Calibration Access Screws
Recessed in the four feet on the bottom of the
AMPTEC 620LM you will note there are 4
screws (phillips head type) that are used for
calibration access. These screws are meant to
remain intact and should only be removed by
authorized personnel (i.e. Calibration Lab staff).
Optional Functional Test Box with built-in
milliammeter
An optional Functional Test Box (option FTB-
620ES) for the AMPTEC 620LM contains an
analog 10 mA full-scale milliammeter and a
variety of test resistors is available from
AMPTEC RESEARCH.
D-1.
General Operation
This section contains operating instructions for the
AMPTEC 620LM Explosive Safety Igniter Tester.
D-2. Front Panel Features and Operation
NO Main Power Switch
The AMPTEC 620LM Igniter Tester was designed
for automated RS232C use (range changes and
measurements via isolated serial computer
interface). The AMPTEC 620LM Igniter Tester is
always hardwired ‘ON”, there is no power ON /
OFF switch. When proper power is applied to the
oolarized rear panel molex connector, the meter is
‘ON”, when rear panel power input is removed it
is “OFF”. Although this “power” is also further
isolated and conditioned inside the meter, this
(special molex jack rear panel input) is the only
source of power for the AMPTEC 620LM.
NO Range Switches
The AMPTEC 620LM has
NO range switches
as
it was
not
designed to be manually operated.
There are No pushbuttons or even test lead jacks
on the front panel.
Over-Range Indication
If the resistance being measured (including "Open
Circuit/ Disconnected states") is a higher value
than the selected range, the instrument's display
will
flash
(blink) , which indicates "overrange" .
Gold Plated Rear Terminal Inputs
The AMPTEC 620LM has no front panel
connections. All reistance measurement inputs are
via the rear panel terminal strip. The AMPTEC
620 user can directly connect a bare wire to the
appropriate termanl screw (
Voltage
High and
Voltage
low , and Current high and Current low
labeled as
V
high,
V
low,
I
high,
I
low .
CHAPTER D - OPERATION, FUNCTIONAL
AND USE
