Bird Technologies BDS-Manual - Manual (Page 15)

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Chapter 1 Introduction
Bird Diagnostic System (BDS)
The Bird Diagnostic System (BDS) is a broadband (1 MHz to 500 MHz) RF monitoring and diagnostic system designed
to be used in a 50 or non-50 ohm environment. It is comprised of three components:
•
In-line RF sensor
•
A receiver that processes the real-time sensor data
•
A cable that connects the sensor to the receiver
The sensor, which consists of passive, temperature stable components, is inserted into an RF delivery system where
it couples voltage and current signals and sends that data to the receiver through the cable assembly. The receiver
converts the incoming analog signal to digital data and then processes the data and makes it available to the com-
munication port. The user’s system communicates with the receiver through the communication port.
There are two modes of operation:
•
Standard Tracking Mode
•
Spectral Search (Sweep) Mode
In both operating modes, there are two data monitoring modes:
•
Low resolution data monitoring (8 bit ADC)
•
High resolution data monitoring (12 bit ADC)
The BDS also has the capability to locate arc transients. These operating modes are explained in the following sections.
Standard Tracking Mode
In the Standard Tracking mode, the BDS collects voltage and current information for user specified fundamental fre-
quencies. Up to five fundamental frequencies can be specified to monitor. For each fundamental frequency, up to 15
harmonic frequencies can also be monitored (in addition to the fundamental) and a subset of up to 6 mixing prod-
ucts can also be monitored. The BDS reports voltage amplitude, current amplitude, and phase information as a data
set for each specified fundamental frequency.
Example - Select 2 MHz as the first fundamental frequency (F1) and 13.56 MHz as the second fundamen-
tal frequency (F2), and specify two harmonics for F1 (H1 and H2) and one harmonic for F2 (H1), the results
would be grouped as a set for each fundamental frequency as shown in the following table (note that H0 is
the same as the fundamental frequency and that N represents the N
th
data set).
: Dataset Fundamental Harmonic Data
1 F1 (2MHz) H0 (F1) 2.0MHz, V,I,phase
F1 (2MHz) H1 (2F1) 4.0MHz, V,I,phase
F1 (2MHz) H2 (3F1) 6.0MHz, V,I,phase
F2 (13.56MHz) H0 (F2) 13.56MHz, V,I,phase
F2 (13.56MHz) H2 (3F2) 40.68MHz, V,I,phase
… … … …
N F1 (2MHz) H0 (F1) 2.0MHz, V,I,phase
F1 (2MHz) H1 (2F1) 4.0MHz, V,I,phase
F1 (2MHz) H2 (3F1) 6.0MHz, V,I,phase
F2 (13.56MHz) H0 (F2) 13.56MHz, V,I,phase
F2 (13.56MHz) H2 (3F2) 40.68MHz, V,I,phase