SECTION D - OPERATION, FUNCTIONAL
SELF - TEST AND USE
The AMPTEC 620VN ohms ranges can be
computer controller selected via the RS232C
interface (see rear panel).
Gold Plated Five way
Input Jacks
The AMPTEC 620 front panel input jacks are a
gold plated variety that readily accept a number
of user connection modalities. The unit's
banana post input jacks may be unscrewed
several turns to exposed a horizontal hole thru
the gold plated post. The AMPTEC 620 user can
directly connect a bare wire thru the banana post
(horizontal hole). The AMPTEC 620 front panel
input posts also accept wires with spade lugs,
and or banana jacks. The front panel or rear
panel terminal strip inputs are wire for Voltage
High and Voltage low , and Current high and
Current low (resistance measurements). The
spacing of the front panel jacks only allow
horizontal connection of the dual banana jack
test leads to prevent mis-connection (i.e. during
calibration) .
Calibration Access Screws
Recessed in the feet on the bottom side of the
AMPTEC 620VN meter there are 4 screws
(phillips type). When removed you can "remove
the lid" and access the main internal electronics
/PCB and calibration “adjustment potentiom-
eters. They (
feet screws
) are normally meant to
remain intact and to be removed by authorized
Repair and Calibration Lab staff.
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" . whichis also available via the
automated control
RS232C Interface.
D-1.
General Operation
This section contains operating instructions for
the AMPTEC 620VN Explosive Safety Igniter
Tester.
D-2. Front Panel Features and Operation
When the front panel power switch
is in the “OFF” position, all power
is removed from the unit’s main
PCB and the unit’s RS232C interface. When the
620VN main power switch is placed in the
power “ON” position, the unit powers up all
ohms and related measurement circuitry and
allows the optically RS232C interface located
on the unit’s rear panel to also operate remotely.
Resistance Range Switches
The 4 ½ digit display can display up to 19.999
ohms on the 20 ohm range and 199.99 ohms on
the 200 ohm range. The 2.0 Megohm range can
display resistance readings up to 1.9999
Megohms. The meter can display from readings
0000 to 19,999 (decimal point position varies
with the selected range). That is referred to as
20,000 counts, which is common for 4 ½ dight
meters. The user can depress (feel a “click”) one
of the meter’s range latching switches to select
the desired resistance range. The prior range
switch button will “pop out” when a new range
is selected.
The far right front panel switch labeled
“REMOTE RS232C” must be selected (clicked
in) to get the meter to accept remote commands
via the RS232C (rear panel) serial interface.
When the “REMOTE RS232C” mode is
selected all the meters manually selected
resistance range switches should “pop out” or
be de-selected. In this way, There is no manual
selected range and meter is ready to accept
remote RS232C computer commands for range
and reading control.
OFF
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