Adjust X1; High Frequency Common-Mode Rejec - Tektronix 1A5 Instruction Manual

Calibration — Type 1A5
Type 1A5 Contro
P O S ITIO N
A Input AC - GND-DC
B Input AC-GND-DC
VOLT S/ CM
VARIABLE
DISPLAY
Type 544 Osc
Triggering Mode
Triggering Source
Time/cm
Horizontal Display
Cons t ant Amplitude S
F re quency
Amplitude
Variable
Amplitude R a nge
15. Adjus t X 1 High Frequency Common-
Mode R e jection (C267, C 1 22, C
C 2 23, C 1 63, C263)
a. Equi q m en t s etu p i s s how
adjustments and test points are shown in Fig. 6-18.
6-18
Fig. 6-17. E q u
l s
Midrange
GND
GND
20 mV
CAL
A-B
i llosope Contro l s
Auto S ta bility
Norm
.2 ms
Norm ( ×1 )
i ne Wave Generator
1 MHz
50
Cal
.5-5 V
2 22, C 1 23,
n i n ni g. 6 - 17. L ocat io n s of
i pment setup for step 15.
b. Using the test s tra
location during the P
to TP 260. See F i g. 6-18 for test point locations.
Use extreme care if the test s
the Type 1A5 is energized.
briefly de-energized while connecting the TEST
STR A P, allow 5 minutes or more warm-up time after
power is re - applied.
c. Connect the two s
nec t or to the A and B INPUTS of the Type 1A5. Connect the
center of the T connector to a GR to B
Connect the Type 191 Cons
(item 4) to the GR adapter, us
d. Set the Cons t ant Amplitude S
10 V-l MHz output. (An amplitude s
191 P r ovides 10 V to the 1 M Ω input of the Type 1A5 when no
50 Ω termination is us
e. Set the VOLT S/
control to m i drange and adjust R
neces sar y to position trace at the center of the graticule.
f. S i multaneously switch the A and B Input AC-GND-DC
switches to DC.
g. ADJUST — C267 ( Fi
tude (optimum common-mode rejection).
p, (removed from its Type 1A5 s
rel iminary P ro c e dure), connect TP 160
WARNING
tr ap is attached while
If the Type 1A5 is
y mmetrical ends of a flexible T con ­
N C adapter (item 12).
ta nt Amplitude Signal Generator
i ng its 5 ns GR c a ble.
i gnal Generator for a
ett ing of 5 V on the Typq
e d.)
CM switch to 1 mV. Set the P
17 0 (DC BAL, Fig. 6-18) as
g. 6 - 18) f or minimum display ampli
t o r age
O S ITIO N
­