Width Generator; Check For The Supply Voltages; Check The Current Sources For The Width Generator; Edge Interface - HP 8114A Service Manual

HP 8114A Service Guide

Width Generator

Edge Interface

5-14 Troubleshooting
2. Check for the following voltage drops across R502:

Check for the supply voltages:

Check the current sources for the width generator:

1. Varying the width from 10.0 ns to 99.9 ns the voltage at pin 7 of
2. Check for the following voltage drops across R602:
1. Set standard setting, by pressing ISHIFT), (STORE) (Recall), (TJ.
2. Check at U702 pin 13 for an ECL signal (high level at -0.8 V, low
level at -1.8 V) with 15 96 duty cycle.
5-7. Voltage at Pin 8 of U504C
- 5 . 0 7 v
100 ns
-467
999 ns
2 3 4
100 ns
999 ns 21 mV