Ashcroft ATE-2 - Handheld Calibrator - Manual (Page 46)

44
Use DOWN or UP ARROW to highlight “Channel”…
Press ENTER
Use DOWN or UP ARROW to highlight “CH1” “CH2”
Press ENTER
Note: If the incorrect type of module is installed a “MODULE
ERROR” message will be shown.
Return to RTD Module screen
Use DOWN or UP ARROW to highlight “Probe connection…”
Press ENTER
Use DOWN or UP ARROW to highlight “2-wire…”, “3-wire…”, or
“4-wire…”
Press ENTER
Return to RTD Module screen
Use DOWN or UP ARROW to highlight “Probe select…”
Press ENTER
Use DOWN or UP ARROW to highlight “Probe 01 through 08…”
(per table above)
Press ENTER
Return to RTD Module screen
Use DOWN or UP ARROW to highlight “Resolution…”
Press ENTER
Use DOWN or UP ARROW to highlight “1”, “0.1”, ”0.01”or “0.001”
Press ENTER
Return to RTD Module screen
Use DOWN or UP ARROW to highlight “Apply”
Press ENTER
Programmed settings are saved to memory and HHC returns to
Measurement Mode with RTD operating as programmed above.
Note: The maximum resolution that the combination of the HHC
base unit and the RTD interface module and probe can support
can be determined as follows:
The resolution of the RTD module is 0.001% of the full scale
resistance of the reference resistor used in the module. The XXX-
RT1 incorporates a 400 ohm reference resistor and the XXX-RT2
incorporates a 4000 ohm resistor.
Using the XXX-RT1 with a PT100 probe as the example the
maximum resolution is:
0.001% of 400ohms = 0.004 ohms
0.004 ohms/(100 ohms x 0.00385 ohms/degree) =0.0104
degrees C
Therefore rounding to the nearest digit results in a resolution of
SECTION 15 j. RTD TEMPERATURE
MEASUREMENT CONT.
RTD Module
Channel…
Probe connection…
Probe Select…
Resolution…
Apply
–0.017
PSi degF
77.9