Working Standard
User’s Guide
www.appliedp.com WS-UGFW619-EN
6.5 Measurement Time
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.
6.6 Measurement Error
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:
( )
TEMPPHASEAMPLWS
LIMITLIMITLIMITLIMIT ++
22
LIMIT
WS
............... overall error [in %]
LIMIT
AMPL
............ amplitude error [in %] (defined in technical specification)
LIMIT
PHASE
........... phase error [in %]
LIMIT
TEMP
............ temperature error [in %]
Calculation of phase error for active power:
PHASEDEGPHASE
LIMITKtgLIMIT = )(100
Calculation of phase error for reactive power:
PHASEDEGPHASE
LIMITKgLIMIT = )(cot100
Calculation of temperature error:
K ......................... conversion constant (to radians):
φ ......................... phase angle between voltage and current [°]
LIMIT
PHASEDEG
...... phase error [in %] (defined in technical specification)
T .......................... temperature at measurement
T
SPEC
.................... temperature defined in technical specification: T
SPEC
=23˚C
TC ....................... temperature coefficient of the device:
TC
= 0.005 %/˚C .......... for WS 2x20B and WS 2x20A
TC
= 0.010 %/˚C .......... for WS 2x20C
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