Fluke Biomedical 601PRO XL - Manual (Page 168)

6 0 1 P R O S E R I E S
X L
A - 4
(c) Specified accuracy for load inductance up to 120 µH and phase angle greater
than 10 degrees:
1A and 25 A:
5% of reading ± 30 m
Ω
(resistance range of 10-99 m
Ω
)
5% of reading ± 15 m
Ω
(resistance range of 100-2999 m
Ω
)
10 A:
5% of reading ± 50 m
Ω
(resistance range of 10-99 m
Ω
) for 10 A
5% of reading ± 35 m
Ω
(resistance range of 100-2999 m
Ω
) for 10 A
(d) Specified accuracy for load inductance up to 420 µH and phase angle greater
than 10 degrees:
5% of reading ± 40 m
Ω
(1A setting, resistance range of 10-2999 m
Ω
)
10 A and 25 A measurements not specified above 120 µH
Technical Notes:
If the load inductance and phase angle of the load are unknown, performing the
following test may approximate their magnitudes:
• Make resistance measurements at both 1A and 25A current levels and calculate
the difference.
⇒ If this difference is greater than 5% ± 4 m Ω of the 1 A reading, the
inductance and phase angle of the load has exceeded 60 µH and/or
10 degrees.
⇒ If the difference is 5% ± 35 m Ω of the 1 A reading, the inductance and phase
angle has exceeded 120 µH and/or 10 degrees.
⇒ Finally, if the difference is greater than 5% ± 150 m Ω of the 1 A reading, the
inductance and phase angle of the load has exceeded 420 µH and/or 10
degrees.
This test is based on the observation that as the load inductance exceeds
60 µH or the load phase angle exceeds 10 degrees, the 1 A and 25 A measurements
increasingly differ in value.