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Caleb Kraft
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Re: Waxed paper parts
Caleb Kraft   3/27/2014 10:52:47 AM
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@zeeglen, I have no idea why they would be wax covered. I was hoping someone would give a valid explanation in the comments. I'm guessing it is shielding of some type, but is wax paper that effective?

Caleb Kraft
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Re: No Mirror?
Caleb Kraft   3/27/2014 10:51:38 AM
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I'm not sure what you're referring to, but now I'm really curious!

Caleb Kraft
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Re: Waxed paper parts
Caleb Kraft   3/27/2014 10:50:49 AM
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I can understand your confusion. This is not a typical thing to see. Usually, only capacitors would carry that waxy coating. however, in this case, those are resistors. You can see it in the schematic as well as just figure it out by looking at what the mode selector that they are attached to does. it changes the resistance!

Wnderer
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No Mirror?
Wnderer   3/27/2014 10:23:26 AM
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I think it's strange that it doesn't have a mirror. I thought even the cheap ones had a mirror to deal with parallax.

zeeglen
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Re: Waxed paper parts
zeeglen   3/27/2014 9:32:49 AM
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@ Caleb - Why wax sleeves over the resistors?  Might this be intended as an indication of overheating if a user applies a higher-than-rated voltage, or any voltage with the function switch set to "ohms"?

@ molear - looking at the schematic and parts list these are 1% resistors, there are only 3 wax paper caps listed.

molear
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Waxed paper parts
molear   3/27/2014 7:09:15 AM
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The parts in waxed paper are NOT resistors.  Those would be capacitors, and I would be very careful using that device.  The old paper and wax capacitors can go bad.  I've had one explode and blast scraps of burning paper around the room.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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