fluke – VoltLog

Voltlog #216 – InTheMail

Welcome to a new voltlog, the series that will touch both your passion for electronics and your bank account at the same time.

We’re gonna start with this multimeter thermocouple which I got from ebay, it’s brown, it looks familiar to those who have a fluke multimeter, and yes it’s branded Fluke. However I got this from ebay for just a few dollars delivered from China so it might as well be fake but honestly who cares, it’s just a thermocouple, it’s gonna work just fine even if it’s a fake one. The think is I got my fluke 87 used without original packaging so it was missing the thermocouple but now I can plug this in and measure temperature as well.

Voltlog #131 – Measuring The Efficiency Of The Ruideng Kis3r33S DC-DC Converter

You might remember this small module from the previous InTheMail, this is the Ruideng dc-dc converter with a claimed efficiency of 95%. Now a figure of 95% efficiency is not unheard of these days, many dc-dc converters can achieve this with proper circuit design.

This particular model uses the MP2307 converter chip manufactured by Monolithic Power and if we take a look at their datasheet we can immediately see where they got the 95% efficiency figure they advertise.

If you own fancy equipment like a source/measure unit than one instrument can do all the measurements and data log the results as well but a source/measure is out of our budget so we will be using multimeters for this test.

Here are links where you can find the equipment used in this video:

Ruideng MP2307 DC-DC Converter: Banggood.
Aneng 8008 Multimeter: Banggood, Amazon, Ebay.
Gophert CPS-3205C Power Supply: Banggood, Amazon.
Fluke 87V Multimeter: Amazon, Ebay.
Gossen Metrawatt Multimeter: Ebay, Amazon.
Owon B35T Multimeter: Amazon, Aliexpress, Ebay.
60W Electronic Load: Amazon, Banggood, Aliexpress.

Voltlog #55 – InTheMail

It’s been a couple of weeks since I’ve uploaded any videos, that’s because I was away for a short vacation but I’m back now and mail items have been gathering up.

Voltlog #34 – Fluke 77 Teardown & Repair, Varistor Replacement

In this video I’m opening the Fluke 77 I scored at a recent auction to show and repair a small issue it has. One of the MOV (metal oxide varistor) in the input protection circuit had suffered damage probably while protecting the rest of the circuit when a HV signal was applied to it’s input, so I decided to replace the MOV.

The original MOV part number is V910LSX1399 specs: 910V 10% 1mA
The replacement MOV part number is Panasonic ERZV10D911 specs 910V 1mA

Voltlog #30 – 2016 Update

This is the first video for 2016 and hopefully one of the many this year. I’m giving you an update on what I’ve been up to, that is an auction score where I got myself some nice multimeters (Fluke 87, Fluke 77 and Tektronix TX1) for a good price and the dark load project that I’m working on.