3000.doc Iss. 2/00
9
SENSOR CONFIGURATION
The 3002 thermometers offer real flexibility, with 3 standard Pt100 linearisations plus a user
option. These options may be selected as follows.
Press key SENS and menu will display the options:
IEC751: Linearises in accordance with IEC751 tables with Ro=100ohm & Ra=3850
US/JIS: Linearises in accordance with US and JIS tables Ro=100ohm & Ra=3916
EN-751: Linearises in accordance with ITS90 Standards Ro=100ohm & Ra=3851
Usr Enables probe specific coefficients to be programmed and stored and recalled with probe
identification serial number. The top line of the display shows the configuration of the probe
selected, it is permitted to set channels A & B to different configurations. The information is
displayed as follows:
Channel identification Standard selected Ro Ra 3 or 4 wire.
(If A-B is displayed then this status line blanks)
To change a sensor configuration first select Usr, and enter probe number (1 to 20) and
confirm with OK key. To review/edit the coefficients press the Rev button, the upper half of
the display will shows the probe coefficients Ro, A, B, & C values. The lower half of the
display enables these coefficients to be edited by selecting Yes, each value may now be
changed individually by pressing the key directly below the option required. (e.g. press Ro
and you will be asked to enter the Ro value). Confirm this selection with OK, at this point the
value is not written to the memory and it is possible to return to the previous setting. Once all
the coefficients have been edited press OK you will then be asked if these new
coefficients should be stored in the memory, press No and you will exit the edit menu without
storing the new values. Press Yes and the new coefficients will be stored . Press Quit to return
to the measuring screen.
Fig.5: Review menu for probe characteristics Fig.6: Edit menu for probe characteristics
UNIT This key changes the units of the temperature display, each key press will change the units to
the next available in the order °C °F K
RESN When the thermometer first powers up the display defaults to a resolution of 0.01, this
resolution can be increased to 0.001 by pressing the RESN key, pressing again returns the
resolution to 0.01
MATH This takes you into the maths function of the thermometer and allows statistical analysis of
stored values to be displayed. (use the Log function to store these values) Press Stats and the
following values will be displayed, Max and Min values, Mean value, Peak to peak value,
and Standard deviation. The number of samples these values are derived from is also
displayed.
Fig 8. Stats Menu Fig.7 Display of statistics
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