Res Conversion; Thermistor T(R) Conversion [Therm-T] - Fluke 1529 User Manual

The A, B, and C coefficients can be converted to , , and
the following formulas:
When the CVD conversion type is selected, the R0, ALPHA, DELTA, and
BETA coefficients are displayed on the right portion of the bottom of the dis-
play. Use the UD buttons to scroll through the coefficients. Use the Enter
button to edit and save the new setting. Press and hold the Exit button to cancel
to the main display or press the EXIT button to cancel and to move to the next
parameter. On the last parameter, press the Exit button to exit to the menu.
7.2.1.5

RES Conversion

The RES conversion displays the measurement as resistance in ohms or K
ohms depending on the range.
When the RES conversion type is selected, the RANGE and WIRES parameters
are displayed on the right portion of the bottom of the display. The UD but-
tons are used to scroll through the parameters. Use the Enter button to change
and save the new settings. Press and hold the Exit button to cancel to the main
display or press the EXIT button to cancel and to move to the next parameter.
On the last parameter, press the Exit button to exit the menu.
The RANGE parameter is used to select the appropriate resistance range. For
25 ohm and 100 ohm PRTs, select 100 ohm and for 1000 ohm PRTs, select 10
K ohm.
The WIRES parameter sets the appropriate number of lead wires from the sen-
sor. This parameter can be set to 2-, 3-, or 4-wires. See Figure 5 on page 22 for
the wiring configuration.
7.2.1.6

Thermistor T(R) Conversion [THERM-T]

The following Steinhart-Hart equation is used for the thermistor T(R)
conversion:
T r K ( )[ ] [
The user-defined parameters for the thermistor T(R) conversion are A0 (A
through A3 (A
port. If A
0.0.
Note: Thermistor coefficients stated on the thermistor calibration report may be
labeled differently. The best way to identify the coefficients to use with this
type is to match the equation above with the equation given on the calibration
report. Also, recognize that the coefficients for this equation generally have
negative exponents, e.g. A3: 1.39456E-07.
100
A 100 B
A
100 B
A A r ln A ln
0 1 2
) as shown on a typical Hart Scientific thermistor calibration re-
3
is not used, as is the case with some calibrations, A2 should be set to
2
8
10 C
A 100 B
1
2 3 1
r A ln r ]
3
7 Menu Functions
Probe Menu
coefficients using
)
0
39