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 AMPTEC RESEARCH 
620A-4R Low-Ohms Explosive Ordinance Safe Digital Igniter Tester Ohmmeter 620A-4R |
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Ultra-Safe Resistance and Circuit Continuity Tester for Squibs, Bombs, Detonators and Other Explosive Devices
The AMPTEC 620A-4R is also the only Igniter Circuit Tester that is MIL STD 810 Method 511F Explosive and VolatileAtmosphere Certified |
AMPTEC 620A-4R Fail Safe Igniter Tester
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Totally isolated from the Power mains during measurement conditions~ No possibility of Ground Loop Currents
US Air Force Approved by Non-Nuclear Munitions Safety Board |
 Fail Safe Current 8mA Maximum
4 Resistance Ranges: 20Ω-200Ω-2KΩ-20KΩ
0.001mΩ Resolution (1milli-ohm))
Battery Powered ~ Portable
200V AC-DC Measurement Option
3’ Drop/Impact Tested
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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
Waterproof
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The AMPTEC 620A-4R Ruggedized Ordinance Safe Igniter Tester Low Ohmmeter
The AMPTEC 620A-4R Low Resistance Explosive Safety Igniter Tester is a portable Ordinance Digital Milli-Ohmmeter which has been specifically designed for ultra-safe resistance testing on Electronic Explosive Devices(EEDs), e.g., squibs, igniters, flares, detonators, warheads. The 620A-4R’s circuitry has been analyzed and approved by the USAF Munitions Safety Board and many U.S. Gov. Safety Boards as well as most branches of the armed forces for specific military programs.
USAF Non-Nuclear Munitions Safety Committee Approved
The 620A-4R Water Resistant Safety Ohmmeter (Igniter Tester) internally is identical to the US Air Force Munitions Safety Board approved AMPTEC 620A-4 Igniter Tester circuitry. The advantage is the AMPTEC 620A-4R is a ruggedized, water-resistant, portable digital ohmmeter which have been specifically designed for ultra-safe resistance testing on explosive devices (i.e. squibs, igniters, flares, detonators). The 620A-4R case is water proof when closed to a depth of 3 feet. The 620A-4R also floats in water. Since it has silicon boot seals over all of its switches, it can even be operated outside in direct rain.
Link to Safety Approval Test Reports |
Safety First in Testing Ordinance Circuits 
The 620A-4R Explosive Safety Igniter Tester was developed by AMPTEC to advance and modernize ultra-safe testing of explosive ordinance devices associated with most missile and aircraft programs. AMPTEC’s 620A-4R not only provides greater accuracy and resolution than older, obsolete igniter testers, e.g., Alinco 101BFG or the Simpson 4000ITS, it additionally advances safety features previously unavailable. There are a number of critical military, commercial aerospace, and aircraft applications that use squibs, EEDs (electronic explosive device), detonators, explosive bolts, and a number of other types of explosive/blasting devices. It is critically important that these devices detonate when properly triggered. It follows that it is of paramount importance to know for certain that the integrity of the ordinance firing circuit continuity is indeed intact. It is also critically important that these devices do not detonate while being tested for wiring continuity/integrity. AMPTEC RESEARCH manufactures each instrument (Igniter Tester) with redundant, dual fail-safe protection which includes current limiting and resistor network circuitry that limits and insures that the instrument test currents cannot exceed specified amounts which are usually several orders of magnitude lower than the required firing current. Even in the unlikely event of a worst case component failure, the output current limiting network is still in effect. |
Ultimate Safety Isolation for Ground Loop Prevention
The 620A-4R Portable Igniter Tester is battery powered to insure measurement isolation from the power mains to prevent potentially harmful ground current loops. Safety doesn’t stop there. AMPTEC additionally designed a charger lock-out feature that guarantees the 620A-4R’s measurement circuits are always isolated from the charging connections. With the Power switch in the ‘Off’ position the charger is connected to the internal batteries but not the measurement circuitry. With the Power switch in the ‘On’ position, the charger is disconnected from the batteries and the batteries are connected to the measurement circuitry. With this ‘either/or’ there is no possibility of introducing a potential ground loop. |
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Measure On The Go - Sunshine or In The Rain
The AMPTEC 620A-4R internal packaging and impact resistant case is constructed to comply with water tight standards. The polypropylene case is water proof when closed (and purge valve is shut) to a depth of 3 feet. The AMPTEC 620A-4R Explosive Safety Igniter Tester also floats in water. The waterproof overlay covers a unibody aluminum front plate mounted on a water-resistant compressed o-ring in bezel construction. The Super-Bright LEDs are 5 times brighter (25,000 lumens) that normal “high intensity” LEDs, consequently the AMPTEC 620A-4R display is easily read outdoors in sunlight.
‘Can be Operated Outside in Direct Rain as 620A-4R has Silicon Boot Seals Over All Switches Along with The Sealed Front Panel and Front Panel Overlay’ |
AMPTEC RESEARCH P/N 620A-4R-200V-290-401 is a package designed to support the Boeing C17 Aircraft Ground system consisting of 1ea. 620A-4R Igniter Tester, 200V opt., 620-290 lead set, 620-401 lead set, Battery Charger, Operator/Maintenance Manual.
NSN-7035-04-239-4400 National Stock Number includes a 620A-4R and an Option 290 alligator clip lead set.
Approved by Boeing for Testing the Boeing C-17 Transport and the Boeing 777 Aircraft Fire Control System |
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Automate Your Ordinance Testing with AMPTEC's Ultra-Opto-Isolated RS232 Interface
All of the AMPTEC 620A Series Igniter Circuit Tester ( AMPTEC 620A-4R, 620ES, 620BH, 620RK etc.) can be safely operated remotely with complete safety confidence via the "optically isolated RS232C interface" option. The AMPTEC's optically isolated serial interface allows complete remote control (i.e. change to the desired range). Remote reading of the actual igniter (squib) resistance is completely controlled by the serial interface of a PC (i.e. COM2 port). For safety purposes, the optically coupled interface is designed to be electronically isolated (protected) and will withstand up to 5,300 VRMS input or output via the Option "232" isolated serial interface. In addition the Option "620-232" the RS232C Remote Control Serial interface includes a rear panel Gold Plated 4 Wire Terminal strip (Voltage high, Currrent high, Voltage low, and Current Low) which is wired in parallel with the unit's front panel measurement input jacks.
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Please-mail ATEquip.com for Product Availability or a Price and Delivery Quotation. Thank you. 
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AMPTEC RESEARCH 620A-4R SPECIFICATIONS |
Resistance Ranges: |
20Ω |
200Ω |
2KΩ |
20KΩ |
Resolution: |
1mΩ |
10mΩ |
100mΩ |
1Ω |
Fail-Safe Current (Max.): |
<8mA |
<1.8mA |
<180mA |
<20mA |
Accuracy: |
20Ω ~ 20KΩ |
± 0.02% reading ± 0.02% range |
Display: |
4½ digits (19999) Super-Bright LED - 19999 counts. Display is visible in direct sunlight. |
Temperature Coefficient: |
±.002% per °C (from 0°C to15°C and 35°C to 50°C) |
Temperature Range: |
0 ºC to 50 ºC (Operating) |
Terminal Configuration: |
Four-wire Kelvin - Gold 5 Way Binding Posts accept banana jacks, spade lugs, bare wires, etc. |
Overload Indication: |
Display Flashes |
Maximum Input: |
250V DC or peak AC without damage |
Temperature Range: |
0 ºC to 50 ºC (Operating) |
Display Update Rate: |
Approximately 3 per second |
Interface Option: |
Opto-Isolated RS232 |
Max Internal Voltage: |
4.8 VDC - 4 ea. 1.2V Ni-CADS |
Power: |
Rechargeable Ni-Cad batteries (5.0 AHr.) & Charger (115VAC 50-60Hz) |
Charger Mode: |
Battery Operation Disabled Automatically |
Size: |
235mm/9" D x 254mm/10" W x 76mm/3" H |
Weight: |
1.6 KG/3.5lbs NET 3 KG/6.5 lbs shipping |
Link to Ordering Information 620A-4R Ordering Information Link to Ordering Information
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Ampte Research 620A-4R Low-Ohms Explosive Ordinance Safe Digital Igniter Tester Ohmmeter 620A-4R |
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