en:navody
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en:navody [2019/01/29 16:18] – [Voltage higher than +5V] fluktuacia | en:navody [2019/01/31 14:11] – [Tower arrangement] fluktuacia | ||
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=== Symmetrical power supply === | === Symmetrical power supply === | ||
- | This kind of power supply, conventionally +12V and -12V, is used in analogue constructions, | + | This kind of power supply, conventionally +12V and -12V, is used in analogue constructions, |
{{: | {{: | ||
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=== Very high voltage power supply === | === Very high voltage power supply === | ||
- | It includes power voltage in range of hundreds volts to ones of kV. Such powering is used for certain special detectors or gas discharge lamps, LASERs, etc. It is distributed via a coaxial cable with SHV or MHV connectors. | + | It includes power voltage in range of hundreds |
==== High-frequency signals ==== | ==== High-frequency signals ==== | ||
=== Asymmetrical signals === | === Asymmetrical signals === | ||
- | Analogue VF signals are distributed in MLAB via a classic VF Pigtail usually made form coax RG-174 with both ends having a screw-type SMA (Male) connector. | + | Analogue VF signals are distributed in MLAB via a classic VF Pigtail usually made from coax RG-174 with both ends having a screw-type SMA (Male) connector. |
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==== Digital buses ==== | ==== Digital buses ==== | ||
- | Digital buses, such as I2C, TWI or 1-wire are distributed between the modules via standard cables, usually only adjusted so that one plastic ending contains all the bus’s wires, | + | Digital buses, such as I2C, TWI or 1-wire are distributed between the modules via standard cables, usually only adjusted so that one plastic ending contains all the bus’s wires, |
===== Maintenance and cleaning ===== | ===== Maintenance and cleaning ===== | ||
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==== Interconnecting cables ==== | ==== Interconnecting cables ==== | ||
- | Due to a gradual wear by a mechanical switching, the interconnecting cables’ connectors loose their conductivity. It last several hundreds of connections and re-connections until the phenomenon occurs, but it might be speeded up by careless transport of already connected constructions, | + | Due to a gradual wear by a mechanical switching, the interconnecting cables’ connectors loose their conductivity. It lasts several hundreds of connections and re-connections until the phenomenon occurs, but it might be speeded up by a careless transport of already connected constructions, |
- | The above-mentioned state can be repaired by | + | The above-mentioned state can be repaired by napružení kontaktu konektoru |
- | + | ||
- | U propojovacích kablíků se v důsledku jejich postupného opotřebení mechanickým přepojováním snižuje vodivost jejich konektorů. Trvá řádově několik stovek zapojení, než se tento jev projeví, ale může být urychlen například neopatrnou přepravou zapojených konstrukcí, | + | |
- | + | ||
- | Tento stav lze napravit opětovným napružením kontaktu konektoru šroubovákem, nebo jiným podobným nástrojem. To se provádí zvenku u zámku konektoru. tlakem na pružinku proti stolu. | + | |
==== Modules ==== | ==== Modules ==== | ||
- | Most of the modules | + | Most of the modules |
<WRAP info> It is not possible to use electrostatic duster for a dust removal as it might cause a destruction of certain electronic circuits in modules </ | <WRAP info> It is not possible to use electrostatic duster for a dust removal as it might cause a destruction of certain electronic circuits in modules </ | ||
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=== Screw terminal === | === Screw terminal === | ||
- | There are two widespread | + | There are two widespread |
The first type is more common mostly due to its low price. However, thanks to using a sheet metal washer under screws, it is not possible to fasten a naked wire of small diameter well into this type of screw terminal. Furthermore, | The first type is more common mostly due to its low price. However, thanks to using a sheet metal washer under screws, it is not possible to fasten a naked wire of small diameter well into this type of screw terminal. Furthermore, | ||
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=== Spring terminal block === | === Spring terminal block === | ||
- | Spring terminal block are an excellent modern substitute for screw terminals, which are slowly becoming technically obsolete. Their disadvantage, | + | Spring terminal block are an excellent modern substitute for screw terminals, which are slowly becoming technically obsolete. Their disadvantage, |
One of the commonly used spring terminal block is WAGO256. | One of the commonly used spring terminal block is WAGO256. | ||
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==== High-frequency signals ==== | ==== High-frequency signals ==== | ||
- | High-frequency signals are led to external devices in the same way as they are between modules - via coaxial | + | High-frequency signals are led to external devices in the same way as they are between modules - via coaxial |
In order to connect distant devices, such as receiving antenna, F-connector is a good choice, mainly thanks to its easy assembly and disassembly, | In order to connect distant devices, such as receiving antenna, F-connector is a good choice, mainly thanks to its easy assembly and disassembly, | ||
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=== USB === | === USB === | ||
- | The most widely | + | The most widely |
{{: | {{: | ||
- | Using an USB connector on a module requires placing a current fuse into the charing from USB (usually 750mA PTC). Otherwise a short circuit can cause a fall of HOST system and thus a data loss (of a tuned program). | + | Using a USB connector on a module requires placing a current fuse into the charing from USB (usually 750mA PTC). Otherwise a short circuit can cause a fall of HOST system and thus a data loss (of a tuned program). |
=== RS-232 === | === RS-232 === | ||
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=== RS-485 === | === RS-485 === | ||
- | In industry, this bus is used with terminal blocks. Therefore it is suitable | + | In industry, this bus is used with terminal blocks. Therefore it is practical |
=== CAN === | === CAN === | ||
- | To distribute CAN bus over longer | + | To distribute CAN bus over longer |
===== Test constructions ===== | ===== Test constructions ===== | ||
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==== Measuring arrangement ==== | ==== Measuring arrangement ==== | ||
- | The following way of assembly, when we use úhelníky (??), for example form Merkur building kit, in order to attach the corner screws, has an advantage in that you can access both sides of the board without any problems and carry out measurements also on a PCB. It is thus suitable for revive | + | The following way of assembly, when we use úhelníky (??), for example form Merkur building kit, in order to attach the corner screws, has an advantage in that you can access both sides of the board without any problems and carry out measurements also on a PCB. It is thus suitable for reviving |
{{: | {{: | ||
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==== Tower arrangement ==== | ==== Tower arrangement ==== | ||
- | Metal MLAB mounts can be stack on onto another using threaded rods. Such arrangement saves space and enables a construction of a more complicated and extensive | + | Metal MLAB mounts can be stack on onto another using threaded rods. Such arrangement saves space and enables a construction of more complicated and large-scale |
{{: | {{: | ||
- | The threaded rods used in the example are of M5 type and each board is fastened by a nut from above and below. There are washer | + | The threaded rods used in the example are of M5 type and each board is fastened by a nut from above and below. There are washers |
===== Permanent installations ===== | ===== Permanent installations ===== |
en/navody.txt · Last modified: 2023/01/15 12:59 by 94.112.192.193