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3. Press the NEXT TEST button; the STATUS light will stop flashing and will remain illuminated (Active mode).
4. Press the TOTAL TESTS button to see the number of tests that the MicroTrap™ VOD/Data Recorders memory has been divided into,
using the DAS™ Data Acquisition Suite Software.
5. Press the REMAINING TESTS button to see the number of memory slots that remain to be filled in the MicroTrap™ VOD/Data
Recorders non-volatile memory. If this number does not equal the number of TOTAL TESTS, then there are one or more tests already
stored in the MicroTrap™ VOD/Data Recorders internal memory. If the value shown on the display is 0, the memory is full and will
need to be cleared prior to conducting further tests.
6. Look for the OUT OF RANGE warning light indicators ( and ). If there is a warning light, there is a problem with the resistance
probe, the coaxial cable, or the BNC Adapter. If this is the case, the User is referred to Chapter 4.7 for possible solutions.The START
button will be blocked and the MicroTrap™ VOD/Data Recorder will be unable to record VODs when an OUT OF RANGE condition
exists. If neither of the OUT OF RANGE lights are illuminated, the User may proceed with the next step.
7. If you intend to use the MicroTrap™ VOD/Data Recorders internal trigger, ensure the EXT/INT TRIG switch is set to the INTernal
position. The use of EXTernal triggering is discussed in Chapter 4.8.
8. Press the START button. The START light will illuminate steadily. The MicroTrap™ VOD/Data Recorder then starts monitoring the
blast, waiting for the trigger signal to start collecting voltage data. Personnel may now vacate the MicroTrap™ VOD/Data Recorder
location if necessary.
9. When the MicroTrap™ VOD/Data Recorders internal triggering criteria is met (i.e. a sufficient length of PROBEROD or PROBECABLE
has been consumed by the detonation), the MicroTrap™ VOD/Data Recorder will begin recording VOD information. Upon triggering,
the TRIG’D light will illuminate and remain on during the collection of data (this time depends on the recording rate and number
of tests programmed into the MicroTrap™ VOD/Data Recorder). During this time, both the START and STATUS lights will also be
illuminated.
10. Once data collection ends, the TRIG’D and START lights flash rapidly and the MicroTrap™ VOD/Data Recorder begins storing data
into its non-volatile memory. During this short time, the STATUS light is illuminated to indicate that writing is taking place. Do not
switch the MicroTrap™ VOD/Data Recorder OFF during this time. This can take up to 45 seconds to download into memory.
11. When the MicroTrap™ VOD/Data Recorder finishes storing the data, the START light will go dark and the STATUS and TRIG’D lights
will begin to flash slowly. The MicroTrap™ VOD/Data Recorder has now returned to Stand-by mode.
IMPORTANT
If the MicroTrap™ VOD/Data Recorder has triggered prematurely, or the data that you have collected is not of use to
you, then you may erase only the last test by performing the following sequence:
a. Do not turn OFF the MicroTrap™ VOD/Data Recorder after the test, the STATUS light and TRIG’D lights should
be flashing.
b. To erase the data from the last test; simultaneously press the TOTAL TESTS and REMAINING TESTS buttons
and hold them until this procedure is complete. The LED display will show ct.
c. After about 2 seconds, the ct will begin blinking. After another 2 seconds, the ct will disappear. Release the
buttons. The data from the last test has been deleted.
d. Turn OFF the MicroTrap™ VOD/Data Recorder, wait several seconds and then turn the MicroTrap™ VOD/Data
Recorder ON again. Pressing the TOTAL TESTS button and then the REMAINING TESTS button will confirm
that the remaining tests have been increased by 1 and that the last test in the MicroTrap™ VOD/Data
Recorder’s memory has been deleted.
NOTE: When the internal triggering criteria are met, the MicroTrap™ VOD/Data Recorder will send a 10 VDC signal to the TRIG OUT
port on the back of the unit. This pulse is 6 seconds in duration, and has a rise time of 2 microseconds. Some Users may wish to
trigger other instrumentation from the MicroTrap™ VOD/Data Recorders TRIG OUT port.
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