Problem: BNC not connected
Problem: in Classic, box not checked (Top right green HTS and Sweep)
Problem: could be Base System GEP with trigger set to Internal.
Solution: Set trigger to External.
Problem: On ROSS1000 and ROSS2000, if the trigger level is too low, the logic module may detect a trigger, but the ramp module does not actually trigger.
Solution: Increase the voltage level of the trigger. Check it with a scope. We have seen trigger sources that fail to generate the reported voltage. The recommended voltage is TTL, which should be at least 3.0 volts when connected to the trigger input.