The AMPTEC 620VL-T Explosive Safety Igniter Tester - High and Low Ohm Ranges

The AMPTEC 620VL-T Wide Span Explosive Safety Igniter Tester is a portable digital failsafe ohmmeter which has been specifically designed for ultra-safe resistance testing on explosive devices (i.e. squibs, igniters, flares, detonators, warheads).  The 620VL-T is primarily for indoor lab use, the other AMPTEC 630ES and 640SL (Low Resistance Ruggedized Explosive Safety meter) are ruggedized water proof versions with similar test capabilities.  The AMPTEC 620VL-T features five way gold panel jacks that directly accept wiring, spade lugs and banana jacks (i.e. with 4 wire Kelvin Clips).  For a data sheet of all the accessories, test leads, probes and options that are compatible with the AMPTEC 601ES DMM, 620A-4, 620BH, 620ES, 620GD, 620RK etc select here. The AMPTEC 620BH uses the same USAF Munition Safety Board Approved Fail Safe current source for its resistance circuitry. The unit's circuitry reviewed and approvals are pending by many U.S. Gov. Safety Boards as well as most branches of the armed forces for specific military programs.

Wide Span High and Low Ohm Range - Accuracy and Resolution

A common question is “What does AMPTEC offer to improve the measurement accuracy and resolution with a low resistance value squib/detonator measurement/application and also allow isolation testing to 2 Megohms?"  This lead to the development of the AMPTEC 620VL-T Explosive Safety Igniter Tester.  The AMPTEC 620VL-T offers the following fullscale ranges - 20 Ohms, 2.0 KOhms, 20 Kohms, 200 Kohms and 2.0 Megohms. The 20 Ohm fullscale range provides a four-wire Kelvin resistance measurement from 0.000 ohms to 19.999 ohms. The 20 Ohm range also offers a low 1 milliohm resolution. AMPTEC RESEARCH offers an optional Four Wire Kelvin (OP300) Lead set that eliminates the effects of test lead length resistance and contact resistance errors.

Isolation Testing to 2.0 Megohms

The 2.0 Megohm range on the AMPTEC 620VL-T provides a high resistance range for determining open circuit or "electrical isolation between any two contact test points or wires" (>2.0 Megohms) status on ordnance wiring and detonators. See the AMPTEC 620BH if you need to measure isolation resistance to a higher level up to 20.0 Megohms (620BH).

Incredibly Safer than a Commercial DMM

Commercial Multifunction DMM’s have many modes (i.e DC Voltage, AC Voltage, DC current, AC current, frequency, shift keys, Capacitance and more..) that can accidentally mis-measure igniter circuit resistance.  If the DMM has an electrical fault the igniter circuit may accidentally fire.  The 620VL-T Igniter Tester only measures resistance, it is not a complex multifunction DMM. DMMs also aren't optimized for squib resistance measurements, most squibs are around 1.0 Ohm and the AMPTEC 620VL-T Explosive Safety Igniter Tester offers a 20 Ohm full scale range.

Polyurethane Epoxy Conformal Coated Circuit Board and More ...

A common question we get from safety engineers is "What sort of electrical and  mechanical  measures are taken with the AMPTEC 620BH to prevent an internal  loose wire, metal screw, or washer inside from floating around and shorting the battery output to the terminal output posts?".  The entire PCB (except for the calibration trim pots) is non-conductive polyurethane epoxy coated, to make it extremely difficult to get an accidental conductive pathway.  For starters, the 620VL-T Explosive Safety Igniter Tester fundamentally uses the USAF Non-Nuclear Safety Board approved AMPTEC 620A-4 Igniter Tester Failsafe ciircuitry.  The 620BH has the added circuitry of the 2.0 Ohm range which has also been approved by the US Dept. of Energy (High Explosive Safety Committee) in the form of the AMPTEC 630ES and AMPTEC 640SL.  The ultimate electrical safety analysis for failsafe current relies on Ohm's Law for determining Imax based upon a Vmax (~ 4.8 VDC battery value) divided by the equivalent circuit current limiting resistance (R-limit) for the particular version being considered.  The AMPTEC 620A circuit schematics are available upon request for reviewing a version's maximum failsafe current level.

Kelvin Clips , Probes and Test Lead Accessories

Optional 24/7 Continuous Isolated Operating Power - 24 Hours a Day To continually use the AMPTEC 620VL-T,especially in an automated application with a computer would eventually drain any battery powered unit. Option "247" allows the AMPTEC 620VL-T Igniter Tester to be safely operated 24 Hrs/Day 7 Days/Week continuously.  It is based upon the same "Hospital Safety Isolation" technology used in monitoring and diagnosing human patients while wired/connected to 120 VAC powered electrical instrumentation.  This Ultra High Line Isolation DC/DC convertor based option is rated to 3,000 volts isolation._