28 | Keysight | N9038A MXE EMI Receiver Self-Guided Demonstration - Demo Guide
Appendix
Frequently asked questions
Following are answers to common questions when making compliance measurements
with the MXE.
Table 3. Troubleshooting the MXE
Question Answer
Should I use DC coupling for CISPR band A/B? It’s recommended to use DC coupling on the MXE for frequencies below 10 MHz, otherwise the noise
floor will be high and risk failing the test for CISPR band A (9 kHz to 150 kHz) and B (150 kHz to 30 MHz).
To switch RF coupling from AC to DC, push [Input/Output], {RF Input}, {RF Coupling DC}.
What do I do if an external pulse limiter is not
available for a conducted emission test?
Input 2 of the MXE is designed with a transient limiter to protect the receiver from large output pulses
generated by LISNs. Input 2 is recommended for conducted measurements.
Why is the noise floor of RF Input 2 higher than
Input 1?
This difference is due to the extra attenuation loss of the built-in pulse limiter on the path of RF Input 2.
What do I do when the message, “Align 20 Hz
to 3.6 GHz required,” appears?
The message, “Align 20 Hz to 3.6 GHz required,”is a warning message to remind you to align the
preselector. Auto alignment doesn’t cover preselector alignment, so manual alignment is required.
Perform the alignment by pushing [System], {Alignment}, {Align Now}, {RF Preselector Only (20 Hz – 3.6
GHz)}.
What do I do if I want to scan over 4,000
seconds?
On the MXE, the default scan type {Smooth} limits the maximum scan time to 4,000 seconds. The
combination setting of dwell time and step size, or scan time and scan points are subject to this
limitation. If you want to scan over this limitation, the scan type should be set to {Discrete (Stepped)} or
{Time Domain}.
What settings are reset by [Mode Preset]? [Mode Preset] aborts the currently running measurement and resets most, but not all settings in
the current mode. Select {Restore Input/Output Defaults} and {Restore Mode Defaults} to reset the
remaining settings.
The following settings are not reset by [Mode Preset]:
– All the other settings under [Input/Output] except for {RF Preselector}, and {RF Calibrator};
– {Mode IDN Response}, {Noise Reduction}, and {Global Settings} under [Mode Setup]
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