DAQ module card for over 300V?

Hi all, 

Currently looking at using a DAQ6510, but we have 3 channels that are just over 300V. I notice none of the cards support beyond 300V.  Is there a 3+ channel DMM that supports above 300V, or some where to make this work with just the 6510?  Would love to make this work with just a single DAQ/DMM, but we need ~40 channels of low voltage and 3 high voltage channels. 

DAQ6510, unfortunately, doesn't have any cards that support higher than 300V.
However, Model 3706A does use the Model 3760 multiplexer card to switch up to 500V maximum per channel.
This mainframe can support up to 6 cards, so you can select other models in the 37xx series to connect to your other 40 low voltage devices.
https://www.tek.com/en/products/keithley/switching-and-data-acquisition-systems/3700a-systems-switch-multimeter