Amptec Research 620LK Installation, Operation And Maintenance Manual - Page 12
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620LK Operation and Maintenance Manual – Rev. J – Updated January 2020
probes for 3 to 5 seconds. The meter has 2 resistance ranges (a 199.99 mΩ range and
a 1.9999 Ω range) and needs a little settling time to automatically determine which
range is best before displaying the calculated bond value.
When the display backlight comes on, the meter has made a bond measurement. The
probes may be removed while the unit's backlight is on, as the unit's autolock feature
freezes the reading. The backlit frozen measurement will stay frozen until you either
press the "AUTO MEASURE RESET" button or press the test probes against a
conductor (meaning continuity is sensed). When ready to make another measurement,
simply place the probes back on the test items, and the meter will automatically make
another measurement. See section D-2.7 on page 9 for more information regarding the
autolock feature.
The user may use the unit's carrying case with padded straps to securely hold the bond
meter around their neck, while their hands hold the Kelvin probes and make bond
measurements. Repetitive measurements assure a good bond measurement; it may be
necessary to hold the probes down for 2 consecutive displayed measurement cycles to
avoid any timing issue of probe placement in the unit's measurement cycle, and
assuring the first initial settling in on the proper range. Bond measurement is almost
always a pass/fail test to determine if the bond is better than a given resistance level.
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