Electronics > Repair
Boonton 41-4B power sensor repair advice
Kosmic:
--- Quote from: xrunner on October 22, 2023, 11:57:13 pm --- Do the two signal wires also have their own shield and are these shields tied to the main outside shield?
--- End quote ---
I retract what I said earlier about the cable. It appear to be a little bit more complex than what I thought initially. The 2 conductors are also shielded and there's some kind of black isolator in between the second shield and the conductor wire.
alm:
Low noise cables sometimes use a graphite coating between layers to reduce friction and hence triboelectric effects. This is not an insulator and if anything slightly conductive. It serves as lubraction. For example this is discussed in this thread on the Keithley / Tek forum or this picture.
TimFox:
Another approach in low-noise cables was using a layer of conductive (carbon-loaded) plastic for the same purpose.
Kosmic:
--- Quote from: alm on October 23, 2023, 12:14:49 pm ---Low noise cables sometimes use a graphite coating between layers to reduce friction and hence triboelectric effects. This is not an insulator and if anything slightly conductive. It serves as lubraction. For example this is discussed in this thread on the Keithley / Tek forum or this picture.
--- End quote ---
I'm all aware of the carbon layer used sometimes to reduce triboelectric effect.
Nevertheless, In this case, the black coating is non-conductive and seem to isolate the center conductor from the second shield.
edpalmer42:
--- Quote from: Kosmic on October 23, 2023, 02:00:54 pm ---
--- Quote from: alm on October 23, 2023, 12:14:49 pm ---Low noise cables sometimes use a graphite coating between layers to reduce friction and hence triboelectric effects. This is not an insulator and if anything slightly conductive. It serves as lubraction. For example this is discussed in this thread on the Keithley / Tek forum or this picture.
--- End quote ---
I'm all aware of the carbon layer used sometimes to reduce triboelectric effect.
Nevertheless, In this case, the black coating is non-conductive and seem to isolate the center conductor from the second shield.
--- End quote ---
But if you were looking for a replacement cable, one with such a carbon layer might be helpful, both for shielding and reducing triboelectric effects. A while ago I repaired an XLR-equipped microphone cable with just such a layer. That might be a starting point for a cable search - rugged, flexible, shielded, low triboelectric. Hmmmm.
Ed
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