F-1.
General
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This section of the manual contains routine
maintenance information regarding the
AMPTEC RESEARCH Model 640 series
igniter tester. Calibration should be performed
on a regular basis to ensure continued
instrument accuracy or following a main PCB
electronic component repair/replacement. The
recommended calibration interval is 1 year.
The AMPTEC 640 series igniter tester is a four
wire Kelvin ohmmeter.
in order to eliminate lead resistance and contact
resistance errors. The Option “640-305” has
twin single banana plugs (meter and common)
terminated with the 640 series igniter tester
style keyed connector. One banana plug has a
ring at the tip(Voltage high and Current
High) and one banana plug lead end has a
ring at the tip (Voltage low and Current low) .
The 4-wire configuration is maintained up to the
point of the banana plug, eliminating most
cable resistance effects. Typically 2m of in
series resistance is associated with the
AMPTEC “OP640-305" two single banana lead
set.
Note:
the option "640-305" a 48" long
replacement cable set normally supplied as part
of the AMPTEC 640 package may have too
much resistance offset for the actual calibration
of 640 Igniter Testers versions fitted with a low
2.0 Ohm range. Contact AMPTEC for
information on the “OP400-300" 48" long 4
wire Kelvin Calibration Lead Set all terminated
with single banana jacks.
The 640 series igniter
tester must be calibrated using four wire
Kelvin connections to the resistance standard
W
Only for 640 versions with a 2 Ohm
range:
F-2.
Required Test Equipment
F-3.
Calibration Procedure
warm-up
5
minutes
F-3-1. Zero Offset Adjustment
1.
2.
F-3-2. Full Scale Adjustment
1.
Following standard resistors are required to
calibrate the 640N Igniter Tester .
0.1 ohm ± 0.01% Accuracy
10 ohms ± 0.005% Accuracy
100 Kohms ± 0.01% Accuracy
1 Megohm ± 0.01% Accuracy
4-wire lead set or
AMPTEC
The 640 series igniter tester should be calibrated
with fully charged batteries and should be
allowed to
for a minimum of 1
before beginning the calibration
procedure. The calibration adjustments are
accessed by removing the 10 calibration access
screws around the perimeter of the 640 series
igniter tester front panel, then lifting off the top
plate by the handles. The locations of the
adjustments are shown on drawing number
640N-600 at the back of this manual.
Select the 20 range. Connect the Kelvin
clips to the 0.1 ohm standard resistor.
Adjust potentiometer RV2 for a display
indication of 0.100 .
clips
to
the
100
0
ohm
standard
resistor.
Precision Resistors:
1000 ohms ± 0.005% Accuracy
Test Leads:
(
Option "640-305")
S
Select
the
200
0
ohm
range.
Connect
the
Kelvin
Summary of Contents for 640N
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