39
38
LAST CALIBRATION DATA
The meter stores the following information about last calibration in
the EEPROM:
• Date
• Time
• Offset in mV (for pH 500 only)
• Up to two slopes (for pH 500 only)
• Up to three buffers
While displaying this data, the pH controller remains in con-
trol mode.
The procedure below indicates the flow for a three-point cali-
bration. The sequence will vary if fewer calibration points are
used (e.g. for a one-point calibration the following data will
be displayed: date, time, offset, first slope, buffer 1 value).
For the mV 600, last calibration data includes date and time
of calibration and the values of the 2 calibration points. Dis-
playing of these items follows the above sequence.
• To begin the cycle press CAL DATA. The last calibration
date will appear on the main LCD display as DD.MM
format, while the secondary display will show the year.
If the meter has never calibrated or an EEPROM reset has
occurred, no calibration data is shown when CAL DATA is
pressed. The “no CAL” message will blink for a few sec-
onds, then the meter skips back to normal mode.
• Pressing will cycle through the fol-
lowing steps in reverse order, i.e. last
buffer.
OUTPUT
CALIBRATION
CALIBRATION
CALIBRATION
TYPE
CODE
POINT 1
POINT 2
0-1 mA
0
0 mA
1 mA
0-20 mA
1
0 mA
20 mA
4-20 mA
2
4 mA
20 mA
0-5 Vdc
3
0 Vdc
5 Vdc
1-5 Vdc
4
1 Vdc
5 Vdc
0-10 Vdc
5
0 Vdc
10 Vdc
