Bulletin No. 3020IM9503R6/98 Power Meter
December 1998 Appendix J—Calculating Log File Size
1998 Square D All Rights Reserved 109
In another example, suppose you want to log current and voltage for each
phase every 4 hours for one week and store the last 10 events:
1. Multiply the number of cumulative
energy readings by 4 (registers): 1. ________
2. Enter the number of non-energy
meter readings: 2. ________
3. Add lines 1 and 2: 3. ________
4. Add 3 to the value on line 3.
(For date/time of each entry): 4. ________
5. Multiply line 4 by the maximum
number of records in the data log file
(how many times you are logging
each quantity): 5. ________
6. Multiply the number of events by 8: 6. ________
7. Add lines 5 and 6: 7. ________
This is also a valid log.
0
6
6
9
9 x 6 (per day) x 7 (days) = 378
For example, suppose you want to log cumulative apparent energy every hour
for 2 days and store the last 20 events:
1. Multiply the number of cumulative
energy readings by 4 (registers): 1. ________
2. Enter the number of non-energy
meter readings: 2. ________
3. Add lines 1 and 2: 3. ________
4. Add 3 to the value on line 3.
(For date/time of each entry): 4. ________
5. Multiply line 4 by the maximum
number of records in the data log file
(how many times you are logging
each quantity): 5. ________
6. Multiply the number of events by 8. 6. ________
7. Add lines 5 and 6. 7. ________
This is a valid log because the total does
not exceed 496.
20 x 8 = 160
0
4
7
1 x 4 = 4
24 (hours) x 2 (days) x 7 = 336
336 + 160 = 496
10 x 8 = 80
378 + 80 = 458
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