How To Calibrate the 670 Instrument Cha
ter Five: O
eration
72
How To Calibrate the 670 Instrument
The 670 instrument displays the message “
CALIBRATING
” during any calibration procedure.
Note
Complete the calibration procedure in the order listed below. Failure to
do so may result in an invalid calibration.
To calibrate the 670 instrument:
1. Press the [
SETUP
] key to enter the setup menu.
The system responds by displaying a setup screen.
2. Repeatedly press either arrow key ( [
] or
[ ] ) to scroll to the response screen.
The system responds by scrolling through the setup screens.
3. Use the Adjust knob to set the response entry to 400 milliseconds. Refer to
Response
,
page 46, for a complete description of this entry.
Ch 1 760 Torr
Response: 400 mSec.
4. Repeatedly press the down arrow key ( [ ] ) to scroll to the averaging screen.
Ch 1 760 Torr
Averaging:20
5. Use the Adjust knob to set the averaging entry to 20.
An averaging entry of 20 is sufficient for the null and full scale calibration procedures.
You may need to increase the averaging entry to establish a valid zero. Increasing the
averaging entry and the response time will improve the accuracy, however, the
instrument response will be slower and the calibration will take longer to complete.
Table 16, page 73, lists the approximate time for each calibration function with various
averaging entries.
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