HP 8112A Operating, Programming And Servicing Manual page 237
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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Transition Mode and
Output Control Signals
Shaper IC
Amplitude-vernier
Control-voltage
Shaper IC Reference
Current
Shaper IC
Current-mirror
Pre-Attenuator and
Output Attenuator
Control Signals
Check the logic levels on shaper IC pins for each type of transition
and output mode, against Table 10.4-3 :
Table 10.4-3. Waveform Control truth table
Transition WFl
Fixed
Linear
Gauss
Output
Mode
Norml
COMPL
Check the amplitude-vernier control-voltage with the HP 8 1 12A
HI1 and 101 settings as indicated in Table 10.4-4. The voltage is
measured at the board connector side of R422.
Table 1 0.4-4. Amplitude-vernier Control-voltages
HP 8112A Setting Control voltage
+0.5 v
+2.5 v
+4.99 v -4.99 v
Shaper IC reference current (Ire f ) can be checked by measuring the
voltage across R41 1 . The reading should be approximately 5.4 V
which equates to I re f of 2.5 mA.
Check that the signal levels at the emitters of Q400A and Q400B are
identical, as these transistors are a matched pair.
Check the relay control signals KO -K4 against Table 10.4-5:
Table 1 0.4-5. Attenuator Control truth table
Amplitude range
10.0 V
1 .00 V
100 m V
Output Disabled
Servicing the Shaper and Output Amplifier 10.4-13
WF2
Pin 22 Pin 23 Pin 19
Type
H
L
L
L
H
L
x
x
x
x
-0.5 v
+5.03 v
HIL
LOL
at R422 ( typ)
-2.5 v
+2.8 v
< lO mV
KO Kl K2 K3 K4
16.0 V
H
H
-
9.99 V
L
H
-
999 m V L
L
-
H
L
/
N
C
x
x
x
L
H
H
L
L
L
H
L
H
H
L
H
H
H
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