Ultra-High Precision resistor box
Here is an interesting story of how this Ultra-High Precision resistor box was made.
Last Christmas I did visited central post office so to get a parcel and after getting it, I did notice that at blue special Recycle Bin (outside of the building) it was two plastic boxes with interesting shape.
I did take them and I was holding them for a very special project.
When my seven dials decade resistance box project this were complete, I was end up having ten special resistors and at the same time I did not had a clear plan of how to use them, so them to be housed in a box and be connect in a way so this to qualify to be named as Ultra-High Precision resistor box.
Speaking of metallic connections points for its resistor in this project, I did not have enough cash flow so to order from USA some sort of exotic binding post banana, and my alternative this was me to research best alternative parts that I could order from eBay.
I did discover one type of speaker’s terminal this is 100% cooper and of large diameter, this has spring loaded top cover, and side hole this supposed to have diameter of 4mm as entry point for banana plug.
I did wait for 40 days (shipping time from China), and I got instead smaller in dimension terminals of identical type but them be 2mm at side holes.
For one week I was feeling desperate, and then I thought to use them in reverse way than of what I had originally thought.
Cooper axle this is made of real cooper and contacts resistance this is at 0.52 milliohm from side hole up to measuring point which Kelvin clips will be placed.
Now its resistor lead this is placed in to the side hole and spring loaded top cover this holds the resistor in place with sufficient mechanical force.
Axle length from side hole up to measuring point this is just one centimeter long.
Axle diameter at the point which holds resistor lead this is 7mm and narrow screw end this is 4mm.
In conclusion my new workaround and idea, in worst scenario it would add 1 milliohm of resistance in the measurement it self.
Next decision which I was had to make this is of how I am going to use the fancy plastic box so this to serve multiple goals.
1) Visibility of this finest Ultra-High Precision Hermetically Sealed Bulk Metal Foil Resistors.
2) Placement of its resistor in a way that factory product labels will be next to its resistor, so all information’s including production line information’s to be clearly visible.
3) Measuring points to be clear of abstracts’ and possibility of Kelvin clips harness this to cause mechanical damage to another measuring point this to be impossible.
4) Its resistor this to include guard shield connection with binding post.
5) Entire resistors box this to gain one storage solution this able to deliver significant protection when this valuable box this is not in use.
In conclusion after me solving all above puzzles I did move forwards to final assembly.
What I am now presenting with my pictures this is a true prototype, this worth named as Ultra-High precision resistors box this be 100% of Made in Greece Engineering.
Second personal breakthrough this is that all measuring values (calibration report), this is now pictured (photographed) instead be printed numbers.
Today with a big smile in my face I can say that these are my own parts of millions (resistance) in a box and I can touch them, see them and measure them.
Resistance meter loaded with Automation
The expression (saying): I will do it with my way.. this is invalid when your goal this is you becoming a friend of HIOKI RM3542A.
Basically HIOKI RM3542A this is unable to develop friendships, this is actually a machine this designed for fast accurate measurements’ when resistors are actually in production stage.
No one has humour when production errors occur, over all quality of production and this parameter alone it can close down a business because brand reputation will accepts severe damage when produced products are not delivered at requested specifications’.
Practically in the world of precision electronics manufacturing, major feeling in the atmosphere this is stress, elimination of anything that can go wrong this is first in line as principal (strategy).
HIOKI brand this is a manufacturer of test and measurement equipments that develop products for customers whom also manufacture precision electronics.
Therefore because HIOKI engineers them receiving feedback directly from the field (source) they were helped to focus at developing new product features them working as shield against factors that could go wrong.
1) Human error (measuring range or other selectable setting)
2) Test leads contact error
3) Test leads failure
4) Machine error (shelf check).
5) Machine error ( shelf calibration)
Primary Instruction for every NEW operator of HIOKI RM3542A this is that he must become first familiar with all automation that this is present and works as co-pilot this helping back the operator so he eliminates measuring errors.
HIOKI RM3542A this has different pack of features when this is used as standalone device than when this equipment become part of a bigger picture, for example at automated production line more than two meters they could compare their measurements’, and also measurements’ they can be constantly logged due a master control (PC) system.
RM3542A this is designed also for remote control due communication port. Slightest inconsistency of measured values this is a good reason for master alert.
Therefore and primarily HIOKI RM3542A this is designed to be best friend of other machines.
HIOKI EE corporation it did invest allot of thought so HIOKI RM3542A this to be also Human-User-Friendly equipment.
Actual feeling generated after using it this is admiration.
LCD display has a very acceptable size, comparator function this seems as gold addition because all information you need this is delivered to you right away.
Process of a single resistor measurement this is constantly monitored by the meter and included automation this is there to alert the user with specific messages when this is required.
In my case I gained my pack of experiences after of triple checking of 64 high precision resistors with it.
I did inspect all resistors at their arrival, then I did measure them again after them be soldered, and for a third time when my seven dials resistance decade box this was 100% finished project.
Total number of measurements’ which I did by using RM3542A this is now about 400.
Total of Measurements’ at precision resistors this 300 times, and I also explored milliohm measurements’ by inspecting quality of test leads and especially of binding post banana plugs and sockets, my forum this is full of presentations of such applications.
Major offering of RM3542A this is the feeling of total confidence, and repeatability this is exceptional.
RM3542A were tested (stressed) so this to verify resistance even at tolerance of 0.0025 %
LCD display at comparator function this can accepts (display) numeric input of four digits value as tolerance (Example: 0.002%).
RM3542A meter specification this is precision of 0.002 %.
The outcome of such ultra precision measurement this was spot on!
In summary RM3542A this was tested against a pile of high precision resistors and it did demonstrated rock solid performance and me I can hardly find the proper words so to describe my enthusiasm about it.
I am now convinced too that HIOKI RM3542A this is not a regular resistance meter (milliohm meter).
This is an impressive example of measuring equipment this serving as we speak in the production of electronics that we will use later on.
HIOKI RM3542A this is by far a more advanced measuring system, and there is a huge distance from it and of high quality bench top multimeter.
Ultra-High Precision resistors Box with Hermetically Sealed
Bulk Metal - Vishay Foil Resistors & HIOKI RM3542A product review
(Ultra-High Precision resistance meter - Made in Japan )
Written by Kiriakos Triantafillou - October 2017 ©