Last updated: 2014-11-28
Frequency Stability Measurement Description
Frequency Stability Measurement Parameters
Frequency Stability Measurement Results
The Frequency Stability measurement displays the frequency of an RF signal applied to the test set's front panel RF IN/OUT input port. After each measurement the input signal's absolute RF frequency is displayed with 1000 Hz resolution on the test set's front panel and 1 Hz resolution when queried over the GPIB.
The absolute RF signal frequency obtained during each Frequency Stability measurement is compared to the expected (measurement downconverter) frequency of the test set's measuring receiver. The difference between the expected frequency and the measured frequency is displayed as frequency error with 1 Hz resolution.
If the device under test is a mobile station on a call, the expected frequency can be automatically set by the base station emulator (using the Channel setting).
If the device under test is not on a call, the expected frequency must be set by manually controlling the receiver (manual measurement frequency).
When multi-measurement count is turned on during a Frequency Stability measurement, the test set returns statistical data acquired over a number of measurements, including the worst case frequency error, in ppm (parts per million).
Multi-Measurement Count: see Multi-Measurement Count
Additional Filter: indicates whether to use a bandwidth 30kHz filter or not.
Trigger Arm: see Trigger_Arm
Measurement Timeout: see Measurement Timeout
Frequency Error: The absolute RF signal frequency obtained during each Frequency Stability measurement is compared to the expected (measurement downconverter) frequency of the test set's measuring receiver. The difference between the expected frequency and the measured frequency is displayed as frequency error with 1k Hz resolution.
Within the frequency interval 293 MHz to 2.7 GHz.
Within 200 kHz of the expected frequency.
Greater than -30 dBm.
Within 3 dB of the expected power.
Within an FM index of three (if FM is applied).
Within 100 Hz and 15 kHz modulating frequency (if FM is applied).
GPIB Commands: SETup:FSTability, FETCh:FSTability