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 intrinsically 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. 

          NSN 6625-01-542-7487  

The new enhanced AMPTEC 620UK-B (Ultra Low Resistance) Explosive Safety Bonding Milli-Ohmmeter 

AMPTEC 620UK-B Bonding Milli-ohmmeter's failsafe constant current source operates at ten times the level (100 mA vs 10 mA) of the original AMPTEC 620UK-B Bonding Ohmmeter. The higher current level provides the new enhanced 620UK-B with rock solid accurate readings below 1/2 or 0.5 milliohms with 0.01 milliohm resolution and a very high 0.1 milliohm accuracy. 
The AMPTEC 620UK-B Explosive Safety Bonding Milliohmmeter is Approved for use in hazardous and volatile environments for use around Aircraft (Fuel-Air Areas), Fuel Cells/Tanks, and Gas Systems per the only Standard the USAF accepts (MIL STD 810, Method 511 Rev F.) to +50°C (Will not make a Spark). 


Bond Measurements made Easy - Direct Digital Display in 0.01 milliohms
Focus on the Probe Placement not the Meter 
The "Auto-Lock" feature automatically "Locks-On" & holds (displays) the lowest ohm bond measurement for 10 seconds then automatically resets. The intelligent new enhanced AMPTEC 620UK-B's "Auto-locks", once continuity is established, onto the lowest resistance (bond) measurement automatically. This allows the operator to focus on proper Kelvin probe placement on the test device (i.e. aircraft) without having to look at the meter while measuring, no range changes to deal with, no zeroing of the test leads. No erroneous readings, only when continuity is made, does it continuously sample measurements and lock in the lowest resistance reading and holds/displays it for 10 seconds (display backlight also comes on), then automatically resets (or manually select the front panel "Auto Measure Reset" switch to start over).


Lightweight - 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 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 new enhanced AMPTEC 620UK-B 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 00.01 milliohms to 2,000 milliohms (2.0 Ohms) fullscale  - Less Operator Error - Can't mistake an ohm reading for milliohms

*  Enhanced Designed based upon the USAF Bonding Meter (USAF's AMPTEC 620UKB Bond Meter) - ideal replacement for near obsolete, aging and over-priced 3 ½ digit AC Bonding Meters ( AVTRON T477W ). As a ruggedized milliohmmeter The AMPTEC 620UKB offers high accuracy (DC  - accurate to 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 - Ideal for 2.5 milliohm bond determinations - 4 Wire Kelvin Milli-Ohmmeter with 0.1 milliohm basic accuracy from 0° to 40°C

*  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 new enhanced AMPTEC 620UKB 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 620UK-B Explosive Safety Bonding Milli-Ohmmeter NSN Package also includes:

1) protective padded carrying case,

2) 4-Wire Kelvin Handheld Probes (OP630-403 Mini-probes),

3) Operator/maintenance manual and 4) U.S.A. N.I.S.T Traceable Calibration Certificate  - MIL STD 130 Marking and MIL STD 129P packaging is optionally available. The new enhanced AMPTEC 620UK-B Low Ohm Bond Meter is the ideal replacement for Aircraft Equipment Maintenance Team's to modernize their inventory of older heavier 3 ½ digit bonding ohmmeters like the Avtron T477W bond meter they been using since the 1970's. 

As a battery powered (4 ea, "AA"), 4 ½ digit milliohmmeter (bond meter) , the lightweight portable. AMPTEC 620UK-B Bond Milli-Ohmmeter can safely measure the resistance of cable lug to metal bonds, jumpers and bolted metal to metal connection integrity from 0.01 milliohms to 1999.9 milliohms.  The 4 Wire Kelvin test leads (handheld probe set) automatically eliminate test lead length resistance errors and Kelvin probe contact resistance errors. The AMPTEC 620UK-B 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.

Rear Panel view of the AMPTEC 620UK-B Bonding Milliohmmeter with optional Charging Jack

The new enhanced AMPTEC 620UK-B 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 Option "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 enhanced AMPTEC 620UK-B 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 new enhanced 620UK-B 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 620UK-B Bonding Milliohmmeter user desires to use them.

Independent Certification - Environmental Test Laboratory in Los Angeles, CA - While fully operational, the AMPTEC 620UK-B 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 620UK-B Safety Bond Milliohmmeter when making contact with the item under test ( aircrfat 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 620UK-B 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 620UK-B Bonding Ohmmeter Commercial 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 rounded end tips. Sharped pointed 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 620UK-Btm 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.

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 new enhanced AMPTEC 620UK-B 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.)