Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Heath Zenith SM 2420 frequency meter
#1

I don't know if it happens with all of them.When I start aligning, everything goes nice and smooth. Then I start lowering the signal strength by attenuator.At the certain point, the reading on the meter goes berserk. It shows less or more, whatever. I know that the correct frequency is still there, but still it's uncomfortable, as my generator is Eico 315 and known for floating,especially at MHZ range. Is there any way to rectify that?
#2

The frequency counter has a minimum signal level requirement and once you go below it, the reading will be unstable or fail to read at all. Not much can be done about it. Just set the freq as best you can and then reduce the attenuator as necessary. Periodically you can increase the signal to confirm that it has not drifted off freq significantly.
#3

Yes it is normal.
But you do not need measure the frequency all the time.
What I do is (my oscilaltor is a tube one) - I let it warm up for 5-7 minutes, and then I set up a frequency on a stable signal and then I simply switch the signal to radio and no longer measure the frequency, until I need to change it, at which point I repeat the process.
If your generator is stable there is no need to constantly monitor the frequency.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Jackson 715 not working
Mrfixr55, its working now. I cleaned the switches and sockets with spray cleaner. Thanks for helping on this one.daveone23 — 06:26 PM
Jackson 715 not working
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM
HiFi (Chifi) tube amp build - but my own design.
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM
Jackson 715 not working
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM
Restoring Philco 37-604C
Yep. F5 is green, D5 is Red. Red is Bad. Green is Clean.morzh — 01:30 PM
Jackson 715 not working
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM
Restoring Philco 37-604C
(Insert Homer Simpson "DOPF" Here.) When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM
Philco 91 Speaker Replacement
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil. It wo...morzh — 08:44 AM
Philco 91 Speaker Replacement
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM
Philco 91 Speaker Replacement
As Rod said, it is OK to use a fitting speaker, and then look for an original one. If you buy a Hammond 125 output tr...morzh — 08:15 AM

[-]
Who's Online
There are currently 3930 online users. [Complete List]
» 1 Member(s) | 3929 Guest(s)
Avatar

>