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14. APPENDIX D - JEROME 631-X OPTION BOARD
Proper use of this board requires that the base instrument be fully functional and set correctly for
the intended operation.
Auto-Zero
With the option board installed, the 631-X has a limited auto-zero function. This function cannot
be disabled and is transparent to the user. The instrument can be manually zeroed as described in
“Zero Adjust” on page 13. However, if the instrument is to be operated by personnel not familiar
with the procedure or if it is operated unattended, the auto-zero function should satisfactorily zero
the unit after each sensor regeneration.
Instrument Zeroing
The Jerome 631-X has essentially three ways to zero the sensor reading before samples are taken
if the option board is installed.
• The instrument automatically re-zeroes between samples so that each sample is a unique
reading. To take a sample, simply press the SAMPLE button.
• The manually adjusted zero, using the switch on the top of the 631-X is used to re-establish
a baseline between the reference and sensor gold films only after a sensor regeneration.
This zero is manually adjusted by pressing the ZERO button and turning the potentiometer
on the top of the instrument until the display reads 0. Adjust only after sensor
regeneration; it is normal for H to be displayed after sampling.
• The 631-X option board provides an auto-zero feature following regeneration that is
invisible to the user.
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