Note
Width Generator
Table 1 0.3-12. Delay Generator Operation
U220 Pin Mnemonic
Description
State
5
DELC
Delay control voltage input
L
2 ERD
Delay error output signal
L
10 DIC
Delay input store select
See Table 10.3-1
11 to 18 LD7 - LDO Data to be latched into
See Table 10 .3-2
the input store of U220
R226
DVC
Delay vernier current
See Table 10.3-13
6. Verify that voltage at U220 pins 1 , 4 and 5 are at virtual ground
(
min. -40 m V max. 0 V
)
Delay Vernier Current can be checked by measuring the voltage
across R226.
7. Set HP 8 1 12A PER to 20 ms
8. Check the Delay Generator levels against Table 10.3-13
Table 10.3-13. Delay Generator Signal Levels
DEL Setting Voltage across R226
1 ms
+0.16
v
5 ms
+0.003
v
9.99
ms
-0.02
v
1 . Set up the HP 81 12A as follows:
RCL
DEL
DBL
0
650 µs
OT
200 µs
2. Check the input signal from the delay generator at TP2
(
pin
7
of
U240 against Figure 10.3-13.
I
i.._ DBL
I
2 00u s
I
L
_
_
J.---
DEL 6 5 0 u s
----./
Figure 1 0.3-13. Width Generator Input
3. Check the ramp signal at pin 20 of U240 against Figure 10.3- 14.
Servicing the Timing and 1 0.3-1 9
Slope Generators
Summary of Contents for 8112A
Page 6: ......
Page 24: ......
Page 36: ......
Page 44: ......
Page 70: ......
Page 92: ......
Page 144: ...8 32 Testing Performance ...
Page 176: ......
Page 190: ......
Page 194: ...10 2 4 Servicing the Power Supply ...
Page 196: ......
Page 197: ......
Page 216: ......
Page 240: ...10 4 16 Servicing the Shaper and Output Amplifier ...
Page 242: ...A R l BD RY MR I N 1 2 7 I I IJt 51 CR1 B e i 1 _ _ _ _ 20 ...
Page 244: ......
Page 251: ......
Page 262: ...A B A2 ED RY CONTROL ...
Page 270: ......
Page 290: ...R B c R3 BD RY M I CROPROCESSOR 1 2 3 FIGURE 1 0 7 8 ...
Page 294: ... 8 X2l 2 X2 Figure A 1 Mechanical Parts 1 A 2 Replaceable Parts ...
Page 295: ...MP MP3 MP MP2 MP4 MPS MP 1 2 MPS MP MP I B ElElElEl Replaceable Parts A 3 ...
Page 334: ......
Page 378: ...Figure B 14 Mechanical Parts 1 B 44 Backdating ...
Page 380: ......
Page 382: ......
Page 402: ......