FNIRSI LCR-P1 Component Tester?

[stj]

native usb - probably an ARM core, but 5v ones are unusual.

[CapLeaker]

native usb - probably an ARM core, but 5v ones are unusual.

I haven’t found anything yet that could fit the bill.

[stj]

then it could be a high end AVR and they are doing usb with a software emulation.
but i dont see a crystal - you wouldnt normally try to do something that timing reliant using an internal oscilator.

[lotas]

On the LCR FNIRSI LCR-ST1 tweezer meter there is this one...

[stj]

identify the wiring and your halfway there.
hook up to the programming pins and even if it's locked you can read the device-id.
grinding mcu's is a pointless waste of time

[stj]

On the LCR FNIRSI LCR-ST1 tweezer meter there is this one...

thats an ST clone.
32F series

[CapLeaker]

thats an ST clone.
32F series

thats what I thought comes close, but cant be as the internal memory isn't big enough

[stj]

the tweezer thing is much simpler so the ST clone is fine,
if you look at the package it's clearly not what is on the large unit

[mon2]

Met this manufacturer in HK in October. Sharing some contact details and their latest catalog.

[sam_sam_sam]

FNIRSI does make nice stuff,
i ordered the "battery tester" to hunt shorts on pcb's!
https://www.aliexpress.com/item/1005007138201986.html

Have you used this device and what do you think of it finding short circuits on circuit boards is it worth the money you paid for it

[stj]

i have had a play with it,
it has very high resolution with repeatable results.
unfortunatly - or maybe not, i have not had any shorts to locate yet!

i will say this, when i got it there was just the 4wire clips with it.
now they have a deluxe pack with extra cables that have probes and a battery holder.
i would recomment this full option.

maybe i will pull out a junk pcb and create a short just to play with it later

[sam_sam_sam]

i have had a play with it,
it has very high resolution with repeatable results.
unfortunatly - or maybe not, i have not had any shorts to locate yet!

i will say this, when i got it there was just the 4wire clips with it.
now they have a deluxe pack with extra cables that have probes and a battery holder.
i would recomment this full option.

maybe i will pull out a junk pcb and create a short just to play with it later

Please do this and please share the results because if it preforms the way you expect it to I might be interested in buying one
Because I need a tool to be able to find short circuits on board and other devices

[stj]

o.k. i'll find a suitable board over the weekend - maybe a laptop board would be a good candidate - i have loads of those.

[sam_sam_sam]

o.k. i'll find a suitable board over the weekend - maybe a laptop board would be a good candidate - i have loads of those.

Please post pictures of the results that you get this would be interesting to see how the actual screen looks when running different tests

[stj]

the screen will just be an ohm-meter.
well a miliohm meter would be more accurate.
i dont think i can hold a camera because i'll need both hands to press the clamps against smd caps
i'll see what i can manage.

[sam_sam_sam]

I am confused by the specifications of this ( that are in this color )

“Range: Voltage 0~±100V (DC); Resistanceo 0~200Ω
Accuracy: Voltage ±0.5%; Resistance ±0.5%
Gear: Voltage: Automatic, 1V, 10V, 100V; Resistance: Automatic, 20mΩ, 200mΩ, 2Ω, 20Ω, 200Ω
Instrument test signal frequency: AC 1Khz”

Can this device be used on machine that have PLC and or Micro Controllers for troubleshooting short circuits I am in desperate need of something that can do this a multi meter is not doing the job that I need to do

Right I have an issue with a machine at work that is tripping out the safety relays circuit unfortunately there are four safety relays three of them are slaves and one is a master one of the slave units has burned up and two contactors have shorted internally shorted to 6 ohms these are 24 volt coils I need a device that I can check out the safety circuit safety without creating more damage to the system

We have wiring diagrams for the machine unfortunately because of it having three machines hooked together to making one big machine the wiring diagram does not contain the wiring between machines so it difficult to trace things down to how each machine interacts with other we have a lot of issues with machines in the past with the safety circuit but time this is worse that I seen

Before the safety relay burning out and the contactor coils shorting internally the machine would run about a minute and trip out again the manufacturer of the machine says that there a short circuit on the safety circuit but called tech support for the manufacturer of the master safety relay and they are saying that the status led lights when in the fault condition is not indicating this but they are saying that we need the software for the safety relay plus a special cable to be able to read the error code which my boss does not want to do

Tech support is not much help with this issue either because either they have not seen this exact issue before or they want to be one that are called out to fix the issue which not really any help

I am sorry if I have high jacked this post but I need information about this device that was mentioned if this post is going to work in the application that I am in need of

[stj]

you can set the test voltage for esr.
read this:

[sam_sam_sam]

When you use this device tell me how easy it to set the resistance range and the voltage range and if one effect the other settings when doing your testing
Because section 4 of this manual is not very clear about what the range is in respect of one digit for example 1,2,3,4,5 or 1,5,10, etc same with the voltage setting
if it has a automatic voltage/resistance range how well does this work or are you better off using the manual configuration that you input to it

I leaning towards buying one but have not decided anything yet about weather or not it's worth the money or if will work for what I need for troubleshooting short circuits

Right now I can somewhat use my blue capacitor tester it not perfect for troubleshooting short circuits but it better than relying solely on a multi meter for this purpose and in the back of my mind I fear that I might fry this device doing this type of troubleshooting when this device was not made for this purpose

There is a connection that needs to be made about how many slave safety relay there are there are 5 of them

Would I be better off buying something like this meter “AE20218 Milliohm Meter Kit, 0.1 Milliohm Resolution, Four Wire Measurement”

https://www.ebay.com/itm/26429413021...saAp7hEALw_wcB

[sam_sam_sam]

STJ

Have you done any testing on boards for shorts do you have any results

[CapLeaker]

STJ

Have you done any testing on boards for shorts do you have any results

I am using the Leakseeker 89 or voltage injection in combo with alcohol or a Flir to look for hard to find shorts.