Fluke 8808A - 4-Wire Ohms Verification

8808A
Calibration Manual
3-6
4-Wire Ohms Verification
To verify the 4-Wire Ohms function of the Meter, connect it to the test equipment as
shown in Figure 3-2 and apply the resistances listed in Table 3-4.
HI
LO
1000V
750V
2W/4W
MAX
INPUT SENSE
HI
LO
4W
10 A
mA
200mA
MAX
10 A
MAX
1000V CAT I
600 V CAT II
500 V pk
V
1V
300V
OUTPUT
V A
SENSE
VA
AUX
CURRENT
GUARD
GROUND
WIDEBAND
HI
LO
HI
HI
LO
Ω
UUT 57X0A
Input
Input
HI
LO
HI
LO
Output
Output
HI
LO
HI
LO
Sense
NC
NC
Sense
Sense 4W
Sense 4W
Connect 57X0A and 5725A Callibrator to the UUT as follows:
57X0A8808A
Set 57X0A to EXT Sense
ffw003.eps
Figure 3-2. 4-Wire Ohms Test Setup
Table 3-4. 4-Wire Ohms Verification Steps
90-Day Test Limit 1-Year Test Limit
Nominal
Input
Range
High Low High Low
0 Ω 200 Ω 0.008 Ω -0.008 Ω 0.008 Ω -0.008 Ω
190 Ω 200 Ω STD+0.046 Ω
[1]
STD-0.046 Ω
[1]
STD+0.065 Ω
[1]
STD-0.065 Ω
[1]
0 kΩ 2 kΩ 0.00004 kΩ -0.00004 kΩ 0.00006 kΩ -0.00006 kΩ
1.9 kΩ 2 kΩ STD+0.00033 kΩ
[1]
STD-0.00033 kΩ
[1]
STD+0.00044 kΩ
[1]
STD-0.00044 kΩ
[1]
0 kΩ 20 kΩ 0.0004 kΩ -0.0004 kΩ 0.0006 kΩ -0.0006 kΩ
19 kΩ 20 kΩ STD+0.0033 kΩ
[1]
STD-0.0033 kΩ
[1]
STD+0.0044 kΩ
[1]
STD-0.0044 kΩ
[1]
[1] 5700 reading + resistance