Fluke 8845A FE 8845A & 8846A Users Manual - Page 75

Measuring RTD Temperature (8846A only), Input, Function modifiers

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4 Making Measurements Measuring RTD Temperature (8846A only) Refer to the "Range Keys" section in Chapter 3 of this manual for information on how to adjust the measurement range. Measuring RTD Temperature (8846A only) The Fluke 8846A is capable of measuring temperatures between -200 °C and 600 °C using Resistance Temperature Detectors (RTDs). To make a temperature measurement: 1. Connect the RTD to the Input HI, and LO, then the SENSE HI and LO connectors as shown in Figure 4-7. INPUT V 2W/4W HI SENSE 4W HI 1000 V CAT I 600V CAT II 300 V LO LO 1V FUSED 100 mA 10 A REAR FRONT Figure 4-7. Temperature Measurements 2. Press T to display the measured temperature as shown below. caw028.eps - 246.645 ºF F1 F2 F3 F4 F5 caw11f.eps To change the temperature scale, refer to the "Setting the Default Temperature Scale" section in Chapter 3 of this manual. Available scales are Celsius, Fahrenheit, and Kelvin. Refer to the "Adjusting the Meter's Range" section in Chapter 3 of this manual for information on how to adjust the measurement range. Function modifiers: 4Wire Switches the measurement input connectors to 4-wire measurement for 4-wire RTDs. 4-wire RTDs make more accurate measurements. RTD 385 Default RTD type. All coefficients are predefined. RO Used to select a different value of RTD resistance at 0 °C. ALPHA Used to set the first coefficient of the Callendar-Van Dusen equation. 2ND MEAS Cycles the secondary display through the measurement functions listed below and then off. 4-13

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Making Measurements
Measuring RTD Temperature (8846A only)
4
4-13
Refer to the “Range Keys” section in Chapter 3 of this manual for information on how to
adjust the measurement range.
Measuring RTD Temperature (8846A only)
The Fluke 8846A is capable of measuring temperatures between -200
°
C and 600
°
C
using Resistance Temperature Detectors (RTDs).
To make a temperature measurement:
1.
Connect the RTD to the
Input
HI
, and
LO
, then the
SENSE
HI
and
LO
connectors
as shown in Figure 4-7.
2
INPUT
SENSE
HI
LO
FRONT
REAR
10A
1V
100
mA
4
W
HI
LO
2W/4W
V
300V
FUSED
1000V CAT I
600V CAT II
caw028.eps
Figure 4-7. Temperature Measurements
2.
Press
T
to display the measured temperature as shown below.
- 246.645
º
F
F1
F2
F3
F4
F5
caw11f.eps
To change the temperature scale, refer to the “Setting the Default Temperature Scale”
section in Chapter 3 of this manual. Available scales are Celsius, Fahrenheit, and Kelvin.
Refer to the “Adjusting the Meter’s Range” section in Chapter 3 of this manual for
information on how to adjust the measurement range.
Function modifiers:
4Wire
Switches the measurement input connectors to 4-wire measurement
for 4-wire RTDs. 4-wire RTDs make more accurate measurements.
RTD 385
Default RTD type. All coefficients are predefined.
RO
Used to select a different value of RTD resistance at 0
°
C.
ALPHA
Used to set the first coefficient of the Callendar-Van Dusen equation.
2ND MEAS
Cycles the secondary display through the measurement functions
listed below and then off.