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Chapter 5 - Operations
General
This section of the manual contains complete operating instructions for the Alpha 4314 Series Digital
Igniter Testers. A description of the front panel controls, connection instructions, and the theory behind
4-wire resistance measurement is discussed in this section.
Front Panel
Power Switch
When the front panel power switch is placed in the OFF/CHARGE position, all power is removed from the
output terminals, 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. The possibility of a common
mode voltage between the device under test and AC Power ground is therefore eliminated.
Range Switch
The Model Alpha 4314 input range is selected by depressing the desired button on a multi-station
interlocking pushbutton array located on the right-hand side of the front panel. The pushbutton for the
lowest resistance range is nearest to the POWER switch. LED indicators will point out the range and failsafe
current selected.
Rear Panel
Fuse holder
The fuse holder is mounted on the rear panel and contains a 2 amp in-line fuse. This fuse is designed to
protect the battery pack from excessive charging currents. Customers may request special models with
the fuse holder mounted on the front panel. For continued protection, replace the line fuse only with fuse
of the same voltage and current rating and type. DO NOT use repaired fuses or short-circuited fuse
holders.
Charging Jack
The battery charging jack is a barrel type and is located on the Alpha 4314 rear panel. The center pin of
the connector is positive. The charging requirements of the internal battery pack are 6VDC @300mA. The
correct charging voltage is supplied by the adapter included with the instrument. Additional adapters are
available as Option "A". Customers may request special models with the charger jack mounted on the
front panel.
