Hanna Instruments PCA 300 Series - Manual (Page 38)

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DIAG
3.C If the recorder full scale (upper limit) reads too
low
3.C.1 Press DIAG. The display will show the last diagnostic
mode and the right-most numerical digit will blink.
3.C.2 Enter code 102 using the and keys.
3.C.3 Press DIAG; “r up” will be displayed and the analyzer
will execute this mode fine tuning upper value.
3.C.4 The reading on multimeter will slowly
increase. When the desired value is
reached, press DIAG again to store it
and quit the mode.
3.D If the recorder full scale (upper limit) reads too
high
3.D.1 Press DIAG. The display will show the last diagnostic
mode and the right-most numerical digit will blink.
DIAG
DIAG
DIAG