PromLegion DX4085, Руководство пользователя

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Z-Meter DX4085/ User Guide PromLegion Ltd
the positive signal (
𝑈𝑈
𝑝𝑝𝑎𝑎
) and negative signal (
𝑈𝑈
𝑎𝑎𝑎𝑎
) are used for a TE
module resistance (
𝑅𝑅
) calculation by the following formula:
𝑅𝑅 =
∑ (𝑈𝑈
𝑝𝑝𝑎𝑎
− 𝑈𝑈
𝑎𝑎𝑎𝑎
)
𝑎𝑎
𝑎𝑎=1
2𝐼𝐼
𝑚𝑚
𝐴𝐴
𝐴𝐴
𝑐𝑐
(6.1.1)
where
𝐴𝐴
𝐴𝐴
-
voltage gain of the instrumentation amplifier;
𝑐𝑐
- total number of readouts per measurement.
Typical values of parameters in formula (6.1.1) are:
𝐼𝐼
𝑚𝑚
= 2 mA,
𝐴𝐴
𝐴𝐴
= 5 or 50,
𝑐𝑐
= 50.
10.2. The
𝑼𝑼
and
𝑼𝑼
𝜶𝜶
Telemetry
During measurement of the parameters
𝑈𝑈
and
𝑈𝑈
𝛼𝛼
, a small current
𝐼𝐼
𝑚𝑚
is applied to TE module periodically (with 50% duty cycle).
Two successive measuring sessions are necessary to obtain the
𝑈𝑈
and
𝑈𝑈
𝛼𝛼
values at different testing current polarities.
ver. 1.00 (2017) page 59 of 64