Output Held Low Troubleshooting (sheet 2)

AFrom Sheet 1

No

A1D413 Conducting

?

Yes

Check voltage at A1U408-3 and R686 (TP36) to common (TP9).

 

 

 

Check IMon voltage at A1U403-7

Yes

 

 

 

 

(TP28) to common (TP9).

 

 

 

 

 

 

 

 

 

 

 

 

 

A1D413 Conducting

 

 

 

CC Comparator A1U403 defective.

 

Yes

 

 

?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IMon Amp A1U403 defective.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A1U408-3 Neg

 

 

 

 

 

 

Gross Current Limit circuit A12U409

 

Yes

 

 

 

 

 

defective.

?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A1R638 > 12mV

 

 

 

 

 

 

Check A1U408, D420, loading of

 

 

No

 

 

 

 

 

 

 

voltage by Tunnel Circuits.

?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

Check if supply operates OK with no load but cannot get full scale output with load connected.

Disconnect cables from tunnel boards A4A1-A4A4 one at a time to see if output rises.

Output Rises

 

 

 

Troubleshoot or replace defective

 

Yes

 

 

 

tunnel board.

?

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check A1U408 and D420

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Disconnect cables from Tunnel

Partial output attained

 

 

 

 

boards one at a time to see if one has

 

Yes

 

 

 

 

 

little or no effect. Troubleshoot or

?

 

 

 

 

 

 

 

 

replace the defective board.

 

 

 

 

 

 

 

 

 

 

 

 

 

No

Check Gated +9V and Shutdown circuit. See Test Points 18-21, Table 6-3 and Figure 6-5 Sheet 2.

Figure 3-8 Output Held Low Troubleshooting (Sheet 2 of 2)

18

Service Addendum

Page 18
Image 18
Agilent Technologies E4351B, E4350B service manual Output Held Low Troubleshooting Sheet 2

E4351B, E4350B specifications

Agilent Technologies, a leader in electronic measurement, offers a range of advanced solutions, including the E4350B and E4351B switching systems. These models are specifically designed to meet the increasing demands of modern testing environments, providing high reliability and precision for a variety of applications.

The Agilent E4350B is known for its low resistance switching capabilities, making it an ideal choice for applications requiring accurate and repeatable measurements. It supports up to 16 channels of low resistance testing, allowing engineers to simulate complex electrical paths and identify potential issues in circuit designs. With an optional temperature measurement capability, users can monitor the thermal performance of components directly during tests.

On the other hand, the E4351B model enhances flexibility with a modular design, offering an extensive range of input and output configurations. This instrument is particularly well-suited for automated test systems, providing the ability to connect multiple devices and manage them seamlessly. Its high-speed switching technology enables quick toggling between channels, ensuring that large datasets can be acquired swiftly without compromising accuracy.

Both models employ advanced contact technology, which minimizes the potential for signal degradation, ensuring that users receive reliable data with minimal noise interference. This feature is crucial in applications where signal integrity is paramount, such as in research and development or quality assurance processes.

Enhanced user interfaces simplify operations for both novice and experienced technicians. The built-in touchscreen and intuitive navigation allow for easy setup and operation, significantly reducing the learning curve. Furthermore, the comprehensive software support provided by Agilent facilitates integration with various programming environments, allowing for custom test sequences tailored to specific needs.

Moreover, both E4350B and E4351B systems are built with durability in mind. The robust construction ensures long-term reliability, reducing downtime and maintenance costs. This makes them ideal candidates for both laboratory settings and field operations where consistent performance is critical.

In summary, Agilent Technologies’ E4350B and E4351B models are distinguished by their precision, flexibility, and robust performance. Their advanced features and user-friendly design make them suitable for a wide variety of applications, from routine testing to complex R&D projects. By leveraging modern switching technologies, these systems set a high standard for electronic measurement, aiding engineers in developing reliable electronic solutions.