F-1.
General
This section of the manual contains routine
maintenance information regarding the AMPTEC
RESEARCH 630ES 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 630ES Igniter Tester is a four wire
Kelvin ohmmeter.
The AMPTEC
Igniter
Tester must be calibrated using four wire Kelvin
connections to the resistance standard
in order to
eliminate lead resistance and contact resistance
errors. The
Option “630-304”
is a Gold Plated 4
Wire Kelvin ( or equivalent) Banana Jack Test Lead
Set that should be used to calibrate the AMPTEC
630ES Igniter Tester. The 4-wire configuration is
maintained up to the point of the connection to the
resistance standard.
F-2.
Required Test Equipment
Following standard resistors are required to calibrate
the 630ES Igniter Tester .
Precision Resistors:
0.001 ohm ± 0.01% Accuracy (2 Ohm
zero
)
0.1 ohm ± 0.01% Accuracy (20-20K Ohm
zero
)
1.0 ohms ± 0.005% Accuracy (2 ohm
fullscale
)
10 ohms ± 0.005% Accuracy (20 ohm
verify
)
100 ohms ± 0.005% Accuracy (200 ohm
fullscale
)
100 KOhm ± 0.005% Accuracy (200 Kohm
verify
)
Test Leads:
4-wire Kelvin Test Lead set or AMPTEC
Option "630-304" Kelvin 4 Wire Banana Test Leads
F-3.
Calibration Procedure
The AMPTEC
630ES should be calibrated with fully
charged batteries
(NICAD)
and should be allowed to
warm-up
for a minimum of 15
630ES
minutes
before
beginning the calibration procedure. Some
calibration adjustments are accessed by removing
the calibration access screws (
cont next column
)
in the top-plate perimeter of the unit. Use the
two handles (careful not to break any umbilical
cabling to the main PCB) to lift up the top plate
to access most of the main PCB RV trimpots.
The locations of the adjustments are shown on
drawing number 630-600 at the back of this
manual.
F-3-1. Zero Offset Adjustment
(20 ohm and
higher ranges)
1.
Select the 20 ohm range. Connect the Kelvin
leads to the 0.1 ohm standard resistor.
2.
Adjust potentiometer RV2 (
) for a display indication of 00.10
Ohms .
Do not over adjust RV2 past a 0.00
reading
. A false or negative polarity 0.010
display reading offset error can be created. This
calibration error has the display appearing
normal (even though a negative 0.010 offset has
been created ) - the display doesn't indicate a
negative sign).
F-3-2. Full Scale Adjustment
(20 ohm and
higher ranges)
1.
Select the 200 ohm range. Connect the
Kelvin leads to the 100 ohm standard resistor.
2.
Adjust RV1 for a display reading of 100.00.
1.
Select the 2 ohm range. Connect the 4 wire
Kelvin leads to the 0.001 ohm standard resistor.
2.
Adjust potentiometer RV5 (on the main PCB)
for a display indication of 0.0010 Ohms .
Do
not over adjust RV5 past a 0.00 reading
. A
false or negative polarity 0.0010 display reading
offset error can be created. This calibration
error (
mis-adjusted beyond zero
) has the display
appearing normal (even though a negative
0.0010 offset has been created ) - the display
doesn't indicate a negative sign)
the front panel
zero pot located on the top plate - not found on
the main PCB
F-3-3 2.0 Ohm Range Zero adjustment
