Ultra Start 15xx Manual de usuario Pagina 117

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A-7
Memory Usage in the TDC Ultra
The TDC Ultra has a large amount of memory to store the data from your
studies; the standard counter comes with 128K of flash memory. This
memory can hold many different studies and it is unlikely that you will fill
the memory before you download the data to your computer.
There are 10 different studies in the TDC Ultra, and each uses a different
internal format to store the data. The following guidelines are provided to
give an idea of how much memory is used by each study type.
Five of the studies (Standard Turning Movement, Classification, Gap, In-
tersection Delay, and Roundabout) store a fixed number of bytes at regular
time intervals (although the number of bytes stored each interval and the
intervals themselves vary considerably). The memory usage in these studies
is fairly easy to calculate, since it is totally a function of the length of time
you do the study. If you know how long you plan to collect data, then you
can calculate how much memory it will take.
The remaining studies (Saturation Flow Rate, Stop Sign Delay, Spot Speed,
Enhanced Turning Movement and Time-Stamp) store data (roughly speak-
ing) on a per vehicle basis. The memory used depends on the volume of
vehicles rather than the length of time.
The table below is a guide to help you determine if you have enough mem-
ory in the TDC Ultra to do the study you want. Only use the chart to get a
rough estimate. If it seems close, then you should arrange to download the
TDC Ultra before doing the study.
If you run out of memory during a study, nothing serious happens. The
TDC Ultra simply displays a message saying that the memory is full. No
data from previous studies are ever lost.
Standard Turning Movement, Roundabout Movement,
Classification & Gap.............75 intervals for every 1% of memory
Intersection Delay.................300 intervals for every 1% of memory
Enhanced Turning Movement, Sat. Flow, Stop Sign Delay,
Time Stamped........................400 cars for every 1% of memory
Spot Speed..............................800 cars for every 1% of memory
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