620LK | Intrinsically Safe Bonding Ohmmeter
August 27, 2015
620A-4R | Ruggedized Digital Failsafe Ohmmeter
September 4, 2015
620A-4 | Digital Failsafe Ohmmeter
The 620A-4 Igniter Circuit Tester is our flagship ohmmeter. 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 was the first we designed in our long line of intrinsically safe instruments. Capable of making highly accurate resistance measurements from 20 Ω to 20 KΩ, this ohmmeter has a proven track record of durability: with 20+ year old units still being used in the field today. This unit has been designed to never have a current level that exceeds 8 mA – the cornerstone of our failsafe design. The 620A-4 is compatible with many convenient modifications, such as OP-247 Optically Isolated Power (enabling the unit to run on AC power rather than batteries) or OP-232 RS232C Interface (enabling the unit to communicate with your computer via an RS232 port), allowing you to fully customize your instrument and cater it to your specific needs. 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.
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. Amptec is an ISO 9001:2015 certified company, ensuring each instrument is manufactured to the highest quality standard. Every instrument made is designed and manufactured in the USA, comes with an extensive one-year warranty, and an N.I.S.T. calibration certificate with data at no extra charge.
Please contact us to purchase.
Specifications
Range, Resolution, Accuracy, and Current Levels
| Range | 20 Ω | 200 Ω | 2K Ω | 20K Ω |
|---|---|---|---|---|
| Nominal Current | 5 mA | .5 mA | 50 uA | 5 uA |
| Failsafe Current | 8 mA | 8 mA | 8 mA | 8 mA |
| 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 |
General Specifications
| Display | 4 1/2 digit LED | Terminal | Banana jack binding posts |
|---|---|---|---|
| Storage Temperature Range | -20° to 70° C | Operating Temperature Range | 0° to 50° C |
| Dimensions | 9.75″ x 10″ x 3.25″ | Weight (Standard Version) | 3.5 lbs. |
| Power | 4 ea rechargeable 5AHr NICAD batteries | Max. Input Voltage | 250 VDC |
| Open Circuit | 1.6 VDC | Max. Internal Voltage | 4.8 VDC |
| Update | 3 readings/second | Temperature Coefficient | ± .002% per 1° C |
Ordering Information
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. |
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Downloads
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 | – |