Oms law (1 Viewer)

[autorouter]

312358305432 found this on eBay will it do the job?.

I don't think this is very good for DC work, either amps or volts. It calls itself an AC DC tester, but will not measure DC amps at all. (the 'ripple' symbol next to the 200A and 20A range means AC). Many meters used by electricians who work just on AC mains 240/400 volts are like this. The double line symbol, upper one full, lower one dotted, means DC - as seen next to the 600V range

The one I use is this one.

UNI-T UT210E Handheld RMS AC/DC Mini Digital Clamp Meter Resistance Capacitance | eBay

Model：UT210E. Capacitance (F)：2nF/20nF/200nF/2μF/20μF/200μF/2mF/20mF ±(4%+5). Jaw Capacity: 17mm. Input Impedance for DCV: ≥10MΩ. Zero Mode: √. Resistance (Ω)：200Ω/2KΩ/20KΩ/200KΩ/2MΩ/20MΩ ±(1.0％+2）. DC Current (A)：2A/20A/100A ±(2%+3). ).

www.ebay.co.uk

It's a Uni-T UT210E. It can measure 100 amps, AC or DC, but more importantly it has a 2 amp range for measuring small currents, useful when tracing what's draining the battery.

It comes with red and black leads for measuring voltage and resistance. Resistance test is good for testing fuses, finding breaks in wires, and bad contacts. One slight downside of this meter is, it is in AC mode when it it switched on. You have to remember to press the blue button to switch it to DC mode (if you measure in the wrong mode you can get bizarre readings, but won't damage the meter).

 

[kevenh]

^^ I bought one of those after looking around the Fun forum!!

Vipar, as you progress through your troubleshooting, do update here & ask about the next steps of your checks.

 

[Jaws]

312358305432 found this on eBay will it do the job?. I have no intention of touching AC ⚰⚰⚰

As an electronics engineer I have an intense dislike/mistrust of clamp meters
They are fine for heavy work, but when you are looking for a problem that may be milliamps you may as well use a box of tissues !
This , or something similar is a far better bet

ANENG AN881B+Digital Multimeter Handed Temprature AC DC Voltage CurrentTester BR | eBay

Model Number: AN881B+. DC current：2mA / 20mA / 200mA / 20A. AC Current:2mA / 20mA / 200mA / 20A. DC Current:2m-20m-200m-20A. Display Type: Digital Display. The manual:X1. crocodile clip:X2. Test lead:X2 (The length of the：880mm).

rover.ebay.com

If you would like a step by step guide of how to use it to check current draw from your battery, I am happy to talk you through it rather than put it on here.. The reason being many folk have tried to explain how to do it and many folk have failed to understand.
Results have been varied from blowing a meter to getting false or useless readings

Happy to send you my fone number or you can send me yours and I will call you when it is convenient ( and you have the meter and van at your disposal )

^{_{Subscribers  do not see these advertisements}}

 

[autorouter]

An Arab with a very Indian accent.

All the same, these blooming foreigners.

 

[hilldweller]

As an electronics engineer I have an intense dislike/mistrust of clamp meters

OK but the one many of us in here have is amazingly good.

I've just clamped my UNI-T on it's 2A DC range to see 9mA going through an LED.

UNI-T DIGITAL UT210E 100Amp 600V AC DC CLAMP METER Multimeter True RMS VFC diode | eBay

1 Cloth Bag. 1 Gift Box.

rover.ebay.com

Mind you, it should be good at the price.

 

[Jaws]

OK but the one many of us in here have is amazingly good.

I've just clamped my UNI-T on it's 2A DC range to see 9mA going through an LED.

UNI-T DIGITAL UT210E 100Amp 600V AC DC CLAMP METER Multimeter True RMS VFC diode | eBay

1 Cloth Bag. 1 Gift Box.

rover.ebay.com

Mind you, it should be good at the price.

Yep, but it only does amps .. For general use I still reckon an ordinary meter is the way to go

^{_{Subscribers  do not see these advertisements}}

 

[tonyidle]

You'd have to measure it's resistance with a multimeter, then work out how much current it would draw by using this bit of ohms law I=V/R ?

And that won't help because resistance hot is very different to resistance cold.

 

[hilldweller]

Yep, but it only does amps .. For general use I still reckon an ordinary meter is the way to go

Yes to 3 decimal places.

When it comes to current and the crude way MHs are wired a clamp meter is much easier because you don't have to struggle to open a connection. That is exactly why I bought it. Then sold the MH which solved all the problems of a MH.

I've still got plenty of uses with home automation.

 

[autorouter]

Yep, but it only does amps .. For general use I still reckon an ordinary meter is the way to go

There's two sockets (red & black) in the base, that you can't see in the pictures. It does volts and ohms through those.

^{_{Subscribers  do not see these advertisements}}

 

[kevenh]

It's called a mulitmeter not an amp meter

 

[jdk62]

Ivy Watts is a Powerful girl.....

 

[Vipar]

​

​ Compact and highly portable smart battery charger RAC 4 Amp Smart Charger RAC-HP239 is a fully automatic 6V and 12V battery charger with a capacity of 1.2-120Ah. It is suitable for petrol/diesel engines up to 3000cc, as well as wet, gel, AGM and maintenance free lead-acid batteries. Fully automatic 6V and 12V Microprocessor controlled with 5 stage intelligent charge Faulty battery indication Winter charging mode and maintenance mode Battery charger is dust proof and splash-proof IP65 This RAC smart battery charger also has a diagnosis and rescue function for deeply discharged batteries down to 9V. Along with a series of protection functions: short circuit, reverse connection and overload. Images shown for illustration purposes Hi guys I bought this from eBay to keep all my batteries topped up do I clip it to my engine battery or my leisure battery? I want to leave it on all the time. Can I plug it into one of the sockets in the van then plug the van in. Or should I plug into house directly?

^{_{Subscribers  do not see these advertisements}}

 

[Richard n Ann]

​

​ Compact and highly portable smart battery charger RAC 4 Amp Smart Charger RAC-HP239 is a fully automatic 6V and 12V battery charger with a capacity of 1.2-120Ah. It is suitable for petrol/diesel engines up to 3000cc, as well as wet, gel, AGM and maintenance free lead-acid batteries. Fully automatic 6V and 12V Microprocessor controlled with 5 stage intelligent charge Faulty battery indication Winter charging mode and maintenance mode Battery charger is dust proof and splash-proof IP65 This RAC smart battery charger also has a diagnosis and rescue function for deeply discharged batteries down to 9V. Along with a series of protection functions: short circuit, reverse connection and overload. Images shown for illustration purposes Hi guys I bought this from eBay to keep all my batteries topped up do I clip it to my engine battery or my leisure battery? I want to leave it on all the time. Can I plug it into one of the sockets in the van then plug the van in. Or should I plug into house directly?

Buy one for each battery ? plug them in where ever is most convenient, doesn't matter.

 

[Richard n Ann]

And that won't help because resistance hot is very different to resistance cold.

The heater must have a temperature coefficient then. Most resistive heaters current draw can be worked out as the resistance doesn't change.

 

[tonyidle]

The heater must have a temperature coefficient then. Most resistive heaters current draw can be worked out as the resistance doesn't change.

I presume a halogen heater will have a similar temperature coefficient to a halogen bulb. Both use a tungsten filament. By comparison a heater using nichrome wire (the usual stuff for exposed elements) has a very low temperature coefficient.

^{_{Subscribers  do not see these advertisements}}