TB 1-4920-443-35
CEC 2700 oscillator pins A+ and B- from J2 connector to Pins A and B of the cable connector.
(3) Set the oscillator output to 500 mV p-p. Set the frequency to each set point shown in the table below.
(4) At each set point, record the frequency indications from the calculating counter and AEDATS. Verify
that those indications are within the tolerances specified in the table.
NOTE
To read frequency on a calculating counter channel, enter 4-10000-0 in the thumb switches.
To read frequency with AEDATS 2, refer to the AEDATS (H345-1) Operator's manual, or for
AEDATS IV, refer to the AEDATS IV (H355-7) Operator's manual.
Table 23-1 Oscillator Settings for T53/T55/T64 Fuel Flow (Frequency) Alignment
Oscillator Calculating Counter Calculating Counter AEDATS WF
AEDATS WF
(Hz)
Limits ( 1 Hz)
Reading (Hz)
Limits ( 1 Hz) Reading (Hz)
250
249-251
249-251
500
499-501
499-501
750
749-751
749-751
1000
999-1001
999-1001
1250
1249-1251
1249-1251
(5) Enter the calculated "C" factor in the Calculating Counter CH 4 C thumb switches, in the five switch
positions marked "C". Reference paragraph 23 to determine "C" factor.
(6) Verify that AEDATS Alignment was done in paragraph 24. Using the flowmeter data obtained in that
paragraph, fill-in the columns labeled "Flowmeter Hz" and "Flowmeter PPH" of the table below.
Table 23-2 Oscillator Settings for T53/T55/T64 Fuel Flow (lb/hr) Alignment
Target Flowmeter Hz
Flowmeter
Calculating Cntr.
Calc.
AEDATS WFi PPH
AEDATS
Freq. from table 21-
PPH
Limits
Counter
Limits
WFi
(Hz)
1
from table 21-
(calculated as
Reading
(calculated as
Reading
1
follows)
follows)
Flowmeter PPH
Flowmeter PPH
0.5%
0.35%
250
500
750
1000
1250
Note: Calculating Counter Reading = Oscillator Frequency x C, where C is calculated in paragraph 21.
(7) Connect the thermocouple calibrator to the fuel temperature thermocouple connector (TC208) Pins A
(+) and B (-). Set the output for Type J output at a temperature that corresponds to calibration
temperature from the flowmeter calibration sheet.
(8) Set the oscillator output to 500 mV p-p. Set the frequency to each of the set points in the "Flowmeter
Hz" column of the table above. Record the fuel flow indications from the calculating counter and
AEDATS and verify that those indications are within the specified tolerances.
(9) Reconnect the fuel flowmeter cable and fuel thermocouple.
(10)The turbine flowmeter should be calibrated by a qualified laboratory every twelve (12) months.
