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when all the digits are correct. If the password is entered correctly the first pa
-
rameter in the menu will appear.
6.4 Selecting the Probe Characterization
Before the 1504 can measure temperature accurately it must know how to cal
-
culate temperature from the resistance of the sensor. You must enter the proper
characterization coefficients. The coefficients are determined when the probe is
calibrated.
Two types of characterizations can be used with the 1504: Steinhart-Hart and
Callendar-Van Dusen.
6.4.1 Setting the Probe Characterization Type
The probe characterization type and characterization coefficients are set in the
Probe menu. Press the Menu/Enter button (“SEt?” appears), then the
C/Probe button. The menu name, “ProbE”, will appear briefly then the char
-
acterization type. The probe characterization types are indicated on the display
as follows:
Pr= thr Steinhart-Hart thermistor
Pr= rtd
Callendar-Van Dusen RTD
Select the desired probe characterization type using the U and D buttons
and pressing the Menu/Enter button. After the characterization type is se-
lected the characterization coefficients follow.
6.4.2 Setting the Characterization Coefficients
Probe characterization coefficients are set within the Probe menu after select
-
ing the probe characterization type. Each coefficient appears with the name of a
coefficient shown briefly followed by its value. The mantissa with its sign ap
-
pears first (positive sign appears as “
+”).
b0
+4.336079
Use the L and R buttons to move between the digits (and the sign).
The selected digit will flash. Use the U and D buttons to change a
digit. Once the sign and digits are correct, press Enter to accept the num
-
ber. If you decide to cancel any changes you have made, you may do so by
pressing the
/Exit button. This will immediately skip to the next coefficient.
The exponent of the coefficient is set after the mantissa.
19
6 General Operation
Selecting the Probe Characterization