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

[chuubaba]

ground is connected to potentiometers
---
no no. this is '+E' potencial - for shielding, i call it 'COLD COIL END'.
you have to connect your probe GND to '-E' or '-12V' point.

T2 has AC current or DC?

This is the wave form on 5mS/DIV 0.5V/DIV DC setting. Looks like the frequecy is 50Hzs. If I turn the PPS then frequency does not change. If I adjust the PPS then the small dots near the wave form start moving fast or change movement direction.

If i connect GND of the probe with -12V and take measurement then the wave form looks like this.

This is the wave form in X-Y mode.

[kt315]

ground is connected to potentiometers
---
no no. this is '+E' potencial - for shielding, i call it 'COLD COIL END'.
you have to connect your probe GND to '-E' or '-12V' point.

[chuubaba]

good, but mistake.

Tank you KT. I could not have corrected this mistake without you supervision. I have corrected this.

Now i need to know Time and Volts settings for o-scope...

I have set the probe to 10x and ground is connected to potentiometers and probe is inserted in T2.

[kt315]

good, but mistake.

[chuubaba]

[kt315]

chuubaba;262239]This test is performed without installation of MOSFET ?

ye, without MOSFET. i write that 3 time. WITHOUT MOSFET.


I found a 220v meter that has 56K Ohms resistor and a 1N4007 diode. Can this be used as a uA meter if i remove the resistor and the diode?
[/QUOTE]

probably yes. at first step do not connect it (to the pcb). it is not so important for work of DP.

[chuubaba]

set 100Hz in point T2 - trimmer PPS. search the signal on o-scope.

This test is performed without installation of MOSFET ?

I found a 220v meter that has 56K Ohms resistor and a 1N4007 diode. Can this be used as a uA meter if i remove the resistor and the diode?

[kt315]

set 100Hz in point T2 - trimmer PPS. search the signal on o-scope.

[chuubaba]

I have installed all components except tantalums.
What is the next step?

[kt315]

also, you have to clean every C and R pins BEFORE soldering in board.
by a resin eraser that school children use everyday. on this pic best one.
you clean 'grey/black' oxide layer that isolates the pin from soldering. if you do not want to do that you will get PROBLEMS.

EVERY PIN BEFORE SOLDERING.

[chuubaba]

why i must give same links again and again? litera A is 10V while i CLEAR wrote to use tantalums on 16V -
!!!!!!!!!
you do not try to understand what i write. a laziness?

I bought 10V for C42.

....


Ok I see my mistake now. I am going to talk with seller about this.

[kt315]

learn also especcialy made by me thread https://www.geotech1.com/forums/show...-on-boards-LOL!

why i must give same links again and again? litera A is 10V while i CLEAR wrote to use tantalums on 16V (ie 20V is also good).

[chuubaba]

sorry, i fogot to say. you set tantalums on last step.

I haven't yet installed the Tantalum capacitors.

This wire and paste i use.

[kt315]

sorry, i fogot to say. you set tantalums on last step.

[kt315]

use https://en.wikipedia.org/wiki/Flux_(...ium_Loeten.jpg

use standart ROSIN RESIN COLOPHONY. do not use exotic chinese flux.