08-09-2005 08:24 PM
08-10-2005 03:58 AM
Hi Trinity79,
What frequency are you using to check this out at? The higher the frequency the more crosstalk you will get. From the spec sheet this switch offers better than -25dB channel to channel crosstalk @ 10MHz, This equates to about 6% of the original signal. The crosstalk spec also reduces by 20dB per decade so if you are using around 50 MHz this will give you about -15dB which is approx 25% of the original signal. It is possibe that this level of crosstalk is mostly due to the wiring of the terminal block, in which case you may need to re-wire using coaxial cable.
Hope this helps,
Nick
08-10-2005 10:59 AM
The SCXI-1160 is an SPDT general purpose relay that can switch medium power signals and was not designed for optimal crosstalk. Therefore we do not have any crosstalk specification pertaining to the SCXI-1160. The crosstalk specification given by Nick is probably the one fro the SCXI-1166.
Since you are using the SCXI-1160 in a matrix configuration you are probably interconnecting a lot of SPDTs with wires crossing each other in the terminal block. All these wires crossings contribute to the crosstalk. What I would suggest is checking you wire layout and making sure wires are isolated from one another and grounded connected to the chassis ground. If you are switching differential signals make sure the pair is twisted, shielded and grounded as well.
Guy Ferraro
Switch Product Support Engineer
NI-USA
08-10-2005 04:19 PM