My first ‘Pyranometer’ - found it used at a VERY reasonable price 🙂

It averages 49.1uV per W/m^2 between 400-1100nm and using my multimeter to do the math, I get a readout of about 700W/m^2 around lunchtime in my lab window 🙂

Not bad at 56deg North ☺️👍🏼

#electronics #electronicsengineering #solarpower #solarpanel #solarenergy #stem #physics #testandmeasurement

I decided to log the mains grid frequency for a full 24hr period 🤷🏼‍♂️🤓

Using the Philips PM6669 and an external OCXO (calibrated, see earlier post when I received it) I get a quite accurate result. Each measurement takes 10 seconds, so in reality there’s some averaging going on right there, removing some of the jitter and noise at those last digits. The grid frequency is highly dynamic once you reach a millihertz resolution, and that is in fact what I’m trying to capture 🙂

The PM6669 counter has a really nice feature btw., it’s max input level is 260Vrms! That’s really handy, in reality I could connect it straight to a mains outlet without damaging it, but due to the risk of transients I’m using a small transformer and the cute little Vellemann oscilloscope training kit so I can pick a more safe 12Vrms instead 👌🏻⚡️🙂

Tonight I’ll have 8640 datapoints to play with 🤓

#testandmeasurement #becauseican #electronics #electronicsengineering #engineer #velleman #philips #gridfrequency #mainsgrid

I decided to log the mains grid frequency for a full 24hr period 🤷🏼‍♂️🤓

Using the Philips PM6669 and an external OCXO (calibrated, see earlier post when I received it) I get a quite accurate result. Each measurement takes 10 seconds, so in reality there’s some averaging going on right there, removing some of the jitter and noise at those last digits. The grid frequency is highly dynamic once you reach a millihertz resolution, and that is in fact what I’m trying to capture 🙂

The PM6669 counter has a really nice feature btw., it’s max input level is 260Vrms! That’s really handy, in reality I could connect it straight to a mains outlet without damaging it, but due to the risk of transients I’m using a small transformer and the cute little Vellemann oscilloscope training kit so I can pick a more safe 12Vrms instead 👌🏻⚡️🙂

Tonight I’ll have 8640 datapoints to play with 🤓

#testandmeasurement #becauseican #electronics #electronicsengineering #engineer #velleman #philips #gridfrequency #mainsgrid

The fundamental RC circuit ☺️
The starting point for many electronics tinkerers, moving onwards from simple DC designs. Found within the first couple chapters of any electronics textbook.

As simple as it may look, there’s surprisingly much to be said and understood about this circuit.

People will say “it’s a low pass filter” (or high pass)”, but how does it actually work, why does it act as a filter?

To understand its frequency behavior, you need to look at it in the time domain.
Two simple components, a square wave signal and any oscilloscope will keep you entertained all night 😃👍🏼

Last week I found myself busy a couple hours at the whiteboard at the local #hamradio club, explaining a lot of this.
Tuesday night, we’ll set up measurements at the bench demonstrating last week’s calculations, it’ll be fun 🙂🙂

#electronicsengineering #electronics #retro #engineer #hamr #testandmeasurement #siglent #rohdeschwarz #circuitdesign

It’s #sensorsunday and this weekend I finally got to use my DIY thermal chamber 😃
Along with a Fluke thermocouple meter it turned out really good 👍🏼

Doing temperature test on the 1M #vintage reference resistor - it’s big and heavy, so I left it to soak at the wanted temperature for at least 8hrs, continuously monitoring chamber and device temperature.

Testing at 10,20 and 40C, I found a slightly negative temperature coefficient, but still well inside the 0.02% specification.

My measurements are a bit lower altogether compared with my initial test where I saw precisely 1M. This is due to coupling between the test wires, when entering the thermal chamber. It’s really hard to avoid, even giga-ohms in parallel, will affect the result.

#testandmeasurement #electronics #metrology #electronicsengineering #engineer #fluke #sourcemeasureunit #keithley #keithleyinstruments

Setting up a new experiment - so far my quality inspectors isn’t quite impressed 😂🤷🏼‍♂️

#kittensofmastodon #testandmeasurement #electronics #eletronicsengineering #fluke

Well that’s close enough for the specified 0.02% 😳 Job well done for a 1974 device 💪🏼🙂 #electronics #testandmeasurement #metrology #electronicsengineer

This weekend I’ve been away from home, participating in a #hamradio 50MHz contest and since the band isn’t open all the time, we usually bring some toys and projects along to pass time👌🏻☺️

I always wanted to experiment with instrument GPIB remote control and as I recently found a #prologix interface module at work, I decided to try it out before ordering my own (they’re quite expensive).

Using the a HP204C oscillator, I’m able to read the frequency from my old PM6669 counter quite simply with Putty Terminal connection to the prologix interface, it works 😃😃

#testandmeasurement #electronicsengineering #electronics #engineer #gpib #instrumentcontrol #hamradio #eevblog

I received some, likely counterfeit, REF200 chips - a quick test with my #keithtley #sourcemeasureunit proved them quite accurate though, so I decided to repeat a classic experiment from early university days: charging a capacitor with a constant current source.

We’re all used to that exponential rise seen in a RC circuit, but replacing the resistor with a constant current source, we get a beautiful linear ramp instead, it’s incline solely determined by the current and the capacitor values.

I knew upgrading to a 4CH #oscilloscope was a good idea ☝🏻😂

#electronics #electronicsengineering #physics #basicelectronics #engineer #hamr #hamradio #mylab #testandmeasurement

It’s Friday and it’s #mailbag night 😃

FLUKE 52ii thermocouple thermometer, 10MHz OCXO and distribution amplifier, a #minicircuits 7GHz mixer, a #brymen 789 multimeter and a carry pouch for my BM235 multimeter. Everyone should have a travel multimeter, right? 😛😂

Have a great weekend out there,

#electronicsengineering #hamr #hamradio #testandmeasurement #

Even though quite rudimentary when RF and electronics is your job/life/passion, sweeping a filter is always a pleasure 👌🏻☺️

This is a 10MHz band pass, meant to be used with reference frequency distribution 👍🏼

Running a square wave through it produces a beautiful sine 🥰

#rfengineer #electronicsengineering #testandmeasurement #siglent #hamr #hamradio

https://www.mohnotinstruments.com/career.html
For Further details,
Contact - +91-9821614731
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#mohnotinstruments #mohnot #kyoritsu #insulationtester #insulation #measurement #megger #resistance #voltage #kew3552 #measurementspeed #1kV #40GΩ #PI #DAR #india #testandmeasurement #instruments #brands #meters #supplier #b2bsales #businesstobusiness

Mailbag Wednesday: new ADF4351 RF generator, unfortunately I can’t afford a pro one.. 🤷🏼‍♂️🙂 So rich on harmonics, but quite ok on phase noise. And it has input for an external reference 👌🏻

Also, new handle and bumpers for my #agilent counter (looks like new now 😃) and a handy little cable stripper/cutter for the small diameters: AWG 20-32

#electronics #siglent #hamradio #hamr #electronicsengineering #testandmeasurement

Wow. 👀

Big potential acquisition/shift in the #TestAndMeasurement and #ControlSystems space.

https://www.usnews.com/news/business/articles/2023-01-17/emerson-reveals-7-6-billion-bid-for-national-instruments

It’s not everyday you find a chip with ‘limitless’ applications 👌🏻🤷🏼‍♂️😂
But being a #burrbrown it may very well be the case ☺️
This #vintage #NOS gem 💎 is dated w41/1988, I’m definitely NOT opening that bag without proper ESD precautions ⚡️☝🏻

Will be fun to test, I doubt it have ever seen power since it left the factory 🙂

#electronics #electronicsengineering #hardwaredesign #vintagelab #testandmeasurement

Looking at the same simple signal on my two oscilloscopes: my #vitage #Hameg and my fancy 4 channel #Siglent.

The Hameg picks it up easily, the Siglent doesn’t, what’s going on?

Back in the days we learned to “throw all levers at the upper position and you’ll catch something on the scope” and there’s a degree of truth to it. Doing that on the Hameg, sets the trigger to AC and it’ll immediately capture a DC offset signal like the one shown.

For some weird reason, every digital scope I’ve ever had my hands on, defaulted to ‘DC’ trigger, which forces you to adjust the trigger level pretty much every time you want to capture a signal.

I’ve now set my scope to default at AC triggering, it’ll cover me 90% of the time, and I can always use DC triggering if I need to capture single events at specific amplitudes.

#yourewelcome 🙂

#electronicsengineering #testandmeasurement #engineer #oscilloscope #tipoftheday #labrat

I ended up ordering a more suitable #calorimeter, I want to repeat my previous test with better accuracy.

My #keithly #sourcemeter really is a nice companion when doing things like this, I designed a new resistor heating element meant to run at a higher voltage and I get a precise reading of the power dissipated 👍🏼 Many bench supplies will do this too, but not at the same accuracy.
And accuracy is what I’m looking for in this setup.

The calorimeter was reasonably cheap at Amazon and shipment took 5days including the weekend.

Stay tuned 👌🏻🙂

#stemeducation #stem #engineering #physics #testandmeasurement

Almost a year ago, I used a shallow tub of water to map the equipotential lines and derive the field lines between two electrodes submerged in the water.
I used 30Vdc, except in a single case where I switched to 60Vdc as can be seen at the picture with the Fluke meter. The center line is at 30V, not 15 🙂
As a fun thing, you can submerge LEDs in the water, and if they’re oriented the right way according to the field (polarity)direction, they’ll actually light up, right there in the water! 🚨💧👌🏻🤓
It’s a fun and safe way to play with electric fields and experience their properties 👍🏼
#stem #stemeducation #physics #physicslab #testandmeasurement #engineer #eevblog #fluke

I built a simple #calorimeter and used it to prove that an arbitrary AC signal will heat a resistor equally compared to a DC signal with the same amplitude as the RMS amplitude of the AC signal 🤓
This a fundamental rule and the reason we universally use RMS to describe any AC signal amplitude: by the end of the day, everything revolves around power transfer.
A funny experiment involving many interesting disciplines: temperature measurement, building a small heating element, basic math/physics and some basic measurement techniques.
#stem #stemeducation #electronics #physics #engineer #testandmeasurement #siglent

Finally, after almost a year wondering how to do it the best way, my Rubidium Standard found a decent enclosure 👍🏼
A massive heat sink at the bottom provides the needed base cooling of the module, the LEDs and the small panel voltmeter monitors lock state, power supply and other BITE outputs 🙂
#hamradio #hamr #testandmeasurement #electronics #electronicsengineering #rfengineering