Key Digital ES381 manual Falling Falling Rising Falling Rising Rising

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2.5.3 Period Mode

Period mode uses an internally generated reference clock to time the period between two edges on the input waveform. It is selected as shown.

The reference clock can be selected from 100MHz, 10MHz or 1MHz. The pair of edges that is timing is measured can be selected from:

FALLING -> FALLING

RISING -> FALLING

FALLING -> RISING

RISING -> RISING

Note that for all practical purposes the first and last listed settings will yield the same answer, but there may be cases where being able to switch between these two settings is useful, in certain PWM waveforms for example.

For most input periods, the 100MHz setting will suffice. It offers a range of 0ns to 2.684s in steps of 10ns ! If you have a very slow input period, then selecting the 10MHz or 1MHz can increase this maximum period to 26.84s and 268.4s respectively, at the expense of timing resolution (down to 100ns and 1us respectively).

Elan Digital Systems Ltd.

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USBcount50 USER’S GUIDE Iss1

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Contents USER’S Guide Contents Software Page Overview General Figure below shows a simplified diagram of the USBcount50 Using More Than One USBcount50 This is a safety critical point so please note it carefully Disassembling The Stack USB Connections For Stacked Configurations USBcount50 USER’S Guide Iss1 Stacking Do’s And Don’ts USBcount50 /MISpc USBcount50 USER’S Guide Iss1 Input Control Counter Modes USBcount50 USER’S Guide Iss1 Frequency Mode Falling Falling Rising Falling Rising Rising USBcount50 USER’S Guide Iss1 Before plugging in the hardware 2 channel example is shown USBcount50 USER’S Guide Iss1 Windows 2K and XP10 13 a 1 channel example is shown USBcount50 USER’S Guide Iss1 Troubleshooting Power Requirements Performance Performance Software
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