AMPTEC Research · Intrinsically Safe Ground Continuity Testers
620LK-P5
Intrinsically safe, high-accuracy ground continuity and bond resistance tester built for aerospace bonding work.
620LK-P5 is an affordable, accurate and intrinsically safe ground continuity tester. It reads the resistance between the part under test and ground automatically and tells you whether the ground is good. Two ranges with milliohm-level resolution suit aerospace bonding measurements, including elevator tab assembly checks. Commercial aircraft production lines and maintenance shops use it as their standard bond tester.
Overview
AMPTEC 620LK-P5 is an intrinsically safe ground continuity tester that reads the resistance between a part and ground directly, so an engineer can decide quickly whether continuity meets the requirement. It has two ranges, 20 Ω and 200 Ω, resolves down to 0.001 Ω, and holds ±0.05% of range accuracy. The test current is low, 1 mA or 0.1 mA, which keeps the circuit under test out of harm's way. The meter is UL-913 certified for intrinsic safety and MIL-STD-810 compliant, works from −20° to 50° C, and pairs a 4½-digit LCD with a compact 3 lb body. Safety certification, portability and accuracy make it a natural fit for aerospace bonding and grounding work. It ships with a 630-100 padded case, a 10 ft test lead set and a calibration certificate; check which probe set matches your test points before ordering.
Key specifications
| Ranges | 20 Ω / 200 Ω (dual range) |
|---|---|
| Resolution | 0.001 Ω (20 Ω range) / 0.01 Ω (200 Ω range) |
| Accuracy | ±0.05% of range |
| Test current | 1 mA (20 Ω range) / 0.1 mA (200 Ω range) |
| Max. internal voltage | 5 VDC |
| Max. input voltage | 250 VDC |
| Display | 4½-digit LCD |
| Update rate | 1 reading every 3 seconds |
| Operating temperature | −20° to 50° C |
| Storage temperature | −40° to 75° C |
| Power | 4× AA 1.5 VDC alkaline batteries |
| Weight | 3 lbs |
Features
Certified intrinsically safe
UL-913 certified for intrinsic safety and MIL-STD-810 compliant, so it can be used where bonding and grounding checks are safety sensitive.
Milliohm-level accuracy
Two ranges with 0.001 Ω resolution and ±0.05% of range accuracy resolve small bond resistances with confidence.
Low test current
Measures at 1 mA / 0.1 mA, keeping the circuit under test out of harm's way in safety-critical applications.
Readable digital display
4½-digit LCD updating every 3 seconds, quick to judge on site.
Compact and portable
About 3 lbs on 4 AA alkaline cells, delivered with a 630-100 padded case and a 10 ft test lead set for production line and field use.
Wide operating temperature
Operates from −20° to 50° C, so it measures reliably in harsh aerospace and industrial field conditions.
Typical applications
Aircraft maintenance
Ground continuity on control surfaces and elevator tabs
During scheduled MRO on commercial and military aircraft, technicians use 620LK-P5 to measure ground continuity on ailerons, rudders and elevator tabs. Each metal-to-metal joint is confirmed within specification (no more than 0.003Ω per connection) so static cannot build up near the fuel system or couple interference into the avionics.
Hazardous areas
Grounding compliance in explosive gas atmospheres
In fuel depots, pyrotechnic stores and military facilities with volatile vapors, 620LK-P5 carries UL-913 intrinsic safety and EU ATEX approval (EEX-9B-IIC-T4) for Class I Division 1 locations. Equipment grounding is verified on site without shutting down to purge the atmosphere, reducing the risk of static discharge ignition.
Defense manufacturing
Grounding QC on aerospace and defense assembly lines
In assembly processes used by NASA and the USAF, 620LK-P5 verifies the ground path resistance between structural parts and ground wiring. During missile, satellite and aircraft build and integration, every conductive assembly is checked against MIL-STD-810F and ISO 9001:2015 quality requirements so a poor ground cannot cause a system failure or an ignition hazard.
Options and configuration
Tick the options you need. We compile the configuration into a list and carry it into the quote request form.
Standard equipment (included)
Probe and test lead options
Storage and carrying options
Downloads
Need pricing, specifications or lead time for 620LK-P5?
Also available for rent: 620LK-P5 is part of the AMPTEC rental program, for project peaks, calibration backup and pre-purchase trials. Rental inquiry →