Agilent Technologies e4418b, e4419b manual End

Troubleshooting

Introduction

A

Select

Preset/local

Confirm

Meas/Setup

Limits

Limits On

TTL Output

TTL Output On, Fail O/P Low

DVM reading

Yes 5.0V+/-0.5V?

Select

Fail O/P High

No

Power down meter.

Disconnect ac power and battery if fitted. Remove A2 Processor assy, as directed on page 5-9, to access the Comms Assembly connector. Use DVM to check resistance between J4 pin 41 and Rmt I/O connector pin 3.

DVM reading

Yes 0.0V+/-0.5V?

No Fault found with Upper Window TTL Over Limit detection circuit - check user application/implementation

No

A2 Processor Assy

Defective

Yes		DVM reading		No
		Ω	+/- 10%
	450

A4 Comms Assy

Defective

End

6-4 Agilent E4418B/E4419B Service Guide