On Sun, Mar 31, 2024 at 04:09 AM, Adam R. Maxwell wrote:
With 7A26 on 0.5V/div, EXT trigger displays a stable waveform with a 1.25 Vpp
square wave. INT trigger displays a stable waveform with 2Vpp from the FG502.
With the 7A26 on 1V/div, EXT works with 1.25Vpp, but INT requires 4Vpp to
display the waveform. I do not understand this interaction with the vertical
amplifier, but the INT trigger only gives a stable waveform if the signal is
4x the vertical V/div setting. EXT only requires 1.25 Vpp.
Adam,
In the 7A26 all attenuation is done is by the input attenuators. Hence after that the same signal is sent to the Vertical amp chain and the trigger amp chain. This means that the signal amplitude at the CRT is important for triggering. In both cases you mentioned here the amplitudes at the CRT are the same.
Albert
