3458A S/N US28031584. I'VE SELECTED ACV, SETACV SYNC, LF FILTER ON, RES .002. I'M USING THE 3458A TO ADJUST A PRECISION VOLTAGE SOURCE. THE 60Hz SOURCE OUTPUT IS GOING FROM STANDBY TO OPERATE AT 150Vrms; BACK TO STANDBY; TO OPERATE AT 750Vrms. THIS SEQUENCE IS REPEATED TO ADJUST THE SOURCE RANGE. THE PROBLEM I'M HAVING IS THAT THE 3458A ISN'T TRIGGERING TO GENERATE THE SMPL LIGHT. I'VE WAITED FOR 2 TO 5 MINUTES WITH NO SMPL LIGHT. WHEN I QUERY ERR, I GET ERR 102 ,ERR 104, AND 0 ERR, THEN THE 3458A STARTS TRIGGERING. HOW LONG SHOULD A MEASUREMENT TAKE?