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| DC Block for spectrum analyzer: minimum safe low cutoff frequency |
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| bob91343:
Are you trying to say that you need to think about this? The OP opened a can of worms. Yes, it's always heat that destroys electronic components (assuming no physical damage). Even an arc has a hot spot and the temperature could easily exceed a safe value. Connecting dc via a dc block doesn't protect anything unless the rate of change of the signal is slow enough. Otherwise the leading edge will pass through and perhaps last long enough to raise the local temperature excessively. I remember hearing on the radio about fire damage. The lady, who knew what she was talking about, said that everything will burn if the temperature is high enough. |
| jonpaul:
Rebonjour: Usie of SA for EMI, esp conducted with LISN can result in DC, high level AC transients, ~ 1/2 peak of mains, etc. We use: 1/ External 20 db 50 Ohm atten 2/ DC block 3/ Set SA on LEAST sensitive RF/IF range 4/ Dual diode transient clamp (low capacitance) After you see the levels, you can gradually relax the protection to get the required sensitivity. Believe me a dead preamp or mixer is NOT a simple or cheap repair on most SA. Jon |
| Feynman:
--- Quote from: jonpaul on June 05, 2022, 10:15:56 am ---Rebonjour: Usie of SA for EMI, esp conducted with LISN can result in DC, high level AC transients, ~ 1/2 peak of mains, etc. We use: 1/ External 20 db 50 Ohm atten 2/ DC block 3/ Set SA on LEAST sensitive RF/IF range 4/ Dual diode transient clamp (low capacitance) After you see the levels, you can gradually relax the protection to get the required sensitivity. Believe me a dead preamp or mixer is NOT a simple or cheap repair on most SA. Jon --- End quote --- 5/ Never switch something on/off or plug something in/out, when the SA is attached :D |
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