Setra System Model Datum 2000 - Manual (Page 14)

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CALIBRATING THE DATUM 2000™.
Note: If on power up, the Datum 2000™ display alternates between "cal"
and "no Yes", it has not been calibrated at the factory. If the Datum 2000™
(Channel 1 or 2) displays numbers on power up, one or both channels have
been calibrated at the factory.
Always allow the DATUM 2000™ and the transducers, transmitters, or
reference voltage supplies to warm-up 10 minutes before performing a
calibration.
Whenever possible, it is best to calibrate the DATUM 2000™ at the tempera-
ture expected during operation.
There are 3 ways to calibrate the DATUM 2000™: Applying pressure to a
transducer or transmitter connected to the DATUM 2000™; applying voltage
to simulate the transducer, or current for a transmitter, directly to the DATUM
2000™; or using the DATUM 2000™’s internal reference voltage. The way
you should calibrate your meter depends on the equipment you have avail-
able. If you can apply very accurate and stable pressures, use this method.
If you have a precision voltage source, use it to simulate the transducer’s
output. If you have a precision current source, use it to simulate the
transmitter’s output. If you cannot calibrate your DATUM 2000™ with the
methods above, you can use the internal reference voltage to calibrate your
DATUM 2000™.
CAUTION (DATUM 2000™ MANOMETER ONLY): CALIBRATING CHANNEL ONE
OF THE DATUM 2000™ MANOMETER WITH A VOLTAGE INPUT WILL RESULT
IN DAMAGE TO THE DATUM AND WILL VOID THE WARRANTY. THE DATUM
2000™ MANOMETER HAS BEEN CALIBRATED AT THE FACTORY FOR THE
SETRA TRANSDUCER INSTALLED INSIDE. IF YOU WISH TO PERFORM A
CALIBRATION ON THE DATUM 2000™ MANOMETER, YOU MUST APPLY
KNOWN PRESSURE TO THE TRANSDUCER. NEVER APPLY A VOLTAGE
SIGNAL TO THE CHANNEL ONE INPUTS (PINS 6 AND 7) ON THE BACK OF
THE DATUM 2000™ MANOMETER.
NOTE: THE OUTPUT OF THE SETRA TRANSDUCER INSTALLED IN THE
DATUM 2000™ MANOMETER IS AVAILABLE AT THE REAR TERMINAL STRIP
ON PINS 6 AND 7 AND MARKED CHANNEL 1 +IN, CHANNEL 1 -IN.
CALIBRATING THE DATUM 2000™ USING KNOWN PRESSURES
To calibrate the DATUM 2000™ with known pressures, be sure the DATUM
2000™ and the transducer or transmitter is properly connected as described
on pages 4 - 6.
Following the calibration procedures starting on page 18, enter the known
pressure of the system for the calibration points.