Chapter Five: Operation
How To Calibrate the 670 Instrument
73
Relationship Between Averaging Entry and Calibration Times
Averaging Entry:
20
40
60
80
100
Null
17 sec.
24 sec.
32 sec.
40 sec.
49 sec.
F.S.
9 sec.
13 sec.
17 sec.
20 sec.
24 sec.
Zero
21 sec.
30 sec.
39 sec.
50 sec.
1 min.
Table 16: Relationship Between Averaging Entry and Calibration Times
Refer to Averaging, page 51, for more information.
6. Press the [
CAL
] key to enter the calibration menu.
7. Repeatedly press either arrow key ( [
] or [
] ) to scroll to the null screen.
NULL
-0.0001 Volts
Press ENTER to cal
8. Press the [
ENTER
] key to initiate the null calibration routine.
This step may take several minutes to complete, depending upon the averaging entry.
Refer to Table 16 for an approximate time. The message “
CALIBRATING
” will flash
on the display until the calibration procedure is complete. The reading should go to
0.000
±
0.0005. If the reading does not approach 0.000, press the [
ENTER
] key again to
repeat the null calibration routine.
9. Repeatedly press either arrow key ( [
] or [
] ) to scroll to the full scale screen.
FS:
9.99998 Volts
Press ENTER to cal
10. Press the [
ENTER
] key to initiate the full scale (FS) calibration routine.
The message “
CALIBRATING
” will flash on the display during the calibration process.
The reading should go to 10.000
±
0.0005. If the reading does not approach 10.000, press
the [
ENTER
] key again to repeat the F.S. calibration routine.
11. Pump down the system to a pressure less than the resolution of the pressure transducer.
To achieve a proper zero, the pressure of the system must be less than the resolution of
the pressure transducer used to measure the system pressure. The transducer will not be
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