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Frequency Standards

Devices that produce a known frequency.

See Also: Hydrogen Frequency Standards, Rubidium Standards, GPS Clocks


Showing results: 481 - 482 of 482 items found.

  • Climatic Chamber

    Wewon Environmental Chambers Co, Ltd.

    Climatic chamber is designed to do high temperature & high humidity, high and low temperature, or temperature cycling test, Climatic chamber mainly used for quality checking and assessing their quality reliability and life test. ● The climatic chamber simulate a full range of temperature testing and humidity testing conditions.These chambers are designed for ease-of-use, reliability and performance and include many user-friendly features standard with your purchase for the best value in the industry. ● Climatic test chambers are able to provide rapid product temperature change rates and use varying levels of relative humidity to locate design problems prior to shipping your products, improving product quality and reliability. climatic chamber For conditioning of samples prior to testing. Climatic chamber also can be used for a variety of materials of high – low temperature alternating test. The test temperature, humidity, time can be programmed. Provides conditions of temperature form -70 degree to +150 degree and of humidity from 20% to 98%. ● This type climatic chamber use 16bit Industry-grade PLC, programmable controller to control the test temperature test, and recycle time, more excellent anti jamming, high reliability of the data. ● TEMI880 large color LCD touched screen temperature & humidity controller. Real-time display program running time, the number of segment, the remaining time, repeat frequency,can display experimental data, including the pre-set segment time, heating status, calendar time, etc; climatic chamber directly digital display. ● Climatic chambers apply controllable silicon step-less adjusting technology to adjust temperature and humidity test continuously and precisely, and without over heated as the PID adjusting function. ● The thermal insulation material between outside and inside for climatic chamber is high-quality ultra-fine glass fiber insulation cotton, good thermal insulation effectivity. Thermal insulation layer composed of flame fire PU + glass wool insulation (insulation thickness 10.0 cm)

  • 40kw High Efficiency AC/DC Power Supply Charger 100-750VDC Charging Rectifier 100A Battery Charger

    SD750100G - Zhejiang Sandi Electric Co., Ltd

    40kw High Efficiency AC/DC Power Supply Charger 100-750VDC Charging Rectifier 100A Battery Charger is for DC battery system charging station. With three-phase non neutral conductor AC input, it has the advantages of high efficiency, high power density and low harmonic. 50-500Vdc output voltage range optional, suitable for all types of batteries.FeaturesProduct Introduction:SAND AC/DC Charger is specially developed for DC chargers module. It has high efficiency, high power factor, high power density, high reliability advantage. AC input 3 phase or single phase, DC output voltage range from 100 to 750VDC can be set, compliant with CE safety requirements, EMC standard EN61000-6-3 and EN61000-6-1 Class A, it is an advanced international level charger module.Unique function:● High efficiency over the full load range, full load efficiency greater than 95.5%● Wide output voltage range, 100-750VDC, suitable for a wide range of Lithium and lead acid battery● 5-inch LCD touch screen, easy to operate● Flexible application, charging voltage, charging current, charging time, timing charging can be set by LCD screen, easy to operateMain features:● Powerful protection, overheating, short circuit, overload, overvoltage, undervoltage, etc.● Three phase active power factor correction technology, reduces the harmonic interference to the grid● Dual DSP design, achieve the full digital control, less components means high reliability● Wide input voltage range, allows operation in most poor grid conditions● Soft start charging and soft shutdown minimize the impact on the battery.● Input, output have protective circuit breaker switch● Module adopts hot pluggable design, which is convenient for maintenance.● CAN/RS485 interface (Optional)SpecificationModel SD750100GAC input Input system Three phases + PEVoltage range 280Vac ~500VacRated voltage 440VacFrequency range 50Hz/60HzMaximum current <74AITHD (total harmonic distortion) <5%DC output Output power 40KWVoltage range 50-750Vdc ( can set)Constant power output voltage range 400Vdc-750VdcOutput current range (A) 100A ( 1~100A can set)Output current limit 1-100A continuously adjustableSteady voltage precision <±0.5%Steady current precision ≤±1% (rated range of 20% ~ 100% for output load)Load regulation rate ≤±0.5%Startup overshoot ≤±3%Peak-to-peak value noise ≤1% (200~1000V, 0~20MHz)Display Indication Light Green LED: normal operation,Yellow LED: alarm, Red LED: failureDisplay language EnglishDisplay 5’ LCD touch screenPower factor and THD Power factor ≥0.90 Full-load output power of @20%~50%≥0.98 Full-load output power of @50%~100%≥0.99 Full-load output power, input nominal voltage and frequency of @100%THD ≤5% Full-load output power of @50%~100%Protection function input overvoltage Protection Over Under Voltage automatic shutdown and restart when voltage return normalOutput overvoltage protection Over Under Voltage automatic shutdown and restart when voltage return normalOver-temperature protection Automatic shutdown. Automatic restart when the temperature return to normalShort circuit protection Automatic shutdown and lock, need power off to restart to unlockEfficiency Under Rated input voltage ≥95.2%

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