Hanna Instruments HI 23 - Manual (Page 20)

39 38
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
• Press CFM to confirm the selected parameter that will stop
blinking on the primary display. The secondary display shows
the HI 931002 or multimeter input value as lower limit of
the interval.
• Use the or to make the HI
931002 or multimeter output cor-
respond to the meter’s value
shown on the secondary display
(e.g. 4).
• Wait for approximately 30 seconds (until the reading of the
calibrator is stable).
• Press CFM to confirm. The meter will switch to the second
calibration point. Repeat the above procedure.
• After the desired readings are obtained, press CFM and
the meter will skip back to normal operational mode.
• Press CFM to confirm. The meter will return to normal op-
erational mode.
Calibration procedure may be interrupted by pressing CAL
again at any time. If the calibration procedure is stopped
this way, or if the controller is switched off before the last
step, no calibration data is stored in nonvolatile memory (EE-
PROM).
ANALOG OUTPUT CALIBRATION
In the models where the analog output is available, this fea-
ture is factory calibrated through software. The user may also
perform these calibration procedures.
Note It is recommended to perform the output calibration at least
once a year. Calibration should only be performed after 10
minutes from power up.
• With a multimeter or an HI 931002
connect the common port to the
ground output and the second port to
the current output or voltage output
(depending on which parameter is be-
ing calibrated).
• Press and hold in sequence CFM first, then and then
• Execute the password procedure.
• The primary display will show the selected parameter blink-
ing. Use the to select the code (0-5 see chart below) for
the desired parameter displayed on the secondary display
(e.g. 4-20 mA).