I successfully registered, thank you 😉
Hi. My name is Wojtek.
This is my first post, so please forgive me if I write something wrong. Additionally, my native language is not English, which I am currently writing in…
But I’ll get to the point.
I have the generator given in the title of the post. (RS APN62) I have a problem, that the output voltage readings on the generator differ significantly from those measured with a multimeter. Where can I look for the cause? Is it supposed to be like that? And the problem is with the resistance mismatch.
For example: frequency 1 kHz output voltage set on generator 1 V. Connected multimeter shows around 2 V…
I have tried many multimeters and it’s the same.
Analogowa Grupa Wywrotowa. Wojtek. 🙂
@audiotone Welcome, looks great to me! I too have noticed this with my generators before. I do not have any terminators and figured that was why the voltage was not being pulled down to the correct level. Someone else can validate that, but that was my understanding. For example, if the generator is set to 50 ohms, the voltage across a 50 ohm resistor should be correct. (again I am not certain in this case, I will do some reading)
Radios + Tubes + Scopes + Cars= Nothing better!
Thanks for your answer.
So, how about bypassing the input to the multimeter with a resistor of, say, 50 ohms…. I’ll have to check that.
I’ll let you know how it goes. 😀 I didn’t think about that. In analog meters I have shunt resistors of 47 kohm installed right at the input.
Analogowa Grupa Wywrotowa. Wojtek. 🙂
I’ve already checked. APN62 has the ability to adjust the internal output resistance. I set the generator to 45 ohms of resistance and added a 47 ohm resistor to the multimeter in parallel. Only now was the result correct. APN 62 can have output resistance setting from 10 ohm to 2 kohm.
Case solved 😀
thanks @RadTekMan
Now I can start repairing my next piece of equipment, which will be the KEITHLEY 175A multimeter.
Analogowa Grupa Wywrotowa. Wojtek. 🙂
I forgot to add a photo….. and I couldn’t edit the post.
1:
APN 62, Freq:400Hz, 1V out, R=45ohm
<a href=" removed link ” target=”_blank” rel=”noopener”> removed link
2:
K 197 + 47ohm
<a href=" removed link ” target=”_blank” rel=”noopener”> removed link
3:
K 2015THD + 47ohm
<a href=" removed link ” target=”_blank” rel=”noopener”> removed link
4:
K 2100 + 47ohm
<a href=" removed link ” target=”_blank” rel=”noopener”> removed link
All work fine 😊
Analogowa Grupa Wywrotowa. Wojtek. 🙂
I forgot to add a photo….. and I couldn’t edit the post.
I had to learn how to paste pictures.
Please, admin, delete my post above with incorrect links to pictures. I just don’t know why the photos are uploading twice…
1:
APN 62, Freq:400Hz, 1V out, R=45ohm
[/img]” target=”_blank” rel=”noopener”>[img] [/img]
2:
K 197 + 47ohm
[/img]” target=”_blank” rel=”noopener”>[img] [/img]
3:
K 2015THD + 47ohm
[/img]” target=”_blank” rel=”noopener”>[img] [/img]
4:
K 2100 + 47ohm
[/img]” target=”_blank” rel=”noopener”>[img] [/img]
All work fine 
Analogowa Grupa Wywrotowa. Wojtek. 🙂
@audiotone Very nice! Like I said, so far I have gotten away from needing to use one, although the need to get some is still valid. Terminators, Tees, and more BNC cables are on the list to get eventually.
Radios + Tubes + Scopes + Cars= Nothing better!
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