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620UK-V4 | 4-Wire Intrinsically Safe Explosive Safety Ohmmeter

The AMPTEC 620UK-V4 Ohmmeter is the 4-Wire version of our 620UK meter. It is a portable EEX digital igniter tester designed for ultra-safe resistance testing on squibs, flares, bridge-wire, and other explosive devices. The 620UK-V4’s failsafe design allows it to comply with the EU ATEX Directive, the Intrinsic Safety Standard EEX-9B-IIC-T4, and USA MIL. STD. 810F, as well as many other international defense standards.

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



Range 2 Ω 20 Ω 200 Ω 2K Ω 20K Ω 200K Ω 2M Ω
Nominal Current 5 mA 5 mA .5 mA 50 uA 5 uA .05 uA 50 nA
Failsafe Current 8 mA 8 mA 1.5 mA 150 uA 15 uA 1.5 uA 150 nA
Resolution 100 uΩ 1 mΩ 10 mΩ 100 mΩ 1 Ω 10 Ω 100 Ω
Accuracy ± .02% of reading & ± .05% of range ± .02% of reading & range ± .02% of reading & range ± .02% of reading & range ± .02% of reading & range ± .05% of reading & range ± 1% of reading & ± .2% of range
Display 4 1/2 digit LED Terminals Amphenol 4-wire Kelvin
Temperature Coefficient ± .002% per 1° C Update 3/sec.
Accurate Temperature Range 25° ± 10° C Operating Temperature Range -20° to 40° C
Dimensions 7″ x 8″ x 3″ Weight 8 lbs.
Power 1.5V alkaline Max. Input Voltage 250 VDC
Open Circuit <1.4 VDC Max. Failsafe Current 8 mA
Ordering Information

The 620UK-V4 ohmmeter is available for purchase in one package and is compatible with only its own 620UK-V4 Series accessory line.
For specific pricing information or to place an order for a 620UK meter, please contact us today.

Package Description Price
V4 Package Includes 620UK 4-wire ohmmeter, (630-100) padded case, (620UK-305V4) leads, & U.S. N.I.S.T Calibration Certificate. Request a quote!
Lead/Probe Sets The 620UK ohmmeter is compatible only with the 620UK Series probe/lead sets and accessories. Please note that the 2-wire and 4-wire versions of the product use different probe/lead sets.
Please note that due to a significant backlog, any orders for instrumentation which need to be shipped from our facility by the end of 2021 must be placed by October 8, 2021. We apologize for any inconvenience this may cause.