R&S
®
ZVA / R&S
®
ZVB / R&S
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ZVT GUI Reference
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Operating Manual 1145.1084.12 – 30 555
frequency stimulus signal. An additional Local Oscillator (LO) signal from PORT 4 of the analyzer
is used for down-conversion of the reference and measurement channels. A power divider feeds
the LO signal to both the left and the right converter. This test setup ensures a stable phase
relationship between both LO signals.
The analyzer measures the a-waves from REF OUT and the b-waves from MEAS OUT on the
converters. The RF connectors REF OUT, MEAS OUT on the rear panel of the diplexers are not
used. This measurement mode is analogous to the frequency converter mode described in the
Converter Control section.
The analyzer automatically switches between low frequency and high frequency mode, depending on the
stimulus frequency.
A measurement using the external test sets involves the following stages:
1. Activation of the ZVA110-BU mode for measurements with external test set
2. Entry of power coefficients (when an external test set is used for the first time)
3. Connection of the external test sets
4. Power and frequency settings
5. Power calibration using an appropriate external power meter
6. System error correction (calibration) using a suitable calibration kit
7. Connection of the DUT and measurement
Activating the ZVA110-BU Mode
After a factory preset, the R&S ZVA67 is configured for measurements using the internal test sets. You
have to activate the ZVA110-BU mode explicitly before you connect the external test sets.
To (re-)activate the ZVA110-BU mode,
1. Click System – System Config ... and open the Frequency Converter tab of the System Configuration
dialog.
2. Select Type: ZVA110-BU.
3. Click Apply to activate the mode.
4. If you use your vector network analyzer for the first time, click Power Coefficients to enter the power
coefficients. Refer to the Getting Started guide for details.
5. Close the System Configuration dialog.
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