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This Chapter provides the Operator with detailed instructions on connecting the gauges to the
MicroTrap™ VOD/Data Recorder and setting the MicroTrap™ VOD/Data Recorder hardware to
record the voltage signals produced by the gauges.
5.1 Introduction To Recording DC Voltage Signals
The
MicroTrap™
with optional
channel can be used to record
VOD
data the triggering of the MicroTrap, when set on INTernal triggering, is controlled by the
recording
data are provided in the
VOD
The
MicroTrap™
and is specifically designed to be used with gauges, power supplies and signal conditioning equipment producing
total DC voltage signals in the range of –10 to +10 VDC. As previously explained in
individually programmed to accept a variety of uni-polar or bi-polar voltage ranges. The 0-2.5, 0-5 and 0-10 volt ranges refer to the uni-
polar setting commonly used to measure slowly changing events such as temperature recordings. The -2.5 to 2.5, -5 to 5 and -10 to 10
volt input ranges refer to the bipolar mode which is frequently used to record faster events such as explosion & detonation pressures, blast
vibrations, over-pressures, air blast, strains, etc.
The
MREL MicroTrap™
is commonly used to record voltage signal inputs from commercially available sensors such as:
•
Tri-axial Geophones and Uni-axial Velocimeters for recording vibration data.
•
Tourmaline gauges for recording high pressures associated with shock, such as underwater blasts.
•
Carbon Resistors for recording very high pressure signals in harsh environments, such as cross-borehole propagation.
•
PVDF transducers to measure detonation pressures.
•
Thermocouples to measure temperatures.
•
Various PCB sensors to measure blast overpressures or accelerations.
Some types of sensors require an excitation signal to operate. In this case, the appropriate amplifier or signal conditioner must be used in
conjunction with the sensor.
The
MREL Data Acquisition Suite
Suite
includes menu functions that allow the User to apply equations to the voltage data in order to convert it into a graph of proper
engineering units (versus time). The User has the freedom to choose any engineering unit that corresponds to his or her sensor data.
5.2 Connecting Gauges To The MicroTrap™
The equipment and supplies that are required to record voltage signals from gauges are:
1.
The
MREL MicroTrap™ VOD/Data Recorder VOD/Data
2.
Up to 4 Sensors and 1
3.
Coaxial Cable
(type RG-58 is recommended) of sufficient length to run between the
sensors.
4.
Wire Cutters and Electrical Tape.
Scope Upgrade
is capable of recording DC voltage signals on up to 4 channels. Additionally, the
VOD
data simultaneous with the recording of voltage signals. When simultaneously recording voltage and
MicroTrap™ Operations
automatically displays the recorded data in graphs of voltage versus time. The
VOD
Probe.
M i c r o T r a p ™ M a n u a l d e O p e r a c i o n e s - E d i t i o n 3 . 0
Over view
Manual.
Chapter
Recorder.
VOD
channel. Details on the procedure for
1.4, each of the Scope channels can be
MREL Data Acquisition
MicroTrap™ VOD/Data Recorder
VOD
and the
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