Peak-To-Peak Voltage Measurements- Ac; Instantaneous Vo Ltag E; Measurements-Dc; Sweep Display - Tektronix 475 Instruction Manual

Push th e TRIG V IEW button and hold It in. Us e t he
DELAY TIME POSITION con t rol to move the r efere nc e
po int to
th e center ho ri zo n tal q raticufe li
ne (see Fig.
13.
Po int A ). Use the A LT D ELAY con tra l to move the ti me-
measu re men t p o int to th e ce nte r h
or izonta l q raticute nne
on th e next cy cle (see Fig 13, Poin t B) . Veri fy th e readout
is 16 .49 to 16.84 a nd the rns lamp is lit
I
, ~ J.
<a
• ~
~
1\
I
,
1
"
I
0 ,
I
1 73a-1 5
f ig. 13. OM44 timing ch eCk.
E xt ernal H oriz ontal G ain Check
(It X-Y o p e rati o n is to be us ed .) Use steps
1
through
3
o f
th e Bas ic Osci ll oscope Di spl ay s procedure
for
obtain ing a
No rma l Sw ee p D isp lay o f the c a ibrator sq uare-wa ve
vo ltag e wa vef orm ; then, set the TIME/DIV sw it ch to X-Y o
With th e ca lib rat or sig nal c o n nec ted to the C H 1 OR X
input conn ec to r a nd th e CH 1 VOL TS /DIV switch set to
50 mV, the crt d ispl ay should be two dots separated
h orizo ntally by 5.75 to 6 .25 divisions.
PEA K-T O -PEA K VOLTAGE
ME ASUREMENTS- A C
Obtain a No rm a l Display , Make sure the V AR
VOL TS /DtV control is in the calibrated d etent. Vertically
position the d isplay so the lowe r portion coincides w ith a
horizontal
qratrcute
line (see Fig, 14 . Poi nt A) Horizonta lly
posit ion the display so one
ct
th e upper pea ks co incides
with the cen te r ve rti ca l g raticule line (see Fig , 14 . Poin t B ).
Measure the vertical deflection ' ro m peak- to -peak (Po i nt
A to Point B)
@ 475 /D M 44 Ope rato rs
31
M u lt iply the v ert ic al def lect ion just measured by the
VOL T S/DIV switch sett ing A lso in cl ude the atte nuation
fact or of the pr obe if th e pr obe does not have a scal e-
factor sw itching c on nec to r.
Substituting the given values'
Example : The peak-to-peak
measured is 4.6 d ivis io ns (see Fig
sw itc h sett ing of
.5.
POSITION TO
CEN TE R LI N E
' .
B
•
,.
l
~
-
-
~
--I
1 \
~(A
II
,
I I
,
'I
VERTICA L
~
/
DEFLECT ION
. .
J
,
" 'J !L
0
MEASURE AMPLITUOE
FRO MATDB
( 1 7 3 8 16 12 0 3 9 · 1 5
Fig . 14. Peak -la -peak vol tage o f a ..... ave form.
Usi ng th e formu la :
Volts
Peak-t o-peak
vertic al
deflection
(d ivisio n s)
vertical deflection
14) with a VOLT SIDIV
X VO LTS/DIV
se tting
NOT E
If 'he ampJirude measurement
IS
cnucet or if the
tra ce
is
thick
as a
result of hum and' o r none on Ihe
Signa l,
a
more accurate measurement c an be ob·
tetnea by measur,ng from the top o t a peak 10 the top
of a 'rIal/ey. This
Will
soc rrecr
the trace thic kness from
the measurement.
Volts Peak-to-Peak = 46 X 0,5 V = 2.3 valls.
INSTANTANEOUS VOLTAGE
MEASUREMENTS-DC
Ob tain
a
Normal Display , Make sure the VAR
ValT Si O IV con trol is in the ca librated detent.
32
47 5/0M 44 Operators @