Products > Test Equipment
Weller WTCP-51 solder station and TCP-S pencil not working
Faringdon:
Hi,
it may be earthed, but still not suitbale for ESD operation ... because the ESD current is not limited.
So in case you use this tool to work on an ESD_charged_PCB there will be a spark with non limited current.
Suitable ESD tools should provide a minimum impedance to EARTH GND.
This means high ohmic to limit the current but still to dissipate the ESD energy, but also low capacitance to EARTH GND to avoid high capacitive peak currents.
Ian.M:
Here's a low effort reply for a low effort troll!
--- Quote from: Faringdon on June 25, 2024, 06:59:44 am ---Hi,
it may be earthed, but still not suitbale for ESD operation ... because the ESD current is not limited.
So in case you use this tool to work on an ESD_charged_PCB there will be a spark with non limited current.
Suitable ESD tools should provide a minimum impedance to EARTH GND.
This means high ohmic to limit the current but still to dissipate the ESD energy, but also low capacitance to EARTH GND to avoid high capacitive peak currents.
--- End quote ---
Are you telling us that NASA is wrong* or that NASA doesn't care about ESD? :palm: :-DD
* Ref: NASA-STD-8739.3, section 6.4.3 (page 30):
--- Quote ---6.4 Tool and Equipment Control
...
3. Power tools used during the soldering process shall comply to the tool requirements herein and have a three-wire grounded power cord. The area making contact with the workpiece shall be grounded. When measured from the workpiece contact point to ground, the resistance shall not exceed 2.0 ohms and the potential difference shall not exceed 2 millivolts root mean squared (RMS) using methods indicated in the supplier's engineering documentation.
--- End quote ---
Faringdon:
Thanks, NASA says that a solder tip should be directly connected to earth ground?...with none of the typical 1MEG "ESD resistance"?
I control F'd your kindly supplied doc for "ESD", but didnt see where it says that?
Is there a 1MEG inside the tip?, from the workpiece point, to the tip?
tggzzz:
--- Quote from: Ian.M on June 25, 2024, 06:30:45 am ---Faringdon, you are a troll. You are also so incompetent at basic research that you could not pour piss out of a boot with instructions on the sole!
--- End quote ---
When there are multiple similar failures, it is standard practice to note the factors to see if there is a common cause. That common factor can then be examined to see if it is the cause, and cured/removed/avoided as appropriate. For example:
faulty: Faringdon + Weller WTCP-51 + TCP-S
faulty: Faringdon + Weller WD1 + WP80
faulty: Faringdon + soldering joints with >10 year old flux
Conclusion(s) are left as an exercise for the student.
Gyro:
--- Quote from: Faringdon on June 25, 2024, 05:21:04 am ---Hi,
The magnastat temperature control system sounds terrible in terms of ESD.
I mean, the tip must be earthed for ESD protectivity reasons.
But a tip that is loose when it "flicks up" away from the heater, "magnastat style", cannot be earthed.
As such, I am surprised such a system exists.
Clearly , with any solder iron, the tip should be continuously connected to an earthed heater structure.
Do you confirm that the tips of magnastat are not earthed, indeed, cannot be realistically earthed?
The top post here seems to confirm that its not ESD safe.
Surely, such an "instrument of doom" should have like an ESD "skull & cross bones" on it, clearly visible.
A soldering iron without ESD safety is like a dishwasher that smashes the plates!
I mean, this is likely why the 8 VSSOPs i just soldered in are malfunctioning.
Again, the top of this (below) says the WTCP-51 is not suitable for ESD operation as the "tip is not anti-static"...but surely the tip is earthed?
https://www.farnell.com/datasheets/1448594.pdf
--- End quote ---
I was always taught not to call somebody an idiot, but to say that they are behaving like an idiot. In your case, I will make an exception and add 'incompetent'.
Let's drill down to the core of your post, carefully positioned near the end... You have soldered down a bunch of VSSOP-8 packaged parts and they don't work. Most likely it is a problem with your design but other alternatives may be thermal or mechanical damage from your flux-free solder blob removal method ( https://www.eevblog.com/forum/manufacture/how-to-solder-8vssop/ , check the soldering constraints in the datasheet - normally 300'C for <10 seconds), or ESD handling damage - you are using a proper ESD strap and mat? or are you still kneeling on the floorboards after spraying them with water? https://www.eevblog.com/forum/manufacture/spraying-wooden-floor-with-water-to-reduce-esd-damage/ ).
As far as the TCP-S. If you say the tip is loose, then you either haven't fitted heater barrel outer sleeve, you haven't tightened it up, or have over-tightened it to the point that the end has belled out and no longer grips the flange on the tip. I suppose it's also possible that you are trying to fit the wrong tips but I assume you tried the one it came with.
From the codes you 'indicated' in your first post, you have a WTCP-51 station, which includes P51 PSU and TCP-S iron, so anti-static. It will take you 2 minutes to check continuity back from the iron's tip to the mains plug earth pin. Please do this immediately and report back. If there is a break, it should be very easy to isolate this to a damaged cable or loose connector.
After you have done this I would seriously suggest that you sleep off whatever you have 'substance' you have imbibed or smoked and then complete a job application for Lidl. I think they are currently the highest paying supermarket in the UK, but also try Aldi and other supermarkets. In your case, I think it would be a mistake to try to go too 'high end'. I honestly think that contact with real people would help with your fantasies, and I sure the money would be helpful after the disappointing recent sale of your company ( https://www.eevblog.com/forum/renewable-energy/intelligent-product-of-switch-mode-power-supplies/msg5551385/#msg5551385
EDIT: To confirm what others and NASA have said, the iron tip should be solidly grounded, this is standard practice for ALL ESD safe irons. There should be no potential difference between the soldering tip and parts in a properly controlled ESD environment. 1M resistors are used in wrist straps purely to avoid accidental electrocution risk if the operator touches live mains.
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