Amptec 620BH Fail-Safe Ohmmeter

Amptec 620BH Intrinsically-Safe EED Tester

The AMPTEC 620BH Low Resistance Fail Safe is a portable digital fail-safe ohmmeter which has been specifically designed to remain inert in the event of an internal failure for ultra-safe resistance testing on current sensitive devices (i.e. squibs, igniters, flares, airbags, explosive bolts). The 620BH is primarily for indoor lab use. The AMPTEC 630ES and AMPTEC 640SL are ruggedized, explosion-safe and waterproof versions with similar test capabilities.

Download Data Sheet

620BH Fail Safe Ohmmeter – High and Low Ohm Ranges

The AMPTEC 620BH features five way gold panel jacks that directly accept wiring, spade lugs and banana jacks (i.e. with 4 wire Kelvin Clips). The AMPTEC 620BH uses the same USAF Approved Fail Safe current source as the AMPTEC 620A-4 for its resistance circuitry. The unit’s circuitry has been reviewed and approvals are pending by many Safety Boards as well as most branches of the armed forces for specific military programs.

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 20 Megohms?” This lead to the development of the AMPTEC 620BH Explosive Safety Igniter Tester. The AMPTEC 620BH offers the following fullscale ranges – 2.0 Ohms, 200 Ohms, 200Kohms and 20.0 Megohms. 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 optional OP300 Kelvin Clip Test Leads that eliminate the effects of test lead length resistance and contact resistance errors.

Isolation Testing to 20.0 Megohms

The 20.0 Megohm range on the AMPTEC 620BH provides a high resistance range for determining open circuit or “electrical isolation between any two contact test points or wires” (>;20.0 Megohms) status on wiring and current sensitive devices. See the AMPTEC 620EH if you only need to measure isolation resistance to 2.0 Megohms.

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 620EH Igniter Tester only measures resistance, it is not a complex multifunction DMM. If the 620BH has an electrical fault, it offers the life saving advantage of failing safe.