Hoping someone can help. I have an external time base (10 MHz) which I have connected to the time base input connector. I have checked that the time base jumper on the LF loop assembly is in the 10 MHz position. With a frequency counter on the time base output connector, I do not see any change in the frequency when the external time base is connected as there is no change in the generator output frequency (there is approx 20 Hz difference between the internal and external time bases). I cannot find any information regarding the min/max levels of external time base voltage the 8656A requires. Can anyone offer some helpful advice please?
Greg