Rohde & Schwarz NAPZ6 RF Power Sensor – Tested Used

Description

Additional Features:

• Power Measurement range: 0.3 W to 1100 W
• Frequency range: 25 MHz to 1 GHz
• SWR (referenced to 50Ω): 1.07 max
• Insertion Loss up to 0.3 GHz: 0.05 dB max
• Insertion Loss up to 0.5 GHz: 0.10 dB max
• Insertion Loss whole frequency range: 0.15 dB max
• Directivity: 25 dB min
• Measurement uncertainty at 20°C to 25°C: 6% max of reading, plus zero offset
• Zero offset: ±0.04 W
• Temperature coefficient: 0.25%/K max, to be considered outside temperature range 20°C to 25°C
• Measurement time: 0.4 s
• Measurement range Return loss/SWR/reflection coefficient: 0 dB to 23 dB/1.15 to ∞/0.07 to 1 (30 MHz to 1 GHz)
• Minimum forward power: 3 W

The Rohde and Schwarz NAP-Z6 is a Directional Power Sensor for the NAP and NRT Power Reflection Meters. These sensors can be operated via the option NRT-B1 on the NRT base unit and allow average power and matching to be measured. As with the NRT sensors, directional couplers with high directivity and rectifying diodes exclusively operating in the square range allow high measurement accuracy independent of the signal waveform.

The two main parameters for specifying the accuracy of a directional power meter are the power measurement uncertainty with matched load and the directivity. The directivity is a measure of the selectivity of the directional coupler between forward and reflected wave and influences the accuracy both of the reflection and the power measurement.

Directivity defines the absolute maximum for the measurable return loss. The return loss of a load featuring good matching can only be measured with low measurement uncertainty if the directivity is sufficiently high, as for example with the Directional Power Sensors NRT-Z and NAP-Z.

High directivity is also required for accurate power measurements on mismatched loads. The use of low-cost instruments may lead to considerable measurement uncertainty, with too high or too low values being indicated depending on the phase of the load reflection coefficient.

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