Tektronix TYPE 109, Instruction Manual, Page: 19 / 56

Applications— Type 109
F ig . 3 - 9 . A p p ly in g a fa s t- ris e p ulse from the T yp e 1 0 9 to the in p ut of a T yp e 5 4 0 - S e rie s O s c illo ­
sco p e . The illu s tra tio n sh o w s the setup th a t w a s used an d the re su lta n t w a v e fo rm .
TABLE 3-1
CRT REFERENCE CHART
TEKTRONIX O SCILLO SCOPE
TYPE (includes rackmounts)*
CRT
(Type No.)
N OM INAL VERT.
DEFLECTION
FACTOR-
volts/cm
N OM INAL
RISETIME-
nsec
COMPARATIVE
W RITIN G
RATE**
531, 535 T51 11.0 to 14.0 2.0
Vs to %
531 A , 533, 535A T533 8.5 to 10.5 2.0
V s to y 4
541, 545 T54 6.0 to 7.0 2.5
V s
to
y 4
541 A , 543, 545A T543 6.0 to 7.0 2.5
V s
to
y
4
551 T551 6.0 to 6.5 3.0
V s
to
y
4
555 T555 6.4 to 7.3 3.0
V s to y
4
517A (12 kv) T517 (T54-H) 7.0 to 8.0 2.0
Vs
517A (24 kv) T517 (T54-H) 14.0 to 16.0 1.5
l
517 (12 kv) 5XP 17.0 to 30.0 1.5
Vs
517 (24 kv) 5XP 34.0 to 40.0 1.0
1
* R e fe r to the In stru clio n M a n u a l fo r the o sc illo sc o p e you a re usin g to d e te rm in e sw e e p -ra te lim ita tio n s.
* * W ritin g ra te co m p are d to T yp e 5 1 7 crt, 2 4 k v , P I 1 p h o sp h o r. W ritin g ra te of T 5 1 7 P 1 1 at 2 4 kv is 1 0 0 0 to 1 2 0 0 cm /fi sec record ed
on T R I-X film a t f l . 9 w ith 4 .2 to 1 red u ctio n. W ritin g ra te is in c re a se d by a fa cto r of 2 to 3 using P O LA R O ID 3 0 0 0 speed film ,
even fa s te r fo r p re fo g g e d film . W ritin g ra te is a fun ctio n of film s p e e d , lens f-sto p , o p tica l red uctio n fa c to r, typ e of p h o sp h o r, se n s i­
tiv ity o f film to co lo r o f p h o sp h o r, a c c e le ra tin g p o te n tia l, an d beam cu rre n t. C o n su lt y o u r lo cal T e k tro n ix Field E n g in e e r or O v e r ­
se a s R e p re se n ta tive fo r more in fo rm a tio n on w ritin g ra te s a n d p h o sp h o rs.
the pulse from the Type 109 was applied to the Type K
Unit to show how the pulse rise and fall times are limited
by the bandwidth of the vertical amplifier.
Fig. 3-10 shows the setup which was used to apply the
Type 109 pulse to the vertical deflection plates through a
Deflection Plate Connector (Part No. 013-017). The result­
ant waveform is shown in the same illustration. The deflec­
tion plate connector circuit that was used is similar to the
one shown in Fig. 3-11 except C3 and R5 were not added.
The rolloff and gradual slope of the fop portion of the
waveform is caused by the use of the 120-nsec RG-8A/U
cable. A long cable is necessary to obtain sufficient delay
to display the leading edge of the waveform on the crt
screen.
To obtain the best results, C3 and R5 were added (See
Fig. 3-11). The setup and the resultant waveform are shown
in Fig. 3-12. Even by using two Type 113’s that contain
high-quality cable, some rolloff occurred and components
C3 and R5 had to be added to sharpen the leading corner
and make the top of the waveform as horizontal as possi­
ble. If cw signals are applied to the deflection plate con­
nector instead of pulses from the Type 109, remove C3, R5,
and the Type 113’s. Use a short 50-ohm GR-8A/U cable
in place of the Type 113's.
By inserting a test device in series with the signal delay
cable using the same setup shown in Fig. 3-12, you can
observe and measure not only the output of the device but
also the time delay introduced by the device. If the device
is linear, it is unimportant where the device is inserted into
the signal delay cable. If the device is nonlinear, if may be
advantageous to place the device between the delay cable
and the deflection plate connector, especially if the delay
cable risetime is significant, as when RG-8A/U cable is
used in place of the two Type 113’s.
3-7