620LK Operation and Maintenance Manual – Rev. J – Updated January 2020
Page 7
13231 Rooster Springs Rd.
Austin, TX 78737
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amptec.com
SECTION D: OPERATION, FUNCTION, AND USE
D-1 General Use
The AMPTEC 620LK is a milliohmmeter designed to safely measure low level DC
resistance from 0.01 to 1999.9 m
Ω
. The 620LK meter uses internal solid state voltage
reference(s) that permit the product to be used immediately after the unit has been
turned on (temperature range limits permitting). If you flip the carrying case lid
completely open, and connect the carrying case strap to the unit’s front buckle, the unit
can be carried hands free.
To use the 620LK meter to make a resistance measurement, first connect the desired
measurement leads to the Trident connector on the front panel of the meter. Place the
measurement leads across the unknown resistance value that needs to be measured.
At this point, the 620LK meter should start updating the LCD screen once an electrical
connection has been made. After approximately 3 seconds, the meter will produce a
beeping sound, and the backlight will turn on to illuminate the LCD screen. If the
measurement leads are removed from the component that was being measured, the
meter will hold the resistance reading on the screen. The 620LK meter will resume
measuring resistance once the measurement leads sense a new applied resistance
value, or by pressing the “Auto Measure Reset” button.
If you have any other general use questions, please contact AMPTEC.
D-2 Front Panel
The below sub-sections, D-2.1 through D-2.7, provide information on the features,
design, and uses of the 620LK meter’s front panel. The below photo also shows the
details of the 620LK’s front panel.
D-2.1 Test Leads and Chassis Ground Connections
The AMPTEC 620LK meter test lead connection uses a 4 terminal-in connector on its
front panel, as seen in the diagram on the next page.
The unit’s front panel chassis ground panel jack (which also accepts an external banana
jack) is wired to its all metal case, metal front panel, rear panel, battery compartment,
