Hi,
i'm measuring the attenuation of a variable attenuator (ZX73-2500-S+). With supply voltage, control voltage and input power fixed and the frequency varied around 3GHz, i've measured the plot below.
Is that expected when not changing the frequency setting of the E4419B?
If so, what does this setting do?
My setup:
+-------------+ +------------+ +--------------+
| R&S SMC | | +------------------------>+ChA |
| RF power-src+--->+ Splitter | | E4419B |
| | | +-------+ +------>+ChB |
+-------------+ +------------+ | | +--------------+
v |
+---------------+
| |
| Attenuator |
| |
+---------------+
Many thanks!