Tuesday, November 24, 2009

How to use multimeter check the SCR

Sub-way and two-way SCR SCR SCR 2 kinds, all three electrodes. One-way thyristor cathode (K), anode (A), control the pole (G). BTA is equivalent to two parallel single silicon reverse-made. That is one way in which a silicon anode and cathode relative to the other side with its leads, said terminal T2 pole, in which a single silicon cathode-anode connected with another, which leads to terminal T2, said pole, and the remaining, compared with control pole (G).

1, single, bi-directional thyristor discriminant: first as test two poles, if the positive and negative test are not moving the pointer (R × 1 block), may be A, K, or G, A pole (for a one-way thyristor ) may also be T2, T1 or T2, G pole (for bi-directional SCR). If one has a measurement direction for the tens to hundreds of Europe, use a one-way thyristor. Hong Bi, K and then by a very, black pen then for G polar, and the remaining shall be A great. If positive, the reverse test instructions are tens to hundreds of Europe, use a bidirectional thyristor. Knob and then allocated to the R × 1, or R × 10 block retest, which must have a resistance slightly larger, then the larger one for the G Hongbi then very, black pen by then most of T1, T2 rest is a very .

2, the performance difference: The dial knob to the R × 1 block, for 1 ~ 6A-way thyristor, then K Hong Bi polar, black pen at the same time connected to G, A pole, keeping out of black ink is not very state of A Next disconnect the G pole, indicators should be instructed to dozens of Europe to the 100 in Europe, at this time SCR has been triggered, and the trigger voltage is low (or trigger current small). A very transient and then disconnect and then connect, the pointer should be returned to ∞ position, it indicates that SCR good.

For the 1 ~ 6A Triacs, Hong Bi then T1 pole, black pen with simultaneous access by G, T2 pole, in ensuring that the black pen from the T2 does not disconnect G, under the premise of a very great, the pointer should be directed to a few dozen to more than 100 Europe (as the thyristor current size, manufacturers vary). And then 2 pen swap, repeat the above steps measuring time, a pointer directed but also slightly larger than the last time a dozen to a few dozen in Europe, indicates that the silicon well, and the trigger voltage (or current) small.

If the pole to keep connected to A or when the T2 pole disconnect G pole position of the pointer immediately returned ∞, then SCR trigger current is too large or damaged. According to Figure 2 ways to further measurements, for a one-way thyristor, closed switch K, lights should be shiny, disconnect K lamp is still not extinguished, or explain SCR damage.

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