Key Digital ES381 User Manual
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