SCXI1102, 1104, 1581 input/output connection safety issue

[kmchiang]

I have a testing rack that contains a PXI-1011 chassis with SCXI1102, 1104 and 1581 cards.  We use the SCXI 1300 & 1303 terminal blocks to connect to the cards.  The wiring from the terminal blocks go to a custom rack connector that we use.  To validate the proper operation of the daq we connect a breakout box to our custom rack connector so that we may perform such tasks as connecting a calibrated voltage source or connecting a picoammeter  to verify proper operation.  My question is - are there any safety concerns (to both hardware and personnel) of connecting our breakout box to the rack (essentially to the card terminal blocks) while the chassis and cards are powered on?  Or should we power off the unit prior to connecting to its terminals?  Please confirm.

[Ryan_V[DE]]

kmchiang,

Of course, it is always safer to power down your system whenever making connections. If you do not wish to do this, however, I would reccomend disconnecting the terminal block from the module. This will prevent any of the high voltage pins of your 1104 from being exposed. Finally, if you wish to disconnect your measurements at the custom rack connector, the equipment should not suffer any damage. Because I do not know the details of your custom setup, I cannot comment on the personal safety.

Hope this helps,

Message Edited by Ryan V on 08-26-2005 05:58 PM