DC Hipots can be used for the following testing applications: cable, transformers, electrical switchgear, terminations, motors generators and other electrical apparatus.
Today we’re going to take you behind-the-scenes to do a live test with our 800PL series Portable DC Hipot Testers. Here at HAEFELY HIPOTRONICS we always stress the importance of safety. So be sure to check with your own company’s guidelines for personal protective equipment.
This unit is our 880PL DC Hipot tester. It’s capable of putting out 80kV at 10mA. Other models in the 800 series follow a similar testing procedure, but today I’m demonstrate testing on a 15kV-rated URD cable.
While the power is off, connect ac power supply to the unit and 120V/60Hz power strip. Also, connect high voltage, ground, and return leads. Then connect the other ends of your leads back to your unit. Also, be sure your interlock plug is connected.
Now it’s time to make sure that all nonessential personnel are out of the testing area so you can begin your test. Set your current range to max, and set your voltage range to the desired setting. My cable is only rated for 15kV, so I’m going to use the lowest 0-20kV setting. Make sure your voltage control is lowered all the way to zero. Turn on the ac power switch, and this beacon here will light up to indicate there is power to the unit.
From a safe position, turn on your high voltage. This beacon will light red indicating that you are ready to start your test.Slowly raise your voltage to the desired setting. For me, that’s going to be about 13kv. You can hold your voltage for as long as your test specifies.
Now that the voltage is holding on my device under test, I’m going to check the leakage current on the current meter.
Right now the current meter range is 0-10 ma. As you can see, the current is nowhere near 1 milliamp, so I’m going to adjust the current range to go into microamps. As you can see, we’ve got about 4 microamps of leakage current. Now I’m going to return my current meter to the 0-10 milliamp setting.
Our test has run long enough, so I’m going to go ahead and slowly lower my voltage back down. I’m going to turn my high voltage off, and my ac power off. It’s important to make sure your unit is properly grounded, so I’m going to use a grounding stick. Now you’re ready to disconnect your specimen…and pack up the 880 for another test.
Call our Sales Department at 845.230.9245.
Request a free quote anytime online.
Learn more at www.hipotronics.com.
Read our 800 Series Datasheet.
Get accessories: email@example.com.
HAEFELY HIPOTRONICS has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.
Internet of Things PCB ways to care for Startups
As IoT appliances are so innovative, you would assume that getting an IoT printed circuit board (PCB) project off the ground starts by reinventing the wheel and finding your way through a number of technical problem. That may be false.
However it doesn’t mean IoT startups have a very clear way to stardom. Facing them is a number of design and manufacturing points that are completely unique to these small products. These points ought to be taken into consideration for the fresh IoT product to achieve success.
On the plus side, it’s important for IoT startups to recognize that the foundation for a successful new product exists. This simply means experience and knowhow concerning the design, fabrication and assembly of these cutting-edge products are accessible. Also, the best advice is for prudent IoT product enterprisers and leaders to follow the recommendations that veteran electronics manufacturing services or EMS vendors provide. These corporations along with their engineering staffs have executed the work with revolutionary IoT firms in Silicon Valley stepping into the very first of this appearing industry.
The PCB of an IoT unit is a special beast than the traditional one, which is notably larger and flat. IoT devices, in comparison, are made up mostly of either rigid-flex or flex circuit assemblies, which come with their own groups of design layout, fabrication and assembly points and detailed aspects.
A key factor is to search out skilled designers who have completed numerous rigid-flex PCB designs. PCB space for an IoT unit is confined. So you want the designer to have direct layout practical experience to productively design crucial components on that compact area.
Furthermore, nearly all IoT systems aren’t fixed; they obtain sizeable movement and twisting. Here, the skilled designer plays an important role in computing bend ratios and lifecycle iterations as a significant part of a design. Other crucial design layout points involve signal trace thickness, number of rigid and flex circuit layers, copper weight and stiffener placement. Stiffeners are utilized on flex circuits to ensure that components placed on the flex circuit keep on being firmly constantly in place to stop movement.
An alternate aspect to consider is through-hole part positioning in rigid-flex circuits. How come is that vital? Most IoT devices are founded upon surface mount device placement. Nevertheless , there may be through-hole components, which are in most cases designed into either the rigid part or the flex portion of the board. Through-hole components are often utilized to connect input/output or I/O signals to the exterior world. Doing this, those signals can show up using an LCD or LED monitor. Through-hole part placement is a critical account in an IoT device given that when applied to the flex part of the board, suitable stiffeners have to be designed and employed for proper assembly.
Last but not least in the layout category, the heat that components generate is required to be thought of. IoT systems are starting to be challenging with rigid-flex and flex circuits featuring more than 12 – 14 layers. A few systems are digital. Nevertheless , ever more analog units are being used in IoT units. Analog circuitry stimulates way more heat than digital ones. It indicates heat expansion and then contraction rate must be thought of. In tech lingo, it is referred to as the Coefficient of Thermal Expansion or CTE and the right handling of it.
Finding the right fabricator is significant and is linked to the EMS company you’ve determined. The fabricator you would like has to have IoT PCB fabrication experience. Among crucial points here are ensuring tough adhesions between layers on both rigid and flex circuit sides, comprehending all of the significant calculations and possessing a strong comprehension of when current transfers from the rigid side to the flex side.
Such fabricators must also possess an in-depth know-how about extremely little parts like 0201 as well as 00105 device packages, package-on-package, and the employment of fine-pitch ball-grid array or BGA packaged devices.
They also must have expertise in designing boards with very tight tolerances in terms of footprint for those types of BGA devices, in terms of up-to-date capabilities like laser direct imaging for putting the solder mask on the board. They must have laser drills for via drilling with sizes of 5 mils or under because these IoT products could be so small that a standard drill size of 5 to 8 mils may not be sufficient. They might ought to go to a 3 mil, meaning that you need to have an innovative laser drilling capability in house.
In the event that you’re placing via-in-pad, it’s a fantastic way to take advantage of the small space that’s available on the rigid-flex board, yet it presents problems for assembly. If vias are not 100 % planar or flat in shape, it will be difficult during the assembly of those tiny BGA packaged devices. That’s because non-planar surfaces can easily endanger the integrity of solder joints.
In some cases via in pads leave bumps in the event they’re not cleaned thoroughly after positioning the vias and gold finish at the top. In the event there are bumps, then the solder joints in the assembly for those tiny BGA balls in those IoT devices may not be a great joint. This might create spotty connections, which can be a bigger issue to handle and remedy. It all boils down to which EMS company you’re using because they’re the ones who will pick the fabrication factory to make a thriving IoT item for you.
It’s essential to look at skilled EMS companies that have successfully assembled IoT and wearable PCBs because they have special tooling and fixtures already existing, which are vital for assembly to ensure that components are placed effectively, precisely and the printing is conducted in the right way.
Printing may be a challenge for IoT units. If it’s a rigid-flex board, then you can find a difference between thicknesses of the rigid and flex circuit portions, indicating a special fixture is required to maintain the complete rigid-flex board planar or absolutely flat to make effective printing to be accomplished.
Startups have to be all set to decide on the proper manufacturing partners and EMS firms. In this way they can make sure they have got sufficient experience before hand to get the multitude of design, fabrication and assembly details successfully performed because they are crucial to a lucrative and prompt IoT product roll-out.