HP 8112A Operating, Programming And Servicing Manual page 219

- 0 . ? V
- 1 . 6 V
Figure 1 0.3-9. Period Generator ramp signal pin 20
3. Check the trigger output signal at pin 2 1 of U200 against
Figure 10.3- 10.
4. Check the signal being sent to the delay generator IC220 at TPl
against Figure 10.3-10.
�
0
OUTPUT � P l � l
OUTPUT TO DELAY
GENERATOR ON TP I
-ZV
Figure 1 0.3-1 O. Period Generator output signals
5. Check the period generator operation against Table 10.3- 10 and
Table 10.3- 1 1 :
Table 1 0.3-1 0. Period Generator Operation
U200 Pin Mnemonic
PERC
5
ERP
2
PIC
10
1 1 to 18 LD7 - LDO Data to be latched into
R212 PVC
6. Verify that voltage at U200 pins 1, 4 and 5 are at virtual ground
(
min. -40 m V max. 0 V
� �
7 0 n s
�1�--- - �--�•1
l ms
50% 5 0%
---•I
l ms
Description
Period control voltage input
Period error output signal
Period input store select
the input store of
U200
Period vernier current
)
Servicing the Timing and 1 0.3- 1 7
Slope Generators
State
L
L
See Table
10.3- 1
See Table
10.3-2
See Table 1 0.3- 1 1