Alternate Variable Attenuation Measurement (10 MHz to 18 GHz).

TB 9-4931-523-35

APPENDIX C

(10) Press the RATIO key to deactivate, then press the GOLD (S) TUNED RF

LEVEL, 39.9 SPCL, 3.7 SPCL, and 1.9 SPCL keys.

(11) Note the power meter reading and record it as 'Power Meter Reading' in table C1

alongside the appropriate test frequency.

(12) Note the measuring receiver reading and record it as 'Init dB' reading in table

C1 alongside the appropriate test frequency.

(13) Press the TI BLUE (SHIFT) key and then the SET REF (ZERO) key.

(14) Calculate the first cal point using the formula -40 + signal generator No. 1

output level Init dB reading. (Example -40 dBm + (6 dBm) - (-3 dBm) = -31 dBm). Record

this value, as 'First Cal Point' in table C1 alongside the appropriate test frequency.

(15) Set signal generator No. 1 to the level calculated in (14) above and press the

CALIBRATE key.

(16) Calculate the second cal point using the formula -80 + signal generator No.1

(No.2) output level 40 dBm to result of step (14). (Example -80 dBm + (6 dBm) - (-3 dBm)

= -71 dBm). Record this value, as 'Second Cal Point' in table C1 alongside the appropriate

test frequency.

(17) Set signal generator No. 1 to the level calculated in (16) above and press the

CALIBRATE key.

(18) Set signal generator No. 1 to the initial level of +6 dBm.

(19) Press 38.2 and SPCL keys and record the displayed value as 'First RF CAL

FAC' in table C1 alongside the appropriate test frequency.

(20) Press 38.3 and SPCL keys and record the displayed value as 'Second RF CAL

FAC' in table C1 alongside the appropriate test frequency.

(21) Press 38.4 and SPCL keys and record the displayed value as 'Set Ref CAL FAC'

in table C1 alongside the appropriate test frequency.

(22) Remove TI from setup and repeat steps (4) through (21) for each of the test

frequencies in table C1.

(23) Press the FREQ and BLUE (SHIFT) AUTO TUNING keys.

(24) Set signal generator No. 1 to appropriate test frequency listed in table C1.

NOTE

For frequencies below 1.3 GHz proceed to step (27) below.

(25) Press 27.3 SPCL, enter the appropriate offset frequency from table C1, and

press the MHz key. (Ignore the displayed frequency reading.)

(26) Set signal generator No. 2 for an output of +8 dBm and the appropriate offset

frequency from table C1.

(27) Press the GOLD(S) and TUNED RF LEVEL, 26.1 and SPCL keys.

C-3