AVTECH ELECTROSYSTEMS LTD. AVX-S3B-P3-NUFB Інструкція з експлуатації - Сторінка 11

Переглянути онлайн або завантажити pdf Інструкція з експлуатації для Блок управління AVTECH ELECTROSYSTEMS LTD. AVX-S3B-P3-NUFB. AVTECH ELECTROSYSTEMS LTD. AVX-S3B-P3-NUFB 11 сторінок. Current-quadrupling output module with plug-in socket

Друкувати сторінку

MEASUREMENT ISSUES

It is very difficult to accurately observe the electrical waveforms in the AVX-S3B-P3-

NUFB system. The "MV" and "MI" outputs will display noticeable ringing and inaccurate

rise times due to the effect of parasitic inductance and the low resistances present (R

= 2.4 Ω).

It may be possible to install current probes (such as the Integrated Sensor

Technologies 711S, http://www.isensortech.com) to observe current waveforms on the

output socket, but in practice the extra inductance that is added by the measurement

system will result in poor measurements. Inductive time constants (given by τ = L / R)

will become significant. For instance, if 0.5" of wire is inserted between the LD+ and LD-

socket pins (pins 7 and 6), and this wire is fed through a 711S probe, this will introduce

approximately 5 nH of inductance. The inductive time constant will then by 5 nH / 2.4 Ω

= 2.1 ns.

As a result, the only true measure of the system rise time is to observe the optical

output.