Posted Fri, 17 Mar 2023 09:40:08 GMT by Robert Liang
<p>Hello,</p> <p>I have a Keithley 6430 (as a small current source) and a 6517B (as a picoammeter), and I want to connect one from another to do some tests.&#160;However, the triaxial connector conductor definition of these two instruments are different;(So I cannot connect them directly using a triaxial&#160;cable).</p> <p>These definition are as follows (inner conductor, inner shield, outer shield):<br> * Keithley 6430: (HI, GUARD, LO)<br> * Keithley 6517B: (HI, LO, GUARD)</p> <p>The previous method I tried is using 2 [triaxial-to-alligator-clip] cable, however the noise introduced by this connection seems to be large(about 1pA/sqrt[Hz] @ 0.1Hz) even with a shielding case.</p> <p>To solve the above problems, I'm ordering a customized low-noise triaxial cable (6430 and 6517 HI-to-HI, LO-to-LO). There're two soldering plans, and&#160;I can't decide:</p> <p>* 1st plan: 6430 connector direct connect to cable; 6517 connector's&#160;outer shield (Guard)&#160;disconnected, inner shield (LO) is soldered to cable's outer shield layer. (In this case, 6430's 'Guard'&#160;tightly surround 'HI', 6517's connector requires soldering).</p> <p>* 2nd plan: 6517B connector direct connect to cable; 6430 connector's inner shield (Guard) disconnected, outter shield (LO) is soldered to cable's inner shield layer. (In this case, 'LO' tightly surround 'HI', 6430 side connector requires soldering).</p> <hr> <p>&#160;My questions are as follows:</p> <p>&#160;1. Which plan is better?</p> <p>2. Can any of these plans work? (Are they worth to try? Any suggestions of selecting cable?)</p> <p>3. If they can't work, is there a better solution?</p> <p>Thank you!</p>
Posted Mon, 20 Mar 2023 23:40:56 GMT by C, Andrea
If you want to connect the two meters together without soldering a cable, need three items:<br> triax cable to 6430 preamp (7078-TRX-3)<br> Insert 237-BNC-TRX into end of 7078-TRX-3 cable<br> Put 7078-TRX-BNC triax to BNC adapter onto 6517B;&#160; attach the cable.<br> <br> If you want to make your own, see attached image.

You must be signed in to post in this forum.