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409, 41x, 42x, 44x, 48x -
14x, 18x, 1801 Nanovoltmeters
15x, 18x Null Detectors/Microvoltmeters
- Keithley Applications
- Posts: 1280
- Joined: October 15th, 2010, 10:35 am
- Country: United States
Further, the 220 makes use of the center conductor and the inner shell of the triax. Forcing a BNC onto this will make connection to the center conductor and the outer shell.
The data sheet for the 220 lists accessory item 6167 which is a two lug triax to BNC adapter. It will route the inner shell of the triax to the BNC outer shell.
Here is information on the 6167:
As stated, Triax comes in two and 3 lug. With the two lug Triax connector it's too easy to be tempted to use BNC connectors. The choice depends somewhat on how much money you have invested in the two lug cables and your plans for upgrades.
The correct conversion as stated is the 2-Lug Triax to BNC adapter (which drops the guard) and then to a BNC to Dual banana plug adapter. If it's more convenient, you can use a BNC to single banana after the adapter and use the existing Banana jacks on the instrument for low.
I think it's wise to just consider to internally change the 2 lug Triax to a 3 Lug Triax connector and the adapter accordingly. You just have to be careful when doing the conversions with cleanliness to preserve the ability to source low level currents.
Keithley's Triax cables are quite unique with the graphite internal coatings for low level measurements.
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