WTB: LPM with fast response (Ophir?) sensor.

[Nocturnal]

minimum 200mw? or does it just mean it works best >200mw??

 

[jib77]

You can also use a 12VDC wall wart with the circuit in >>this<< post to power the head.

 

[lazeerer]

I'm going to take the plunge and grab one.

I've been searching for the last 20 or 25 minutes to find a similar LED panel in blue instead of red. I couldn't find one with the appropriate resolution. If anyone happens to have found one, know of a link, let me know. I'm going to place my order in ~30 minutes. Going to search for a nice housing first

Here is the Same One Iam Useing on my 5W one.

4-1/2 Blue LED DC 20V Digital Volt Voltage Panel Meter | eBay

Perfect for an OPHIR Head.

 

[DTR]

Almost bought that one originally but it was a little over $7 more and I went with the red. I may have to get one as I think the blue looks better.:eg:

 

[rhd]

Here is the Same One Iam Useing on my 5W one.

4-1/2 Blue LED DC 20V Digital Volt Voltage Panel Meter | eBay

Perfect for an OPHIR Head.

I saw that one to, but the "0.01V" resolution (10mV) scared me off. Think that's a typo?

 

[lazeerer]

I saw that one to, but the "0.01V" resolution (10mV) scared me off. Think that's a typo?

Here is what you want to look at:

Range: 0-19.999V DC


Nospin meters use this display as well.

You will be fine.

Must be a type-O...

Ive bought 2 of them already and them work Just fine.

 

[lasersbee]

Here is a diagram 300EVIL over @ PL made for me. You can use 2 9V batteries instead of four like the picture or you can replace them with two 12V out DC-DC converters as I did. :beer:

As shown that drawing does not work....


Jerry

 

[rhd]

As shown that drawing does not work....

Jerry

What an insightful post.

?

 

[lasersbee]

What an insightful post.

?

Thanks...:beer:
I guess you saw the error as well...

Jerry

 

[rhd]

Well, there's no power supply going to the meter itself, but I wasn't considering that a flaw. I presume the drawing left that out intentionally.

 

[jib77]

The drawing does not show the tap for the virtual ground at +18VDC.

 

[piferal]

NOS=New Old Stock... :crackup:
The heads were actually New Surplus unused heads.
DTR has the correct link for the new Calibrated ones..



What draws the majority of the current is the converter
if used and the LED DPM...
An LCD type would no doubt draw less current..



You are still correct.. It is a Digital Panel Meter (DPM) that
just happens to be a voltage measuring type...

Jerry

Thanks for the clarification :beer:

The panel meeter draws 90mA. So that leaves 40mA being drawn by the head and the converters. I prefer the LED as it is much better for making LPM videos for my tutorials or customers.

Here is the one I ordered. If you get something similar read the description carefully they have ones that look identical but some don't have the same resolution or range.
This is a 20V range with 1mV resolution.
4 1/2 Digital DC20V Voltage Panel Meter Voltmeter | eBay



Here is a diagram 300EVIL over @ PL made for me. You can use 2 9V batteries instead of four like the picture or you can replace them with two 12V out DC-DC converters as I did. :beer:

I expected something like this with this type of display,
but perhaps not this amount of difference compared with mine.

The LCD voltmeter that I have only consumes 19mA, 71mA more is quite different.

It is certainly something to consider when using these panel meters with batteries
to have something portable, since they consume much current.

Thank you DTR for checking the power consumption of your device.

 

[rhd]

The drawing does not show the tap for the virtual ground at +18VDC.

Isn't the intersection of the gray and brown wires where we get the virtual GND from?

 

[DTR]

The drawing does not show the tap for the virtual ground at +18VDC.

Do you mean it is not showing that the brown and grey wires are actually connected where they run over each other?:thinking:

 

[lasersbee]

Well, there's no power supply going to the meter itself, but I wasn't considering that a flaw. I presume the drawing left that out intentionally.

No ... the meter is not the error... A DMM with it's own battery
could be used... It makes no difference in the proper functioning
of the OPHIR head..

On a drawing with different color wires you cannot assume
that different color circuits are connected together.
That is why different colors are used...

The drawing clearly shows that there is NO connection at
that junction because of the use of different colors...

Drawing attached.... showing the error...


Jerry

 

[madog]

I want to thank those who have posted in this thread as I am tired of using a DMM in conjunction with my 20C-A.
I just didn't know which questions to ask to remedy the problem.


Thanks guys!