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Instrument Zeroing
The Jerome
®
431-X has three ways to zero the sensor reading before samples are taken if the
Option Functionality is installed:
(1) The instrument automatically re-zeroes between samples so that each sample is a unique
reading. To take a sample, simply press the SAMPLE button.
(2) The manually adjusted zero, using the switch on the top of the 431-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.
(3) The 431-X Option Functionality provides an auto-zero feature following regeneration that is
invisible to the user.
•
In some cases, the instrument cannot resume sampling after regeneration. .L.L.L appears
on the display when the ZERO button is pressed and the error message “manual bridge
adjust needed” is added to the notes column of the JCS text file when the JCS is used. If
this problem persists, it may be necessary to re-set the auto-zero.
•
When necessary to re-adjust the auto-zero point:
Ensure the instrument has been regenerated and 30 minutes have passed since the
regeneration completed before proceeding.
Turn the instrument off.
Make a note of the original DIP switch settings of SW100 on the Option Circuit
Board (Non-SMV units) or on the Main Circuit Board (SMV units).
On the Main Circuit Board DIP switch SW2, turn DIP switch 4 to ON.
Set the DIP switch SW100 to 1,2,6 OFF; 3,4,5 ON.
Turn the instrument ON.
Press and hold the ZERO button and adjust the potentiometer on top of the instrument
until the number 20 is displayed, then release the ZERO button.
Non-SMV units only
:
Switch SW100 DIP #1 from OFF to ON three times leaving it set to ON. (i.e.
starting from OFF, switch it ON, OFF, ON, OFF, ON).
Press and hold the ZERO button while turning the potentiometer on the option
board until the number 20 is displayed. Note the display may flicker one digit.
All units:
Return all switches to their original position.
NOTE:
The higher the auto-zero number, the lower the sensor capacity and the more sensor
regenerations are needed.
