Network ammeter to LATR. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Those who have been involved in the development, adjustment and repair of RES know for sure how convenient it is to use a laboratory autotransformer (LATR).
I use a nine amp LATR [1]. For ease of use, I supplemented the LATR with an alternating current ammeter. Its circuit diagram is shown in Fig. 1, and the printed circuit board is shown in Fig. 2.
(click to enlarge)
The design of the ammeter is good in that it has one scale for three ranges, it is linear and no inscriptions or graduations are required on the main scale of the microammeter. As a current sensor, one low-resistance powerful manganin resistor (0,024 Ohm) is used, which ensures ease of switching and no power loss (in the form of a voltage drop across resistor R1).
On circuit elements VD9, R9, C4, C5, VD10 and relay K1, a time delay device for connecting the microammeter head to the diode bridge VD5 - VD8 is assembled. This ensures that the microammeter needle does not go off scale during the charging of the capacitor C1 (the moment the LATR is connected to the network). The elements of the delay circuit are assembled on a separate fiberglass plate and connected by mounting conductors.
The types of radio components used are not critical, using a microammeter, for example, 50 μA, the resistance of resistors R2 - R4 will have to be increased.
During adjustment, in parallel with these resistors, trimming resistors with a rating of 470 ohms should be connected; 4,7 kOhm; 47 kOhm respectively.
The inclusion of the scheme of Fig.1 in the general scheme is shown in Fig.3.
The circuit has been working for many years and is very convenient in that it has three ranges: this allows you to control the no-load current from low-power to very powerful transformers.
References:
- Zyzyuk A.G. About transformers//Radioamator.- 1998.- No. 2.S.38.
Author: A.G. Zyzyuk
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