ITTSB.EU Blog Forum
Electrical Test and Measurement instruments => Bench-top multimeter => Topic started by: Kiriakos GR on April 13, 2026, 03:13:01 PM
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TL2X4W-PTII (2mm tips / 1 meter cable length) (January 2007)
TL2X4W-PT7 (2mm tips / 2.13 meter (7-foot) cable length
TL2X4W-TWZ tweezers (April 2008)
All were discontinued by FLUKE at 5/2023.
We are now three years later, and 5/2026 this is not far.
What comes is the memory of death day = that is the opposite of birthday.
Long story in sort, what made these TL2X4W to be considered as so special?
I have gathered a few facts speaking of manufacturing details.
1) They are work of Pomona, and all three they has be recorded as of American origin.
2) They use gold plated 2mm tips = American Gold
3) They use RG-316 coaxial cable, this be silver plated
4) They use the patented double banana plug this having four contacts, and I assume a bit of American Gold over them too.
The sum is a mix of golden plated and silver plated copper.
TL2X4W-PTII this is a part code of the past.
But Pomona this keeps alive this product design, by the offering of two double banana at the end = an totally compatible product with every 4W bench top DMM.
While availability this is not a problem, it retail price this is a major problem. :P
For some time, I thought that such special leads, they might be of help of some one interested to measure SMD resistor shunts all day long.
And or for old fashion current shunt inspection.
Gentlemen I am somewhat confused, of what might be the though of these brands, at setting an price that no one accepts to pay.
Manufacturing cost = 2m long RG-316 along 5$ USD for everything else, this cannot justify an 180 EUR as retail price, at least on this planet.
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What is micro Ohm (u Ohm) resolution of 8846A ?
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The last digit this represents the quantity of 10 micro Ohm.
0.00001
0.00010 = 100 micro Ohm
0.00100 = 1000 micro Ohm (uΩ)
At 10 Ohms lowest range.
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Its time to find out the truth. ;)
Kiriakos made a gift to Kiriakos, for his upcoming birthday 10 of May.
A pair of TL2X4W-PTII this is on the way to Greece with SpeedPAK regular speed.
The journey begins today from Hong Kong.
TL2X4W-PTII bulk version this does not give you much options for unboxing. ;D
Product design of FLUKE Calibration
Country of Origin United States.
Fluke 2826215 , weight 131 grams (according to DHL shipped weight).
Anyway, I did set under my microscope any particle of information that I got due the photographs from my seller.
Enjoy the photographs gallery for now.
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Just for fun I did also check TL2X4W-PTII product revision history.
And I found three revisions.
First at 2006, black wires and a banana plug with shape of pyramid.
Second at 2007, black wires and new redesigned banana plug (TL2X4W-PT = 70 VDC Max).
Third at 2008, crystal clear wires, and again with the recently redesigned banana plug.
500 mA / 1000 VDC
Plus engraved text .. with product model
Since 2008, this final product, it was in production up to 2021.
Never touched before Pomona Electronics gold, but it will happen soon.
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Kiriakos made a gift to Kiriakos, for his upcoming birthday 10 of May.
You are a little devil after all ;)
I bet that eyes from Everett, WA, they do visit frequently this Blog.
Congratulations for been able to find this rarity down to Honk Kong, and at a friendly price. :)
Your 8846A will be very happy !
Plus your self will have another one educational journey at 4W Low Ohm resistance measurements, and a pack of fresh experiences.
True knowledge never comes for free. ;)
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The guys at Everett, WA, they skipped to offer an storage solution for TL2X4W-PTII :P
Either way, I did find a local source, to add in my list of possible choices. (3.5 EUR)
https://grobotronics.com/storage-box-plastic-with-foam-black-230x180x45mm.html (https://grobotronics.com/storage-box-plastic-with-foam-black-230x180x45mm.html)
Thanks mate :)
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Now lets make a first dive, at TL2X4W PTII actual electrical performance.
First customer feedback: robrenz on Feb 15, 2014 / tequipment.net
These probes only work with the fluke 8808A, 8845A and 8846A meters with the split jacks.
They are nicely constructed and work well.
They are kelvin connected meaning there is separate source and sense wires all the way except for the last bit of tip that sticks out of the probe body.
The combined resistance of that last solid part of both probe tips is about 400 to 500 micro Ohms.
This can be removed by using the relative function with the probe tips touching to null out that residual resistance.
Overall very nice to use with the single shielded 2 conductor cable per probe.
Test performed at 8846A
Second customer feedback: This is for TL2X4W-PT older with black wires.
Year 2024 at Australian Blog, one user measured and reported 520 micro Ohms.
0.00052 Ω
Test performed at 8846A
Third customer feedback: This will be Made in Greece. :)
I was never expect that this pair of tests leads this would be so extremely unpopular.
Entire internet this is empty of clues.
And about FLUKE offered product documentation, this is another bad joke.
TL2X4W-PTII manufacturing details
Probe body incorporates a two step mold process.
First step is Polypropylene for probe rigidity.
Second step is color gray Santoprene rubber for handling comfort, added insulation protection and wire strain relief.
(source: Pomona Electronics Copyright © 2012 / 5519A test leads PDF)
Santoprene = Thermoplastic elastomer (TPE).
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Now lets make a second dive, at TL2X4W PTII and of what actually this is.
This item represents the class of Kelvin Test and Kelvin Pins.
The strong point of Kelvin Pins this is measuring resistive components tolerances.
And or verifying at a small resistor it actual tolerance.
For example at one 10 mOhm shunt resistor, measurement tolerances have narrowed to the micro-ohm (µΩ) range.
And the 8846A, this indeed have the necessary display resolution so to present such measuring detail.
This Kelvin Pins rabbit hole, it goes even deeper, and down to IC packages inspection, surface mount soldering.
Fluke added much thought at the product design of 8845A/8846A, but they did leave outside the concept of automated comparator function.
Indeed by using an TL2X4W PTII, you do become fully capable to measure tolerances.
But its unavoidable of using a digital calculator, so to calculate tolerances percentage.
Since the moment that there is not any other bench-top DMM out there, this including an automated comparator function about automated percentage calculation, then there is no room for me so to complain. :)
Pass / Fail, comparator, this is another way of detecting if you are within tolerances preset.
But you do not know of how much off you are, when the measurement this is out of upper and lower limits boundaries.
Percentage calculation this it should be performed again manually.
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Here comes a third dive in to ultimate knowledge, this is the combination of all details that FLUKE leaved as undocumented. :P
The TL2X4W-PTII leads utilize a shielded cable construction.
This shielding protects the measurement signal from environmental interference in two distinct ways:
1. AC Voltage (ACV) and High-Frequency Noise
This is where the shielding does the heavy lifting.
In ACV measurements, especially at millivolt (mV) levels:
Capacitive Coupling Rejection: The shield shunts stray electric fields (like those from nearby fluorescent lights or power supplies) to ground before they can induce a voltage on the center conductor.
Logistical Edge: Unlike standard unshielded leads which act as antennas for 50/60 Hz hum, the shielded TL2X4W-PTII provides a cleaner signal path for precision low-level AC.
2. DC Voltage (DCV) and Low-Frequency Noise
For a 10V DC reference, the "noise immunity" shifts from blocking interference to managing thermal stability:
Thermal EMF (Seebeck Effect): At the mV and µV levels in DC, the primary "noise" is actually parasitic voltage generated by temperature differences across dissimilar metals.
The gold-plated Copper-Beryllium (CuBe) tips of the TL2X4W-PTII are designed to minimize this thermal EMF.
Triboelectric Rejection: Because the conductors are contained within a stable, shielded jacket, they are less prone to generating "motion noise" (triboelectric effect) compared to loose, swaying standard leads.
Summary of Benefits
Measurement Type Primary Benefit of TL2X4W-PTII
ACV (mV) Shielding rejects EMI/RFI and power line hum (50/60 Hz).
DCV (Ref) Low thermal EMF junctions and high-quality gold plating ensure stability.
Resistance True Kelvin 4-wire cancellation of lead resistance.
In short, while the shielding is technically an "AC benefit," the high-end material choice (gold-on-CuBe) makes them superior for ultra-stable DC as well.
Damn ... I have now to toss away the nickel plated bananas over my voltage reference. ;)
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So far I was speculate that TL2X4W PTII, this does not have any competitor.
I was wrong, Keithley Instruments, Inc. , this is also a shopper of identical test leads from Taiwan. ;D
At of 2016, they added this product code at their accessory list.
Model 5808 Single-Pin Kelvin Probes
https://www.tek.com/en/default-accessory-series-manual/model-5808-single-pin-kelvin-probes-instruction-sheet (https://www.tek.com/en/default-accessory-series-manual/model-5808-single-pin-kelvin-probes-instruction-sheet)
These are low volt 60VDC, 5A max.
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And the historical journey ends by a very rare find.
Pomona Electronics 6303 and or TL2X4W-PT Rev 1.0 8) (23 years ago)
RG-174/U
They begin by using naked bananas.
They have engraved company logo.
This product design was sort lived, as it was also and the FLUKE TL2X4W-PT.
And therefore FLUKE TL2X4W PTII as we know it, this it can be considered with out doubt as fourth revision.
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When AI join forces with Kiriakos Intelligence, the outcome it is a blast of rich and unique information's. 8)
Looking forwards to see and read your own evaluation.
Is this FLUKE TL2X4W PTII, an overpriced disappointment? Or something special?
The 8846A this is indeed special. :)
Otherwise Kiriakos would never accepts paying hard earned cash, so to buy these test leads.
I did a pricing check, Pomona, Fluke, Keithley, all similar offerings are still insanely overpriced.
They have not learn any lesson so far. :P
What their marketing manager's do ? Playing golf all day long?
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Here comes one last piece of information, when FLUKE this was bragging about the split banana design at 2006.
This is the only one ever presented, close-up image of this connector.
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Here comes one last piece of information, for FLUKE 8846A specifics.
FLUKE also succeed hiding the last page of FLUKE TL2X4W PTII datasheet, within 8846A calibration manual. :P
2X4 Test Lead Verification Steps
Additionally at 8846A User manual there is a relative screenshot.
Its now obvious, a bunch of losers was in control of these products documentation.
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8846A and electrical metrology related potentials.
No matter of how enthusiastic I might feel right now, 8846A this has documented electrical metrology related barriers.
10 Ohms lower range
5mA source current
Noise floor of 10% at 1 mOhm (DUT), this be lowest resistance value, which you can measure and trust the measurement.
And or, 8846A due in hardware limitations, this is measuring down to 1 mOhm resistor, and to confirm 10% tolerance limits at it best.
By measuring 1 mOhm resistor, digital display resolution this gets down to three digits.
From the other hand, 8845A and any DMM this having 100 Ohms as lower range, this is limited measuring down to 10 mOhm at 10% total uncertainty.
But when measuring a 10 mOhm resistor on the range of a Fluke 8846A, your total uncertainty this is 1%.
Knowing you measuring gear limits at component level repair, this helps limiting your expectations down to what its practically possible. :)
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Aside electrical metrology applications and limits, TL2X4W PTII test leads, this is an object this requiring to be adopted at your working style.
In the positive side of things, TL2X4W PTII this can serve in much more applications, in comparison to TL2X4W Tweezers, this having tremendously limited usability, at surface mount components.
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While my TL2X4W-PTII this has landed in Greece, it’s not here yet.
Even so my own focus this is now returning at this project.
My plan this is using this commercial product, as this to be a metrology class comparison point, as I assume, that TL2X4W-PTII this represents THE best Low Thermal (Low EMF) tests leads worldwide.
This has been designed and inspected by FLUKE Calibration in the USA, and they did use the 8846A as to be a DUT.
This pretested TL2X4W-PTII, due FLUKE metrology group, this as product design alone, it translates to me, that I will measure and discover, the lowest levels of 8846A ADC noise floor at 4W resistance mode.
By such information at hand, I would be able to perform side by side comparison, and performance verification of regular 4W harness with clips.
My very own DIY design of 4W harness with clips, this is constructed by extreme attention to detail.
It’s a shielded cable, with connection to ground, CANARE L-4E6S this is a Japanese engineering example.
Connection junctions made by real gold plated bananas, and by 99% true copper and solder.
While due mechanical performance alone, I did accept using no-name brass test clips.
CANARE L-4E6S Best cable for DMM Kelvin clips (DIY project). (https://www.ittsb.eu/CANARE_L-4E6S_Cable_Review.html)
Fluke 8846A / DMM 4050 and Special Pomona Kelvin probes 4W for mOhm resistance (https://www.ittsb.eu/forum/index.php?topic=2309.0)
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Few more particles of information, which I did discover these today, they was within few frames of video footage this released 13 years ago.
From a practical and also from a metrology point of view, this is an unnecessary test.
When you do buy this TL2X4W PTII, you need a tool, for a specific purpose.
Even test leads zeroing, this is performed by touching the leads tip to tip, and or over a PCB gold plated path, this used as SHORT bar.
While I do not care to criticize other people doings, these two heroes which leave a tiny bit of information as on-line feedback, they both did everything by the wrong way.
The first fellow, he was bolting TL2X4W PT tips, over a 50 years old can of a resistor standard.
The second fellow, he got TL2X4W PTII, when his actual needs was clips for measuring thru hole resistors.
The first fellow retiree calibration enthusiast, the second fellow a machinist.
All that we need is an carpenter, and then we can form a music band. ;D
None of them compatible with this tool serving purpose.
Now lets focus, at these images below, and lets track down, and count of how many mistakes they are demonstrated.
1) The Micro OHM-meter, this is ancient relic, this pushing 1A at 20 mOhm range, this is purely a tool for inspecting of telephone wires connection.
2) These tiny pincers, they can barely withstand 1A
3) The lower contact point this is unstable.
4) This FLUKE made warning, never stress the leads above 500mA, this got trashed too.
This is of why I keep the doors of ITTSB Blog locked, new born electricians and even youth, they need rock solid information this coming from qualifying sources.
What other people do within their garage as a hobby, this is not my business. :P
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Its time for us, to return back to our century. :)
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My TL2X4W PTII, this faced today it first mission in the field.
An medical system harness, this came today for repair.
After repairing the cable, I did confirm, at the active pair of gold plated contacts within the connector, that the electrode lead 1.5m long, this measures identically 20 mOhm at its one pin.
The customer leave with a smile, I am full of satisfaction along smiling, and got paid. 8)
The first peculiarity of TL2X4W PTII, you cannot take a photograph of your self while you are using them. ;D
The second peculiarity of TL2X4W PTII, the 8846A this is must be set manually at the 10 Ohm range.
Manual zeroing, then you may have a measurement.
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I cannot stop thinking of why FLUKE tossed in a nylon bag, these test leads.
Today I was determined to make the nicest and practical DIY home for my new test leads.
After testing several options, I ended up reusing an old IKEA plastic box organizer, 28x18x4.5cm
I did remove it orange organizer rack inside.
Then I did add black foam layer.
I did tweak original nylon bag, converted it in to nylon pocket, as storage compartment for the datasheet.
Then dual side sticky tape, the nylon pocket were clued over the black foam layer.
My goal was retaining as much memories possible, from this basic original packaging.
Everything else this is visible in the photographs bellow.
About usability, so far I was using exclusively TL175E test leads at my 8846A.
This new box, it is modified so to keep safe, TL175E and TL2X4W PTII.
I also like allot the white color, its impossible this box been misplaced, and to not see it right away on the bench. :)
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Does it really TL2X4W PTII this hides manufacturing secrets? ;)
While coaxial special cables its a pain to manage at handheld operations, they are not flexible, they get in the way between of your viewing field, the DUT and the DMM, they truly are superior than plain copper at 4W measurements.
This time I did explore test leads internal resistance.
FLUKE patented split terminal connector this is not made according to showcased 3D model (advertisement).
On its one 4mm hole, there is inside a plastic pin, and nothing is housed on top of it.
Instead they are two gold plated flat pads, they stay in place due to plastic molded housing.
These flat pads they come in touch with DMM banana inputs, directly at the beginning of metals pads these forming the 4mm barrel.
This manufacturing concept has as close example, the same way of contacts operation within electrically powered relay.
By inserting this connector over the DMM, you are becoming the mechanical force as you to were an active DC coil (electron magnetic force).
You cannot see or touch these miniature contacts within the connector.
This is bad news regarding human curiosity, but regarding product design, anything that humans cannot touch, this is safe regarding human error.
Electrically active length at TL2X4W PTII per lead, this is 1M + 40Cm.
Test leads Tip and down to connector contacts point.
Actual resistance measurement, this is another world wide record, and I will name this as supreme electrical conductivity. 8)
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Medical equipment repairs ?
Why not, they are also a pile of electronics after all. :)
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Japanese high precision resistance meter with Kelvin clips, this verifying build quality of Made in USA .. Kelvin test leads.
Only in Greece, and by Kiriakos hands, this it would be possible to happen. ;D 8)
Excellent presentation, lots of details, education + inspiration, and not boring !!
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;D Among everything else, and Free of Charge ...
In a few hours from now, I am celebrating my birthday. :)
56 years, 11 months, 29 days , I am getting 57 years old.
I am also counting 14 years, be close at electrical T&M industry due the ITTSB Blog.
And I also count and another three years engaging with electrical T&M topics before the ITTSB Blog.
I have devoted 17 years of my life so far, studying and practicing electrical T&M and metrology topics.
And all my life, I am an active field technician, and also engaging with electronic repairs.
In conclusion, I have today a huge in size skills pack, but this were developed because I never had a stable working environment.
Even so, I did stayed in my coarse been an electrician, no matter if am constantly facing financial challenges.
In personal level I feel complete, and proud for my progress in life.
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Kiriakos made a gift to Kiriakos, for his upcoming birthday 10 of May.
A pair of TL2X4W-PTII this is on the way to Greece with SpeedPAK regular speed.
The journey begins today from Hong Kong.
If I were FLUKE Corporation, I would offer you such a gift much sooner. ;D
One decade sooner at least.
Happy Birthday !!
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I have devoted 17 years of my life so far, studying and practicing electrical T&M and metrology topics.
Stubborn Greeks.... they do not gave up easy. ;D
Happy Birthday !!
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Thank you all for the incoming wishes and humor ;D
I am returning back at my active challenge, about exploring TL2X4W PTII product design and usability.
Prior getting in to writing down, my very own thoughts in the form of customer feedback, I thought to get in touch with FLUKE Corporation, so and I to find out if they have any information's which they never thought to share in public.
My very own list of Open questions:
a) Should we perform test leads Zeroing at TL2X4W PTII ?
b) Is there any tip of how us we might perform a PERFECT Zeroing at TL2X4W PTII ?
I never had challenge my self before that much, at trying to perform ideal Zeroing by using the conical tips of test leads.
With TL2X4W PTII test leads, the measurement of 20 Milli Ohm and higher this is EASY.
But if you think precision measurement down to 1 Milli Ohm, while its possible, its not easy to happen.
The unseen challenge, this is holding the leads properly (By using two hands), and at the same time, activating REL at 8846A.
This is a task for humans having tree hands. ???
And so I decided giving at Fluke Corporation a chance, for them to explain of what ever they skipped doing in writing.
I have start suspecting, the truth. :-\
TL2X4W-TWZ tweezers this had practical use from 0.5 Milli Ohm and higher.
TL2X4W-PTII this had practical use from 10 Milli Ohm and higher.
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I just received an great tip from the Japanese intelligence of 2008 (TEXIO), about resistance measurements.
To prevent noise interference to the test leads, use shielded cables for resistance measurements of 120kΩ or higher.
While the 8846A has resistance ranges, 10 Ω to 1 GΩ.
I have a very long time to measure large resistances, and I came close to forget the challenges at the upper ranges.
HH multimeter display this could be flickering, measurement can become unstable, regular test leads they become antennas, and even by our hands be near to measuring circuit (DMM), this causes some sort of influence.
From the other hand, FLUKE 8846A this is a shielded DMM, when this is paired with TL2X4W PTII, you may expect ultimate stability and repeatability up to the highest range of 1 GΩ.
Fluke Corporation past written marketing documentation, this mention easy going measurements at 100 Ohm and bellow.
While my self, I did focused my attention, of how much detail I can measure down to 1 Milli Ohm. As I have thought of this as the ultimate challenge for the DMM hardware and the test leads.
I do feel here as I to be an astronaut, alone in the moon with a pair of TL2X4W PTII in my hands, and no one else here so to talk about it.
For a first time I present in public view, one test lead accessory this totally missing from the market.
Its my own prototype in the form of combination.
This special design aloud TL2X4W PTII this getting connected over Resistor decade boxes along over voltage reference, helping at stable connection with the DUT. 8)
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After hours of testing, I am writing today the last page of this book. :)
8846A this has an excellent minimal noise floor, I have explore it several times, at voltage tests, but never that in-depth at resistance ranges.
Indeed TL2X4W PTII this is well designed tool, but not perfect enough so this to fool 8846A circuits. :)
Even quality Coaxial shielded, this can feel a soft bump and turn it to a spike, this easily gets recorded if you do data log.
When you move around TL2X4W PTII test leads, so to get them in place, you should do it with gentle moves, for keeping down interference generated by coaxial cables movement.
TL2X4W PTII it does create 400 Micro Ohm of loading.
After 2 hours of recorded data log, the average is 438 Micro Ohm.
Yes you can use TL2X4W PTII with out activating ZERO/REL but I cannot imagine the application, that I would use such special test leads for simply measuring 1 Ohm resistors or larger.
Indeed with out activating ZERO/REL , you have a working window from 1 ~ 10 Ohms
Indeed at larger quantities 10 Ohm + , TL2X4W PTII this will appear as invisible.
If you are up to dive at Milli Ohms, activating ZERO/REL this is a necessity.
And its a true pain in the ass, to coordinate the movement of your hands, and to activate REL/ZERO.
If you are after 1 Milli Ohm resistor (1% tolerance) evaluation, you will need a helper, him activating ZERO/REL over the DMM.
Zeroing TL2X4W PTII at the groove of the conical tips, this is easy to do, by one hand, while the other hand will push ZERO/REL button.
At this scenario the test leads they are ready to measure with detail, anything at 15 Milli Ohm and under.
Temco observations:
Fluke note ... if see 2000 micro Ohm of higher at Zeroing TL2X4W PTII? This is test leads damage. ???
At 23.5C TL2X4W PTII it does create 400 micro Ohm of loading
At 24C TL2X4W PTII it does create 440 micro Ohm of loading
At 25.2C TL2X4W PTII it does create 545 micro Ohm of loading
Temco this affects 8846A and test leads, now its clearly visible for its one added Celsius on top of 24C, there is 100 micro Ohm increase.
For example at 30C room temperature, micro Ohm loading it might become as high as 1000 micro Ohm, this equals to 1 Milli Ohm.
If I continue using examples, at 40C we might see 2000 micro Ohm, this equals to 2 Milli Ohm.
In real life, according to Greek weather standards, most of times 18C up to 28C indoor, micro Ohm loading this will always be lower than 1000 micro Ohm.
After joining together, seen and discovered by my self details, Fluke note this now makes sense. :)
In conclusion, TL2X4W PTII this does not deliver an easy workflow as they do the regular test leads.
This is a specialty tool, other than measuring resistors, this can get inside at narrow electrical connectors.
And you can perform 4W precision measurements, at narrow spaces that Kelvin clips they cannot get in.
This specialty tool, it can even assist at comparing multiple PCB traces to its other, and you can spot and verify if there is something wrong with them.
Now I get it too, as specialty tool, this could be found as useful, in a very small number of talented people, at PCB repairs.
I am happy that I did succeed getting one, its not the first specialty tool that I own. 8)
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Last thing that I did confirm, FLUKE TL2X4W PTII 4W performance as voltage REF wiring.
The new question is, of what is the worst that your neighbors can do, so those to damage your 10V REF data log? :P
TL2X4W-PTII a shielded fortress, 8846A another shielded fortress, 14 years old backed REF, and a few home appliances trying to sabotage my log.
Air-conditions, micro wave ovens, and who knows of what else.
It seems that my fortress this is holding well, lots of shielding here, by the FLUKE way. 8)
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Last thing that I did confirm, FLUKE TL2X4W PTII 4W performance as voltage REF wiring.
I think that you are teasing the world ;D
1H 30 Minutes log, if we subtract these five spikes, at the last digit of the million, they are only 8 digits play up.
I can only suspect, that you did crazy amount of improvements at this voltage REF, at the last rebuild at 2017 ;)
Excellent setup !! congratulations.
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Today I tested my TL2X4W-PTII in to another important application.
Modern home office wired phones, they get electrical power due our Internet router (Fiber/VDSL).
Speaker phone, and large display, all get powered by due our Internet router.
The cable connection due router phone line out, this now becomes crucial, because this now acts as power line for the phone.
6P2C for RJ11 single telephone line
6P4C for RJ14 two telephone lines
The usual length this is 1.5 meters, as extension cable.
I did measure today over ten similar extensions.
Only four was qualifying to be used, they were measured and found to be up to the specification.
While vast majority of used and even of unused cables, few found as poor performers due poor manufacturing.
And few others found as be plain trash.
TL2X4W-PTII this succeed making contact with telephone cable clip pins.
It was not that easy, TL2X4W-PTII conical tips these are not that sharp.
But I did succeed to test and throw away, all poor performing cables at 1.5 meters length.
My second test was testing a few handset dedicated spiral cables.
I did discover a few with significant quality control issues.
Tomorrow, I will inspect a few Five meters long extensions, and a few 10 meters long extensions.
And my workshop will be finally clean, as I will keep only top performing telephone cables.
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I think that you are teasing the world ;D
1H 30 Minutes log, if we subtract these five spikes, at the last digit of the million, they are only 8 digits play up.
I can only suspect, that you did crazy amount of improvements at this voltage REF, at the last rebuild at 2017 ;)
Excellent setup !! congratulations.
Yes I did significant improvements, these never shown in public.
My V-REF this is tweaked to retain five essential digits, from 15C up to 35C, for HH DMM verification.
8846A DCV CAL this is rock solid, does not need frequent inspection.