7.1.7 Set Meas. Val. to Zero, Zero Pt Corr., Sensor Adjustmt
Setting Measured Value to Zero
The user can zero the measured value at certain locations or at certain times in
order to check the deviation from this reference value. The indicated measured
value is, by the following key combination, stored as base value and, as a
result, set to zero.
Function: MEAS.VAL. with key Zero setting: ,
M/HOLD
1s
PROGR
CLEAR
Please note that this function is only available if the locking code is
set below 5 (see 6.7).
If function ´BA´ is activated the new base value will be stored in the
EEPROM of the connector (see 6.6). If not activated, the original
value will be inserted again after switching off and on.
The arrow CORR. appears in the display as long as the deviation
from the base value is indicated, but not the actual measured value.
To return to the original value again, the base value must be cleared. If function
´BA´ is not activated a switch-off of the instrument is sufficient (see above).
However, if the function ´BA´ is activated, it can be selected with the key F2 and
the base value can be cleared with the keys lo
ng, CLEAR.
▲
PROGR
Function: BASE ´BA´ with key .. Clear base: ,
F2
1s
PROGR
CLEAR
Zero Point Adjustment
Many sensors must be adjusted at least once or at regular intervals to
compensate for instabilities. For this purpose and in addition to the ´Set
Measured Value to Zero´ mentioned above, a specific zero point adjustment
is available, which has no effect to a scaling with base and factor (e.g. pH
probes). In this function the zero point error is not stored as base value but as
zero point correction. The zero point correction is performed with the following
keys:
Function: MEAS.VALUE Zero point adjustment: ,
M/HOLD
1s
PROGR
+/-
The function zero point adjustment is only available if the function
zero point correction has been activated (see 5.2) and if the locking
mode has been set to a lower level than 4 (see 6.7).
If a base value is programmed the measured value is not indicated
as zero but as the negative base value after the adjustment.
34 ALMEMO
2290-4
Continuous Measurement of a Measuring Point
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