TM 9-4910-700-14&P
4.
PROCEDURE.
a.
DWELL METER CALIBRATION
1)
Connect equipment per figure 6-1.
2)
Adjust power supply for a 20 volt signal.
Set the dwell switch on the unit under test to the
3)
4 lobe position and adjust R15 of a full scale (90)
indication on the DWELL meter.
4)
Set the DWELL switch on the unit under test to the
8 lobe position and set R14 for a 45 indication on
the DWELL meter.
Set up equipment as in figure 6-2. Leave unit under
5)
test set on 8 lobe position.
Set pulse generator for a 20 volt pulse at 200 Hz
6)
repetition rate and 2.5 millisecond width.
Adjust repetition rate to exactly 100 Hz and 5
7)
This
millisecond width using electronic counter.
corresponds to an engine RPM of 1500 and a dwell of
22.5.
The meter under test should read between
20.7 and 24.3.
Switch the unit under test to the 4 lobe position.
8)
The meter should now read between 42.3 and 47.7.
b.
1)
Connect equipment per figure 6-3. Set unit under test
to 1000 RPM.
6-2
