generate a sine wave but receive a square wave

[Jeremy-ho]

I used a AFG1022 to generate a continuous sine wave. But I received a square wave with PXI-6366 as the picture shows when I set the amplitude of the wave 4vpp. And when I set the amplitude of the wave 1vpp, I can receive nothing. I want to know why I receive square wave when the input signal is sine wave.

[altenbach]

How many points do you have per cycle?

[Jeremy-ho]

the waveform is 100Hz. sample rate is 1000Hz. number of per channel is 1000.

[Jeremy-ho]

it is not a square wave. now I find that is a trapezoidal wave.

[crossrulz]

What amplitude are you outputting?  This looks a lot like clipping.  So if your DAQ is setup for a +-5V signal, but you are outputting a larger signal (like +-10V), you will get a waveform much like what you are seeing.

[Minions]

Check your Arbitrary waveform generator settings.  Check which Impedance the ARB is driving.  When it is set to 50-ohms and the input it is actually driving is high impedance, it will essentially double the amplitude of the waveform.  A 10Vpp will become a 20Vpp.  Likewise, a 4Vpeak setting will become a 8Vpp then 16Vpp with the wrong impedance setting.  Know how your equipment works as sometimes it could damage devices downstream.

[altenbach]

Can you zoom into a single period and set the graph to also show the data points (not just lines).