Phase; Calculating Power Specifications - Fluke 5080A Service Manual

5080A
Service Manual

Phase

45 TO 65 Hz
[1] See Power and Dual Output Limit specifications for applicable outputs.
[2] Phase settling times are typically <18 seconds additional.
Phase (Φ) Watts
0 °
10 °
20 °
30 °
40 °
50 °
60 °
70 °
80 °
90 °
Notes
To calculate exact ac watts power factor adders due to phase error for values not shown, use the following formula:
For example, for a PF of 0.9205 (Φ = 23) and a phase specification of ΔΦ = 0.15, the ac watts power factor adder is:

Calculating Power Specifications

The Overall specification for power output in watts (or VARs) is based on the root sum square (rss) of the individual
specifications in percent for the selected voltage, current, and power factor or VARs parameters:
Watts specification
VARs specification
Because there are a tremendous number of combinations, you should calculate the actual power specification for your
selected voltages and currents. The method of calculation is best shown in the following examples (using 1-year
specifications):
Example 1 Output: 100 V, 1 A, 60 Hz, Power Factor = 1.0 (Φ=0), 1-year specifications
Voltage Specification Specification for 100 V at 60 Hz is 0.14 % + 18 mV, totaling:
100 V x 0.0014 = 140 mV added to 18 mV = 158 mV. Expressed in percent:
158 mV/100 V x 100 = 0.158 % (see "AC Voltage Specifications").
Current Specification Specification for 1 A at 60 Hz is 0.10 % + 1200 μA, totaling:
1 A x 0.001 = 1000 μA added to 1200 μA = 2.2 mA. Expressed in percent:
2.2 mA/1 A x 100 = 0.22 % (see "AC Current Specifications").
PF Adder Watts Adder for PF = 1 (Φ=0) at 60 Hz is 0 % (see "Phase Specifications").
Total Watts Output Specification =
Example 2 Output: 100 V, 1 A, 50 Hz, Power Factor = 0.5 (Φ=60), 1-year specifications
Voltage Specification Specification for 100 V at 50 Hz is, 0.14 % + 18 mV, totaling:
100 V x 0.0014 = 140 mV added to 18 mV = 158 mV. Expressed in percent:
158 mV/100 V x 100 = 0.158 % (see "AC Voltage Specifications").
Current Specification Specification for 1 A is 0.10 % + 1200 μA, totaling:
1 A x 0.001 = 1000 μA added to 1200 μA = 2.2 mA. Expressed in percent:
2.2 mA/1 A x 100 = 0.22 % (see "AC Current Specifications").
12
Specification, 1 year, tcal ±5 °C, ±(ΔΦ)
0.25 °
Phase (Φ) VARs
90 °
80 °
70 °
60 °
50 °
40 °
30 °
20 °
10 °
0 °
Adder
( )
Adder %
Spec
Spec
Spec
65 to 500 Hz
1.5 °
Power Factor Adder due to Phase Error, ±(%)
PF
45 to 65 Hz
1.000 0.00 %
0.985 0.08 %
0.940 0.16 %
0.866 0.25 %
0.766 0.37 %
0.643 0.52 %
0.500 0.76 %
0.342 1.20 %
0.174 2.48 %
0.000 -
Φ ΔΦ +
Cos (
( )
= −
% 100 1 (
( )
Φ
Cos
+
Cos (23 . 15
= −
100 1 (
( )
Cos 23
= 2 +
Spec Spec
power voltage
= 2 +
Spec Spec
VARs voltage
= 2 +
. 0 158 . 0
power
[1][2]
500 Hz to 1 kHz
5.0 °
65 to 500 Hz 500 Hz to 1 kHz
0.03 %
0.50 %
0.99 %
1.55 %
2.23 %
3.15 %
4.57 %
7.23 %
14.88 %
-
)
)
)
=
) . 0 11 %
2 + 2
Spec
current PFadder
2 + 2
Spec
current VARsadder
2 + 2 =
22 0 . 0 27 %
0.38 %
-
-
-
-
-
-
-
-
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