Compaq MTEK6000 - Manual (Page 36)

MTEK6000 SERIES USER'S MANUAL
3-10 January 2002
CALIBRATION MODE
Calibration mode allows the user to calibrate
any of the analog signals, such as the
pressure transducer or the temperature
probe. While operating in the calibration
mode, the MTEK6000 continues to store
pulses and periodically updates volume,
pressure, and temperature data using the
values measured when calibration mode was
initially entered. Once in calibration mode,
the user can perform the following
operations:
1. Calibrate zero only.
2. Calibrate span only.
3. Calibrate both zero and span.
Of course, the option to change the
calibration reference points is available at all
times. Several other features make the
software calibration routine attractive and
more intuitive. In the MTEK6000, unit
calibration is software-based; there is no
need for laborious operator adjustments.
Software calibration does away with the
need for repetitive potentiometer
adjustments, thereby simplifying field
calibration procedures.
In order to perform calibration, you will
need a pressure source, temperature source,
and accurate reference indicators. You will
also need the Metretek, Inc. Virtual keypad
or the optional external keypad and display.
Calibrating the Pressure Transducer
NOTE
Pressing esc repeatedly from anywhere
within the calibration procedure will back
the operator out of calibration mode.
1. Display the line pressure by pressing F3
or jumping to 030302.
2. Press cal. Enter your password at the
optional PASSWORD? prompt, if
required.
3. The unit will enter calibration mode.
The display will alternate between
CALIBRATING and the parameter label
(Pressure for example).
4. Close the shut-off valve between the
pressure source and the pressure
transducer.
5. Open the pressure sensing line on the
unit to the atmosphere, and wait until the
line is fully vented and the reading is
stable.
6. Press zero. The display now shows:
ZERO> XX.XXX
NEW?>
XX.XXX represents the unit's default zero
value. If the current zero reference matches
the unit's default, simply press ent to collect
the new point. Otherwise, key in the value
of the current reference before pressing ent.
The unit should display Calculating . . .
briefly, and then display the new point.
Pressing esc instead of ent at this point
aborts the operation and returns you to the
calibration prompt.
7. Apply the span (full scale) reference to
the pressure sensor and wait for the
reading to stabilize
8. Press span. The unit now shows:
SPAN> XX.XXX
NEW?>