Nicolas,
If your DSO has an FFT function it could help in checking the higher attenuations.
--John Gord
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On Wed, Jan 19, 2022 at 08:09 PM, <nicolas.mailloux@...> wrote:
Alright, I tried myself with a 3D printed plunger. It's not perfect, I would need to trim a bit on the top because it keeps the blade too low when engaged, but it's doable with time.
The broken plunger is at the capacitor. I booted up my vintage TF2015 Marconi RF generator, set it to 50Mhz and 15Mhz here are the results :
PIN 1 = DC BLOCK
PIN 2 = 20 dB
PIN 3 = 40 dB
PIN 4 = 10 dB
I fed +/- -20dBm to the ATT from the TF 2015. My DSO read +/-63.2mVpp without the ATT and +/-60mVpp with the ATT all position retracted (OFF), a loss of about 1.5-2mVpp
| Source |
20dB |
40dB |
10dB |
Reading |
| 63.2mVpp |
OFF |
OFF |
OFF |
60mVpp |
| ? |
ON |
OFF |
OFF |
6.40mVpp |
| ? |
OFF |
ON |
OFF |
1.60mVpp |
| ? |
OFF |
OFF |
ON |
19mVpp |
| ? |
ON |
ON |
OFF |
0.800 - 1.2mVpp |
| ? |
ON |
ON |
ON |
0.800 - 1.2mVpp |
| ? |
ON |
OFF |
ON |
2.4-2.8mVpp |
| ? |
OFF |
ON |
ON |
.800-1.2mVpp |
