MicroTrap™ Operations Manual - Edition 4.4
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4.6 MicroTrap™ Setup Procedure For VOD Measurements
Once the VOD probe has been placed in the explosive and connected to the RG-58 coaxial cable running to the VOD input on back of
the MicroTrap™ VOD/Data Recorder, the User may now prepare it for recording. The procedure to record a new VOD test consists of the
following steps:
1. Ensure that the coaxial cable coming from the PROBEROD or PROBECABLE is connected to the MicroTrap™ VOD/Data Recorder
signal input connector labeled VOD.
2. Turn the MicroTrap™ VOD/Data Recorder ON. The STATUS light will illuminate and begin to flash quickly for approximately 2
seconds while the recorder conducts some internal verification testing. If the recorder passes the internal verification tests, the STATUS
light will begin to flash slowly (Stand-by mode). The User can go on to Step 3. CAUTION: Do not turn OFF the MicroTrap™ VOD/
Data Recorder until after the internal verification testing has been complete or an unrecoverable error can occur and the unit may be
required to be sent in for service. If the MicroTrap™ fails to pass the internal verification tests, the STATUS light will flash three times
in succession and EE will appear on the LED. If this happens, switch the MicroTrap™ OFF, wait 10 seconds, and switch it on again.
If the MicroTrap™ continues to fail the internal verification tests, then contact MREL as the MicroTrap™ VOD/Data Recorder requires
service.
IMPORTANT
If the you do not wish to keep the existing data in memory, then you can either clear the MicroTrap™ VOD/Data
Recorders internal memory using the DAS™ Data Acquisition Suite Software or by following this procedure:
a. Turn ON the MicroTrap™ VOD/Data Recorder.
b. Press the NEXT TEST button to put the MicroTrap™ in Active mode. The STATUS light should be on.
c. Simultaneously press the NEXT TEST and STOP buttons and hold them down. The LED will display a blinking
dE. Release the buttons.
d. Simultaneously press the START and STOP buttons and hold them down. The LED will display dE without
blinking. Release the buttons. All of the data in the MicroTrap™’s memory will be deleted.
e. Turn OFF the MicroTrap™ VOD/Data Recorders. Turn ON the MicroTrap™ VOD/Data Recorder and pressing
the TOTAL TESTS button and then the REMAINING TESTS button will confirm that these numbers are equal
and that all of the test data in the MicroTrap™ VOD/Data Recorders memory has been deleted.
IMPORTANT
MREL recommends a Trigger Level of about 95% and a Pre-Trigger Time of about 25% for VOD recording of
explosives samples and explosives in blastholes.
MREL recommends setting the Number of Tests = 1 for VOD recording of blastholes using PROBECABLE. The
Operator will normally be able to download the data from the MicroTrap™ VOD/Data Recorder to a computer before
conducting the next VOD test.
MREL recommends setting the Number of Tests = 16 for VOD recording of samples of explosives using a PROBEROD.
This reduces the quantity of data collected per test and conserves the computer’s disk space. At a 2 MHz recording
rate, a MicroTrap™ VOD/Data Recorder with standard memory will record for a total of 131 ms per test if the Number
of Tests = 16. This is more than sufficient recording time for a sample of explosives
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