Key Digital ES381 User Manual download pdf (Page 18)

Green means the reading is done.

Red means the reading over-flowed i.e. external period too long or

external frequency too high. Try a shorter internal period or lower

internal frequency.

If the counter waits for more than 2 seconds whilst in Period mode

and no external signal has been detected, the indicator will blink

rapidly white-grey-white-grey etc.

Elan Digital Systems Ltd. 18 USBcount50 USER’S GUIDE Iss1

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Key Digital ES381 User Manual Page 18