Author Topic: V7-45 electrometer made in Belarus (welcome in attoamps world)  (Read 13698 times)

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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #175 on: October 04, 2020, 12:22:06 pm »
Is there any proof that this device is indeed going to provide metrology-grade pure sinus ?
V7-45 do not needed pure sinus or some metrology grade... but stable input voltage is good idea because second stage of power source in V7-45 very simple.
« Last Edit: October 04, 2020, 12:29:29 pm by shodan@micron »
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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #176 on: October 07, 2020, 06:20:23 am »
BSW_M recommended use OPA140 into diff stage, but it's very sensitive and high bandwidth OpAmps, addicted to oscillate. I'm success stabilize it:
1 - on each power rails need install 22uF cer.cap and high quality 100nF NP0 cer.cap, as closer as possible to OpAmps.
2 - C5-50 100Mohm is good and stable resistor but very high inductance, it must replaced to Ohmite RX-1M 100M 1% at least.
3 - C3 must increase to 3-4 nF high quality NP0 cer.cap with very low leakage current.

After all modiffications my diff looks ugly, but works very fine.





« Last Edit: October 07, 2020, 07:32:16 am by shodan@micron »
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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #177 on: October 07, 2020, 10:39:03 am »
V7-45 - Genuine Belvar seal. (Be careful, our sellers can make fake seal, which is like as real genuine seal)


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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #178 on: October 10, 2020, 03:35:03 am »
V7-45 measurement chamber - ionization stress test with Eu-152

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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #179 on: October 10, 2020, 07:03:42 am »
Measurement example: Pu-238 alpha particles current flow.

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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #180 on: October 13, 2020, 09:28:10 am »
I'll try tune again.... maybe ADEV>1E-19A will be achieved

Old K73-11 caps into БВИ(external block) replaced, no any significant effect with noise.
I'll try install low noise OpAmps today...





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Offline Vgkid

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #181 on: October 13, 2020, 11:24:54 am »
Looking forward to seeing if there is any affect, nice job so far.
If you own any North Hills Electronics gear, message me. L&N Fan
 

Offline bsw_m

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #182 on: October 14, 2020, 11:41:41 am »
For those who can read in Russian. Interesting article.
 
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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #183 on: October 15, 2020, 10:41:43 pm »
I'll try install low noise OpAmps today...

My mind is blow up... БВИ have very complicated design. Phase shifting technique use everywhere!!! If i changed someone, phase match is fail. :-BROKE
I'm think - MNIPI engeneers calculated entire БВИ(all 4 PCBs) as single formula.

After 24h really hard sex, i'm start understand some concepts.... it need couple days to complete tuning and modifications.... stay tuned...
« Last Edit: October 15, 2020, 11:33:22 pm by shodan@micron »
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I'm need tank of Bose-Einstein condensate....
 

Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #184 on: October 16, 2020, 02:24:45 am »
БВИ simplified schematic
« Last Edit: October 16, 2020, 02:42:51 am by shodan@micron »
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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #185 on: October 16, 2020, 03:31:00 am »
All БВИ OpAmps replaced to TI OPA140, all carbon high impedance resistors replaced, phase shift are tuned.

Environment: uncontrolled temperature, БВИ case(shield) is opened, air vibration - moderate(Zardonic - Antihero, at medium volume)

First results: 1E-19A level is break through !!!!  >:D

« Last Edit: October 16, 2020, 03:43:23 am by shodan@micron »
My lab in Instagram. LXI Instruments Data Logger apps.
I'm need tank of Bose-Einstein condensate....
 

Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #186 on: October 16, 2020, 08:05:14 am »
Interesting article.

Yup! Very interesting compare.
Looks like Keithley 6430 is a just toy... not a measurement unit. :-DD
But some notes looks like a wrong usage of 6430.... :palm: BelGIM need ampnuts...
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Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #187 on: October 16, 2020, 10:33:51 am »
3 of 4 БВИ PCBs. (genuine)

All four PCB looks small and very simple, but it is wrong opinion!
MNIPI can do up to 4 different functions on single OpAmp! Also all PCB's must be calculated as single domain.

« Last Edit: October 16, 2020, 10:56:42 am by shodan@micron »
My lab in Instagram. LXI Instruments Data Logger apps.
I'm need tank of Bose-Einstein condensate....
 

Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #188 on: October 17, 2020, 08:38:07 am »
My first V7-45 ready to performance verification. I'm closed БВИ module and sealed it. Compute block also sealed.
Device is fully tuned, except charge measurement calibration.

Last pictures of БВИ down bellow.

After 3-5 days of warm-up i've send it to FBU Rostest-Moscow, a main metrology lab of Russian federation to check all parameters of  device.









« Last Edit: October 17, 2020, 09:12:17 am by shodan@micron »
My lab in Instagram. LXI Instruments Data Logger apps.
I'm need tank of Bose-Einstein condensate....
 
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Offline bsw_m

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #189 on: October 17, 2020, 10:02:56 pm »
Measuring the noise shelf V7-45 after rebuild DRK-6, but, this is not end of reworking my V7-45.
I have some plans for modification of this device.
 

Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #190 on: October 18, 2020, 01:14:10 pm »
Yesterday I thought: One of my B7-45s is ready for performance verification.
But I got a surprise this morning "НЕИСПРАВНОСТЬ 03", it means: UVEPROM number 3 is blowup...
After check i found problems with ZIF-sockets.

BSW_M recomend me: Replace DIP to CerDIP package good way for that sockets...
Hmmm... i can't confirm that... All DIP package been replaced to CerDIP earlier.

Only one right way to solve problems with that sockets - totally remove.



« Last Edit: October 18, 2020, 01:18:51 pm by shodan@micron »
My lab in Instagram. LXI Instruments Data Logger apps.
I'm need tank of Bose-Einstein condensate....
 

Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #191 on: October 20, 2020, 01:22:09 am »
For those who can read in Russian: comparison V7-45 vs Keysight B2985A and Agilent 34410A. https://ampnuts.com/v7-45-home-metrology/
Who can't - see tables.
« Last Edit: October 20, 2020, 05:39:55 am by shodan@micron »
My lab in Instagram. LXI Instruments Data Logger apps.
I'm need tank of Bose-Einstein condensate....
 

Offline shodan@micron

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Re: V7-45 electrometer made in Belarus (welcome in attoamps world)
« Reply #192 on: October 20, 2020, 04:37:45 pm »
I go to our local weapon masters plant today, they are make some tools for my V7-45 from garbage.

Dust cap for БВИ and special tools for service MNIPI triax jack.

4 dust caps
6 service tools.
Total: 38$

Soon i'm send one kit to BSW_M, as gift, he filled my lab with tonnes V7-45 fun, thanks!



My lab in Instagram. LXI Instruments Data Logger apps.
I'm need tank of Bose-Einstein condensate....
 


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