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37 Model 7500 Instruction Manual
Teledyne Analytical Instruments
5. In the “Calibration Selection” screen that appears, select “Both” or “Current” by pressing the UP or
DOWN key.
• When selecting “both”, Range 1 and Range 2 of the set CH
are calibrated together.
• When selecting “Current”, the range alone displayed at the
set CH is calibrated.
To close “Setting of Calibration Range”
To close “Setting of Calibration Range” or to cancel this mode
midway, press the ESC key. A previous screen will return.
EXAMPLE:
CH1
CO2
Range 1: 0 to 10 vol%
Range 2: 0 to 20 vol%
both
CH2
CO
Range 1: 0 to 500 ppm
Range 2: 0 to 2000 ppm
current
CH1: Range 1 and Range 2 are calibrated together, with zero or span calibration.
CH2: Only currently displayed range is calibrated, with zero or span calibration.
Manual Calibration screen
In case of “both” setting
Two cursors will appear in both ranges.
Note: When calibration is performed by the “Both” setting under the normal operating condition, prepare a
span gas cylinder on the normal operating range side. It is recommend to perform span gas calibration in
the normal operating range. The other range that is calibrated by “Both” may result in some error (max. of
±5% of FS).