Will this test load work?

[anselm]

No I was talking about measuring all this when using a TEST-LOAD, as this thread
is about a test-load, not an actual diode.
I thought that using a test-load was implied.

Doing this with an actual diode is indeed not recommended at all, if you like to keep
the magic smoke INSIDE your components.


Oh, and 123splat:
Welcome to the LPF!:wave:

 

[Flaminpyro]

If that is the case then what did you mean by this statment as it looks like you are
telling him to put the meter in amp mode and measure the current directly using the
meter leads to complete the circuit :thinking:
I can read your statment no other way and I'll bet he can't either !

You can get away with measuring with the DMM in series and in amp measuring mode...

 

[anselm]

I said that because you can do it. I should have added that my experience
is limited to lm317 based drivers, though.
I did hint at the possible danger to the driver, maybe not strong enough:

...and security (for the driver) to have a complete
circuit to begin with, not relying on your DMM-probes to complete the circuit...

Certain drivers can (actually, I think most of Dr.Lavas drivers do, but I have never
used one) indeed take damage when run without a load,
which is likely to happen when relying on DMM-probes to complete the circuit.

The test load itself or the DMM are never in danger, AFAIK.

EDIT: OK yeah, I see now JakeGT WAS talking about a microboost, but I was answering
123splat, IDK what driver he was going to use.

 

[Flaminpyro]

A boost driver and a linear driver are two different animals and should be treated as such.
The linear driver could care squat about inductance but the boost driver is very finicky about that.
you can remove the load (LD) from a linear driver with out thinking about it but if you do that
with a boost driver you will most certinly kill it !

Have a good day

I said that because you can do it. I should have added that my experience
is limited to lm317 based drivers, though.
I did hint at the possible danger to the driver, maybe not strong enough:

Certain drivers can (actually, I think most of Dr.Lavas drivers do, but I have never
used one) indeed take damage when run without a load,
which is likely to happen when relying on DMM-probes to complete the circuit.

The test load itself or the DMM are never in danger, AFAIK.

EDIT: OK yeah, I see now JakeGT WAS talking about a microboost, but I was answering
123splat, IDK what driver he was going to use.

 

[anselm]

Thank you for clearing this up!:beer:

 

[Cyparagon]

why read mV and apply Ohm's law when you have a DMM and can read mA.s directly?

Because ohm's law is too easy. I=V/R, but R is 1 in this case equates to I=V.

 

[jakeGT]

What I still don't get is if Your driver isn't I'n your host, how are
You supposed to keep it hooked up to a battery when doing a test load? Just old the leads to the battery?

 

[Flaminpyro]

You could tape them to the cell if that is all you can do.

Or get a block of wood and drive a couple screws into it far enough apart
so you can slide the cell inbetween them and get a good contact.
take the screws out and put some wire leads into the screw holes
and put the screws back in and you off and running.

or you could make one of these, it's just a 18650 host with leads comming
out and a led light so I'll know for sure when it's turned on

What I still don't get is if Your driver isn't I'n your host, how are
You supposed to keep it hooked up to a battery when doing a test load? Just old the leads to the battery?

 

[jakeGT]

okay, tape will work for now, but yes i wanted something quick and easy to switch out cells between if i needed to test with different cells, so tape will do for now, but wood blocks and screws is a good idea also

any tape work? scotch? electrical? masking? any preference

 

[anselm]

Dude, just try out whatever you have lying around and see what sticks best....
Electrical works for me, at least 3 or 4 times, then it gets dirty and looses its "sticky".

 

[Coherent Light]

You know it's times like these that a good variable bench power supply comes in real handy.

 

[Flaminpyro]

A good bench supply is very handy to have for sure I bought a very good bench
power supply a $400.00 one, it's an Agilent U8002A and after many dissapointments
with loosing boost drives I have quit using it for setting them. now the only thing
I use for ALL boost drive set-ups is this 18650 host and it works fine and I have never had a problem with this set-up :beer:

You know it's times like these that a good variable bench power supply comes in real handy.

 

[jakeGT]

I just didn't know if it could get burnt up or something. Not a big deal

Dude, just try out whatever you have lying around and see what sticks best....
Electrical works for me, at least 3 or 4 times, then it gets dirty and looses its "sticky".

 

[Flaminpyro]

To be sure it could get burn't up and a rock from space could fall on your house, they both have happened befor !
Just do the best you can and check everything twice then check it once more

PS did you catch post #14

I just didn't know if it could get burnt up or something. Not a big deal

 

[jakeGT]

No jeff, I did not until just now, that was literally the only one at radioshack that was anywhere near 1ohm, the next closest was 10ohms where can I get a regular 1ohm resistor? Without having to wait a week for ahipping

 

[Flaminpyro]

Digi-Key on line or I could send you a 1 watt model