Larson Davis 824 - Page 626

E-6 824 Reference Manual 9/29/09
Table E-7: LOG Memory Usage Worksheet
Line Interval Memory Calculation
Bytes Used Bytes Needed
7
Basic Interval Record
34
8
Intv Save Ln's
18
9
Intv Save Ln Table
384
10
Wind/Tach=[Yes]
5
11
TOTAL
Bytes / Intv
Sum lines 7to 10
12
Anticipated Intv / Day
Enter Number Calculated
13
TOTAL
Intv Bytes / Day
Multiply lines 11& 12– copy to line 31
Line Daily History Memory Calculation
Bytes Used Bytes Needed
14
Basic Daily Record
175
15
Daily Save 6 Ln Values
18
16
Daily Save Ln Table
440
17
Wind/Tach=[Yes]
19
18
TOTAL
Daily Bytes / Day
Sum lines 14to 17– copy to line 32
Time History Memory Calculation
Line
Resolution Other Level
Bytes per record / Used
19 [1.0dB] [None] 1
20 [0.1dB] [None] 2
21 [1.0dB] [Pk-II|Pk-I |Lmax] 2
22 [0.1dB] [Pk-II|Pk-I |Lmax] 4
23 [1.0dB]
[Advc]
1 plus number of
3
(enabled levels)
Calculate
24 [0.1dB]
[Advc]
2 plus 2 times each
3
(enabled levels)
Calculate
25 [1.0dB]
[Advc]
Wind/Tach=[Yes] 2
26 [0.1dB]
[Advc]
Wind/Tach=[Yes] 4
27
TOTAL
bytes / Hist Record
Select the appropriate number of bytes
from lines 19to 26above
28 Hist Records / Day
24 hours divided by Hist Period in hours
Enter Number Calculated
i.e. 24/(60 sec/3600 sec per hour)=1440
29
TOTAL
Hist Bytes / Day
Multiply lines 27& 28– copy to line 33
Line
Memory Use per Day Calculation
Bytes
30
Exceedance History bytes / day
from line 6
31
Interval History bytes / day
from line 13
32
Daily History bytes / day
from line 18
33
Time History bytes / day
from line 29
34
Run Log bytes / day
n = number of Run Log records / day
x 20 =
n x 20 bytes/record
35
Calibration Log bytes / day
n = number of Cal Log records / day
x 17 =
n x 17 bytes/record
36
Setup RAM Registers bytes used
n = number of registers stored
x 506 =
n x 506 bytes/record
37
TOTAL
bytes used / day
Sum lines 30 to 36
38
824's Memory Size

2,000,000
see TOOLS | Memory
Enter total memory shown
39
TOTAL Run Time in days
until out of memory
divide line 38 by line 37