Viavi CX300 ComXpert, Operation Manual

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Chapter 5 Test and Measurement Functions
CX300 Meters
22130634 CX300 ComXpert Operation Manual Rev. 001
5.6.6 RF Power Measurements
The RF Power meter is used to evaluate the RF transmit performance of a UUT, most
commonly to determine if the UUT’s output power is meeting specification.
The RF Power meter supports limits which are described in
section 5.6.1, on page 5-27,
user-configurable meter scales which are described in section 5.6.2, on page 5-31 , and
average measurements which are described in section 5.6.3, on page 5-31 .
The RF Power meter also contains the following controls and settings:
5.6.7 Transmitter Frequency Measurements
The CX300 provides users with the ability to choose between either RF Error meter or RF
Counter for evaluating RF signal accuracy. The type of measurement is selected using the
Frequency Measurement toggle switch located on the RF Error meter pane.
5.6.7.1 RF Error Meter
The RF Error meter measures the frequency error of the received signal in relation to the
defined RF Receiver Frequency . RF Error controls and settings are accessed from the RF
Freq Error settings menu .
The RF Error meter supports limits which are described in section 5.6.1, on page 5-27,
user-configurable meter scales which are described in section 5.6.2, on page 5-31 , and
average measurements which are described in section 5.6.3, on page 5-31 .
• A positive error indicates that the transmitter signal’s frequency is too high.
• A negative error indicates that the transmitter signal’s frequency is too low.
Table 5-14 RF Power Meter Controls and Settings
Parameter Description
Unit
Selects the unit-of-measurement used to display the RF Power
reading.
Frequency Measurement Toggle Switch
This switch is accessed from the RF Error/RF Counter meter pane.
The Frequency Measurement toggle switch selects either the RF Error meter or
the RF Counter as the active radio frequency measurement.
When Error is selected, the measurement pane updates to display a Frequency
Over Time plot field which provides a visual representation of the measurement.