HV on S0 turned down to 950 V S0 rate = 75 Hz S0 plugged into both S0 and S2m inputs to DVCS trigger. Expect HRS-Singles rate (T10) equal to S0 rate But HRS-singles rate from DVCS trigger is 8 times lower than S0 (9 Hz) Is there a Busy inhibit on HRS-singles? This is supposed to count ALL the triggers, not just those accepted.