User Guide

43
mV INPUT CALIBRATION
The pH/mV controller is factory calibrated for the mV and
temperature inputs. However, the user may also perform a
mV calibration.
• Short the Connection for Potential Matching Pin (#9 on
page 7) and the Connection for the Electrode Reference
(#8 on page 7) with a jumper wire.
• Attach a HI 931001 (pH 502) or HI 8427 (mV 602) simu-
lator to the BNC socket.
• Press and hold first CFM and then
CAL to enter the mV Input Cali-
bration mode.
• Execute the password procedure.
• With pH 502, the meter will ask for the calibration proce-
dure code number. The following table lists the possible
values of the input code and calibration points:
INPUT CODE POINTS CAL.VALUES INPUT RANGE
mV 0 2 0 & 350 or 0 & 1900* ±2000,
Temp. 1 2 0 & 25 or 0 & 50 -9.9 to 120.0
°
C
* One of the points must be 0. 1900 mV calibration point is available
on mV 602 models only.
When calibrating the mV of mV 602 models, enter the
calibration mode by pressing CAL and confirming the pass-
word (as for pH calibration of pH 502). No code selection
is required.
• Use  or  to select code 0 for mV calibration and press
CFM to enter.
• CAL will blink on the LCD until the
meter confirms a steady reading.