Power Factor Calculation (Pf) - PCE Instruments F 09 Manual De Instrucciones

Nota : same results are achieved with the following couples
of measurement : U with I
23
µ
In both cases the " " arrow on the jaws, must be directed
in the direction of power circulation from the source to the
load. In which case:
- the "+" sign corresponds to power consumed by the load.
- the "-" sign corresponds to power supplied by the load.
Specific reference conditions
I I I I I
PF = 1; I ≥ 2 A; U ≥ 10 V
Active power measurement characteristics
I I I I I
Display range 4000 W
Measuring range (2) 5 to
3999 W
Accuracy (3)
Resolution 1 W
Reactive power measurement characteristics
I I I I I
Display range 4000 var
Measuring range (2) 5 to
3999 var
Accuracy (3)
Resolution 1 var
Apparent power measurement characteristics
I I I I I
Display range 4000 VA
Measuring range (2) 5 to
3999 VA
Accuracy (3)
Resolution 1 VA
1) the scale is limited to 240 kW (kvar, kVA) in one-phase
(
(600 V x 400 A) and 399.9kW (kvar kVA) in 3 phases system.
Above this value, the display indicates +OL or -OL depending
on the sign of the power.
(2) if the power value is < 5 W or if the voltage or current
values are respectively < 0.15 V or < 0.15 A, 0 is displayed.
(3) The measurement accuracy is affected by an instability
linked to current measurement of approximately 0.1 A.
Example: for a power measurement performed at 10 A, the
instability of the measurement will be 0.1 A/10 A, or 1%.
MIN/ MAX Mode:
I I I I I
- Accuracy: same as previous table +0.3% L
- Capture time: 100 ms typ. (every 400 ms)

3.9 Power factor calculation (PF)

With the clamp configured in power measurement (switch
on position W) and correctly connected (see § 3.8), perform
a short press on the yellow key: the power factor is displayed.
The power factor is, by definition, an unsigned quantity,
however, a sign is displayed showing whether the charge is
inductive ("+" sign) or capacitive ("-" sign). This sign is
significant only in the case of slightly distorted signals (i.e. 3
switches to zero over 1 period).
and U with I .
1 31 2
40 kW 400 kW
4,00 kW to 40,0 kW to
39,99 kW 240,0 kW -399,9kW (1)
2% L + 1 pt
10 W 100 W
40 kvar 400 kvar
4,00 kvar to 40,0 kvar to
39,99 kvar 240,0 kvar -399,9kvar (1)
2% L + 1 pt
10 var 100 var
40 kVA 400 kVA
4,00 kVA to 40,0 kVA to
39,99 kVA 240,0 kVA -399,9kVA (1)
2% L + 1 pt
10 VA 100 VA
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