C H A P T E R 10 – S P E C I F I C A T I O N S
AT5600 User Manual 98-119 issue 14 Page 217
10.2.9. VOCX Test (External Source)
The accuracy is based on the chosen test conditions, and is given by:
where:
A
T
is the total accuracy (%)
A
R
is the basic relative accuracy (%)
A
C
is the calibration accuracy (%)
A
V
is the correction for voltage level (%)
A
SRCE
is the correction for external source type (%)
where:
where:
F
M
is the test frequency (Hz)
V
M
is the measured voltage (V)
During a VOCX test the 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 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.
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