Voltech AT5600, Руководство пользователя

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C H A P T E R 1 0 – 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:
𝐴
𝑇
= 𝐴
𝑅
+ 𝐴
𝐶
+ 𝐴
𝑉
+ 𝐴
𝑆𝑅𝐶𝐸
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:
𝐴
𝑅
= 0.10 %
𝐴
𝐶
= 0.08 % + (0.001 % ∗ 𝐹
𝑀
)
𝐴
𝑉
= 0.03 % + (
0.01 %
𝑉
𝑀
)
𝐴
𝑆𝑅𝐶𝐸
= 0.5 % (𝐹𝑜𝑟 𝑚𝑎𝑛𝑢𝑎𝑙 𝑜𝑟 𝑙𝑖𝑛𝑒 𝑠𝑢𝑝𝑝𝑙𝑦)
𝐴
𝑆𝑅𝐶𝐸
= 0.0 % (𝐹𝑜𝑟 𝑎𝑛𝑎𝑙𝑜𝑔, 𝑎𝑚𝑝𝑙𝑖𝑓𝑖𝑒𝑟 𝑜𝑟 𝐴𝑇 𝑜𝑢𝑡𝑝𝑢𝑡 𝑡𝑥)
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.