TB 9-6625-2250-24
(k) [VIDEO BW] to 1 Hz.
(4) Set attenuator No. 1 to 0 dB.
NOTE
Attenuator (fixed) listed in table 2 may be substituted in
equipment setup as necessary to obtain TI reference level in (5)
and (17) below.
(5) Adjust attenuator No. 1 to position signal peak 2 to 3 divisions below TI
reference level.
(6) Press TI keys as listed in (a) through (e) below:
CONTROL TRIG.
(a)
[SINGLE].
(b)
[SINGLE].
(c)
MARKER ON.
(d)
[MARKER DELTA].
(e)
(7) Press synthesizer/level generator AMPLITUDE key.
(8) Press synthesizer/level generator INCR
key.
(9) Press TI AMPLITUDE key then [REF LVL] to -60 dBm and [ATTEN] to 20 dB.
(10) Press TI CONTROL TRIG key then [SINGLE] key and wait for completion of
MKR indication will be within limits specified in table 4. Record
MKR
sweep. TI
indication as actual MKR indication in table 4.
Table 4. Input Attenuator Accuracy
Synthesizer/level
Test instrument
(REF LVL)
[ATTEN]
generator
MKR indications
settings
settings
amplitude settings
(dB)
(dBm)
(dBm)
(dB)
Min
Max
Actual
-40
-60
20
+6.5
+13.5
-30
-50
30
+16.5
+23.5
-20
-40
40
+26.5
+33.5
-10
-30
50
+36.5
+43.5
0
-20
60
+46.5
+53.5
+10
-10
70
+56.5
+63.5
(11) Repeat (8) through (10) above for remaining synthesizer/level generator
amplitude, TI [REF LVL] and [ATTEN] settings listed in table 4.
(12) Calculate the step-to-step accuracy for TI [ATTEN] 20 dB setting by subtracting
10 dB from the actual MKR indication recorded in table 4 for [ATTEN] 20 dB setting.
Difference will be between -1.8 and +1.8 dB.
(13) Calculate the step-to-step accuracy for TI [ATTEN] 30, 40, 50, 60 and 70 dB
settings by subtracting previous [ATTEN] setting actual
MKR indication recorded in
14
