Fluke 5500A - Page 36

5500A
Service Manual
1-22
5500A Phase Specifications (cont.)
Phase
(Φ)
Phase
(Φ)
PF Power Uncertainty Adder due to Phase Error
Watts VARs 10 to 65 Hz 65 to 500 Hz 500 to 1 kHz 1 to 5 kHz 5k to
10 kHz
0 degrees 90 degrees 1.000 0.00% 0.01% 0.06% 0.55% 1.52%
5 85 0.996 0.02 0.15 
10 80 0.985 0.05 0.29 
15 75 0.966 0.07 0.43 
20 70 0.940 0.10 0.58 
25 65 0.906 0.12 0.74 
30 60 0.866 0.15 0.92 
35 55 0.819 0.18 1.11 
40 50 0.766 0.22 1.33 
45 45 0.707 0.26 1.58 
50 40 0.643 0.31 1.88 
55 35 0.574 0.37 2.26 
60 30 0.500 0.45 2.73 
65 25 0.423 0.56 3.38 
70 20 0.342 0.72 4.33 
75 15 0.259 0.98 5.87 
80 10 0.174 1.49 8.92 
85 5 0.087 2.99 17.97 
90 0 0.000   
To calculate exact ac watts power adders due to phase uncertainty for values not shown, use the
following formula
:
()
()
Adder
Cos
Cos
%(
()
=−
+
100 1
Φ
∆Φ
Φ
)
. For example: for
a PF of .9205
(Φ = 23) and a phase uncertainty of
∆Φ
= 0.15, the ac watts power adder is:
()
()
Adder
Cos
Cos
%(
(23 )
=−
+
=100 1
15
23
011%
.
).