TB 9-6625-2250-35
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
table 4 from the
current [ATTEN] setting actual ∆
MKR indication recorded in
table 4 and
then subtract 10 dB from the results. Difference will be between -1.8 and +1.8 dB for each
setting.
EXAMPLE:
(Current)
(Previous)
30 dB step-to-step
TI [ATTEN] 30 dB
TI [ATTEN] 20 dB
accuracy
=
(actual ∆ MKR indication
actual ∆ MKR indication) - 10 dB
-
(14) Set synthesizer/level generator amplitude to +10 dBm and AMPTD INCR to 5 dB.
(15) Press TI keys and enter values using DATA keys as listed in (a) through (i)
below:
(a)
INSTRUMENT STATE PRESET.
(b)
[REALIGN LO & IF] wait for ADJUST STATUS messages to disappear.
(c)
(d)
SPAN then [ZERO SPAN].
(e)
AMPLITUDE then [REF LVL] to -10 dBm.
(f)
[LOG dB/DIV] to 1 dB.
(g)
[ATTEN] to 0 dB.
(h)
CONTROL [RES BW] to 1 kHz.
(i)
[VIDEO BW] to 1 Hz.
(16) Set attenuator No. 1 to 5 dB and replace 20 dB attenuator (fixed) in equipment
setup with 10 dB attenuator (fixed).
15