TROUBLESHOOTING

TROUBLESHOOTING

TABLES

Table 5-4.Malfunctions Not Displaying an Error Message (3 of 6)

No Pulse Modulation of the RF Output

Description: The signal generator does not display any error messages during self-test; however, there is no pulse modulation of the RF out- put.

Step 1. Set up the 682XXB/683XXB as follows:

a.Press SYSTEM, then Reset.

b.Press MODULATION, then Pulse to go to the Internal Pulse Modulation Status display.

c.Press On/Off to turn on pulse modulation.

Step 2. Using an oscilloscope, verify the presence of a TTL pulse (with a pulse width of approximately 25 ns) at the rear panel PULSE SYNC OUT connector.

qIf present, go to step 5.

If not present, go to step 3.

Step 3. Disconnect the cable, W129, from A6J4.

Step 4. Using an oscilloscope, verify the presence of the Pulse Sync signal at A6J4.

qIf present, replace the cable W129. If not present, replace the A6 PCB.

Step 5. Using a coaxial cable with BNC connectors, connect the rear panel PULSE SYNC OUT connector to the External Trigger Input on an oscilloscope and select External Trigger.

Step 6. Disconnect the cable, W122, from A6J6 and the cable, W123, from A6J7.

Step 7. Using the oscilloscope, verify the presence of (1) a pulse train at A6J7 (pulse signal to the Switched Filter) with an output level of +2 volts to –2 volts, a pulse period of 1 ms, and a pulse width of 200 ￿s; and (2) a pulse train at A6J6 (sample and hold signal to the A10 ALC PCB) with an output level of 0 volts to +1 volt, a pulse period of 1 ms, and a pulse width of 200 ￿s.

Note that on an expanded timebase, the signal at A6J6 starts approximately 50 ns before the signal at A6J7.

5-14

682XXB/683XXB MM

Page 179 Page 181
Page 180
Image 180
Anritsu 682XXB, 683XXB manual No Pulse Modulation of the RF Output
Page 179 Page 181

682XXB, 683XXB specifications

The Anritsu 683XXB and 682XXB series are advanced vector network analyzers (VNAs) renowned for their precision and versatility in characterizing RF and microwave components. Designed for engineers and technicians involved in the development, manufacturing, and testing of high-frequency devices, these analyzers offer state-of-the-art technology that ensures optimal performance in various applications.

One of the hallmark features of the Anritsu 683XXB and 682XXB is their high dynamic range, which allows for accurate measurements of small reflection and transmission coefficients, essential for assessing the performance of complex RF structures. With frequency coverage extending from DC to 70 GHz, these analyzers cater to a broad spectrum of applications, making them suitable for industries such as telecommunications, aerospace, and automotive.

The user-friendly interface of the Anritsu VNAs is complemented by a high-resolution display, which facilitates easy navigation through measurement setups and results. The analyzers feature multiple measurement modes, including S-parameter measurements, time-domain analysis, and noise figure measurements, providing engineers with comprehensive tools for device characterization.

Both the 683XXB and 682XXB implement advanced calibration techniques, including automated calibration and error correction methods, to enhance measurement accuracy. These methods significantly reduce the uncertainties associated with test setups, enabling reliable performance evaluations of components like filters, amplifiers, and antennas.

Anritsu’s proprietary technologies, such as the VectorStar and ShockLine series integration, further empower the 683XXB and 682XXB models. These technologies enable high-throughput testing and improved measurement stability, addressing the needs of modern production environments that demand rapid turnaround times without sacrificing precision.

Additionally, the analyzers come equipped with various connectivity options, including USB, LAN, and GPIB, ensuring seamless integration into automated test systems. This adaptability enhances the analyzers' utility in both laboratory settings and field operations.

In conclusion, the Anritsu 683XXB and 682XXB series vector network analyzers represent the pinnacle of RF and microwave testing technology. With their unmatched precision, comprehensive measurement capabilities, and advanced calibration techniques, these instruments are indispensable tools for professionals striving to push the boundaries of high-frequency device performance and reliability.
Top Page Image Contents