Making The Carrier Frequency Drift Measurement; Purpose; Measurement Method; Making The Measurement - Agilent Technologies ESA-E Series Measurement Manual

Making Bluetooth™ Measurements

Making the Carrier Frequency Drift Measurement

Making the Carrier Frequency Drift Measurement

Purpose

The carrier frequency drift measurement checks the performance of the modulator
circuitry and the stability of the Voltage Controlled Oscillator (VCO).

Measurement Method

To make the measurement a demodulated signal is used with the payload data
consisting of a repeating 4-bit 1010 sequence. The absolute frequencies of the 4
preamble bits are measured and integrated, providing the initial carrier frequency.
The absolute frequencies of each successive 10-bit pattern in the payload are then
measured and integrated.
The frequency drift is the maximum difference between the average frequency of
the 4 preamble bits and the average frequency of any 10 bits in the payload field.
The maximum drift rate applies to the difference between any two 10-bit groups
separated by 50 µs within the payload field.

Making the Measurement

1. Press the
2. Press the
The factory default settings provide a Bluetooth™ compliant measurement. For
NOTE
special requirements, you may need to change some of the settings. Any changes
from the default values may result in invalid measurement data.
Press
parameters for the current measurement to their default settings.
• Mode setup and frequency/channel parameters.
20
Measure key.
Carrier Freq Drift
Meas Setup , More (1 of 2)
Use the and
Mode Setup
parameters for all measurements made within the current mode. For further
information, refer to Chapter 1 of this document.
key.
, Restore Meas Defaults
keys to change these
Frequency Channel
at any time to return all
Chapter 3