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don.r:
It uses a 100uV square wave and goes down to 1uOhm resolution. The connection is indeed 4-wire.
Neomys Sapiens:
--- Quote from: don.r on October 06, 2019, 10:05:16 pm ---It uses a 100uV square wave and goes down to 10uOhm resolution. The connection is indeed 4-wire.
--- End quote ---
Is it a square wave or does it alternate polarity? When you say 4-wire, does this mean that the BNC outer conductor is not a screen, but the L/H drive signal, respectively?
Vgkid:
Don.R do a teardown of your simpson 444. I always wanted one. I have a Ballantine 3205b instead(I think I paid a bit under 100 for it.) It a teardown is floating around on the forum
Neomys Sapiens:
And the only aquisition of a otherwise busy weekend was a REVERSE IEEE488<>IEC625 adaptor (Amphenol on the device side, Sub-D25 towards the cable).
The other way round is found more often.
don.r:
--- Quote from: Neomys Sapiens on October 06, 2019, 10:13:15 pm ---
--- Quote from: don.r on October 06, 2019, 10:05:16 pm ---It uses a 100uV square wave and goes down to 10uOhm resolution. The connection is indeed 4-wire.
--- End quote ---
Is it a square wave or does it alternate polarity? When you say 4-wire, does this mean that the BNC outer conductor is not a screen, but the L/H drive signal, respectively?
--- End quote ---
Yes. Alternate polarity. Outer conductor is indeed a drive signal (or sense... not sure).
--- Quote from: Vgkid on October 06, 2019, 10:18:32 pm ---Don.R do a teardown of your simpson 444. I always wanted one. I have a Ballantine 3205b instead(I think I paid a bit under 100 for it.) It a teardown is floating around on the forum
--- End quote ---
Ok... https://www.eevblog.com/forum/testgear/simpson-444-micro-ohmmeter-teardown/msg2727236/#msg2727236
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