The 190 comes preset to trip once every 24 hours. To adjust this time you have a series of jumpers that must be cut.
REPORT INTERVAL CUT JUMPERS
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1hour ...................ABCE
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2...........................BCE
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3...........................ACE
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4...........................CE
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6...........................BE
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8...........................E
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12.........................CDE
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1 DAYS..................NONE
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2...........................DEF
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3...........................EG
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4...........................DG
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5.......................... FG
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6..........................DEH
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7..........................EFH
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8..........................DFH
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9..........................GH
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10........................DEFGH
The test interval time will then need to be set. There is a black button which is used to zero the clock to the present time, and a red button which is used to advance the timer clock up in hour intervals. Each flash of the LED indicates a one hour increase.