Part 2

41 2 Plug-In Assembly ConfigurationSimplified OperationThe 100 kHz reciprocal counter has five main operational modes: count up, countdown, period measurement, pulse width measurement and pulse output. Each opera-tion is summarized, with the counter at factory settings. By using the switch andjumpers on the counter card, you can set the counter for a wide variety of configurationsfor each of these operations. See Figure 99 for a summary of the five modes.Count UpIn count up, the counter counts up (totalizes) a number of input pulses (up to999999) from a programmable start point (0 to 999999). At any time after thecounter starts counting up, the totalized counts can be displayed on the front panelor sent to the controller.If the total count in the counter exceeds 999999 counts, an overflow condition occursand the counter generates a level change output at the OUTPUT HlGH terminal.If interrupt on overflow has been enabled, the counter sends an interrupt to the3497A status register to set bit 1 (digital interrupt).Count DownIn count down, the counter counts down a number of input pulses (999999 countsmax) from a programmable start point (0 to 999999). The counter stops at 0 unlessstart point is 000000. If the start point is 0, counter "wraps around" and countsdown from 999999 (million counts maximum).After the counter has started the count down operation, you can display the ndmberof remaining counts on the front panel or send this data to a controller. The countercan be programmed to send an interrupt to the 3497A when zero count is reached.Also, when a zero count is reached, a level change output is available at theOUTPUT HlGH terminal.Period MeasurementIn period measurement, the counter can measure one period or average 100 or 1000periods of input signals which have frequencies up to 100 kHz. Input signal triggeringcan be selected from rising edge to rising edge or falling edge to falling edge. Withappropriate settings of the counter, you can measure the periods of input signalswith frequencies from 0.0001 Hz to 100 kHz (periods from 0.00001 sec to 10,000sec).Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com