Figure 2. Input attenuator accuracy equipment setup.

TB 9-6625-2339-24

NOTE

If displayed trace is not approximately 5 divisions below the

reference level, press Sweep, Sweep (Cont) key and then

FREQUENCY key. Adjust the RPG knob to place displayed trace

approximately 5 divisions below reference level. Press Single.

(16) Press Peak Search (or Search) key then [Pk-Pk Search] key.

(17) Record absolute value of Mkr1  amplitude indication.

(18) Multiply value recorded in (17) above by 0.426 Hz/dB. Result will be ≤ 2 Hz.

(19) Set all outputs to minimum and disconnect equipment setup.

b. Adjustments. None.

12. Input Attenuator Accuracy

a. Performance Check

(1) Connect equipment as shown in figure 2.

Figure 2. Input attenuator accuracy equipment setup.

(2) Set RF reference source output frequency to 50 MHz and output amplitude to

60 dBm.

(3) Press TI keys as listed in (a) through (k) below:

(a) Preset.

(b) [Factory Preset] (if it is displayed).