On Fri, Jan 22, 2021 at 11:02 AM, Ozan wrote:
At the back of the scope there is a BNC marked as A-gate. While applying your
sine wave to channel 1, triggering on channel 1, connect A-gate to channel 2.
Pick "chop". Move X-axis to see the beginning of waveforms. You should not see
the rising edge of the A-gate. Similarly if you look at A-sweep (available at
the BNC back of the scope), you should see a linear ramp starting from the
beginning of the trace. If you can see some portion of the A-gate while it is
low or rising, blanking may have a problem. If A-gate is OK but ramp looks
strange then could be something with the ramp.
Hello Ozan
Tried to do what you ask me. I uploaded the pictures of :
- Sine wave + A-Gate in chop mode :
- A-Gate + A-Sweep on the 485 :
- A-Gate + A-Sweep on an Hameg 304 : (ch1:A gate 1V/div, Ch2 : A-sweep : 5V/div)
Comparing last 2 images, it seems to me that A-sweep and A-Gate signals are ok on the 485
But if you have some screen shots to compare, it could help.
Jose
