SWITCHED FILTER

CALIBRATION

SHAPER CALIBRATION

Shaper

Amplifier

Saturation

Waveform

 

Shaper

 

Amplifier

0.3 dB

Out of

Sauration

Final

Waveform

After

Adjustment

Figure 4-4.Limiter DAC Adjustment

Waveforms

Shaper DAC

Adjustment

NOTE

The 10 dB attenuator between the 682XXB/683XXB RF OUTPUT con- nector and the RF Detector may not be required for frequencies >20 GHz.

2.Adjust the Switched Filter Limiter DAC for each of the frequency bands as follows:

a.At the $ prompt on the PC display, type: calterm 145 and press <ENTER>.

b.On the 562 Network Analyzer, set the Resolu- tion to 0.2 dB and adjust the offset to center the top of the triangle waveform on the display.

c.Observe the displayed waveform to determine whether the Shaper Amplifier is being driven to saturation. This is indicated by a dip in the top of the triangle waveform (Figure 4-4).

If the displayed waveform indicates there is no saturation, proceed to step e. If there is a dip in the waveform, go to step d.

d.On the computer keyboard, use 8, 9, or 0 to decrement the value of the DAC’s setting until the top of the triangle waveform starts to be- come rounded (Shaper Amplifier is no longer being driven to saturation). Continue decre- menting until the top of the waveform is 0.3 dB below this point.

e.Press Q on the keyboard to go to the next fre- quency band.

f.Repeat steps b thru e until the DAC has been checked and adjusted for all frequency bands.

g.Press Q on the keyboard to exit the program. (The $ prompt will appear on the screen.)

h.Record step completion on the Test Record.

For Models 682XXB with Firmware Versions

1.01to 2.37; Models 683XXB with Firmware Versions 1.01 to 2.44; Models 682X5B with Firmware Versions 1.00 to 1.26; and Models 683X5B with Firmware Versions 1.00 to 1.30.

The following steps in the procedure lets you adjust the Switched Filter Shaper DAC which controls the gain of the Switched Filter Shaper Amplifier. Each frequency band will be scanned for the minimum unleveled power point before adjustment of the shaper DAC.

1.Set up the 562 Network Analyzer as follows:

a.Press the System Menu key.

b.From the System Menu display, select RESET.

682XXB/683XXB MM

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Anritsu 683XXB, 682XXB manual Shaper DAC Adjustment

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.

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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.

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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.