Setra Systems DATUM 2000, Руководство по эксплуатации

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3.0 Operating notes
3.1 OvEr and UndEr messages
In addition to displaying the numeric pressure reading, the DATUM 2000™ may
also display “UndEr” and “OvEr”. If the pressure reading e31999 (disregard
decimal point), the display will not show the input pressure, instead it will display
“OvEr”. If the pressure reading is less than -9999 (disregard decimal point), the
display will not show the input pressure, instead it will display “UndEr”.
3.2 Sampling rate
The DATUM 2000™ will read the channel, 2 to 3 times a second. The speed of the
update is determined by the voltage of the channel being read. If the meter has two
channels calibrated, it will display each channel for 8 readings, and then switch to
the other channel. The exact time the meter will display a channel is dependent on
the voltage of that channel. Each channel will be displayed for approximately 3 to
4 seconds.
3.3 Locking onto a channel
Press the HOLD/mode key to force the DATUM 2000™ to continuously display the
present channel. Upon power-up, the DATUM 2000™ will display both channels
.
3.4 Displaying both channels
Press the SCAN/adj key to for the DATUM 2000™ to resume displaying both channels
3.5 Manometer analog output
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.
3.6 Rapidly changing input signal
For a signal whose magnitude is increasing very rapidly, the DATUM 2000™ can
select the wrong integration time. This can cause a single reading overflow of the
A/D converter. This overflow can cause the sign of the reading to be incorrectly set.
Such an occurrence can cause an improper setting of the incorrectly set. Such an
occurrence can cause an improper setting of the alarms. This condition will self-
correct once the input signal has stabilized. This occurrence will rarely, if ever, be
seen.
3.7 Test mode
There us a test mode in which the DATUM 2000™ will display the output of the A/D
converter reading of Channel 1 without performing the units conversion. This mode
is accessible only by holding both the SCAN/adj and HOLD/mode keys down when
the power is applied to the DATUM 2000™. If you accidentally enter this mode, you
can exit by pressing wither key.