Hanna Instruments PCA 300 Series - Manual (Page 33)

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voltage limits can be calibrated automatically as follows:
1.A To automatically calibrate "ZERO" scale
1.A.1 Press DIAG. The display will show the last diagnostic
mode and the right-most numerical digit will blink.
Note If the analyzer has been reset or turned on, “d000” will ap-
pear when pressing DIAG.
1.A.2 Enter code 104 using the and keys.
1.A.3 Press DIAG; “rc 0” will be displayed and the analyzer
will execute this mode.
1.B To automatically calibrate "FULL" scale
1.B.1 Press DIAG. The display will show the last diagnostic
mode and the right-most numerical digit will blink.
1.B.2 Enter code 105 using the and keys.
DIAG
DIAG
DIAG