Start by looking at the specification. The cDAQ chassis needs 9 to 30V (12V or 24V are common) that can supply a maximum of 16W. If you want to power both chassis with the same supply, you will need 32W. If you want to power other things with this supply, you need more power capacity.
And P = V*I. So do a little math to figure out which supply you need. NI's supplies are 24V. Assuming a single supply for both chassis, you need 32W/24V = 1.3A. So the NI PS-14 (24V, 3.3A) will work just fine.
I am personally using a DRB120-24-1 by TDK-Lambda to power one of my cRIO systems. It is about 1/5 the price of the NI equivalent.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5