Hi,
Here is the schematic of the little box. The bigger diode type is not clean for me. I hope it helps you:
Krisz
1.5SE36A (NTE4940 analog)
Overvoltage Suppressor 36V .
Protection against higher voltage.
Suppressors are usually used in impulse power supplies.
They protect against voltage surge.
Installed on the primary winding of the transformer.
As I wrote the box gives a certain voltage
and limits its current to 100mA.
3g57
Ok, thanks!
The fixture will arrive tomorrow!
Hi,
The fixture arrived, and I could not wait, I opened the box and installed the fixture. I followed the open and shorts test procedure, but not succeed. ERR 1 and then ERR 4 flashing :/
Krisz
Hi! Krisz!
I did not know that you would buy the option 16023B BIAS CONTROLLER.
You hurried. You should have bought PM2811 for this price.
You would have got one more device and it was run by DS BIAS!
I work this way.
How to calibrate PM2811/PM2813 it I described here!
https://www.eevblog.com/forum/reviews/phillipsfluke-pm2811-power-source/msg1322150/#msg1322150He has a discreteness of 1mV. Learn.
It allows you to limit the current.
3g57
p.s. I uploaded your HP4274A circuit yesterday.
Has studied. You have a problem in A3.
I will write later. You need to do measurements on A3.
ERR 1 and then ERR 4 flashing
It is necessary to make measurements.
I think you have a problem with the signal level on A3.
You need to check:
1. Input BNC connectors. Cable from them to leak
2. R28 - loss of contact or poor contact.
3. Voltage to CR1, CR18
4. In А3 - ТР2, ТР3,
5. key Q2,3,4
6. the key Q10,11,12,13,14
7. carefully U5. Comporator LM339P she manages the keys.
you need to get passport modes on T3 and T6.
Remember that the common points are different!
I hope that the power supply voltage of the module is normal.
The following models did not use an operational amplifier. The discrete elements were installed.
Perhaps this is more reliable.
Hi,
Thank you! I now measure the suggested areas.
I come back later with values.
Krisz
Hi,
Thank you! I now measure the suggested areas.
I come back later with values.
Krisz
Your x10 AMP is not working well.
Well, I check the list, here are the results:
R28 10 ohm - OK
A3 TP2 34mv
A3 TP3 -7mV
It is interesting, I just checked.
A6 TP1 -10mV
A6 TP2 -2mV
A6 TP3 +2,5V
A5 TP1 +5,97V
A5 TP2 -5,97V
You wrote to me that with the oscillator is normal!
Now go from the oscillator!
Yes, it was normal and worked fine, but now I just checked and you see that what measured. :/
I checked the test signal on H Cur with the scope. Pic attached. Here is the test signal nice sin wave and the levels is ok.
Open the manual and see FIGURE 8-31.
Follow the path.
DSA2 is a TRD DECODER
Bottom left.
TP1, TP4?
Are the transformers identical?
swap places. look!
A6 TP2 = 1.5VP-P is the norm.
see above FIGURE 8-40.
Try it!
check again the sigils A6.output A2
You have a problem in a weak signal.
You rotate the handle of the oscillator to the left and from the middle you clean it completely.
Ok, I check with the Figure 8-40.
Krisz! Hi! Make yourself on the HP4274A.
I do not have a good file for this. I made an example for the HP4275A.
You will be more clear.
Do not confuse RMS and P-P with measurements. You're close with the problem.
Do not rush.
Observe such conditions with respect to HP4274A.
They are different from you.
3g57
Hi,
Yesterday I had a small problem with my scope. I fixed it first.
Today I rechecked the following test points, I followed the charts.
Figure 8-16
A6 TP1 500 mVrms - OK
A3 TP3 3,3 Vrms - I measured 1 Vrms
Go to A3 troubleshooting Figure 8-31
A3 TP2 8,4Vpp - OK
Controlled by vernier? - yes
A3 TP3 All amplitudes (0.01 , 0.1 , 1 , 5 Vrms) - All OK
A3 TP4 3 Vpp - I measured 1.6 Vpp
Check A3T2 transformerI checked to the A3 TP1 7Vpp - I measured here 1.6 Vpp
Check A3T1 transformerIt is possible that both transformers have been broken?
TDK 113G1 used and this is compatible with this?
http://uk.farnell.com/murata-power-solutions/76602-1c/transformer-pulse-1-1-1/dp/1087810Thanks!
Krisz
T2 may have broken down.
T1 - I do not think it burned out
Check the keys and the comporator!
T2 is installed at the output. K through it could discharge the capacitor.
Check Q4.!