EEVblog #966 - CPM700 Counter Surveillance Monitor Repair - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: January 25, 2017, 03:03:42 am
content: Repair of the CPM700 Counter Surveillance Monitor (Bug Detector)

author: G7PSK
author_rank: Super Contributor
timestamp: January 25, 2017, 09:42:37 am
content: Is that the new EEVblog meter?

author: Groucho2005
author_rank: Regular Contributor
timestamp: January 25, 2017, 10:33:42 am
content: 121GW?The power required to run a flux capacitor is 1.21 GW.

author: Brumby
author_rank: Unknown
timestamp: January 25, 2017, 11:52:05 am
content: 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.

author: daveshah
author_rank: Unknown
timestamp: January 25, 2017, 01:12:01 pm
content: How about electronics-style notation and go for 1GW21?

author: aromring
author_rank: Unknown
timestamp: January 25, 2017, 04:33:27 pm
content: At 33 minutes, that cap in the upper left corner looks suspicious to me...

author: slurry
author_rank: Regular Contributor
timestamp: January 25, 2017, 04:37:44 pm
content: Oh, i remeber thosebut i mostly used the clumsy briefcase oscor 5000, "omni-spectral correlator"- toys, by todays standard

author: error079
author_rank: Newbie
timestamp: January 25, 2017, 05:03:11 pm
content: Quote from: aromring on January 25, 2017, 04:33:27 pmAnd at about 23:59 the spill off electrolyte can be seen on the PCB.

author: Groucho2005
author_rank: Regular Contributor
timestamp: January 25, 2017, 05:25:54 pm
content: Quote from: daveshah on January 25, 2017, 01:12:01 pmGreat Scott!

author: Erikkssen
author_rank: Contributor
timestamp: January 25, 2017, 07:03:10 pm
content: Quote from: slurry on January 25, 2017, 04:37:44 pmCPM700 is a discontinued product,maybe the factory can publish the schematics?

author: SeanB
author_rank: Super Contributor
timestamp: January 25, 2017, 08:43:50 pm
content: 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.

author: Ingineer
author_rank: Contributor
timestamp: January 25, 2017, 11:15:18 pm
content: Dave, did you try adjusting Vcc and see if that allowed the probe detect to start working again?

author: kcozens
author_rank: Contributor
timestamp: January 26, 2017, 12:31:36 am
content: 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.

author: thm_w
author_rank: Super Contributor
timestamp: January 26, 2017, 12:42:02 am
content: Quote from: Ingineer on January 25, 2017, 11:15:18 pmHe mentioned on youtube that he did, and that voltage was scaled with vcc so didn't help.Quote from: kcozens on January 26, 2017, 12:31:36 amhttps://www.eevblog.com/forum/eda/daves-eevblog-multimeter/

author: joeqsmith
author_rank: Super Contributor
timestamp: January 26, 2017, 01:08:26 am
content: Meter is looking sharp! Hope the testing is going well and looking forward to seeing it first hand.

author: Fungus
author_rank: Super Contributor
timestamp: January 26, 2017, 06:55:29 am
content: Do they use resistors as "voltage regulators" to avoid the RF from real ones?PS (at 11:10): The "ox" input ?

author: EEVblog
author_rank: Unknown
timestamp: January 26, 2017, 08:27:03 am
content: Quote from: Erikkssen on January 25, 2017, 07:03:10 pmI heard from someone who worked there, and yes it was discontinued the other year.It's the original model that the company founder designed.

author: EEVblog
author_rank: Unknown
timestamp: January 26, 2017, 08:29:24 am
content: Quote from: joeqsmith on January 26, 2017, 01:08:26 amActually, a few major issues still...

author: Barny
author_rank: Frequent Contributor
timestamp: January 26, 2017, 10:33:13 am
content: Quote from: EEVblog on January 26, 2017, 08:29:24 amEMC issue in amp-mode?

author: Brumby
author_rank: Unknown
timestamp: January 26, 2017, 10:37:47 am
content: Where's an exorcist when you need one?!!

author: Kolby_G
author_rank: Newbie
timestamp: January 26, 2017, 07:38:51 pm
content: Quote from: G7PSK on January 25, 2017, 09:42:37 amIf 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=enI 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...

author: twice11
author_rank: Contributor
timestamp: January 26, 2017, 11:25:14 pm
content: Quote from: Kolby_G on January 26, 2017, 07:38:51 pmYou 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...

author: joeqsmith
author_rank: Super Contributor
timestamp: January 26, 2017, 11:50:00 pm
content: Quote from: Kolby_G on January 26, 2017, 07:38:51 pmGuessing that it is far enough along now.

author: Stormchaser
author_rank: Newbie
timestamp: January 28, 2017, 04:13:59 am
content: 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!

author: casuallydressedguy
author_rank: Newbie
timestamp: February 03, 2017, 03:37:33 am
content: 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'.

author: Brumby
author_rank: Unknown
timestamp: February 03, 2017, 03:41:47 am
content: Ooooh. Numbers!