3 Short-Range Comms & IoT Mode
3.3 LoRa (CSS) Demodulation Measurement
Couplings The marker specified by this command will be set as the selected marker
Preset
OFF
State Saved The marker control mode (Normal, Delta, Fixed, Off) and X Axis value are saved in instrument state
Range Normal|Delta|Fixed|Off
Annunciation Annunciation in the marker result block in the upper-right corner of the display indicates the X Axis
value and Y-axis result of the marker
More Information
Value Example Notes
Normal
CALC:MARK2:MODE POS
In Normal Mode, the trace data value (Y value) is reported at a particular point
on a trace. The marker's absolute X (and Z) position is specified by you in
displayed units. The marker symbol appears on the trace at the specified
position and tracks the absolute Y value at that position as it changes from
scan to scan. The absolute Y value is displayed in the marker readout area
Delta
:CALC:MARK2:MODE
DELT
In Delta Mode, the difference between Y values at two points is reported. A
delta marker is relative to an associated reference marker on the same trace.
(The reference marker can be set on the Marker, Properties, Relative To
menu). The reference marker is usually fixed, but can also be normal or delta.
The X (and Z) position of a delta marker is specified as an offset from the
reference marker position. The delta marker symbol tracks the absolute Y
value just like a normal marker, but the marker readout displays the difference
between the absolute Y values of the delta marker and its reference marker
(absolute units are used even if the reference is itself a delta marker). Usually
this is a straight difference in the current displayed units. For example, if the
trace format is LogMag (dBm), the delta marker displays the difference in dB,
thus showing a power ratio. But if the trace format is Real, then the delta
marker shows a voltage difference, not a ratio. Exceptions for this are:
When the trace format is Linear Mag or Log Mag (linear unit) the delta marker
displays a voltage ratio or (if the Y Axis unit is Power) a power ratio, rather than
a difference
When either the marker or its reference has a marker function turned on, the
delta marker always displays a ratio or its decibel equivalent. See Mark
Function for more details on how delta markers work with marker functions.
The type of ratio calculated (power or voltage) depends on the delta marker
units; the reference marker value is converted as needed so it has compatible
units
When the trace format is Wrap Phase, the delta marker readout is constrained
to the wrapped phase display range, which is usually (-180, +180] degrees.
For example, if the absolute phase at marker 1 is 170 deg and its reference
has phase of -170 deg, the delta does not show 340 deg, but -20 deg. Note
that the Wrap Phase display range can be changed
There is no current support for calculating deltas across traces (and this
cannot be done at all unless the traces have the same domain and ranges)
388 Short Range Comms & IoT Mode User's &Programmer's Reference
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