phase linear 400

[Gepetto]

Are your +/-15V regulators close to 15V on each of the 4 test points. Don't slip your test probe. Bad stuff can happen

 

[gene french]

you are so kind....
this is totally not possible without phoenix forums...
lots of beautiful support...

you know this is over my head...
but, i appreciate you very much...

 

[gene french]

HUH???

a negative number is smaller than a positive number...


i got one row installed...things turned for the better....

right offset .... +.7 mv
left offset ... -.8 mv

 

[gene french]

Are your +/-15V regulators close to 15V on each of the 4 test points. Don't slip your test probe. Bad stuff can happen

i will go check....is this on the control board or back planes
and i use the gnd test point correct....

 

[WOPL Sniffer]

you are so kind....
this is totally not possible without phoenix forums...
lots of beautiful support...

Yep, you are correct. The guys here helped me through a few item when I started out and the rest is history.

 

[gene french]

found them....
yes, they are almost exactly 15v
wow....

 

[gene french]

going for the second row...is not easy to stab them....
tries ones patience...
and yes, i am checking them before i install...

 

[George S.]

Hmmm,

the important value is the difference from "0.000" -0.0023 is still more than 0.001 from zero.

Yes, I agree. Is this not a issue?

 

[Gepetto]

Hmmm,

Yes, I agree. Is this not a issue?

We will have to give Gene lessons in magnitude and sign for the next lesson I suppose...

 

[George S.]

I'm on the edge of my seat hoping he doesn't slip a probe.

 

[George S.]

Oh, I see, he's already checked the regulators. Well, there's Joe's Rule #1, Check the test equipment. Later.

 

[gene french]

Oh, I see, he's already checked the regulators. Well, there's Joe's Rule #1, Check the test equipment. Later.

row two installed...
.9 mv and .8 mv...
....
you said...less than 1 mv is good...
- 2.3 mv is less than 1 mv...
lol...

feeling better...
the more rows the closer they get...

 

[gene french]

I'm on the edge of my seat hoping he doesn't slip a probe.

i try not to make the same mistake more than 2 or 3 times...lol

 

[George S.]

Cool, it's looking better. Thing is, if I understand correctly, there is + and - VDC on those test points. I see this on my Flukes with the polarity symbols changing. The goal is to be in a window + or - .001 VDC on either side of 0 VDC. -.0023 is outside that window.
Joe, please correct me if my understanding is flawed.

 

[gene french]

if that is true george....then we have just moved up from strict low middling.....
right into high cotton....
with all the back wall populated.....
no smoke, noise, sparks, flames, etc....
came up peacefully....
right channel offset - .7 mv
left channel offset + 8 mv

 

[gene french]

i hate to think i have to remove all of this to solder in bias transistors....
but at least we all know...
thank you!!!

 

[gene french]

if that is true george....then we have just moved up from strict low middling.....
right into high cotton....
with all the back wall populated.....
no smoke, noise, sparks, flames, etc....
came up peacefully....
right channel offset - .7 mv
left channel offset + 8 mv

make that + .8 mv....
as joe can attest....i have trouble with the decimal point...

 

[gene french]

that is less than 1 mv from zero on both channels....
i hope that is the way we understand it...
i wonder why the offset was high until the output installation sequence began...
now with all installed....is very stable...
hope that aint my wishful thinkin....

 

[WOPL Sniffer]

Man you are going to go gray AND bald worrying about all that.... If there were issues, you'd know it.

 

[gene french]

Man you are going to go gray AND bald worrying about all that.... If there were issues, you'd know it.

thanks mr. sniff...i appreciate the encouragement...