HP 8112A Operating, Programming And Servicing Manual page 160

Note
9-B Adjustment Procedures
9. Centre the pulse base line vertically (offset = 8 V) and set
10. Set the VARIABLE LEVELS = -5 to +53
1 1 . Check overshoot < 53 in normal and complement modes.
Re-adjust A1 C530 if necessary.
12. Set the HP 81 12A as follows:
Transition Fixed
Overshoot
t0%
0%
---,
13. Repeat steps 7 to 1 1 using 90 - 1 103 / - 10 - 103 and adjust
A1C410 for overshoot < 103 in both normal and complement
modes.
14. Set the HP 8 1 1 2A as follows:
LOL - 2.0
LIMIT Off
15. Check the overshoot at both HIL and LOL for both Fixed and
Linear modes. If necessary, re-adjust A1 C530 or A1C410 to
achieve the above limits. Repeat steps 1 to 12 if necessary.
The oscilloscope trace :flatness error ( GaAs input circuit ) may affect
measurement of pre- and over-shoot
16. Set the HP 81 12A as follows:
Transition Fixed
HIL
+0.5
LOL -0.5
LIMIT Off
17. Remove one of the two 20 dB attenuators and set attenuation
factor to 10.
__ __ _ ,
Pulse Width
50%
Amplitude
Pre-shoo t
LOL
Figure 9-3. Typical Pulse Display
v
v
v
50%