Tektronix 434, Инструкция по эксплуатации

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Calibration—434
n. Position the to p o f the display to the b o tto m g ra ti­
cule line.
o. C H E C K —C R T display fo r aberrations ty p ic a lly less
than +4%, —4%, o r a to ta l o f 6% peak to peak.
p.
C onnect the negative-going fast-rise o u tp u t o f the
Square-Wave Generator to the CH 2 in p u t connector.
q. A d ju s t the Square-Wave Generator fo r a six division
display.
r.
Set T R IG G E R SLOPE to — and obtain a stable dis­
play.
s. P osition the b o tto m of the display to the to p o f the
graticule.
t. C H E C K —C RT display fo r aberrations ty p ic a lly less
then +4%. —4%, or a to ta l o f 6% peak to peak.
u. Remove the Square-Wave Generator signal fro m the
CH 2 in p u t co n n e cto r and connect i t to the CH 1 in p u t
connector.
v. Set the V e rtica l Mode to CH 1 and p o sitio n the
b o tto m o f the display to the to p o f the graticule.
w. C H E C K —C RT display fo r aberrations ty p ic a lly less
than +4%, —4%, o r a to ta l o f 6% peak to peak.
x . Reconnect the positive-going fast-rise o u tp u t fro m
the Square-Wave Generator to the CH 1 in p u t co n n e cto r
and set the T R IG G E R SLOPE sw itch to +.
y. Set the CH 1 V O L T S /D IV sw itch to 5 m V .
z. A d ju s t the Square-Wave Generator fo r a six-division
display.
aa. V e rtic a lly center the display using the CH 1 POSI­
T IO N c o n tro l.
ab. C H E C K —C R T display in 1 m V , 2 m V , and 5 m V
positions o f the CH 1 and CH 2 V O L T S /D IV switches.
Refer to Table 5-3. Use the 10X BNC a tte n u a to r as neces­
sary to m aintain a six-division display am p litu d e .
TABLE 5-3
Amplifier Compensation
V O LT S /D IV
Switch Setting
Compensation
Adjustment
Typical
Aberration
5 m V C 225 in Channel 1
C 325 in Channel 2
Less th a n +2%,
-2 % , to ta l o f 2%
peak to peak.
2 m V C223 in Channel 1
C323 in Channel 2
1 m V C 220 in Channel 1
C 320 in Channel 2 Less th a n +3%,
-3 % , to ta l o f 3%
peak to peak.
ac. A D J U S T —Refer to Table 5-3 fo r the correct adjust­
m ent and tolerances. See Fig. 5-9 fo r adjustm ent locations.
ad. D isconnect all test equipm ent.
26. Check V ertical A m p lifie r B andw idth
a. C onnect the o u tp u t o f the M edium -Frequency
C o n sta n t-A m p litu d e Signal Generator to the CH 1 in p u t
connector via a GR to BNC adapter, a 42-inch 50 Ei BNC
cable, a 10X BNC a tte n u a to r, and a 50 £2 BNC te rm in a tio n .
b. Set b o th V O L T S /D IV switches to 10 m V , the V e r­
tical Mode to CH 1, and the T R IG G E R L E V E L c o n tro l
fu lly clockw ise.
c. A d ju s t the signal generator o u tp u t a m p litu d e fo r a
six-division display o f the 50 k ilo h e rtz reference frequency.
d. W ith o u t changing the o u tp u t a m p litu d e , increase the
o u tp u t frequency u n til the display is reduced to 4.2 d iv i­
sions.
e. C H E C K —O u tp u t frequency o f the signal generator
m ust be at least 25 megahertz.
f. Repeat this b a n d w id th check procedure fo r all posi­
tions listed in Table 5-4. Check b o th Channel 1 and
Channel 2.
®
5-19