Fluke 8808A User Manual - Page 45

Frequency Ranging, Measuring Resistance, 2-Wire Resistance Measurement

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3 Operating the Meter from the Front Panel Selecting a Measurement Function Frequency Ranging Frequency measurements are automatically ranged so that a frequency measurement is always displayed with maximum resolution. To select a range manually, press F to select the frequency function, and then press U or V to select a range manually. Manual ranging can be performed on readings displayed in the primary display only. If you manually select a frequency range and the measurement exceeds the full-scale value of that range, 0L is displayed to indicate an overload. If the frequency is lower than 20 Hz, UL is displayed. Refer to the "Electrical Specifications" section in Chapter 1 for frequency ranges and full-scale values. Measuring Resistance The Meter offers 2-wire and 4-wire ohms measurement. Press O to toggle between 2wire and 4-wire measurement modes. The Meter displays 2*4 Wire at 2 wire or 2x4 wire resistance measurement and displays 4 Wire at 4 wire resistance measurement. 2-Wire Resistance Measurement To perform a 2-wire resistance measurement: 1. Connect test leads between the Meter and the circuit under test as shown in Figure 3-5. 2. If required, press O to select 2-wire resistance measurement mode. 2*4 Wire is displayed. The function and measurement are displayed. 2W/4W HI INPUT V SENSE 4W HI 1000V 750V MAX LO 200 mA MAX 1000 V 600 V CAT I CAT II 300 V 1V LO 500 Vpk 10 A MAX mA 10 A Figure 3-5. 2-Wire Resistance Measurement eue11.eps 3-11

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Operating the Meter from the Front Panel
Selecting a Measurement Function
3
3-11
Frequency Ranging
Frequency measurements are automatically ranged so that a frequency measurement is
always displayed with maximum resolution.
To select a range manually, press
F
to select the frequency function, and then press
U
or
V
to select a range manually. Manual ranging can be performed on readings
displayed in the primary display only.
If you manually select a frequency range and the measurement exceeds the full-scale
value of that range,
0L
is displayed to indicate an overload. If the frequency is lower than
20 Hz,
UL
is displayed. Refer to the “Electrical Specifications” section in Chapter 1 for
frequency ranges and full-scale values.
Measuring Resistance
The Meter offers 2-wire and 4-wire ohms measurement. Press
O
to toggle between 2-
wire and 4-wire measurement modes. The Meter displays
2*4 Wire
at 2 wire or 2x4 wire
resistance measurement and displays
4 Wire
at 4 wire resistance measurement.
2-Wire Resistance Measurement
To perform a 2-wire resistance measurement:
1.
Connect test leads between the Meter and the circuit under test as shown in
Figure 3-5.
2.
If required, press
O
to select 2-wire resistance measurement mode.
2*4 Wire
is
displayed.
The function and measurement are displayed.
HI
LO
1000V
750V
2W/4W
MAX
INPUT
SENSE
HI
LO
4
W
10A
mA
200 mA
MAX
10 A
MAX
1000 V
CAT I
600 V
CAT II
500 Vpk
V
1V
300V
eue11.eps
Figure 3-5. 2-Wire Resistance Measurement