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MREL GROUP OF COMPANIES LIMITED

5-779 Sir John A MacDonald Blvd. Kingston, Ontario K7L 1H3 Canada

T: +1-613-545-0466       E: [email protected]       www.mrel.com

Operations Manual

Edition 4.4

Summary of Contents for MicroTrap

Page 1: ...MREL GROUP OF COMPANIES LIMITED 5 779 Sir John A MacDonald Blvd Kingston Ontario K7L 1H3 Canada T 1 613 545 0466 E contact mrel com www mrel com Operations Manual Edition 4 4...

Page 2: ...any particular purpose The Customer assumes the entire risk as to the results and performance of the product MREL is committed to product innovation accordingly product may undergo specification impro...

Page 3: ...losives in Blastholes 8 2 4 Applications of the MicroTrap with Scope Upgrade Installed 8 Chapter 3 Hardware 9 3 1 Hardware Components 10 3 1 1 MicroTrap VOD Data Recorder 10 3 1 2 Carrying Case 15 3 1...

Page 4: ...Setup Procedure for VOD Measurements 30 4 7 Probe Resistance Out of Range Lights 32 4 8 Utilizing the External Trigger 33 4 9 Additional Information on Memory and Triggering 33 4 9 1 Memory 33 4 9 2 T...

Page 5: ...T 1 613 545 0466 www mrel com contact mrel com 1 Chapter 1 Getting Started...

Page 6: ...istance probes VOD PROBERODs and or VOD PROBECABLE and or VOD PROBECABLE LR Optional 1 1 MicroTrap Hardware Included All of the steps detailed in this Chapter should be completed before the Operator g...

Page 7: ...capture the test which includes the amount of Pre Trigger Time and the Total Time Recording Rate is the number of points captured per second The faster the Recording Rate the shorter the amount of tim...

Page 8: ...M i c r o T r a p O p e r a t i o n s M a n u a l E d i t i o n 4 4 4...

Page 9: ...T 1 613 545 0466 www mrel com contact mrel com 5 Chapter 2 Introduction...

Page 10: ...S Data Acquisition Suite Software for more information The main features of the MicroTrap VOD Data Recorder for VOD recording are One VOD channel capable of recording at up to 2 MHz 2 million data poi...

Page 11: ...on voltage or signal Standard and common sense rules apply when it comes to the presence of electrical storms near the testing area Due to the inherent hazards associated with blasting during these st...

Page 12: ...f stemming material to be used between decks of explosives to prevent sympathetic detonation or explosive desensitization from occurring 2 4 Applications Of MicroTrap with Scope Upgrade Installed As p...

Page 13: ...T 1 613 545 0466 www mrel com contact mrel com 9 Chapter 3 Hardware...

Page 14: ...e MicroTrap VOD Data Recorder hardware are provided in Chapter 4 The main features of the control panel are outlined below MAIN CONTROL PANEL Power The ON OFF switch is used to provide power to the Mi...

Page 15: ...nced operations are being performed Battery Level The BATTERY STATUS button is pressed to display the battery level on the LED screen The MicroTrap VOD Data Recorders battery level is displayed in int...

Page 16: ...e remaining tests have been increased by 1 and that the last test in the MicroTrap VOD Data Recorders memory has been deleted Trigger Selection The TRIG EXT INT switch selects internal INT or external...

Page 17: ...ta in the MicroTrap VOD Data Recorders memory in the absence of a PC This can be performed in the following steps 1 Turn ON the MicroTrap VOD Data Recorder 2 Press the NEXT TEST button to put the Micr...

Page 18: ...rger to recharge the internal battery and to operate the MicroTrap VOD Data Recorder from AC mains power The DC IN OUT port can also be used to power the MicroTrap VOD Data Recorder from an external 1...

Page 19: ...as been stored in the MicroTrap VOD Data Recorder s memory Otherwise the light will remain off BLACK VENT The black knob on the front of the MicroTrap VOD Data Recorder is an automatic pressure relief...

Page 20: ...ur additional BNC Adapters are provided one for each Scope input channel 3 2 Internal Rechargeable Battery The MicroTrap VOD Data Recorder has an internal Ni Cad rechargeable battery The MicroTrap VOD...

Page 21: ...can be tested as detailed in Chapter 3 3 3 5 Operating The MicroTrap from External Power Sources The MicroTrap VOD Data Recorder can be operated from AC voltage mains power using the Battery Charger...

Page 22: ...wire placed within a small diameter metal tube which acts as the return lead of the circuit PROBERODs are specifically designed to measure VODs of explosive cartridges and or of short sample tubes of...

Page 23: ...as the delay times between holes and decks The selection of either PROBECABLE or PROBECABLE LR is based on the total resistance of the circuit which in turn depends on the number of holes being monit...

Page 24: ...ntal Fully operational at 40 to 60 C 40 to 140 F Snow rain dust and sand proof Drop proof from a height of at least 1 m 3 ft PC Connection After conducting the test s the MicroTrap VOD Data Recorder i...

Page 25: ...T 1 613 545 0466 www mrel com contact mrel com 21 Chapter 4 Recording VOD And Hole Deck Delay Times...

Page 26: ...rs or explosive cartridges It can also measure the VOD of explosives loaded in multiple surface or underground blastholes The MicroTrap VOD Data Recorder provides a regulated constant excitation signa...

Page 27: ...ot touch each other across the connection 4 Note the Unit Resistance of the probe by reading the value in ohm m or ohm ft from the MREL factory label on the PROBEROD Note the ohm m value if the VOD is...

Page 28: ...328 ft MREL Product 1 06 01 Sample of Packaged Explosive VOD PROBEROD or VOD PROBEROD HS MREL Product 1 05 01 or 1 05 11 Detonator Blasting Machine See Figure 1 Place the RG 58 Coaxial Cable beside th...

Page 29: ...ation will be requested later by the DAS Data Acquisition Suite Software When measured with a blaster s galvanometer the Probe Resistance should compare closely with the calculated resistance of the P...

Page 30: ...ie a loose knot down the cables from the connection as shown above Twist the center conductors together Pull the shielding wires back along the cables and start taping from the cable to the end Figure...

Page 31: ...3 Run the PROBECABLE between the first hole and the second hole leaving sufficient slack between the holes to allow for ground movement between the delayed holes Coil the slack cable near the collar o...

Page 32: ...ose of connecting to the MicroTrap VOD Data Recorder VOD input A BNC Adapter is a short length of coaxial cable with a male BNC connector attached to one end and two bare leads on the other The BNC Ad...

Page 33: ...der MREL Product 1 03 01 VOD PROBECABLE MREL Product 1 05 05 RG 58 Coaxial Cable 100 m 328 ft MREL Product 1 06 01 BNC Connector Male Delay between each hole Blasting Machine Stemming Bulk Explosive D...

Page 34: ...a 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 Rec...

Page 35: ...luminate 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 STA...

Page 36: ...ROBECABLE to the probe circuit This will not affect the VOD results If PROBECABLE LR is being used in the test then consider using PROBECABLE for such tests in the future The unit resistance of PROBEC...

Page 37: ...cause the explosive itself generates an electrically conductive plasma in the vicinity of the detonation front that will assist in arcing the current from one wire to the other An example of a BREAK t...

Page 38: ...s in turn reduces the resistance and thus the voltage across the probe decreases from the initial 5 0 VDC approximately set automatically by the MicroTrap VOD Data Recorder When the voltage across the...

Page 39: ...r for sufficient PROBECABLE to be consumed The MicroTrap VOD Data Recorder has a very large memory and a very long Total Recording Time At a Pre Trigger setting of 25 the MicroTrap VOD Data Recorder h...

Page 40: ...M i c r o T r a p O p e r a t i o n s M a n u a l E d i t i o n 4 4 36...

Page 41: ...T 1 613 545 0466 www mrel com contact mrel com 37...

Page 42: ...M i c r o T r a p O p e r a t i o n s M a n u a l E d i t i o n 4 4 38...

Page 43: ...T 1 613 545 0466 www mrel com contact mrel com 39 Chapter 5 Recording Voltage Signals From Gauges...

Page 44: ...als 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 o...

Page 45: ...as into the DAS Data Acquisition Suite Software to convert the graphs of voltage versus time to graphs of the appropriate engineering units versus time 4 Install your sensors in their final positions...

Page 46: ...o fail the internal verification tests then contact MREL as the MicroTrap VOD Data Recorder requires service 3 Press the NEXT TEST button the STATUS light will stop flashing and will remain illuminate...

Page 47: ...ate the MicroTrap VOD Data Recorder location if necessary 9 When the MicroTrap VOD Data Recorders internal triggering criteria is met i e the voltage signal on one of the channels has crossed the trig...

Page 48: ...ggered when the open circuit is closed by the event of interest even if only momentary The traditional BREAK circuit is triggered when the complete circuit is broken even if only momentarily To create...

Page 49: ...ne 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...

Page 50: ...M i c r o T r a p O p e r a t i o n s M a n u a l E d i t i o n 4 4 46...

Page 51: ...T 1 613 545 0466 www mrel com contact mrel com 47 Chapter 6 MicroTrap VOD Data Recorder Software...

Page 52: ...corder power ON NOTE If the USB cable has not been connected prior to turning ON the unit the User MUST wait approximately 5 seconds before connecting the USB cable or an unrecoverable error can occur...

Page 53: ...T 1 613 545 0466 www mrel com contact mrel com 49 Chapter 7 Contacting MREL for Technical Support...

Page 54: ...MREL Group of Companies Limited Blasting Instrumentation Team 5 779 Sir John A MacDonald Blvd Kingston Ontario K7L 1H3 Canada Toll Free 1 877 544 MREL Canada USA Tel 1 613 545 0466 Email support mrel...

Page 55: ...T 1 613 545 0466 www mrel com contact mrel com 51...

Page 56: ...itted to product innovation accordingly product may undergo specification improvements without notice Copyright 2022 MREL Group of Companies Limited MicroTrap VOD Data Recorder MicroTrap VOD Data Reco...

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