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YouTube Video Episodes / Vici VC8145 Bench Multimeter - Calibration Attempt - Pt 4

« Last post by SeanB on April 01, 2020, 02:23:39 AM »

Vici VC8145 Bench Multimeter - Calibration Attempt - Pt 4

https://www.youtube.com/watch?v=Y-DYo_L3l3A

A look at calibrating the Vici VC8145. Challenges with calibrating AC voltage.

A great written review and look inside by Henrik:
https://lygte-info.dk/review/DMMVici%20VC8145%20UK.html

Software by Hendrick for this and other meters:
http://lygte-info.dk/project/TestControllerIntro%20UK.html

A couple of articles about multimeters, these two are about the design:
https://lygte-info.dk/info/DMMDesign%20UK.html

https://lygte-info.dk/info/DMMDesignProtection%20UK.html

Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
Amazon Store: http://astore.amazon.com/m0711-20

YouTube Video Episodes / Vici VC8145 Bench Multimeter - A Look Inside - Pt 3

« Last post by SeanB on March 27, 2020, 08:19:04 AM »

Vici VC8145 Bench Multimeter - A Look Inside - Pt 3

https://www.youtube.com/watch?v=-d5GvizNQ-w

A look inside the Vici VC8145 to see how it operates.
A great written review and look inside by Henrik:
https://lygte-info.dk/review/DMMVici%...
Software by Hendrick for this and other meters:
http://lygte-info.dk/project/TestCont...

ICs inside the Vici VC8145:
The main multimeter IC, FS9704:
https://www.ic-fortune.com/upload/Dow...
Micro Processor/Controller, Holtek HT48R30A-1:
https://www.dataman.com/media/datashe...
LCD driver and RS232 data interface, FSUP01-003.
RMS-to-DC Converter, Analog Devices AD737J:
https://www.digchip.com/datasheets/pa...
Voltage Reference Diode, Texas Instruments LM185-1.2-N:
http://www.ti.com/lit/ds/symlink/lm38...
Dual D-type flip-flop, HEF4013B:
https://assets.nexperia.com/documents...
EEPROM, ATMEL AT93C46:
http://ww1.microchip.com/downloads/en...

Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton
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YouTube Video Episodes / Rubidium Frequency Standard Buyers Guide - High Accuracy Clock Project

« Last post by SeanB on March 17, 2020, 12:29:06 PM »

Rubidium Frequency Standard Buyers Guide - High Accuracy Clock Project

https://www.youtube.com/watch?v=Nd2GOtPyXUM

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In this video I provide some guidance and tips to buying a Rubidium Frequency Standard on eBay.
Some helpful links:
http://www.ham-radio.com/sbms/LPRO-101.pdf
http://www.wriley.com/A%20History%20of%20the%20Rubidium%20Frequency%20Standard.pdf
http://www.tect-electronics.com/uploads/files/Accubeat/AR60A%20Spec%2024%205%2011.pdf

FEI Frequency Standards:
https://www.prc68.com/I/FEIFS.shtml
https://time-nuts.febo.narkive.com/jEZIVGmI/fe-5682a-coming-any-info

Mini Precision GPS Reference Clock:
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=107&products_id=301
http://www.ka7oei.com/10_MHz_Rubidium_FE-5680A.html

FEI Rubidium Atomic Frequency Standards:
https://freqelec.com/low_g_oscillators/

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Patreon: https://www.patreon.com/mjlorton
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https://www.programmingelectronics.com/arduino-crash-course/?orid=12382&opid=6

General Discussion / Re: Various bench safety questions...

« Last post by SeanB on March 16, 2020, 01:01:14 AM »

How about simply getting a small consumer unit, with 4 ways, and installing the box inline with the cable, with cable glands onto the cable. that way you can use a DIN mounting AC DC GFCI along with a 16A breaker.

General Discussion / Various bench safety questions...

« Last post by bsodmike on March 14, 2020, 06:42:51 AM »

Hi all/Martin -

I'm putting a small bench/workspace together and found your videos on isolation and potential shocking dangers at the bench.

For the past 25 years or so I've always relied on UPSes to provide stable power to my computer-related equipment, and I plan to follow the same practice as I'm now in an apartment where the generator kicks in after a short delay whenever the mains power fails. Whenever the generator engages/disengages, the mains power can surge as it is extremely poorly regulated as well.

Therefore, I plan to run my bench equipment via a UPS; right now I only have a Tektronics 'scope and a Keysight programmable bench PSU. If anything were to float, it will be the DUT, not my 'scope.

Unfortunately I've not been able to locate a 240vdc capable inline-GFCI (with UK plug/sockets) -- so I'll have to rely on the GFCI fitted in the breakerboard.

Any further thoughts on this?

Cheers, M.

YouTube Video Episodes / High Accuracy Clock - Inhibition Compensation, What Is It?

« Last post by SeanB on March 12, 2020, 11:45:32 AM »

High Accuracy Clock - Inhibition Compensation, What Is It?

https://www.youtube.com/watch?v=PnXMNl4EzdQ

The next update on my project to build a High Accuracy Clock.
In this video I explain what Inhibition Compensation / Correction is and how it is used to trim or regulate timekeeping [in a quartz clock].
I also show the timekeeping performance of my prototype clocks: TCXO vs OCXO vs Atomic (Rubidium).

General Discussion / Re: Which is the best inverter?

« Last post by Odhran on March 08, 2020, 03:34:31 PM »

I have a Honda, it’s about 10 yrs old, never missed a beat. Regular oil changes keep them happy.
When I was doing movie work, all the trucks had honda’s, they would run 12-14 hrs a day. Very little problem with them.
If you have gone through 3 generators on your new truck, your buying some cheap crap.

YouTube Video Episodes / Vici / Vichy VC8145 Bench Multimeter Review

« Last post by SeanB on February 25, 2020, 01:54:39 PM »

Vici / Vichy VC8145 Bench Multimeter Review

Part 1

https://www.youtube.com/watch?v=znu1v-5sflw

Part 2

https://www.youtube.com/watch?v=79M_yTN2sqg

A review of the Vici / Vichy VC8145 Bench Multimeter, 80 000 count resolution.
An excellent written review here:
https://lygte-info.dk/review/DMMVici%20VC8145%20UK.html

Ian Johnson's website.
https://www.ianjohnston.com/

Support me through Patreon or by using my Amazon Store:
Patreon: https://www.patreon.com/mjlorton

Amazon Store: http://astore.amazon.com/m0711-20
Or anything on Amazon:

https://www.amazon.com/?_encoding=UTF8&camp=212353&creative=380557&linkCode=sb1&tag=m0711-20

YouTube Video Episodes / Rigol DS4000 10 MHz Input Ref Issues

« Last post by SeanB on February 14, 2020, 12:43:39 PM »

Rigol DS4000 10 MHz Input Ref Issues

https://www.youtube.com/watch?v=B-eec6O0PS4

A look at the challenges and issues with ensuring that the 10 MHz reference input signal on the Rigol DS4000 is working correctly.

https://www.eevblog.com/forum/testgear/help-with-rigol-ds4014e-on-10mhz-external-ref/?all

I also take a look at an ovenized crystal oscillator (OCXO) and demonstrate how sensitive they can be to temperature changes, and shock. I look at the internal crystal oscillator drift / calibration of the following instruments on my bench:
* HP / Agilent / Keysight 58131A frequency counter
* Aim TTi TF930 frequency counter
* Aim TTi TG2511A function / frequency generator
* Fluke 164H multifunction / frequency counter
* Fluke PM6685 universal frequency counter

YouTube Video Episodes / HAQ Clock v2.0

« Last post by SeanB on February 06, 2020, 12:27:09 PM »

HAQ Clock v2.0

https://www.youtube.com/watch?v=j9DEfYbgUA8

High Accuracy Quartz Clock v2.0
A new clock circuit using an Arduino with code that I have written.
It has much better accuracy than the previous DIY clock as shown by the Rigol DS4000 oscilloscope: ~ 21uS in a day, which means less than 0.01 seconds per year (using a GPSDO).