Chapter 2 123
Front-Panel Key Reference
Meas Setup
Key Access: Meas Setup
AC
Sets the input coupling to ac coupling. Measurements
below 100 kHz (10 MHz for E7405A) will have
significant amplitude errors in the ac coupled mode.
You should use the dc coupled mode to avoid this rolloff
effect.
Key Access:
Meas Setup, 9 - 150 kHz
DC
Sets the input coupling to dc coupling. This allows you
to make measurements at low frequencies with
increased accuracy.
CAUTION To prevent damage to the input circuitry of the analyzer, please ensure
that dc and transient signals are suppressed before selecting dc coupled
mode. Select ac mode if you are unsure of the nature of the input signal.
Once dc coupling has been selected, the analyzer
remains in the dc coupled mode until you do one of the
following:
1. Press
Preselect.
2. Press
Input/output, Coupling (AC).
3. Press
Meas Setup and then select one of the band
keys that automatically set the coupling mode to ac
or manually set the coupling to ac under one of the
band keys that allow ac and dc coupling.
4. Execute a SCPI remote commands that is the
equivalent to one of the items 1 through 3.
Key Access:
Meas Setup, 9 - 150 kHz
150 kHz - 30 MHz
Sets CISPR BAND B start frequency to 150 kHz and the stop to
30 MHz. The reference level is set to 75 dBuV in log scaling and the
units to dBuV. The resolution bandwidth is set to 9 kHz (Man Couple),
the marker is turned on as the active function, and the following
settings are set to Auto: video bandwidth, video bandwidth ratio, sweep
time, attenuation, and center frequency step size. Start Frequency is
made the frequency default.
Detector Peak
Scale Type Log
Scale/Division 10 dB/Div
Marker 1 Normal, active
Description Setup
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