As a bonding meter or bonding milliohmmeter the AMPTEC 620UKB Bond Meter measure bonds similar to the AVTRON or  AVTRON T477W bond meter NSN 6625-01-119-7023 and model 101 bond micro ohmmeter, and the PPM or PPM instrumentation R1L-E2B measurement. The AMPTEC RESEARCH 620UK-B or amptec research low resistance can be a Ohmmeter including NSN 6625-01-542-7487  for use in explosive atmospheres and volatile environment fuel air areas and is intrinsilly safe. Failsafe Ohmmeter, DLRO, bond tester, or AMPTEC 620A or  amptec dlro micro-ohmmeter. The amptech, or amptek EEX or Eex and  EEX Intrinsically safe Eex Intrinsically safe EBWalso ebw or eed tester can also be a ETL tester or EED or squib checker  continuity tester. 

Presently (week of 25SEPT)  we have low volume (single unit) order requirement AMPTEC 620LK Low Resistance Bonding Milli-Ohmmeter(s) in STOCK and "On-The Shelf". The AMPTEC 620LK Bonding  Milli-Ohmmeter can come configured as either the  "Commercial Air Package" and/or "LM" packages (see below for accesory/package description) can ship same day as ordered (credit card orders, established customer etc.) For multiple unit requirements contact the sales department ( info@amptec.com ) for availability/delivery details. 

AMPTEC 620LK Bonding Milli-Ohmmeter
Approved for use on the USAF's Fleet of Boeing 707, 727, 737, 747, 777 Jet Transports in Hazardous Fuel Air Environments - Fuel Cells / Tanks , Aircraft Fuel Installations etc.  


After a thorough evaluation by the USAF Electrical Standards Bonding and Grounding Group, the AMPTEC 620LK Bond Meter has been placed at the top of their list as approved for use on Boeing 707, Boeing 727, Boeing 737-747, Boeing 757-777 for Ground bond testing in explosive hazardous areas. Just ask some of growing list of commercial airline customers (contact AMPTEC Sales Dept.) about how they prefer the new AMPTEC 620LK Bond Meter for reliability, accuracy and ease of use over the antiquated pricey competition (almost $10,000.00) like the AVTRON T477W bond meter or the bulky BCD M1 Bonding Milliohmmeter.

Since the AMPTEC 620LK Safety Bond Meter is Approved by the USAF and it is also Mil Std 810 Method 511 Explosive  and Volatile Fuel Air use in hazardous environment compliant it is ideal for safe use around volatile fuel air hazardous areas.

The AMPTEC 620LK Explosive Safety Bonding Milliohmmeter is Approved for use in hazardous and volatile environments for use around Aircraft (Fuel-Air Areas), Fuel Cells/Tanks, Gas Systems, and around Aircraft Fuel Installations (Will Not make a Spark). 

AMPTEC 620LK (Ultra Low Resistance) Explosive Safety Bonding Milli-Ohmmeter 

Derived from the USAF's AMPTEC 620UK-B Bonding Milliohmmeter, the brand new AMPTEC 620LK Low Resistance Safety Bonding Milliohmmeter measures even lower bond resistance levels with even better

resolution and better accuracy. Designed originally for measuring very low resistance bonds that are less than ½ milliohm (on the Lockheed Martin F-35 Joint Strike Fighter). The standard version AMPTEC 620LK Bonding Milli-ohmmeter's failsafe constant current source operates with a 100 mA and is accurate to 0.1 milliohms (0.01 milliohm resolution). The high resolution (option HR) version is accurate to 0.005 milliohms with 0.001 milliohm resolution.

Low level Bond Measurements made Easy -

Lightweight - Ideally Portable - It only weighs 3 1/2  Lbs,  so little weight that it can be carried around your neck (Side panel "D" ring clipped onto the carrying case padded strap) and can make measurements while still in the case, (Hands Free) without having to hold the meter. An Optional Transit Case "OP-100" a hardshell impact resistant foam lined transit case is also available. The black padded carrying case comes with the meter as standard.

 





The AMPTEC 620LK Explosive Safety Bonding Milliohmmeter is Approved for use in Hazardous and Volatile Environments around Aircraft (Fuel-Air Areas), Fuel Cells/Tanks, Gas Systems, and around Aircraft Fuel Installations (Will Not make a Spark).
 
The AMPTEC 620LK Bonding Ohmmeter is certified MIL STD 810-511, rev F  compliant for "Explosive Atmospheres" use to +50°C  (122°F), ideal for use in explosive/volatile hydrocarbon fuel air atmospheres. It's battery powered (4 ea, "AA" ), 4 ½ digit milliohmmeter. It safely measures resistance of metal to metal bonds, jumpers and connections from 0.01 milliohms to 2.0 Ohms (in milliohms).  The 4 Wire Kelvin test leads (handheld probe set) automatically eliminates test lead resistance offsets and probe contact resistance errors. The meter's electronics are completely isolated from the unit's battery compartment. An optional conductive (<100 Megohms/sq.) carrying case w/ chassis ground jack allows readings to be made while in the padded case.

*  4 ½ digit resolution, automatic ranging  from 000.01 milliohms to 2.0 Ohms fullscale (Std version 620LK) 

*  Enhanced Designed based upon the USAF Bonding Meter (USAF's original AMPTEC 620UKB Bond Meter) - ideal replacement for obsolete, aging and over-priced 3 ½ digit AC Bonding Meters. As a ruggedized milliohmmeter The standard AMPTEC 620LK offers high accuracy (DC  - better than 0.1 milliohm), 4 ½ digit resolution, 0.01 milliohm resolution with "No Warm-up" required its ready to use when turned on.   

*  High Accuracy - The High Resolution (white unit) Version AMPTEC 620LK 4 Wire Kelvin Bonding Milli-Ohmmeter provides excellent 0.001 milliohm resolution and 0.01 milliohm accuracy from 0° to 40°C . Thats better than 0.5% of reading for a 2.5 milliohm bond measurement. 

The Standard AMPTEC 620LK (black front panel version)  provides 0.01 milliohm resolution and 0.10 milliohm accuracy from 0° to 40°C. Thats better than 5% of reading on a 2.5 milliohm bond measurement.

*  Instant "ON", "No Waiting for a Warm-up Period", it's ready to use immediately after being powered up - The solid state internal reference(s) used by the AMPTEC 620LK Bonding Milli-Ohmmeter make it ready to use the instant it's water-proof power switch turned "on". 

*  All metal ( Faraday Cage) construction (front, back and all sides), textured powder coated aero aluminum  (AL 5052 alloy), all connected to front panel chassis ground jack.

* Separate battery compartment, operates on 4 ea "AA" Alkalines (Duracell Coppertops) or Optional Rechargeable "AA" (NiMH cells ), field replaceable batteries (anyone can change the batteries) without breaking the calibration seal. There is "No access to any electronics inside the unit's battery compartment". It's also water-tight (gasket sealed compartment) and is corrosive resistant Per MIL PRF 28800D to any alkaline battery leakage or any chemical corrosion.

* Ruggedized use -Silicone rubber boot covers on all switches protects the instrument against saltwater spray, rain and dust.

* AMPTEC 620LK Bonding Milli-Ohmmeter Commercial Air Package available:

A) Includes the protective padded carrying case (holds the bond meter and the probes, see photo above).

B) 4-Wire Kelvin Handheld Probes (OP630-406S Mini-probes - 5' long covers a 10' spread) part of the Commercial Air Package (similar to 10' OP630-405S long photo below) along with the US NIST Traceable Calibration Certificate and Operator manual.

Option 630-405S Heavy Duty Spring Loaded Gold Plated Kelvin Probes (10' long)

The "LM" Package of Heavy Duty Spring Loaded Gold Plated Kelvin Probes include a 10' long set (20 ' span - similar to photo shown above) of spear tipped Probes plus the 5' long Heavy Duty Spring loaded Kelvin Probes and a spare set of spiked tips (can be swapped out using a pair of pliers). The LM package for the AMPTEC 620LK Bonding Milli-Ohmmeter also includes the padded carrying case, U.S. N.I.S.T. Traceable Calibration Certificate and operator manual (2 year warranty).

These OP630-405S Heavy Duty Spring Loaded Gold Plated Kelvin Probe tips are about 50% stronger spring compression than the standard 4' long AMPTEC Kelvin Mini-probes that are part of the more economical "Commercial" package. The sharp point tips themselves are also stronger and a 30% larger diameter than the standard AMPTEC commercial Kelvin Min-probe tip.

A) Operator/maintenance manual and B) U.S.A. N.I.S.T Traceable Calibration Certificate. The AMPTEC 620LK Low Ohm Bond Meter is the ideal replacement for Aircraft Equipment Maintenance Team's to modernize their inventory of old heavy bonding ohmmeters they been using since the 1970's. 

As a battery powered, 4 ½ digit milliohmmeter (bond meter) , the lightweight portable. AMPTEC 620LK Bond Milli- Ohmmeter can safely measure the resistance of cable lug to metal bonds, jumpers and bolted metal to metal connection integrity from 0.001 milliohms to 19.999 ohms (HR model).  The 4 Wire Kelvin test leads (handheld probe set) automatically eliminate test lead length resistance errors and Kelvin probe contact resistance errors. The AMPTEC 620LK Safety Bond Milli-Ohmmeter is based upon the AMPTEC 620UK Intrinsically Safe Ohmmeter design. It meets the EU ATEX Directive and the Intrinsic Safety standard Eex-ib-IIc-T4, is EMC tested in accordance with British DEF STD 59-41 Radiated Emissions & Susceptibility,  British DEF STD 66-31 (Heat, Cold, Humidity & related tests), and is US NAVY Ordnance Safety Board Approved for use on ESSM (Evolved Sea Sparrow Missile ) Rocket Motor and Warhead Squibs.

OPTIONS TO CONSIDER:

Option “630-408J” Bond Meter Test Leads are both a single Large Kelvin Clip at one end (10’ long) and single handheld Kelvin probe at the other. This frees up an operator to simply clamp one lead (jaws) to the chassis and Kelvin probe any metal item (bond test) of interest (20’ span). Clamp one end (Heavy Duty Kelvin Clip - JAWS) leave it alone, and "bond test" probe around wherever you want with the single Kelvin probe up to 20' away. 

Rear Panel view of the AMPTEC 620LK Bonding Milliohmmeter

The AMPTEC 620LK Bonding ohmmeter normally comes with 4 ea. disposible AA Alkaline batteries (ie Duracell coppertop), and battery life with disposible batteries depends on the usage (typically several weeks of use). The Optional "NiMH" can typically operate for years of normal use on a standard set of 4  "AA" rechargable batteries (Rechargeable NiMH - Duracell, Energizer etc). With the battery compartment separate from any internal electronics, the user can change the batteries and not effect the instrument's calibration. The battery compartment cover is gasket backed to provide a water tight seal. The battery compartment is also MIL PRF 28800D compliant to be protected against any battery corrosion ( leaking alkaline material).  

Easy to Calibrate "No Covers to Remove"

In addition, once the tamper resistant calibration sticker is removed from the AMPTEC 620LK Bonding Milli-Ohmmeter's rear panel, its easy to get to the unit's two calibration access holes and it's a breeeze to calibrate. There are "No Covers" to remove, the PMEL or calibration facility simply connects the 620LK (standard version) to the proper Primary Resistance Standard and has two simple adjustments to make (Fullscale@100 milliohms and 10% of scale@1.00 milliohm). Calibration hole plugs are also included (inside carrying case pocket) if the AMPTEC 620LK Bonding Milliohmmeter user desires to use them.

Independent Certification - Environmental Test Laboratory in Los Angeles, CA - While fully operational, the AMPTEC 620LK Explosive Safety Bond Meter's 
test leads were successfully shorted then "opened" 400 times in the "saturated" 
explosive atmospheric fuel air mixture (Per MIL STD 810 Method 511 Rev F. "Explosive Atmospheres").

It was shown to be fully MIL STD 810 Method 511 Rev F. "Explosive and Volatile Atmospheres" compliant @ +50°C.  This means the AMPTEC 620LK Safety Bond Milliohmmeter when making contact with the item under test ( aircraft chassis, fuel tank etc) does not produce sparks with minimal kinetic energy levels (not hazardous, will not ignite jet fuel or other volatile hydrocarbons).

IP54 - Ingress Protection Rated (Water Spash)

The AMPTEC 620LK Bond meter's ITT "Trident" weather-proof connector  (IP-54) with cap provides a secure & popular military spec 4 Wire Kelvin resistance "Test Lead" connection and a chassis ground pin. The benefit of it being a 4-Wire Kelvin milliohmmeter is test lead length offset errors and test lead contact reistance errors are automatically eliminated. In addition any of AMPTEC's 630 series 4-Wire Kelvin test leads, jacks and handheld mini and micro-probes are compatible with the AMPTEC 620LK bond meter front panel Tridenttm connector.  

Optional 4 Wire Kelvin Pistol Grip Probes

The AMPTEC 620LK Bonding Ohmmeter "Commercial Air Package" includes: Padded Carrying Case, Manual, Calibration Certificate and  a set of 4 Wire Kelvin Handheld Probes or 4 Wire Kelvin Pistol Grip Probes ( Option PG-401). Each pistol grip probe has two spring loaded heavy duty pointed end tips. Rounded tip based probes are also available upon request. All AMPTEC 630 series 4-Wire Kelvin test leads (i.e. banana jacks, handheld micro-probes etc.) are compatible with the AMPTEC 620LKtm 4-Wire Kelvin test lead connector. Bonding Milli-Ohmmeter as they ( 630ES, 630BN etc.) are all designed to connect to the same front panel ITT Canon Trident (see photo below)

  
Option 630-304 Gold Plated Kelvin Mini-probes are available along with a host of test leads and accessories.

Unlike Our Competition, the compact AMPTEC 620LK others doesn't need or use a  Heavy Weight Battery Pack  

Any brand of "AA" Alkaline or optional rechargeable NiMH "AA" battery will work

Unlike some of our competition's, heavy weight bond meters with "lead acid battery - bowling ball" equivalent mass of 12 LBS or more . . .  The AMPTEC 620LK Bonding Ohmmeter (3 LBS vs 12 LBS) does not use or need a heavy weight lead acid based battery pack, like those found on older model bonding ohmmeters. The compact AMPTEC 620LK (standard version) is powered by 4 ea "AA" alkaline batterries. The lighter compact nature of the AMPTEC 620LK Safety Bonding Milli-Ohmmeter makes it ideal for carrying out to the flight deck or extended multiple bond measurements for (Aircraft) production use. Imagine having to wear/hold our competitors (12 LB) Bonding Ohmmeter while reaching up with the probes to make a difficult to reach spot for a bond measurement on an aircraft. You get the picture - The compact AMPTEC 620LK wins handsdown for ease of use and accuracy.      

Integrity of Measurement and an instrument's accuracy is important to us. It should be important to you. To provide proof, in writing, that an instrument is truly accurate, many instrument companies charge extra for a new instrument's calibration certificate, Not at AMPTEC RESEARCH. All new AMPTEC instrumentation comes with a U.S. N.I.S.T. traceable calibration Certificate, good for 1 year, at "No Extra Charge". After the 1 year calibration interval has expired on your AMPTEC meter, we can still re-certify the product for you. Contact our customer service department for details.

Acrylic Epoxy Encapsulated Coated Circuit Board and More ...
A common question we get from evaluating safety engineers is "What sort of corrosion preventative on components on the PCB and electrical and  mechanical  measures are taken with the AMPTEC 620LK to prevent an internal  loose wire, metal screw, or washer inside from floating around and shorting the battery output to the terminal output connections?".  The ohmmeter's output connections are insulated inside the unit with heat shrink tubing covering any of it's conductive surfaces.  The entire PCB (except for the calibration trim pots) is also non-conductive acrylic epoxy encapsulated/coating, to make it extremely difficult to get an accidental conductive pathway. This coating also provides excellent humidity protection and resistance to environmental extremes ( dust etc.)