Ultra-Safe Resistance and Circuit Continuity Tester for Squibs, Bombs, Detonators and Other Explosive Devices

AMPTEC620ES

US Air Force Approved by Non-Nuclear Munitions Safety Board

 Fail Safe Current 8mA Maximum
4 Resistance Ranges: 2Ω, 20Ω-200Ω-200KΩ
100uΩ Resolution (0.1milli-ohm))
 Battery Powered ~ Portable-DLRO
 RS232 Interface Option

 4-Wire Kelvin Lead Sets
 Display: 19999 ~ High Accuracy
 Ultra Power Line Isolation Igniter Testing
 Digital Low Resistance Ohmmeter (DLRO)
 Multiple Optional Probe/Lead Sets

The Amptec 620ES Explosive Safety Igniter Tester
The AMPTEC 620ES Low Resistance Explosive Safety Igniter Tester is a portable digital ohmmeter which has been specifically designed for ultra-safe resistance testing on explosive devices (i.e. squibs, igniters, flares, detonators, warheads).  The 620ES is primarily for indoor lab use, the other AMPTEC model 630ES (Low Resistance Ruggedized Explosive Safety meter) is a ruggedized water proof version.  The AMPTEC 620ES features five way gold panel jacks that directly accept wiring, spade lugs and banana jacks (i.e. with 4 wire Kelvin Clips).  The 620ES has had 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.

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?"  This lead to the development of the AMPTEC 620ES Explosive Safety Igniter Tester.  The AMPTEC 620ES offers the following fullscale ranges - 2.0 Ohms, 20 Ohms, 200 Ohms and 200 Kohms.  The 2.0 Ohm fullscale range provides a four-wire Kelvin resistance measurement from 0.0000 ohms to 1.9999 ohms. The 2.0 Ohm range also offers a low (1/10) 0.1 milliohm or 100 microhm 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.  The 200 Kohm range provides a relatively high resistance range for determining open circuit” (>200 Kohms) status on ordnance wiring and detonators. 

Amptec's 620ES is Incredibly Safer than a DMM

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 620ES Igniter Tester only measures resistance, it is not a complex multifunction DMM. If the 620ES had an electrical fault it offers the life saving advantage of failing safe.  The lowest Ohm range on most DMMs is 200 Ohms. DMMs also aren't optimized for squib resistance measurements, most squibs are around 1.0 Ohm and the AMPTEC 620ES Explosive Safety Igniter Tester offers a 2.0 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 620ES 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 620ES Explosive Safety Igniter Tester fundamentally uses the USAF Non-Nuclear Safety Board approved AMPTEC 620A-4 Igniter Tester Failsafe ciircuitry.  The 620ES 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.

Ultimate Safety Isolation for Ground Loop Prevention