Adjust High Frequency Compensation (R304, R305, R341, And C304) - Tektronix 2212 Service Manual

Adjustment Procedures
5- 14
Adjust High Frequency Compensation
(R304, R305, R341,
and
C304)
Procedure
a. Set:
SEC/DIV ........................ ..
CH1 VOLTS/DIV ............ .
0.2 µs
10mV
b. Connect the positive-going fast-rise square wave output from
the calibration generator via a 50
Q
BNC coaxial cable, a 10X
BNC attenuator, and a 50
n
termination to the CH 1 OR X
input connector.
c. Set the pulse generator to produce a 1 MHz, five-division
display.
d. Set the top of the displayed waveform to the center horizontal
graticule line using CH 1 POSITION control.
e. Adjust : Compensation (R304, R305, R341 and C304) for a
response as flat as possible. Repeat adjustments until no
further improvements are noted.
f. Set: CH 1 VOLTS/DIV to 5 m V.
g. Set the pulse generator for a five-division signal.
h. Check for aberrations less than ±6% (0.3 division).
i. Set: CH 1 VOLTS/DIV to 10 mV.
j. Set the pulse generator for a five-division signal.
k. Check for aberrations of ±4% (0.2 division) or less.
1.
Repeat part k for each CH 1 VOLTS/DIV switch setting from
20 mV through 0.2 V. Adjust the pulse generator output and
add or remove the 10X BNC attenuator as necessary to
maintain a five-division display at each VOLTS/DIV switch
setting.
NOTE
Some generators do not produce enough signal amplitude to test
above
0.2
volts/div. Omit steps m through q,
if
necessary.
Adjustment