TB 9-6625-2364-24
(17) Press TI Zero Cal, [Cal], More, [Power Ref On] keys. Record multimeter
indication, (rounded off to two decimal places), as V1.
(18) Disconnect multimeter negative lead from power meter VRF (fig. 3) and connect
multimeter negative lead to power meter chassis ground. Record multimeter
indication as VCOMP.
(19) Calculate the POWER REF output level PRF from the below listed formula:
PRF =
2 VCOMP(V1 -V0) +V02 -V12
Where:
PRF = power reference oscillator output power level
VCOMP = value recorded in (18) above
V1 = value recorded in (17) above
V0 = value recorded in (15) above
R = value recorded in (4) above
Calibration factor = value for thermistor mount at 50 MHz
(20) If calculated PRF is not between 0.991 and 1.009 mW, perform b below.
b. Adjustments
(1) Connect TI POWER REF output to frequency counter A input.
(2) Press TI Zero Cal, [Cal], More, [Power Ref On] keys.
(3) Adjust A2L9 (fig. 4) for 50.0 0.5 MHz.
9