AUTOMATIC ZERO FUNCTION
The meter provides two methods to zero the probe. The first is completely automatic. Prepare the probe for zeroing, then start the automatic
zeroing. The screen will say “Processing” while the meter zeros, and afterwards the meter will display approximately zero as the current
reading. If the reading before zeroing the probe exceeds ±30 mT (300 G or 23.88 kA/m) when the probe is in a zero chamber or very low field,
then the probe may be defective. The meter will switch over to the DC mode of operation during zeroing. Recall that the zeroing operation
affects DC offsets only. If you wish to suppress an AC field reading, consider using the RELATIVE mode.
Once automatic zeroing begins it must be allowed to complete. During this time all controls are disabled except for the POWER switch. The
process normally takes from 5 to 15 seconds. If the sound is enabled, the meter will have an audible beep when automatic zeroing begins.
The meter selects the lowest range and adjusts the nulling signal until the net result reaches zero. At this point the automatic process is
terminated and the “Processing” text will disappear.
If the nulling process is successful, the next highest range is selected. No further electronic adjustments are made, but at this stage a reading
is acquired which will be mathematically subtracted from all future readings on this range. This process is then repeated for the highest range.
When finished, the meter will sound an audible beep (if audio is enabled) and the “Processing” text will disappear. At this point the automatic
process can be repeated or a manual adjustment can be performed (see “Manual Zeroing”).
The final zero values will remain in effect until the meter and probe are zeroed again.
NOTE:
Zeroing the probe cancels the RELATIVE mode if it was turned on.
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