Hach-Lange SI794 P User Manual - Manual (Page 111)

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GainCheck Device self-test which runs automatically in
the background at fixed intervals. The
memory and signal transfer are checked.
You can also start the GainCheck manually.
Then, also a display test is performed and
the software version displayed.
Electrode zero
point
See Offset
Electrode slope Is indicated in % of the theoretical slope
(59.2 mV/pH at 25 °C). The electrode slope is
different for each electrode and changes
with age and wear.
Offset The voltage which a pH electrode provides
at a pH of 7. The offset is different for each
electrode and changes with age and wear.
One-point
calibration
Calibration with which only the offset (zero
point) is taken into account. The previous
slope value is maintained. Only one buffer
solution is required for a one-point
calibration.