input and output differ

[papacode]

I have a pxie-6358 in a pxie-1062 with controller pxie-8360.

when i give a 1V sine wave on ao0 I do not read 1v on ai0.  I have tried with the test panel and the example vi's.  I am not sure why this would happen so am not clear how to start diagnosing the problem.  any help is appreciated.  thanks

[Henrik_Volkers]

First, some more information would be helpfull(my crystal-ball is currently under recalibration 😉 )

How do you apply 1V AC ? 

How did you wire the DAQ ?

How did you setup the DAQ ?

AND finally: What did you actually measure?

[papacode]

How do you apply 1V AC ?

using the test panel analog ouput, 10ks/s,100hz

How did you wire the DAQ ?

with cable from ao0 to ai0

How did you setup the DAQ ?

default test panel

AND finally: What did you actually measure?

very small, like 30mV...

[papacode]

ok, checked output with other hardware and the output is correct at 1v. 

so the analog input reading is false???

[Dennis_Knutson]

Your answers are very vague. You still have not provided the details on your wiring. Provide the actual pin numbers of your connections. And saying you used a default is meaningless. Do you have it configured as differential or rse.

[papacode]

on pxie-1062 the pxie-8360 is connected to slot one.

the pxie-8360 is connected to pci card in the pc.

on pxie-1062 the pxie-6358 is connected in slot 4.

the pxie-6358 is connected via cableshc68-68-epm to bnc-2090A

on the bnc-2090a the AO0 connector is feed direct to AI0 via bnc cable.

in the test panel is select analog output. the channel selected is dev1/ao0, mode: voltage sinwave, transfer mech: default, rate:10000,freq: 10hz {{Verified works}}

on analog input tab the channel dev/ai0 is selected, mode:continuous, input conf: Differential (default, cant change)

rate is 10000hz samples is 1000: i get one sine period in the chart with amplitude 0.035V.

[papacode]

more interesting if i apply 5v.  see attached.

[Stop_Luke_and_Listen]

Have you tried analyzing the analog output at the ai0 input terminal with an oscilloscope?

[papacode]

yes, the scope shows exaclty what i request on the analog output.  the ai0 does not.

[Stop_Luke_and_Listen]

Have you tried using a different cable to connect the output to the input?