| ??? 07/22/09 14:23 Read: times |
#167695 - i'm sorry Responding to: ???'s previous message |
If used prescaller is 1k and timebase is 1 sec, when measured is F=1GHz -
micro will count 1M pulses+/-1 pulse , lost will be in wors case 0.99 pulses. So on display will be, say D=999,999 x 1k =999,999,000 Hz. (F-D)/F= 1000/1,000,000,000=1/1000,000=1/10000 percent. I'm wrong? |
| Topic | Author | Date |
| Frequency Counter using prescaler | 01/01/70 00:00 | |
| Find prescaler. Then find time period. Then multiply count. | 01/01/70 00:00 | |
| Think about crystal stability | 01/01/70 00:00 | |
| Oscillator candidate | 01/01/70 00:00 | |
| i wish that would become clear to the majority | 01/01/70 00:00 | |
| 0.1 % | 01/01/70 00:00 | |
| I'm sorry? | 01/01/70 00:00 | |
| i'm sorry | 01/01/70 00:00 | |
| Clearer now | 01/01/70 00:00 | |
| Dividers increase the error, but... | 01/01/70 00:00 | |
| if extreme precision is required ... | 01/01/70 00:00 | |
| or count more seconds | 01/01/70 00:00 | |
| Remember resolution != precision :) | 01/01/70 00:00 | |
Excellent - responses thanks so much | 01/01/70 00:00 |