Tektronix DC 502

DC 502
4-10 PRE-SCALE
INPUT
J180
DIRECT
INPUT
+20 V
+5 V
>
-20 V>
DC 502 BLOCK DIAGRAM
SIGNAL-SHAPING
CIRCUIT
CR185 Q190 Q195
CR186 U190 Q198
CR187 U160C
CR188
A
STEERING
GATE
U160B
19B 7A25B 24B
LATCH
----------------- O
A
11 \
SCAN
+8
CLOCK
COUNTER
U260A
— <
• — >
U262A
U260B
U262B
U260D
U263A
25A
TIME
SLOT
DECODER
19A, 20A, 20B, 21B
A
U265
J100
TRIGGER
LEVEL
■O
a
v
1-MHz CLOCK
Y200
GATE GENERATOR
GATE
U200A U200C J
U200B
U200D
U220A
U220B
U222A
U222B
LATCH
I
I
I
I
L
OPTIONAL
1-MHz
CLOCK
Y201
U201
REGULATED
SUPPLIES
"1
U300
U320 — J — £
0330
T" Q340
I ______
I
I
I
I
I
DECADE
DIVIDER
UNITS
U209
U210
U211
U212
U213
U214
U215
.01 SEC
.1 SEC
1 SEC
IO SEC
CONTROL SIGNALS
U230A U246D
U230B
U230C
U230D
MEAS
INTER
SWITCH
S200
A
CLEAR
CLEAR
RESET
>■
>
>■
>
10° DCU
STORAGE
U165A
U165B
U167
U169
10 1 DCU
U235
10 3 DCU
U236
REGISTER
U250
U251
U252
U253
U254
U255
U256
10 3 DCU
U237
10 4 DCU
U238
10 s DCU
U239
10 6 DCU
U240
A
OVERFLOW
REGISTER
U241A
U241B
Q242
OVERFLOW
RESET
4 BCD OUTPUT
LINES
v
6 TIME-SLOT
LINES
T Sl _ TS 7
LEADING-ZERO
SUPPRESSION
&
DECIMAL POINT
LOCATION
U245B
U246A
U246B
U260C
U263B
INVERTERS
U246C U267D
U267A U267E
U267B U267F
U267C
-0-
SEVEN 
SEGMENT
DECODER
& DRIVER
U270
n
7 segment
lines
DISPLAY
LED's
DS280
DS281
DS282
DS283
DS284
DS285
DS286
A
ANODE
VOLTAGE
ENABLE
Q280
Q281
Q282
Q283
Q284
Q285
Q286
BLOCK
DIAGRAM
3-11