Timing Ranges
Measure levels at U2 Timing Range Decoder IC against readings in
Table 10.5-2
Table 1 0.5-2. Timing range decoder
Timing Range Decoder U2
Period range 1 PER 20 ns-99.9 ns
all other ranges PER 100 ns-950 ms
Double range
1
DBL 20 ns-99.9 ns
all other ranges DBL 100 ns-950 ms
Width range 1 WID 20 ns-99.9 ns
all other ranges WID 100 ns-950 ms
Slope range
1
LEE=TRE 5.5 ns-99.9 ns
Slope range 2
LEE=TRE 50 ns-999 ns
Slope range 3
LEE=TRE 0.5 µs-9.99 µs
Slope range 4
LEE=TRE 5 µs-99.9 µs
Slope range 5
LEE=TRE 50 µs-999 µs
Slope range 6
LEE=TRE 0.5 ms-9.99 ms
Slope range 7
LEE=TRE 5 ms-99.9 ms
Area
Period Control
l .
Set the HP 81 12A to RCL
O
Pin 2 Pin 5 Pin 6
PRO DRO WRO
L
H
L
H
L
H
U3/3 U28/4 U3/4
Pin 12 Pin15
SCPO SC Pl
L
L
H
L
H
L
H
L
H
L
L
H
H
H
U l l/10 U l l/9
2. Check the Period DAC output according to the following table:
Table 1 0.5-3. Typical Period Control DAC Output
HP 8112A PER Voltage at TPl
1 ms
+9.8 v
5 ms
+l.95 v
9.99 ms
+0.98 v
Delay Control
l .
Set the HP 81 12A to RCL 0, PER 15 ms
2. Check the Delay DAC output according to the following table:
Table 1 0.5-4. Typical Delay Control DAC Output
HP 8112A DEL Voltage at TP3
1 ms
5 ms
9.99 ms
+9.8 v
+l .95 v
+0.98 v
Servicing the Control Board 1 0.5-13
Summary of Contents for 8112A
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Page 295: ...MP MP3 MP MP2 MP4 MPS MP 1 2 MPS MP MP I B ElElElEl Replaceable Parts A 3 ...
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