Windows are optical glass with ground and polished faces that are relatively parallel.They are used to isolate two physical environments while allowing light to pass.Windows made of BK7 material have high transmission in the visible spectral region, do not scratch easily, do not degrade under normal operating environment and hence do not need any special precaution or treatment. Anti-Reflective Coating will provide higher transmission.
Specification of our optical windows as follow: Round Optical Window,Optical Infrared Window,Optical Square Window,Irregular Window,Optical Flat Window China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com
Table 1 Insulation resistance Measured value Megohmmeter voltage 500V1000V2500V
Test result 480MΩ14MΩ95MΩ
It can be seen from Table 1 that the insulation resistance value of the test object decreases as the megohm voltage used increases. This situation can easily cause misunderstandings by electrical maintenance personnel. For this reason, for the test subject with doubtful insulation resistance, a megohmmeter with a correspondingly high output voltage is particularly applied to high-voltage electrical equipment to facilitate the exposure of insulation defects.
In order to solve the problem of lower output voltage of digital megohmmeter, we can use two 1000V or 500V megohmmeters in series. According to the principle of series voltage superposition, using two 1000-volt and 500-volt megohmmeters in series, a 2,500-volt DC voltage can be obtained on the test object. But when using it, you should pay attention to two points:
(1) The ground potential of the first megohmmeter has been raised. Therefore, the megohmmeter housing should be insulated from the ground. Operators should wear gloves and other safety measures.
(2) The megohmmeters used in series are produced by the same manufacturer as much as possible, and the characteristics are generally the same.
Dear Customer:
Thank you for your attention to our products. In addition to this product introduction, the company also has insulation ladders, high-voltage insulation mats, cable fault testers, high-voltage measuring instruments, insulation boots gloves pressure test equipment, power safety equipment cabinets, etc. Introduction, if you are interested in our products, welcome to inquire. Thank you!
When selecting windows, you should consider the following: material,transmission,scattering,wave front distortion,parallelism and resistance to certain environment.
China Star Optics offers all types of windows made from different materials.Special size and materials are also available upon request.In addition, we provide a variety of single layer or multiplayer anti-reflecting coating on Optical Windows.
*Material: BK7,UV-grade fused silica (JGS1) or other optical crystals materials
*Length tolerance:+/-0.01
*Width tolerance:+/-0.01
*Center thickness tolerance:0.005mm
*Surface quality:80-50 to 10-5 Scratch/Dig
*Surface flatness:<lambda to lambda/20
*Parallelism<=1min -- 2sec
*Clear Apenture:80% -- 100%
Manufacturers explain the use of megohm meters in series
Manufacturers explain the series use of megohmmeters Digital megohmmeters (also known as shaketables) are commonly used instruments to measure the dielectric strength of electrical equipment. However, in rural areas or in remote and backward areas, there are generally only 500V or 1000V megohmmeters. When measuring the insulation of high-voltage electrical equipment, it is often felt that the output voltage of the megohmmeter is insufficient, and the sensitivity is low. The purpose of partial insulation defects. Because sometimes measured with a 500-volt Megohmmeter, the insulation value of the test product has a high resistance value, and the insulation resistance value measured with a 2500-volt megohmmeter is so low that it cannot be used. Insulation is relative. The basic insulator is insulated from low voltage, but it is not necessarily insulated from high voltage. Therefore, the insulation resistance measured with different voltage megohmmeters is different. For example, when a defective test piece is used to measure the insulation resistance of a test piece using a megohmmeter of different levels at the same ambient temperature, the test results are shown in Table 1.