Model 820 Technical Reference Manual
Estimating Memory Usage
9-5
17
[0.1dB]
[No]
2
18
[1.0dB]
[Peak|UwPk|Max|Wind]
2
19
[0.1dB]
[Peak|UwPk|Max|Wind]
4
20
TOTAL bytes / Hist Record
Select the appropriate # of bytes from lines
16-19
2
21
Hist Records / Day
24 hours divided by Hist Period in hours
Enter Number Calculate
i.e. 24/(60 sec/3600 sec per hour)= 1440
1440
22
TOTAL Hist Bytes / Day
Multiply lines 23 and 24 - copy
-copy to 29
2880
Line
Memory Use per Day Calculation
Bytes
Bytes
23
Exceedance History bytes / day
from line 5
16520
24
Interval History bytes / day
from line 11
1248
25
Daily History bytes / day
from line 15
193
26
Time History bytes / day
from line 22
2880
27
Run Log bytes / day
n= number of Run Log records / day
2/(nx20) X 20 =
n x 20 bytes/record
40
28
Calibration Log bytes / day
1/(nx17) X 17
n x 17 bytes/record
17
29
Setup RAM Registers bytes used
n=number of registers stored / day
0/(nx506) =
n x 506 bytes/record
0
30
TOTAL bytes used / day
Sum lines 23-29
20898
31
Model 820’s Memory Size (252661)
See SYSTEM-b
251,805
32
TOTAL Run Time in days
until out of memory
Divide line 34 by 33
12.05
Line
Time History Memory Calculation
Bytes
Bytes
