B+K precision RFM3000 Series, User Manual, Page: 31 / 58

Operation 31
4.3.6 Channel Settings
To enter the Channel menu press the icon then select the Channel > Channel # menu.
Chan Enabled
Toggle the display of the trace and measurements for the selected channel. The chan-
nel may still be used as a trigger source when set to Off.
Vert Scale
Set the power or voltage vertical axis level for the trace display based on the untis as
shown in table 4.8
Units Scale
dBm 0.1, 0.2, 0.5 1, 2, 5, 10, 20, 50 dB/div
Watts 1 pW to 500 MW/div in a 1-2-5 progression
Volts 1 µV to 100 kV/ div in a 1-2-5 progression
Table 4.1 Vertical Scale Range
Vert Center
Set the power or voltage, horizontal centerline, level of the graph for the specified
channel in the selected channel untis.
Figure 4.8
Channel Setttings
Averaging
Only available in Pulse and Statistical modes. Set the number of traces averaged to-
gether to form the measurement result on the selected channel. Averaging can be used
to reduce display noise on both the visible trace, marker, and automatic pulse measure-
ments.
Trace averaging is a continuous process in which the measurement points from each
sweep are weighted (multiplied) by an appropriate factor and averaged into the existing
trace data points.
The most recent data will always have the greatest effect on the trace waveform, and
older measurements will be decayed at a rate determined by the averaging setting and
trigger rate. This averaging technique is often referred to as “exponential” averaging
because averaging imposes a first-order Infinite Impulse Response (IIR) exponential
filter with a time constant of "n" where n is the Average (number of averages) setting.
Figure 4.9
Channel Setttings
Note:
For timebase settings of 200 ns/div and faster, the RFP3000 Series sensors acquire samples using a technique called
equivalent time or random interleaved sampling (RIS). In this mode, not every pixel on the trace gets updated on
each sweep, and the total number of sweeps needed to satisfy the average setting will be increased by the sample in-
terleave ratio of that particular timebase. At all times the average trace is the average of all samples for each pixel,
and the min/max are the lowest and highest of that same block of samples for each pixel.