hi all, I have a sencore scope that has started acting up. when I hook up a probe to either chanel a or b I get a 160mvpp signal at 2.4khz. have tried different probes, even just a straight wire, with the same results.this occurs with no connection to anything. can someone help. have checked filters in power supply. are o.k. I have another scope to use for troubleshooting. it seems like the probe wire is acting like an antenna. help plz.