Multimeter

[DAPPH]

They make special underwear for that.

Can you PM me the details as I have diabetic drip.

 

[MattF]

So it does

View attachment 452642

Have you noted yet that the relevant sockets flash, when you manually select a range, to let you know which sockets to use?

 

[Gragson]

I did pretty much straight off, it's quiet neat, although I've never missed it

 

[MattF]

I did pretty much straight off, it's quiet neat, although I've never missed it

Me neither, but it's a nice touch.

 

[ukracer]

Can you PM me the details as I have diabetic drip.

I have a tablet for that.

 

[premmington]

Me neither, but it's a nice touch.

You need to "get out more".

 

[J1nx]

Can’t beat a fluke, I use one most days, usually the cheapy on the right unless stuff’s going wrong…

 

[optima21]

Seeing as I caved & ordered one, I'll compare it against my others.

have you got one of these Fluke meters, they have a special range on them for people like you

 

[Robotstar5]

have you got one of these Fluke meters, they have a special range on them for people like you

View attachment 452714

Does that belong to seven of nine?

 

[MattF]

have you got one of these Fluke meters, they have a special range on them for people like you

View attachment 452714

When I'm on my death bed though, I'll never be thinking: "I wish I'd...". I treat every day like it's my last.

 

[premmington]

Can’t beat a fluke, I use one most days, usually the cheapy on the right unless stuff’s going wrong…
View attachment 452713

You have been to the yellow meter shop

@J1nx - What do you do for a living?

 

[J1nx]

You have been to the yellow meter shop

@J1nx - What do you do for a living?

Secure power, briefly dipped into solar farms but they are horrendous bodges in most cases with no one wanting to spend a penny. 90% now is data centre power.
Use these to capture rectifier input waveforms etc, step upto 3 phase power meters to monitor load steps, capture transients on transfers, monitor efficiency etc
Use far more expensive Flukes but the 435 and up we borrow/share/rent etc

 

[daleyd]

Off the top of my head, flukes I have are:
115
189
789 processmeter
87v
773 milliamp clamp meter/calibrator
123 scope
323 (?) clampmeter
I40 current clamp

 

[premmington]

Secure power, briefly dipped into solar farms but they are horrendous bodges in most cases with no one wanting to spend a penny. 90% now is data centre power.
Use these to capture rectifier input waveforms etc, step upto 3 phase power meters to monitor load steps, capture transients on transfers, monitor efficiency etc
Use far more expensive Flukes but the 435 and up we borrow/share/rent etc

I only a fat dumb car mechanic....

I got an aging Fluke 123 scope meter - but like the rest of the motortrade we nearly always use picoscopes - multi channel stuff

 

[J1nx]

I only a fat dumb car mechanic....

I got an aging Fluke 123 scope meter - but like the rest of the motortrade we nearly always use picoscopes - multi channel stuff

That’s probably far more complex, I just measure power to the nearest kW or so and make sure the waves are smooth

 

[premmington]

That’s probably far more complex, I just measure power to the nearest kW or so and make sure the waves are smooth

What power stations..?

I been reading a thing of late about how they balance the Hz - I found it very interesting.

 

[J1nx]

No, only critical supplies in power stations, or any other building. Usually generators HV or LV and then UPS battery systems, transfer switches, all the way down to individual data racks on some rare occasions. Majority of work is 100kVA - 5MVA. The solar work, sites started around 5MW upto approx 50MW, but you might work down to a single 15A string.

 

[premmington]

No, only critical supplies in power stations, or any other building. Usually generators HV or LV and then UPS battery systems, transfer switches, all the way down to individual data racks on some rare occasions. Majority of work is 100kVA - 5MVA. The solar work, sites started around 5MW upto approx 50MW, but you might work down to a single 15A string.

Interesting....

I just get end of life cars running again because the owners can't afford a new car!

Nothing green or carbon neutral about my days work....

 

[daleyd]

Interesting....

I just get end of life cars running again because the owners can't afford a new car!

Nothing green or carbon neutral about my days work....

I think your doing yourself a disservice there, keeping stuff going is probably as green as it gets

 

[optima21]

well I did used to have a PC based oscilloscope that ran on windows XP and it was the only thing I had on the laptop as I couldnt get the drivers to work on a later version of windows and when that laptop died, I decided I needed to get one of the handheld ones. I was looking to spend over £100 on one and there are much better ones for that money, but I only use it once in a blue moon and only need it for very basic things. here is an online review

and he has reviewed alot of similar items.

I was planing on taking it to our model engineers meetings to give 5 minute talk on them and planned to show how they can be used with radio control to show the waveforms that operate the servos (50hz square wave with 5 to 10% duty cycle) and speed controllers). then thinking about it further I thought why not build a handheld unit with a oscillocope only (FNIRSI 138 Pro for less than £20) to show how the electrical signals change

View attachment 452500

to show the electrical signals that work in radio controlled models using a cheap oscilloscope.

A) I can show the analog signal (voltage) across a variable resistor.

View attachment 452496

B) I can then feed that into a servo tester, which converts it to a 50 Hz pulse width modulation signal with a 5% to 10% duty cycle (which is the standard type of signal that a radio control receiver sends to the servo or speed controller to actuate them.

View attachment 452497

C) I can then use that to operate a servo and also supply an electromagnetic servo driver (as I havnt got a speed controller with a low enough switching frequency for the pulse width modulation). and I can show the modified signal. I can then feed that into a H drive motor drive module to operate a DC brushed motor.

View attachment 452498

D) I can then show the negative voltage spike when the switching occurs, and shows the voltage generated by the motor just after the motor has been switched off at part power

View attachment 452499

just waiting or a box to be delivered so I can shove it all in.




with your name on here, I would hope that you have a good knowledge of electronics, for someone who uses an oscilloscope once or twice a year it can put then in the rough area of what they are looking for.

finished it now

and the wiring

and cutaway servo and geared motor