Strx & Watx - Stress Wattage & Wattage - Voltech AT3600 User Manual

5.4. STRX & WATX – S
The measurement accuracy is based on the chosen test conditions, and is given by:
where:
The accuracies of the MAGX and VOCX measurements are computed from the formulae in 5.2 and 5.3
where:
and:
where:
When performing either of these tests, the AT3600/AT5600 automatically applies the test voltage to the part
under test and checks that the voltage has stabilized before recording measurements.
The time that the voltage takes to stabilize will vary with the source type used and the nature of the part
under test.
In general (and especially for source types 'Programmable' and 'AT Output Transformer'), the
AT3600/AT5600 will record a measurement very quickly, (typically in less than 0.5 seconds) which is
desirable in a production test environment.
If the measurement were to be recorded after a longer period under power, slightly different readings may
be obtained due to self-heating effects in the part under test.
This effect may be noticed when comparing results taken using different source types or with slower
measurement systems.
V AC I U
OLTECH NTERFACE SER
W
TRESS ATTAGE
����
is the total accuracy (%)
A
T
is the accuracy of the MAGX current measurement (%)
A
MAGX
is the accuracy of the VOCX voltage measurement (%)
A
VOCX
is the correction for power factor (%)
A
PF
is the test frequency (Hz)
F
M
PF is the power factor of the load
is the measured power (W)
W
is the product of MAGX and VOCX results
VA
M 98-072 7
ANUAL ISS
S
& W
ATTAGE
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48