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Measurement Time (time needed for new sample) is defined by Integration Time, which is stated in
Test Settings of device.
If time between marks / impulses from the meter under test is longer than Integration Time then
Measurement Time is equal to time between capturing marks from the meter.
Measurement Error Limits (tolerances of precision) in basic load points and temperature 23 °C are
defined in technical specification. Measurement Error Limit for power measurement in other load points
and temperatures is:
LIMIT
WS
LIMIT
AMPL
LIMIT
PHASE
LIMIT
TEMP
Calculation of phase error for active power:
Calculation of phase error for reactive power:
=
LIMIT
100
PHASE
Calculation of temperature error:
K ......................... conversion constant (to radians):
φ ......................... phase angle between voltage and current [°]
LIMIT
PHASEDEG
T .......................... temperature at measurement
T
.................... temperature defined in technical specification: T
SPEC
TC ....................... temperature coefficient of the device:
www.appliedp.com
6.5 Measurement Time
6.6 Measurement Error
............... overall error [in %]
............ amplitude error [in %] (defined in technical specification)
........... phase error [in %]
............ temperature error [in %]
cot
g
(
)
K
LIMIT
...... phase error [in %] (defined in technical specification)
TC = 0.005 %/˚C .......... for WS 2x20B and WS 2x20A
TC = 0.010 %/˚C .......... for WS 2x20C
WS-UGFW619-EN
PHASEDEG
Working Standard
User's Guide
=23˚C
SPEC
103
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