6 Troubleshooting
122 E4416A/E4417A Power Meters Service Guide
Figure 6-5 Troubleshooting Guide - TTL Inputs
Start
Power Up
meter
POST
Pass?
Connect Sensor to Channel A
Any
Sensor
Errors?
Select
System/Inputs
More
Service
Self Test
Instrument Self Test
Self Test
Errors?
End
Yes
No
A
Select
No
Investigate Power
Meter Failure
Investigate
Sensor Failure
No
Yes
Yes
Connect Sensor to Channel B (if applicable)
Done
Zero/Cal
More
TTL Inputs On
Apply TTL logic 0 pulse to RJ45 connector pin 5
wrt pin 8. Apply TTL logic 1 pulse to RJ45 connector
pin 6 wrt pin 8. See User’s Guide Ch. 2 for timing.
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