How To Calibrate the 670 Instrument
Chapter Five: Operation
74
zeroed if the output of the transducer is greater than 2% of the sensor full scale range.
Refer to the pressure transducer instruction manual for the proper pressure for your
transducer. It may take several hours to achieve an acceptable base pressure.
12. Press the [
ZERO
] key.
13. Use the Adjust knob to set the zero enable entry to ON.
Ch 1
2.14E-3 Torr
Zero Enable: ON
14. Press the down arrow key ( [
] ) to scroll to the zero screen.
Ch 1
2.14E-3 Torr
Press ENTER to zero
This screen will not appear if the zero enable entry is set to OFF.
15. Press the [
ENTER
] key to initiate the zero procedure.
The message “
CALIBRATING
” will flash on the display until the calibration procedure
is complete. The system responds by zeroing the pressure transducer.
If the 670 instrument is unable to establish an acceptable zero, you may need to increase
the averaging entry. Repeat steps 4 and 5 and increase the averaging entry. Setting the
averaging entry higher than 20 may increase the accuracy of the calibration, however, the
calibration procedure will take longer to complete. You do not need to repeat the null
and F.S. calibrations if you change the averaging entry.
16. Press the [
ZERO
] key to return to the pressure display screen.
17. If you prefer to use another value for the averaging entry, press the [
SETUP
] key, use
the arrow keys to scroll to the averaging screen, and reset the averaging entry.
Additional Calibration for the Type 274 Multiplexer
To calibrate a 670 instrument connected to a 274 multiplexer, complete the procedure described
above and repeat steps 11 through 17 for each channel. This configures the zero setting for each
channel.
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