OUR MUSEUM
Our museum is intended for those who are interested in the history of instrument making. It mainly houses samples of electrical measuring instruments from the 30s – 60s of the 20th century. Each of them is a scientific and technical achievement of its time. Time goes by quickly. New technologies and new measuring instruments appear. But in the history of instrument making there were such pages that everyone who develops and uses modern measuring instruments should know about. Instruments are written off, disassembled, documentation is lost and destroyed. Therefore, our task is to familiarize students and specialists with real samples of instruments as examples of the level of science and technology of the mid-20th century.
We will begin the tour of the museum with an acquaintance with an alternating current voltmeter of an electromagnetic system. The measurement limit is 130 V. The manufacturer is the Leningrad plant “Electroprylad”. The uniqueness of the instrument lies in the technology of its manufacture, for the most part it is handmade! The date of manufacture is not known for sure, but according to our indirect assessment, this is a pre-war device (before 1940).
The next veteran is a laboratory ammeter, DC with a magnetoelectric system mechanism. Measurement limits (with shunt) 0.3; 0.75; 1.5 A, accuracy class – 1. Manufactured in 1948 by the State Moscow Instrument Factory – DMEP. The device has a handle for carrying and a mirror scale to eliminate parallax.
The next veteran is a little younger than him – an ammeter of the EMM type (electromagnetic small? Or modernized?) measuring limit 75 A, accuracy class – 2.5, manufactured in 1949 by the same DMEP plant.
Next we see two panel-mounted devices, manufactured by the largest instrument-making plant ZIP (Krasnodar).
On the left – a DC voltmeter of the magnetoelectric system type M362, measurement limit – 15 V, accuracy class 1.5. Year of manufacture – 1959. On the right – an AC voltmeter of the electromagnetic system type EP2, measurement limit – 30 V, accuracy class 1.5. Year of manufacture – 1956.
The ZIP plant produced not only the most popular devices, but also universal ones for various measuring tasks. Among such devices, we present the combined device Ts315 – a popular tool for a tuner or radio amateur. 19 limits for measuring current, voltage and resistance. The ohmmeter of the device is powered by 3 elements FBS-0, 25. A good accuracy class on DC is 1.5 and 2.5 on AC. Our sample was manufactured in 1960 under the serial number 026 219.
The big “brother” of the tester-ampervoltmeter type “AVO-5M” is a multi-limit electrical measuring device, which is used to measure voltage and magnitude of alternating and direct current, as well as resistance measurement up to 30 megaohms. Along with peaceful use, it was part of the control and measuring devices of military radio equipment. Very reliable, although it has significant dimensions and weight. It was produced by the Omsk plant “Electroprylad”.
Another example of this plant is the AVN laboratory astatic voltmeter. With an accuracy class of 0.5, it provides measurement of alternating voltage in the ranges of 1.5; 3; 7.5 V. For reference: ASTATIC DEVICE, an electrical measuring instrument (ammeter, voltmeter, etc.), the measuring mechanism of which is designed in such a way that the position of the moving part (indicator readings) is not affected by an external uniform magnetic field. It is used mainly for precision measurements in direct and alternating current electrical circuits.
Year of manufacture – 1950.
A little younger than it is the LV-9 Tube Voltmeter, which is a multi-limit portable device designed to measure voltages with a frequency of 30 Hz to 200 kHz. The device is designed for use in laboratories, factory workshops and repair shops. It was manufactured at the Tallinn plant “Punane RET” in 1954.
High-frequency frequency meter 350-450 Hz type D145 – product of 1965 of the Leningrad plant “Vibrator”.
Also “special equipment” – a characteristic feature is a fluorescent scale.
Three additional devices – 2 shunts and a HENRY coil, dates of manufacture are unknown.
And finally – classic equal-shoulder cup laboratory scales. The year of manufacture, manufacturer and characteristics are unknown. However, based on the appearance and inventory inscription HETI, it can be judged that the age of this exhibit is over 50 years.
That’s all for now. We will continue to expand our exposition.
The tour of the Museum of Measuring Equipment was conducted by Associate Professor of the Department of Instrumentation and Measurement Technology Lysenko V.V.
See you soon!