* * *
Welcome, Guest. Please login or register.
Did you miss your activation email?
10-23-2017 -- 13:36:55

Login with username, password and session length

Top 10 Posters

flew-da-coup (1293)
Hawaii596 (983)
USMCPMEL (824)
Hoopty (545)
docbyers (544)
MIRCS (532)
PMEL_DEVIL-DOG (509)
griff61 (500)
Thraxas (498)
CalLabSolutions (468)
Members
Stats
  • Total Posts: 18408
  • Total Topics: 3307
  • Online Today: 54
  • Online Ever: 242
  • (04-19-2014 -- 19:20:34)
Users Online
Users: 1
Guests: 50
Total: 51

Author Topic: Avtron Inc. K225 Modulation Meter  (Read 239 times)

Offline dminesinger

  • 5-level
  • ***
  • Posts: 230
  • Action Taken: +5/-0
    • Email
Avtron Inc. K225 Modulation Meter
« on: 10-08-2017 -- 22:37:45 »
Need to generate 5% modulation, 20 Hz on 115 VAC signal to test this unit. What do I use?
PapaBear

*'It's the Veteran, not the reporter who has given us the freedom of the press.'
'It's the Veteran, not the poet, who has given us the freedom of speech.'
''It's the Military who salutes the flag, who serves beneath the flag, and whose coffin is draped by the flag, who allows the protester to burn the flag.'

Offline briansalomon

  • 5-level
  • ***
  • Posts: 193
  • Action Taken: +4/-1
    • Email
Re: Avtron Inc. K225 Modulation Meter
« Reply #1 on: 10-09-2017 -- 21:20:11 »
If all you need to do is modulate a 115V 20hz signal, an old Elgar SW (smartwave) series AC power source has an external modulation input.

See page 9 of this link - http://www.programmablepower.com/ac-power-source/CSW/downloads/AMETEK's_Elgar_SW_and_California_Instruments_CSW_Form_Fit_and_Features_Comparison_Tech_Note_10_6_11.pdf

If you need 5% modulation at 20hz riding on a 115v/60hz wave you need two of these (or similar power sources) phase locked together.

Offline dminesinger

  • 5-level
  • ***
  • Posts: 230
  • Action Taken: +5/-0
    • Email
Re: Avtron Inc. K225 Modulation Meter
« Reply #2 on: 10-10-2017 -- 00:20:57 »
Signal needs to be 115VAC/400Hz modulated with a 20 Hz signal to 5% AM Modulation.
PapaBear

*'It's the Veteran, not the reporter who has given us the freedom of the press.'
'It's the Veteran, not the poet, who has given us the freedom of speech.'
''It's the Military who salutes the flag, who serves beneath the flag, and whose coffin is draped by the flag, who allows the protester to burn the flag.'

Offline Mr M.

  • Pinger
  • *
  • Posts: 8
  • Action Taken: +1/-0
Re: Avtron Inc. K225 Modulation Meter
« Reply #3 on: 10-10-2017 -- 01:45:39 »
An Agilent 33250A Function / Arbitrary Waveform Generator and a Fluke 5205A Precision Power Amplifier works great. The 33250A with an Elgar AC Power Source as an amplifier also works well but the 33250A may not have enough output voltage in AM mode to fully drive the AC Power Source to 115V so I also use an ST series transformer to step up the output from the 33250A to the input of the AC Power Source. I monitor the modulation, AM or FM, as required at the output of the 33250A even though the 33250A is always very nearly spot on. I monitor the 115V output from the AC Power Source with a 34401A, I have had some issues using a 3458A with modulated AC but it can be done.   

 


DISCLAIMER:  This site is not an official US Air Force site, it is intended for private use only.  It is not endorsed, in any way, by the US Air Force, the DoD, or any other governmental agency.  Additionally, all information found within this site is just that, it is NOT meant to be used in place of authorized publications.


All logos and trademarks in this site are property of their respective owner.

All forum content is the property of the respective poster, all the rest 2004-2017 by PMEL Forum.