ZERO (continued)
However if the test leads are changed (i.e from clips to probes) we recommend resetting the zero on the
AMPTEC 620UK Ohmmeter.
After the “ZERO” adjustment of the test leads is accomplished, the AMPTEC 620UK Ohmmeter is ready to
connect to the resistance under test.
The span of the “zero knob” is not infinite
. For ordnance test applications
where the resistance offset of the “squib wire harness”, “
a.k.a
resistance under test” is greater than the span of
the AMPTEC 620UK Explosive Safety Ohmmeter “Zero” knob most users record the “in-series” offset
resistance.
end of zeroing description
D-3
Photo of AMPTEC 620UK in Carry Case
Earth Connection between Case and Ohmmeter is shown
The front panel of the AMPTEC 620UK houses the following components:
A)
Pattern 104 3-Way Plug Type
SB104-T4-BS-3PXO (NSN 5935-99-0131-244).
B)
Chassis Ground Connector
.
C)
4½ Digit LCD Display
with Low Battery Indicator and Over-Range Indicator.
D)
Resistance range selector (Seven way rotary switch with selectable ranges of
2.0 ohm, 20 ohm, 200 ohm, 2.0 K ohm, 20 K ohm, 200 Kohm and 2.0 Mohm).
E)
Zeroing
Potentiometer to zero the meter reading.
F)
Back-Light selector switch to turn backlight on and off.
G)
Power
on/off switch (
hold down for 2 seconds
for “Power on”).
13
Item A
Item B
Item C
Item E
Item D
Item F
Item G
