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620A-4 | Digital Failsafe Ohmmeter

The 620A-4 Igniter Tester is a failsafe and portable digital ohmmeter specifically designed for ultra-safe resistance testing on squibs, flares, bridge-wire, and other explosive devices. The 620A-4 safety ohmmeter has been approved by the USAF Non-Nuclear Munitions Safety Board for usage on all non-nuclear munitions, and independently certified to meet Mil. Std. 810 Mtd. 511 for usage in fuel-filled environments. Due to its intense self-safety design and numerous certifications, the 620A-4 failsafe ohmmeter is the industry standard for military programs in need of igniter testing.

This item is not available for purchase through our website. Please contact us for more information.

Range 20 Ω 200 Ω 2K Ω 20K Ω
Nominal Current 5 mA .5 mA 50 uA 5 uA
Failsafe Current 8 mA 1.5 mA 150 uA 15 uA
Resolution 1 mΩ 10 mΩ 100 mΩ 1 Ω
Accuracy ± .02% of reading & range ± .02% of reading & range ± .02% of reading & range ± .02% of reading & range
Display 4 1/2 digit LED Terminal Banana jack binding posts
Storage Temperature Range -10° to 70° C Operating Temperature Range 0° to 50° C
Dimensions 9.75″ x 10″ x 3.25″ Weight 3 lbs.
Power 4 ea rechargeable 5AHr NICAD batteries Max. Input Voltage 250 VDC
Open Circuit 1.6 VDC Max. Internal Voltage 15 VDC
Update 3 readings/second Temperature Coefficient ± .002% per 1° C
Ordering Information

The 620A-4 failsafe ohmmeter may be purchased as a part of two separate packages, which are listed below.
This product is unavailable for online purchase. For specific pricing information or to place an order for a 620A-4 meter, please contact us today.

Package Description Price
NSN Package Includes 620A-4 failsafe ohmmeter, (OP-100) transit case, (OP-290) leads, (620-DC) battery charger, (OP-430) connector adapter, & U.S. N.I.S.T Calibration Certificate. Request a quote!
Commercial Package Includes 620A-4 failsafe ohmmeter, (OP-300) leads, (OP-401) probes, (OP-110) lead pouch, (620-DC) battery charger, & U.S. N.I.S.T Calibration Certificate. Request a quote!
Lead/Probe Sets The 620A-4 ohmmeter is compatible with our 620 Series probe/lead sets and accessories. This product is also customize-able: it can be rack mounted, contain an RS232C interface, or use an optically isolated power source, for example. Contact us for more information.
Compatible Accessories
Part Number Description Link Price
620-DC Battery Charger for 620 Series Igniter Testers Click Here $150.00
620-BAT Set of 4 NiCd D cell batteries Click Here $95.00
OP-100 Transit Case Click Here $175.00
OP-290 4′ Alligator Clip Lead Set Click Here $160.00
OP-300 4′ Gold Plated Kelvin Clip Lead Set Click Here $160.00
OP-304 4′ Banana Jack Calibration Lead Set Click Here $265.00
620 Series Leads The 620A-4 is compatible with our 620 Series probes and leads Click Here