Avtron Inc. K225 Modulation Meter

Started by dminesinger, 10-08-2017 -- 17:37:45

Previous topic - Next topic
Print
Go Down Pages1
User actions

dminesinger

10-08-2017 -- 17:37:45
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.'

briansalomon

#1
10-09-2017 -- 16:20:11
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.
Bring technical excellence with you when you walk in the door every day.

dminesinger

#2
10-09-2017 -- 19:20:57
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.'

Mr M.

#3
10-09-2017 -- 20:45:39
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.   
Print
Go Up Pages1
User actions