D-2.1 Test Leads and Chassis Ground Connections ( 2 wire version only)
The Amptec 620UK Explosive Safety Ohmmeter Test Lead Connection uses a 3-pin connector on its
front panel, labeled “Test Leads” . The output connector is a pattern 104, 3 way Type SB104-T4-BS-
3PXO Nato Stock Number 5935-99-0131244. The pin A of the connector is the Voltage Low and
Current Low Test Lead connection contact. Pin B of the Test Lead connector is Voltage High and
Current High. The third pin (pin C) is chassis ground and/or can be used as a “shield” around the other
two lines (A and B) if your test lead wiring is fitted with a shield wire. When first arriving at a
location, the AMPTEC 620UK user should connect the unit's chassis ground panel jack on the transit
case to a local earthy or ground connection. The unit's chassis ground panel jack is wired to the case,
front panel, rear panel, battery compartment and also Pin “C” of the connector. The unit's chassis
ground can also be plugged into an earth
ground connection for example at the test site to preclude any
static voltages from building up.
The AMPTEC 620UK Ohmmeter front panel chassis ground panel jack and pin C of the NATO test
lead connector are both chassis ground. The AMPTEC 620UK user may use either chassis ground
connection as a test lead shield (provided the test leads are the shielded variety). The unit's chassis
ground can also be plugged into an earth ground connection for example at the test site to preclude any
static voltages from building up.
D-1 GENERAL USE
The AMPTEC 620UK is designed to operate for approximately 1 year under normal use before the 4
“AA” batteries need to be replaced. The “LOW BAT” indicator on the units LCD Display is factory
adjusted to come on with the internal batteries need to be replaced. (Due to tamper-proof screw access to
the separate metal battery compart-ment, located in the back of the 620UK, please refer to battery
replacement to authorized CALIBRATION/MAINTENANCE personnel only.). The AMPTEC 620UK is
DC current based, about 200 times more accurate (~0.02%) than AC current models and provide a solid
reading rate of 3 readings per second. The AMPTEC 620UK also uses internal solid state voltage
reference(s) that permit the product to be used immediately after the unit has been turned on (within the
temperature range limits of use as stated in section B of this manual).
D-2 FRONT PANEL
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SECTION D : OPERATION , FUNCTION, AND USE
