I am, with kind remote assistance, investigating display noise on an old HP8568B spectrum analyser. I am using an even older Tektronix 7854 storage `scope,. I am seeing noise spikes only when using the acquire function, they are not clearly visible whilst the `scope is free running. I also tried to look for them with an HP54501A digital scope. This is proving useless to see the spikes, but maybe it's the operator? Before I go further, should I expect to use the digi `scope to see such noise spikes as in the image hopefully attached? I am using a X10 probe, and the Tek `scope does not reflect that in the V/Div reading. Thanks.
The Tek is a 500MHz scope, the HP a 100MHz, and the HP specs are below:
oduct Identifiers
Brand Agilent
Model 54501A
Type Digital
Bandwidth 100 MHz
MPN 54501A
Acquisition System
Sample Rate 10 MSa/s
Memory Depth 501 points
Vertical System
Vertical Sensitivity 5 mV/div to 5 V/div
Rise Time 3.5 ns
Input Impedance 1 M?
Vertical Resolution 8 bits
Time Base System
Time Base Range 2 ns/div to 5 s/div
Time Base Accuracy ±0.005%