Ni 9237 has problem when excitation voltage is 10V

[EricMgNiBh]

HI everyone

I am  calibrating NI 9237 , everything is ok except when I adjust the excitation voltage equal to 10V, DMM displays is 5.46 which according to table in its verification process is wrong.

Anyone knows why its happens only when is 10 Vex ?>

Thanks

[J-Barticus]

Hi,

Do you measure a large offset for any other excitation voltage levels? What pins on the NI-9237 are you measuring between? Just want to make sure you are measuring between an EX+ and EX- pin. Do you have anything connected to the NI-9237? The 9237 has a power excitation limit of 150mW, if something connected to the device would cause it to exceed this value when 10V is used, then the 9237 will limit the voltage output to protect the internal components.

-Jake B.

[EricMgNiBh]

Hi the connection is correct, I think its because I am trying to measure from all channels. when I adjust 10 vex in labview , DMM displays around 5,46 V for all channels. 

[J-Barticus]

Below I have provided a link to a Knowledge Base that discusses the NI 9237 limiting the output voltage in order to protect the internal components. Also listed are some acceptable channel configurations under the 150mW power limitation.

http://digital.ni.com/public.nsf/allkb/7CBC67482CC9FB318625758C0048FF73?OpenDocument

-Jake B.