Hanna Instruments PCA 300 Series - Manual (Page 37)

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DIAG
3.A.4 The reading on multimeter will slowly in-
crease. When the desired value is
reached, press DIAG again to store it
and quit the mode.
3.B If the recorder zero reads too high
3.B.1 Press DIAG. The display will show the last diagnostic
mode and the right-most numerical digit will blink.
3.B.2 Enter code 101 using the and keys. After code is
selected display will show “d101”.
3.B.3 Press DIAG; “r dn” will be displayed and the analyzer
will execute this mode fine tuning the low value.
3.B.4 The reading on multimeter will slowly de-
crease. When the desired value is
reached, press DIAG again to store it
and quit the mode.
DIAG
DIAG
DIAG
DIAG