Troubleshooting DC-To-DC Converter

Parallel NOR gates A4U1, A4U2 and A4U3A act as drivers and switch on FETs A4Q1, Q2, Q3 and Q4 through pulse transformer A4T1. NOR gate A4U3B turns off the FETs through pulse transformer A4T2 and transistors A4Q5 and A4Q6.

Circuits Included. On-Pulse Driver, Off-Pulse Driver, FET Switches and Drivers on A4 FET board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the external supply to 40Vdc. Set the unit's output voltage to 20Vdc and current to above 1Adc using "DISPLAY SETTINGS" switch. Verify that the UNREGULATED LED lights. See Figure 3-3 for waveforms.

Inputs:

 

 

 

NODE ( + )

NODE ( - )

MEASUREMENT

SOURCE

A2J7-26

M

1.7∝s 20KHz pulse

A2J5-11, A2U15-1, A4P1-A3

(PWM-ON)

 

(see Waveform 1)

 

A2J7-25

M

10∝s 20KHz pulse

A2U16-5, A2J5-13, A4P1-A2

(PWM-OFF)

 

(see Waveform 2)

 

A4P1-C1

M

10.6Vdc

A1U3-2

A4Q2-D

A4Q4-S

39Vdc

A1C5 (+), A4P1-22 to 25

 

 

 

A1C1(-), A4P1-16 to 18

Outputs:

 

 

 

NODE ( + )

NODE ( - )

MEASUREMENT

 

A4Q1/Q2-G

A4Q2-S

(see Waveform 3)

 

A4Q3/Q4-G

A4Q4-S

(see Waveform 3)

 

A4Q2-S

A4Q4-D

(see Waveform 4)

 

A2J7-18

A2J7-4

(see Waveform 5)

 

If you replace the FETs, replace both the FETs and associated drive components as furnished in FET Service Kit, Agilent Part No. 5060-2866.

The FETs are static sensitive and can be destroyed by relatively low levels of electrostatic voltage. Handle the A4 FET board and the FETs only after you, your work surface and your equipment are properly grounded with appropriate resistive grounding straps. Avoid touching the FET's gate and source pins.

Troubleshooting Down Programmer

The down programmer discharges the output when either PWM OFF is generated or CV ERROR is more negative than about - 3Vdc. Comparator A5U1 triggers down programming when the voltage at A5U1-5 is less than about 4Vdc.

Circuit Included. Down programmer and 10.6V bias supply on A1 main board.

Setup. The Main Troubleshooting Setup, page 33, except connect the external supply to the unit's + OUT ( + ) and – OUT ( - ) terminals. Apply the ac mains voltage to the isolation transformer. Set the external supply for an output voltage of 10Vdc and set current limit for 2.5 Amps. Set the power supply under test for a voltage setting of 8.0Vdc and current setting of 2.0Adc using "DISPLAY SETTINGS".

42

Page 41 Page 43
Page 42
Image 42
Agilent Technologies 6012B, 6010a Troubleshooting DC-To-DC Converter, Troubleshooting Down Programmer, Pwm-On, Pwm-Off
Page 41 Page 43

6015A, 6012B, 6011A, 6010a specifications

Agilent Technologies, a leader in the field of measurement and analysis, offers a suite of instruments within its 6010 and 6011 series, specifically the 6010A, 6011A, 6012B, and 6015A models. These devices are designed to meet the needs of various industries, including healthcare, environmental monitoring, and materials testing.

The Agilent 6010A is a high-performance spectrometer known for its precision and versatility. It utilizes advanced optical technologies to provide exceptional wavelength accuracy and resolution. This model is particularly useful in laboratories where reliable data is critical, offering a wide spectral range and effective noise reduction features. Its user-friendly interface simplifies complex analyses, making it suitable for both seasoned professionals and newcomers.

Following closely, the Agilent 6011A is recognized for its robust capabilities in laboratory environments. This device incorporates advanced signal processing techniques, enabling high-throughput measurements without compromising on quality. The 6011A is ideal for real-time monitoring applications, ensuring that users can make informed decisions based on accurate, timely data. Its comprehensive software suite is designed to enhance data analysis, allowing for seamless integration with existing laboratory workflows.

The 6012B variant enhances the functionality further by introducing additional features tailored for specific applications. With a focus on flexibility, the 6012B supports multiple measurement modes, including direct and differential detection. This model excels in complex measurements, allowing for greater analytical depth and insights. The built-in calibration options ensure consistent performance, making it a reliable choice for various research and development tasks.

Lastly, the Agilent 6015A model stands out with its leading-edge technology, designed for the most demanding applications. It boasts enhanced sensitivity and an improved dynamic range, making it perfect for trace analysis in challenging environmental samples. The 6015A’s advanced reporting tools provide detailed analytics, helping scientists and researchers interpret results efficiently. Its compact design also makes it suitable for laboratory spaces with limited room, without sacrificing performance.

Together, these models showcase Agilent Technologies' commitment to delivering high-quality, innovative solutions that empower users to achieve their analytical goals effectively and efficiently. Whether in a research, clinical, or industrial setting, the 6010A, 6011A, 6012B, and 6015A continue to set standards in precision instrumentation.
Top Page Image Contents