Operation
33
Peak Hold
Set the operating mode of the selected channel’s peak hold function.
When set to OFF, peak values are not held.
When set to instantaneous (INST) instantaneous peak readings are held until reset by a new acquisition or cleared
manually. This setting is used when it is desirable to hold the highest peak over a long measurement interval without
any decay.
When set to average (AVG) peak readings are held for a short time, and then decayed towards the average power at a rate
proportional to the Averaging setting. This is the best setting for most signals, because the peak will always represent
the peak power of the current signal, and the resulting peak-to-average ratio will be correct shortly after any signal level
changes.
dB Offset
Sets a measurement offset in dB for the selected channel. This is used to compen-
sate for external couplers, attenuators, or amplifiers in the RF signal path ahead of the
power sensor.
Zero
Performs a zero offset null adjustment. The sensor does not need to be connected to
any calibrator for zeroing. This action removes the effect of small, residual power off-
sets, and should be performed prior to low-level measurements. The procedure is often
performed in-system. There should be no RF signal applied to the sensor input prior to
zeroing.
Figure 4.12
Channel Setttings
Fixed Cal
Performs a single point sensor gain calibration of the selected channel at 0 dBm and the current frequency setting. This
requires a calibrated 0 dBm (1.00 mW) signal source at the current measurement frequency. This procedure calibrates
the sensor’s gain at a single point. At other levels, that gain setting is combined with stored linearity factors to compute
the actual power.
The built-in test source of the RFM3000 is not a sufficiently calibrated source for performing
a fixed calibration. An external calibration source is required. Note that fixed calibration is
NOT REQUIRED for USB power sensors.
Summary of Contents for RFM3000 Series
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