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It's also worth noting that when I generate a square wave, it overlaps with the trigger pulse exactly.

This may be a clue. It would be logical to use the same squarewave signal for both.

The better question might be, "How is the sinewave generated from the square?" If this is done by look-up table, for example, then the trigger point could be any point on the waveform and a non zero-crossing choice would be strange.

I had a look for a random signal generator manual and foun the TTi TGA1240 Series 40 MHz Arbitrary Waveform Generator which states:

Waveform sync

 

A sync marker phase coincident with the MAIN OUT waveform of that channel. For standard waveforms, (sine, cosine, haversines, square, triangle, sinx/x and ramp), the sync marker is a squarewave with a 1:1 duty cycle with the rising edge at the 0° phase point and the falling edge at the 180° phase point.

At least this one works as you expect.

It's also worth noting that when I generate a square wave, it overlaps with the trigger pulse exactly.

This may be a clue. It would be logical to use the same squarewave signal for both.

The better question might be, "How is the sinewave generated from the square?" If this is done by look-up table, for example, then the trigger point could be any point on the waveform and a non zero-crossing choice would be strange.

I had a look for a random signal generator manual and foun the TTi TGA1240 Series 40 MHz Arbitrary Waveform Generator which states:

Waveform sync

 

A sync marker phase coincident with the MAIN OUT waveform of that channel. For standard waveforms, (sine, cosine, haversines, square, triangle, sinx/x and ramp), the sync marker is a squarewave with a 1:1 duty cycle with the rising edge at the 0° phase point and the falling edge at the 180° phase point.

At least this one works as you expect.

It's also worth noting that when I generate a square wave, it overlaps with the trigger pulse exactly.

This may be a clue. It would be logical to use the same squarewave signal for both.

The better question might be, "How is the sinewave generated from the square?" If this is done by look-up table, for example, then the trigger point could be any point on the waveform and a non zero-crossing choice would be strange.

I had a look for a random signal generator manual and foun the TTi TGA1240 Series 40 MHz Arbitrary Waveform Generator which states:

Waveform sync

A sync marker phase coincident with the MAIN OUT waveform of that channel. For standard waveforms, (sine, cosine, haversines, square, triangle, sinx/x and ramp), the sync marker is a squarewave with a 1:1 duty cycle with the rising edge at the 0° phase point and the falling edge at the 180° phase point.

At least this one works as you expect.

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It's also worth noting that when I generate a square wave, it overlaps with the trigger pulse exactly.

This may be a clue. It would be logical to use the same squarewave signal for both.

The better question might be, "How is the sinewave generated from the square?" If this is done by look-up table, for example, then the trigger point could be any point on the waveform and a non zero-crossing choice would be strange.

I had a look for a random signal generator manual and foun the TTi TGA1240 Series 40 MHz Arbitrary Waveform Generator which states:

Waveform sync

A sync marker phase coincident with the MAIN OUT waveform of that channel. For standard waveforms, (sine, cosine, haversines, square, triangle, sinx/x and ramp), the sync marker is a squarewave with a 1:1 duty cycle with the rising edge at the 0° phase point and the falling edge at the 180° phase point.

At least this one works as you expect.