SECTION D: OPERATION AND USE
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D-1.
General
This section of the manual contains
complete operating instructions for the
AMPTEC 630ES Explosive Safety Igniter
Tester/ Failsafe Ohmmeter. A description of
the front panel controls, connection
instructions, and the theory behind 4-wire
resistance measurement is discussed in this
section.
D-2. Front Panel
Features and Operation
Power Switch
When the front panel power switch is placed
in the OFF/CHARGE position, all power is
removed from the ohmmeter measurement
pins of the J1 connector (see E-6), and the
battery pack is connected to the charging
circuit. When the switch is placed in the ON
position, the battery pack is disconnected
from the charging circuit. In addition the
keyed connector on the 630ES front panel
only allows either connecting
a) the battery
charger
or
connecting b) the test lead set but
not both. The possibility of a common mode
voltage between the device under test and
AC Power ground is therefore completely
eliminated. The operator can not be
concerned if the battery charging adapter is
plugged into the 630ES as it is then
impossible to make any resistance
measurements.
Range Switches
The AMPTEC 630ES input range is selected
by depressing the desired range switch
(silicone boot coated for water resistance) on
the front panel. The pushbutton for the (20
Ohm ) lowest resistance range is just below
the display on the left, (see item 20 of the
630ES Front Panel Diagram.). When a given
range is selected an indicator LED informs
the user. Also note that a resistance range
must be selected after powering up the
630ES in order to place it in an operational
mode.
Calibration Access Screws
Around the perimeter of the 630ES front
panel you will note there are 10 screws
(philips head type) that are used for
calibration access. These screws are meant
to remain intact and should only be removed
by authorized personel (i.e. Calibration Lab
staff).
Function Test Section
The Function Test Section of the 630ES
contains an analog 10 mA fullscale
milliammeter and a variety of test resistors.
With one test lead (i.e. red banana ) plugged
into the meter panel jack and the other test
lead (i.e. black banana lead) plugged into the
common panel jack, the milliammeter will
display the actual test current coming from
the 630ES Igniter Tester.
The test resistors for the Function Test
Section may also be used to verify general
630ES operation. Keep in mind the proper
resistance range should be selected in order
to measure a selected test resistor. You can’t
measure a 1000 ohm resistor on the 20 ohm
range of the 630ES. With one test lead (i.e.
red banana lead ) plugged into the selected
test resistor panel jack and the other test lead
(i.e. black banana lead) plugged into the
common panel jack, the 630ES Igniter
Tester should display a resistance value
close to the labeled value of the resistor.
The 0.1 ohm resistor is commonly used to
