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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Steve, Thanks for your comments. I have checked the pertinent information you indicated and found the firmware revisions were 503A-230 and 503B-3.0. The number of counts used to calculate the Chi ratio were the 32 counts displayed as the instrument standard count was taken. The number of seconds for each count was determined by the firmware (16 sec as you indicated). The counting time was 32 sec for unit 706 and 16 sec for unit 3521. The standard count determined by the instrument was the same as the manually calculated average of the 32 readings recorded in all instances. A recent standard count taken with unit 706 set to 16 sec count time produced an instrument Chi ratio of 1.12 and a calculated Chi ratio of 1.59 which is consistent with previous results. My concern is that all the calculated Chi ratios are outside the recommended operating range for the instrument (0.75 - 1.25) which I suspect affects the repeatability of the readings. Gregg __________________________________________ > Gregg Dill, P.Eng., Irrigation Specialist > Alberta Agriculture, Food and Rural Development > Agriculture Center > 100, 5401 - 1st Avenue South > Lethbridge, Alberta, Canada T1J 4V6 > Telephone +1 403-381-5136 FAX +1 403-382-4526 >______________________________________________