration process is initiated, the live
detector counts are then displayed. You can refer to these counts as an
Cal Save Mode
Detector Counts