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iii)
Matching DP97 to Calibrated Sensors
It is possible to automatically match the DP97 to a Pt100 sensor with up to
10 dedicated calibration values. Such values, published in an associated
certificate indicate true
known reference temperatures. Up to 10 sets of values per sensor can be
fed into the instrument via the RS232 interface using the associated
software supplied with each version 2.1 instrument as standard.
By matching the instrument to a probe on this basis, "corrected"
temperature readings are obtained directly without the need for cross-
referencing to temperature/resistance tables or to the calibration
certificate.
readings.
Refer to sections 6 and 7 for details.
iv)
Error Indications
The DP97 has several modes of error indication according to internal or
external problems as follows:
Display
Only Err 1 / Err 2 would require returning the instrument to our factory.
Note:
During normal operation, if a selected probe is disconnected from the
instrument the display will indicate Err 3 (broken probe indication). If the same probe is
re-connected, Err 3 will remain on the display until any key is pressed.
v)
¾ Wire Recognition
DP97 requires a minimum of 80m
stranded 0.2 mm² wire) to recognise a 4 wire probe.
instrument will default (perhaps incorrectly) to 3 wire mode.
If a simulator is used to apply resistance values to check or calibrate the
DP97 ensure that at least 80m
simulator and the D plug.
This is particularly helpful when taking differential (A-B)
Err 1
Err 2
Err 3
Err 4
BAtt
Or
Ur
versus °C values corresponding t o accurately
Cause
Calibration lost (very unlikely)
Software fault
Broken probe connection
RS 232 command error
"Low" battery
Over-range input
Under-range input
lead resistance (eg. 1 metre of 7
of lead resistance exists between the
Otherwise the
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