Fluke 8845A, Руководство пользователя

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Making Measurements
Testing Continuity
4
4-15
- 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 Calendar-Van Dusen equation.
2ND MEA
Cycles the secondary display through the measurement functions
listed below and then off.
OHMS
- Displays the resistance of the RTD. 2-wire resistance is used
when in 2-wire temperature mode and 4-wire resistance when the
Meter is in 4-wire RTD mode.
Testing Continuity
Continuity testing determines whether a circuit is intact (i.e., has a resistance less than the
threshold). The threshold is selectable between 1 and 1000
Ω
.
To perform a continuity test:
1.
Press
S
on the 8846A or
Q
on the 8845A. An example of the continuity display
is shown below.
OPE N
F1 F2 F3 F4 F5
caw12f.eps
Connect the test leads as shown in Figure 4-1.
Note
The Beeper cannot be disabled in continuity. Pressing BEEPER OFF turns
off the beeper for errors.
To set the threshold value, refer to the “Setting the Continuity Threshold Resistance”
section in Chapter 3 of this manual.
Function modifiers: