TB 9-6625-2002-35
11. Attenuation
a. Performance Check
(1) Connect TI ∼ 600 OHM output to the audio analyzer INPUT HIGH through a
600 Ω feedthrough termination (voltage divider, model 11047A). Position audio analyzer
controls to measure V rms.
(2) Position controls as listed in (a) through (c) below:
(a) FREQUENCY Hz dial to 1.
(b) MULTIPLIER X1K pushbutton pressed.
(c) VAR ATTENUATOR control adjusted for a 2 V rms indication on the audio analyzer.
(3) Press STEP ATTENUATOR 10 pushbutton.
Audio analyzer will indicate
between .618 and .645 V rms.
(4) Release STEP ATTEN 10 pushbutton and press STEP ATTEN 20 pushbutton.
Audio analyzer will indicate between .196 and .204 V rms.
(5) Release STEP ATTEN 20 pushbutton and press STEP ATTEN 40 pushbutton.
Audio analyzer will indicate between .0196 and .0204 V rms.
b. Adjustments. No adjustments can be made.
a. Performance Check
NOTE
Do not use 50 Ω input impedance on oscilloscope. Mismatching
will result.
(1) Connect TI
600 OHM output to the oscilloscope Vertical 1 input through a
600 Ω feedthrough termination (voltage divider, model 11047A).
(2) Position controls as listed in (a) through (d) below:
(a)
FREQUENCY Hz dial to 1.
(b)
MULTIPLIER X1K pushbutton pressed.
(c)
VAR ATTENUATOR/AMPLITUDE control fully cw.
(d)
STEP ATTEN pushbuttons released.
(3) Measure square wave amplitude.
Square wave amplitude as indicated on
oscilloscope will be 2.25 to 2.75 V.
(4) Adjust FREQUENCY Hz dial to 5 and press MULTIPLIER X100K
pushbutton. Rise and falltime of displayed square wave will be 50 ns or less.
