TB 6-6625-2329-24
Table 9. RF Attenuator Accuracy (Non-interrupted)
Measuring receiver indications
Test instrument
VARIATION
(dBm)
STEP
(dBm)
Min
Max
-5
-4.8
-5.2
-10
-9.5
-10.5
-15
-14.5
-15.5
-20
-19.5
-20.5
(12) Press SHIFT INSTR PRESET
PARAMETER LEVEL
pushbuttons,
pushbutton, and press ON/OFF OFF key.
(13) Disconnect measuring receiver SENSOR MODULE from TI RF 50 .
b. Adjustments. No adjustments can be made.
11. Spectral Purity
a. Performance Check
(1) Connect equipment as shown in figure 5.
Figure 5. Spectral purity.
(2) Press SHIFT INSTR PRESET pushbuttons.
(3) Adjust controls as listed in (a) through (c) below for each row in table 10 below.
(a) Press TI PARAMETER RF pushbutton, enter DATA numerical value, and
press ENTER/UNITS MHz key.
(b) Press TI PARAMETER LEVEL pushbutton, enter DATA numerical value
and press ENTER/UNITS dBm key.
(c) Set spectrum analyzer to TI frequency, set power reference then tune to
NOTE
Some spurious signals may be generated by the spectrum
analyzer. If a spurious signal is present, change TI frequency.
If it disappears, it most likely is from the TI. If the spurious
signal moves with the TI frequency, it most likely is in the
spectrum analyzer.