HP 8112A Operating, Programming And Servicing Manual page 224
50 mhz programmable pulse generator
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- Operating, programming and servicing manual (112 pages) ,
- Operating, programming and servicing manual (406 pages)
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Note
1 0.3-22 Servicing the Timing and
Slope Generators
5. Verify that the voltages at U301 pins 1 1 / 1 5 are at REF voltage
(typ. + l .85 V)
6. Verify that the voltage at U301 pin 13 is at TTL LOW level ( typ.
+90 mV)
Range Decoder
1 . Check the range decoder against Table 1 0 .3-16.
Table 1 0.3-1 6. Range Decoder Truth Table
U300 Pin
Slope Range Transition Time
-
1
5.5 ns
99.9 ns
-
2
50 ns
999 ns
-
3
0.5µs
9.9 µs
-
5µs
99.9 µs
4
-
5
50 µs
999 µs
ms -
0.5
6
9.99
ms -
50
99.9 ms
7
Area
Only
in Self-Test
LEE and TRE must be in the same range. See transition modes
operating section)
2. Should values of LEE and TRE be selected that overlay in an
overlap region, the microprocessor selects the nearer range.
Example. If LEE and TRE are changed from 100 ns to 750ns, Range
2 will be selected and if they are changed from 100 µs to 750 ns,
Range 3 will be selected.
5
6
2
Ext
Ext
R2
L
H
H
H
L
H
H
L
L
H
L
L
L
H
L
ms
H
L
L
H
L
L
U301/ K300 Q311 Q312 Q313 Q314 Q315 U301/
10
9
1 2
15
16
R5
R3
R4
R6
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
L
H
L
L
L
H
L
L
L
L
19
/
F
S
L
L
L
L
L
L
L
13
H
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