Larson Davis 824 User Manual

E-4 824 Reference Manual 9/29/09
Table E-6: Example LOG Memory Usage Calculation:
Time History Memory Calculation
Line
Resolution Other Level
Bytes per record / Used
16 [1.0dB] [None] 1
17 [0.1dB] [None] 2
18 [1.0dB] [Pk-II|Pk-I |Lmax] 2
19 [0.1dB] [Pk-II|Pk-I |Lmax] 4
20 [1.0dB]
[Advc]
1 plus number of 3
(enabled levels)
Calculate
21 [0.1dB]
[Advc]
2 plus 2 times each
3
(enabled levels)
Calculate
A Leq & Max, C
Leq & Max
8

22
TOTAL bytes / Hist Record
Select the appropriate number of bytes
from lines 16 to 21 above
8
23 Hist Records / Day
24 hours divided by Hist Period in hours
Enter Number Calculated
i.e. 24/(60 sec/3600 sec per hour)=1440
1,440
24
TOTAL
Hist Bytes / Day
Multiply lines 22 & 23 – copy to line 28
11,520
Line
Memory Use per Day Calculation
Bytes
25
Exceedance History bytes / day
from line 5
18,720
26
Interval History bytes / day
from line 11
1,368
27
Daily History bytes / day
from line 22
312
28
Time History bytes / day
from line 29
11,520
29
Run Log bytes / day
n = number of Run Log records / day
2 x 20 =
n x 20 bytes/record
40
30
Calibration Log bytes / day
n = number of Cal Log records / day
1 x 17 =
n x 17 bytes/record
17
31
Setup RAM Registers bytes used
n = number of registers stored
0 x 506 =
n x 506 bytes/record
0
32
TOTAL bytes used / day
Sum lines 25 to 31
31,977
33
824's Memory Size

2,000,000
see TOOLS | Memory
Enter total memory shown
2,047,485
34
TOTAL Run Time in days
until out of memory
divide line 38 by line 37
64 days

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English