AIM 885A produces internally inconsistent results

Further to AIM 885 produces internally inconsistent results

A new release, AIM885A appeared recently.

In the common theme of one step forward, two steps backwards, this version produces error popups when started.

Screenshot - 15_04_2015 , 17_41_08

The above popup appears twice when starting AIM885A. Just another symptom to undermine confidence in the system. It doesn’t make sense to me, and the program appears to otherwise start and run.

This problem would seem to some extent to be caused by the lack of a professional Windows installation package that facilitates ordered upgrade from one version to another.

It still exhibits the defects commented upon at AIM 885 produces internally inconsistent results.

Update 23/04/2015: On his forum, the developer advises I’m sorry but version 885A has some problems. I’m working an update. In the meantime use the mature version AIM_865A. In my tests, AIM_865A is seriously flawed (AIM 865A produces inconsistent / incorrect results and several other articles) so it is not really a solution.

Accuracy of AIMuhf system – AIM865A vs AIM882 vs AIM885 on a ferrite cored inductor

This article builds on Accuracy of AIMuhf system – AIM865A vs AIM882 on a ferrite cored inductor by adding a measurement using AIM885 of the same test inductor.

 

Inductor1

Above is the test inductor. It comprises 6 turns of 0.5mm PVC insulated wire wound on a BN-43-202 binocular balun core. Continue reading Accuracy of AIMuhf system – AIM865A vs AIM882 vs AIM885 on a ferrite cored inductor

A new impedance calculator for RF inductors on ferrite cores

Some time ago I published a calculator for estimating the impedance of RF inductors on toroidal ferrite cores (Calculate ferrite cored inductor).

Screenshot - 23_02_2015 , 08_09_25

The calculator (input form above) use the core dimensions and complex permeability as the basis for calculation.

There are some popular cores that are not simple toroids and so not suitable for direct use with that calculator. For these cores, a practical method is to measure the inductance constant Al (inductance of 1 turn in nH) at low frequency (where µ=µi), and using the µ’,µ” characteristic from the datasheets, to calculate the impedance at the desired frequency. Note that µ’,µ” are usually frequency dependent for ferrite materials. Continue reading A new impedance calculator for RF inductors on ferrite cores

Speaker wire is so popular as an RF transmission line

I received a sample of speaker wire from a correspondent who asked me to characterise it.

Even if I had the time, a 50mm sample isn’t sufficient to characterise in a meaningful way… but let’s have an abbreviated look which will highlight the pitfalls of this stuff.

SpeakerMicrometer

First thing to do is measure the conductors, stranding and diameter. There are 14 strands and several measurements fall just below 0.15mm diameter. This is probably nominal 0.15mm with new drawing dies which are a little undersize. Continue reading Speaker wire is so popular as an RF transmission line

Accuracy of AIMuhf system – AIM865A vs AIM882 on a ferrite cored inductor

In other posts, I have commented on the apparent inconsistency of AIMuhf measurements.

One of the devices I often wish to measure is a ferrite cored choke such as those used for a Guanella 1:1 balun. A small test inductor was made to provide a common device for measurement across instruments, and versions of software, though small, it has similar characteristics to the larger inductors more commonly measured.

Inductor1

Above is the test inductor. It comprises 6 turns of 0.5mm PVC insulated wire wound on a BN-43-202 binocular balun core. Continue reading Accuracy of AIMuhf system – AIM865A vs AIM882 on a ferrite cored inductor

Slot-it CA20A rework

The Slot.it CA20A is a sidewinder configuration with the Mabucci style MF08 motor with extended shaft at both ends. The shaft ends extend out to about the mid point on the rear tyres with about 1.5mm clearance to the tyre.

The supplied PT32 tyres are quite elastic, and fly off the rim at high speed, making contact with the extended motor shaft and gouge the tyre, not to mention slowing the car. Continue reading Slot-it CA20A rework