For sale bare boards for Delta Pulse/Sniffer XR-71

[chuubaba]

Kindly tell me what scope settings for TIME/DIV ?

[kt315]

set probe on T4 and T5 and tell what signals' widths you see.

[chuubaba]

I am going to install 15nf 250v.I will buy 18nf and other as soon as i have completed all the tests.
Lets do all tests so i know which parts to buy.

[kt315]

why you run for depth? 3 meters is not enough? you want 6 meters?? who told you that 600us will work on your groung stabile?
me??? leave this matter out. set 15 and forget all i did tell you above.

[chuubaba]

Kt315 I like 22nf 100v green capacitor because it is giving me 150uS to 640uS. I hope this will give me more depth. Is this acceptable ?

[chuubaba]

I tested with a 22nf 63v and pulse widh in 150uS to 620uS

I tested with 15nf 250V and pulse width is 100uS to 440uS.

I tested with 20nf 200V and pulse width is 100uS to 600uS.

[chuubaba]

MEASURED VALUE I ASKED -!!!! EVERY COMPONENTS MUST BE MEASURED BEFORE BEING INSTALLED ON BOARD.

I have no instrument to measure capacitance. The capacitor written value is 15n 100v.

I have 15nf 250V in green color and in yellow colour ceramic. Also i have 22nf .

[kt315]

MEASURED VALUE I ASKED -!!!! EVERY COMPONENTS MUST BE MEASURED BEFORE BEING INSTALLED ON BOARD.

[chuubaba]

good. measure C3 and tell the value.
now increase 15nF to 18nF C3.

C3 installed on my board is 15nf 100V.

I have 100nf 250V and 22nf in green colour and also yellow colour available. There is no 18nf in stock.

[kt315]

good. measure C3 and tell the value.
now increase 15nF to 18nF C3.

[chuubaba]

now you have to find a component which value you have to change to get needed this 500us (we need 150...500us range).
without hint from my side.

Value of C3 !5nf and R4 6k2 responsible for pulse width.
I have used the same values in my board.

[chuubaba]

I wonder how many people on this can answer this question.
Post #515 and #702 of this thread discusses C4, R7, C5. R1, R4. (I have used precise values as written in BOM

I want to complete this board in the earliest . Lets continue doing further tests. In the meanwhile i search for answer of your question.

[kt315]

Why this board didn't achieve 500uS pulse width?
Should I perform the next test?
==
good Q. now you have to find a component which value you have to change to get needed this 500us (we need 150...500us range).
without hint from my side.

[chuubaba]

So the pot to "full anti-clock" was 100uS Pulse Width.
The pot to "full clock" was 410uS.
The difference is 310uS.
Correct ?
Why this board didn't achieve 500uS pulse width?
Should I perform the next test?

[kt315]

[ATTACH]47908[/ATTACH]

I can expect my mind failure but i don't want a heart failure.
Please correct me.

probe x10 divider applies to VOLTAGE ('Y' AXIS :: VERTICAL AXIS),
NOT TO THE TIMING ('X' AXIS :: HORIZONTAL AXIS).