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Schematic for HP 16047B Test Fixture

peter bunge All Messages By This Member #95720 Does anyone have (or has drawn) a schematic for the 16047B test fixture used with impedance analyzers? Mine seems to have modifications. There is a drawing of the insides in the Operating Note 1600-90001 for the 16047A/B/C, 16048A/B/C, 16034B, and 16023B. See photo of the insides of my unit below this picture with the lid open. The two 470 uF capacitors are in series (+ to +) and in series with the HiCur connection. There are two banana sockets for bias I assume. There is a 1k 2W resistor in this line to the + of this bias input. The 8 diodes to ground on the LowCur connection is normal as are the two 0.27 ohm resistors in the HiCur & SPDT microswitch circuit. My sketch shows these two resistors as 20 ohm 10Watt so I will have to re-check. I will clean up my sketch and post it but would like to return the box to original HP design.
peter bunge All Messages By This Member #95721 Here is the schematic of my unit. It does not make a lot of sense to me. Any thoughts? The diodes I understand, the 20 ohm (0.27 ohm according to the parts list) I don't, especially the one off the uSwitch Note that Ground is not to any of the BNC connections, except their grounds. toggle quoted message Show quoted text On Thu, Apr 4, 2019 at 12:44 PM peter bunge via Groups.Io <bunge.pjp=[email protected]> wrote: Does anyone have (or has drawn) a schematic for the 16047B test fixture used with impedance analyzers? Mine seems to have modifications. There is a drawing of the insides in the Operating Note 1600-90001 for the 16047A/B/C, 16048A/B/C, 16034B, and 16023B. See photo of the insides of my unit below this picture with the lid open. The two 470 uF capacitors are in series (+ to +) and in series with the HiCur connection. There are two banana sockets for bias I assume. There is a 1k 2W resistor in this line to the + of this bias input. The 8 diodes to ground on the LowCur connection is normal as are the two 0.27 ohm resistors in the HiCur & SPDT microswitch circuit. My sketch shows these two resistors as 20 ohm 10Watt so I will have to re-check. I will clean up my sketch and post it but would like to return the box to original HP design.
peter bunge All Messages By This Member #95742 Does no one have an HP16047B? Any comments on my schematic? I think the microswitch is wired incorrectly. It only takes 4 screws to check inside. I see one for sale with 4 DIN connectors that I don't think are original.

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