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5.6 Additional Information on Memory
The MicroTrap™ VOD/Data Recorder has a large circular memory containing 4,194,000 data points (doubled with optional memory
upgrade) that are allocated across each of the tests into which the MicroTrap™ VOD/Data Recorders memory has been divided. The total
number of tests and selected recording rate dictate the total record time available for each test. Selection of the number of tests to be
recorded and the Recording Rate is done using the DAS™ Data Acquisition Suite Software.
The DAS™ Data Acquisition Suite Software automatically calculates and displays the Total Recording Time per Test and the Pre-Trigger
Time. Notice that the graphic shown is for a MicroTrap™ VOD/Data Recorder with the optional MicroTrap™ VOD/Data Recorder Memory
Upgrade installed.
For those Operators with additional interest in recording times:
A general equation to calculate the Total Recording Time (Pre-Trigger Time + Post-Trigger Time) is:
Total Recording Time (seconds) = 4,194,000 points / ((# of tests) x (# of channels) x (recording rate))
If the number of tests selected is one, and only one channel is being recorded, the available recording time will be maximized for a given
Recording Rate. For example, at the maximum Recording Rate 1 MHz, the Total Recording Time will be:
4,194,000 points / ((1 test) x (1 channel) x (1,000,000 points/sec)) = 4.194 seconds
At a slower Recording Rate of 500 kHz (for example), the Total Recording Time will become 8.390 seconds. If the MicroTrap™ VOD/Data
Recorders internal memory is divided into 4 tests and there are 4 Scope channels on and VOD is also being recorded, the MicroTrap™
VOD/Data Recorder will partition the memory allocating 4,194,000 points/((4 tests)x(5 channels)) = 209,700 points per test per channel.
Following the previous example, the Total Recording Time per test can be calculated as follows:
4,194,000 points / ((4 tests) x (5 channels) x (1,000,000 points/sec)) = 0.210 seconds per test
If the Recording Rate is reduced to 500 kHz, the Total Recording Time will become 0.42 seconds per test per channel. If these recording
times are insufficient for your testing applications, then contact MREL and ask about the MicroTrap™ VOD/Data Recorder Memory
Upgrade, which doubles the MicroTrap™ VOD/Data Recorders internal memory and thus doubles the Total Recording Time. For slower
phenomena such as temperature, much lower recording rates can be used to allow the MicroTrap™ VOD/Data Recorder to record for
hours.
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