TB 9-6625-2250-24
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
=
MKR indication
actual MKR indication) - 10 dB
(actual
-
(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:
INSTRUMENT STATE PRESET.
(a)
[REALIGN LO & IF] wait for ADJUST STATUS messages to disappear.
(b)
(c)
SPAN then [ZERO SPAN].
(d)
AMPLITUDE then [REF LVL] to -10 dBm.
(e)
[LOG dB/DIV] to 1 dB.
(f)
[ATTEN] to 0 dB.
(g)
CONTROL [RES BW] to 1 kHz.
(h)
[VIDEO BW] to 1 Hz.
(i)
(16) Set attenuator No. 1 to 5 dB and replace 20 dB attenuator (fixed) in equipment
setup with 10 dB attenuator (fixed).
(17) Adjust attenuator No. 1 to position trace 2 to 3 divisions below TI reference level.
(18) Press TI MARKER ON key then [MARKER DELTA] key.
(19) Press synthesizer/level generator AMPLITUDE key.
(20) Press synthesizer/level generator INCR
key.
M
(21) Press TI AMPLITUDE key then [REF LVL] to 15 dBm. Record actual
KR indication for TI [REF LVL] 15 dBm setting in table 5.
(22) Subtract ideal MKR value from actual MKR indication listed in table 5 and
record difference as IF GAIN DEVIATION in table 5.
(23) Repeat (20) through (22) above for remaining synthesizer/level generator
amplitude and TI [REF LVL] settings listed in table 5.
(24) Calculate the IF GAIN CORRECTION for [ATTEN] 20 dB setting in table 6
by subtracting the IF GAIN DEVIATION value recorded for [REF LVL] 40 dBm setting
in table 5 from the IF GAIN DEVIATION value recorded for [REF LVL] 50 dBm setting
in table 5 as in EXAMPLE below. Record difference as IF GAIN CORRECTION in table 6.
15