EEVblog #966 - CPM700 Counter Surveillance Monitor Repair

[EEVblog]

Repair of the CPM700 Counter Surveillance Monitor (Bug Detector)

[G7PSK]

Is that the new EEVblog meter?

[Groucho2005]

121GW?   
The power required to run a flux capacitor is 1.21 GW.

[Brumby]

If you can't see the decimal point, you're not worthy.


(If Dave develops another product, I've suggested the model number: 1210MW)  While technically more accurate, it doesn't have the same ring to it.

[daveshah]

How about electronics-style notation and go for 1GW21?

[aromring]

At 33 minutes, that cap in the upper left corner looks suspicious to me...

[slurry]

Oh, i remeber those  but i mostly used the clumsy briefcase oscor 5000, "omni-spectral correlator"
- toys, by todays standard 

[error079]

At 33 minutes, that cap in the upper left corner looks suspicious to me...

And at about 23:59 the spill off electrolyte can be seen on the PCB.

[Groucho2005]

How about electronics-style notation and go for 1GW21?

Great Scott! 

[Erikkssen]

Oh, i remeber those  but i mostly used the clumsy briefcase oscor 5000, "omni-spectral correlator"
- toys, by todays standard 

CPM700 is a discontinued product,
maybe the factory can publish the schematics?   

[SeanB]

2V7 likely is a analogue ground. 2V7 is about right for a LM324 with split rails. Not 3V because of the positive common mode limit.

So a 22 is a LM324, and a 27 is a LM380.

[Ingineer]

Dave, did you try adjusting Vcc and see if that allowed the probe detect to start working again?

[kcozens]

Hm... another successful repair. IIRC, that is two in a row. The EEVblog repair curse has gone away (for good?). We saw just the bottom portion of the new meter in a previous video. Has Dave let the cat out of the bag by allowing us to see an EEVblog branded meter that is not the Brymen one we all know about? This new meter says 121GW on the front. In electronics notation it would be 1G21W as G is the power of 10 and W is units.

[thm_w]

Dave, did you try adjusting Vcc and see if that allowed the probe detect to start working again?

He mentioned on youtube that he did, and that voltage was scaled with vcc so didn't help.

Hm... another successful repair. IIRC, that is two in a row. The EEVblog repair curse has gone away (for good?). We saw just the bottom portion of the new meter in a previous video. Has Dave let the cat out of the bag by allowing us to see an EEVblog branded meter that is not the Brymen one we all know about? This new meter says 121GW on the front. In electronics notation it would be 1G21W as G is the power of 10 and W is units.

https://www.eevblog.com/forum/eda/daves-eevblog-multimeter/

[joeqsmith]

Meter is looking sharp!  Hope the testing is going well and looking forward to seeing it first hand. 

[Fungus]

Do they use resistors as "voltage regulators" to avoid the RF from real ones?


PS (at 11:10): The "ox" input ? 

[EEVblog]

Oh, i remeber those  but i mostly used the clumsy briefcase oscor 5000, "omni-spectral correlator"
- toys, by todays standard 

CPM700 is a discontinued product,
maybe the factory can publish the schematics?   

I heard from someone who worked there, and yes it was discontinued the other year.
It's the original model that the company founder designed.

[EEVblog]

Meter is looking sharp!  Hope the testing is going well

Actually, a few major issues still...

[Barny]

Meter is looking sharp!  Hope the testing is going well

Actually, a few major issues still...

EMC issue in amp-mode? 

[Brumby]

Where's an exorcist when you need one?!!

[Kolby_G]

Is that the new EEVblog meter?

If you type 121GW into the Google Play store, you get what looks like a companion app for the new meter. https://play.google.com/store/apps/details?id=kr.co.finest.eevblog&hl=en
I remember in a previous video Dave mentioned that he didn't want to point out who the manufacture was, if that's the case it might be a good idea to take this app down from the public store, you can tell who the manufacture is quite easily...

[twice11]

If you type 121GW into the Google Play store, you get what looks like a companion app for the new meter. Link removed I remember in a previous video Dave mentioned that he didn't want to point out who the manufacture was, if that's the case it might be a good idea to take this app down from the public store, you can tell who the manufacture is quite easily...

You don't even need to click that link. It cites the app package ID which has been created using the typical Java package naming convention, so it already gives everything away...

[joeqsmith]

If you type 121GW into the Google Play store, you get what looks like a companion app for the new meter.
... Dave mentioned that he didn't want to point out who the manufacture was,...

Guessing that it is far enough along now.

[Stormchaser]

That is one sexy meter. Did I miss an announcement? All the recent videos have just said "mystery meter" and Dave's been reluctant to show much of it on screen (aside from the 3d printed model). Either way, that looks firmly in the "shut up and take my money" category; nicely done Dave! Can't wait for it to go on sale!

[casuallydressedguy]

I don't know whether these will help....   

It appears that my Rev E CPM-700 hasn't had all the markings removed, except for the package mounted to a half assed heatsink (folded piece of aluminium) next to the big black piezo buzzer which is marked '70'.