SPECIFICATION VOLTECH AT3600 USER MANUAL
PAGE 8.1.18. VPN 98 - 024 SPECIFICATION
WATX AND STRX TESTS (EXTERNAL SOURCE)
The accuracy for the measurement is given by:
A
T
= A
MAGX
+ A
VOCX
+ A
P
Where:
A
T
is the total accuracy (%)
A
MAGX
is the accuracy for the current measurement (see MAGX
specification) (%)
A
VOCX
is the accuracy for the voltage measurement (see VOCX
specification) (%)
A
P
is the correction for the power factor (%)
and
A
P
= (1 + 0.0007 * F
M
) * (ā(1 ā PF
2
) / PF)
where
PF is the power factor of the load. (PF = W / VA)
F
M
is the measurement frequency (Hz)
When performing either of the above tests, the AT3600 automatically applies the test
voltage to the part under test and checks that the voltage has stabilised before
recording measurements. The time that the voltage takes to stabilise 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 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 of time 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.
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