dp-fra-805 portable frequency response analyser
TRANSCRIPT
DP-FRA-805
FEATURES
• Upto 3 axis simultaneous testing
• Waveform generator with 16-bit resolution
• Two channel analyzer with 16-bit resolution
• Sine, step, ramp, arbitrary waveform generation
• Frequency generation from 1mHz to 2KHz
• Sweeping step size from 1mHz to 500Hz
• Linear and logarithmic step change
• Programmable number of cycles per frequency
• In-built short circuit protection
• On-board 32-bit floating point SHARC DSP
• Gain vs Frequency and Phase vs Frequency measurement
• Software programmable master / slave mode
• Complete isolation for the generated output from the system
• Frequency changes are phase continuous
• Configuration through software files
• Online graph with range selection and zooming
• Textual reports for raw data and analyzed data
• Offline printing for graph
• Isolated, generator & analyzer circuits
• Noise rejection capability
• Ability to analyse non-linear system
• Analyzing the phase and gain characteristics of electro mechanical and electro hydraulics systems
• Antenna control systems
• Frequency response analysis
• Filter characterisation
• Weapons guidance system characterisation
APPLICATIONS
DESCRIPTION
BLOCK LEVEL
GENERATOR BLOCK
DP-FRA-805 is a rugged and portable Frequency Response Analyzer capable of analyzing the phase and gain
characteristics of a system. The system under test is stimulated by the user defined waveform and obtained
response is correlated with the applied stimulus by the on-board DSP processor to determine the phase
difference and the gain.
DP-FRA-805 is used as a stand alone equipment in control system applications such as :
Aircraft Instrumentation/ system controls
Aerodynamics tests - study of applied forces to wing structures
Rocket propulsion and vectoring technology
Filter Characterisation
The DP-FRA-805 consists of
Generator block
Analyser block
Interfacing block
Synchronisation block
Processor block
The generator block comprises of the waveform RAM, a high speed DAC, the filter and the output drive
amplifier.
A 16-bit high speed DAC and the waveform RAM generate the user defined waveform. The user defined
waveform can be a sine, a step, a ramp or any arbitrary waveform of desired frequency. The generated
waveform is then filtered by a fourth order low pass filter to eliminate unwanted high frequency signals.
In sweep mode, both linear and logarithmic sweep options are provided. Smooth stepping from one
frequency to the other is possible. The starting of the waveform at exact 0° and stopping at exact 0° can also be
configured. An additional 16-bit DAC generates a programmable offset.
The Generator circuit is totally isolated from the DSP processor circuit. The power to the generator block is
provided by using a DC/DC converter. Digital signals from the system board to the Generator block are
optically isolated by the high speed opto-couplers.
The output is short circuit protected for a maximum current of 40mA.
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PHOTO TO BE PASTED
Portable Frequency Response Analyser
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DP-FRA-805
ANALYSER BLOCK
INTERFACING BLOCK
SYNCHRONISATION BLOCK
PROCESSOR BLOCK
The Analyzer block consists of two sections namely acquisition section and analyzer section.
In the acquisition section, the two independent programmable gain amplifiers, initially amplify the response and stimulus signals
respectively. The acquisition is then carried out by two 16 bit 200KHz A/D converter which acquires the two inputs at the same instant.
The pacer for these A/D converters are derived from the generator block. This acquisition section is also isolated from system ground using
opto couplers, thus enabling true floating measurements.
The analyzer section involves the DSP processor, which correlates the acquired response signal and the stimulus signal to calculate the
phase and gain characteristics. The noise, DC offset and the harmonics if present in the response signal, are successfully removed by the
DSP processor by using the correlation algorithm. By increasing the integration cycles even a signal buried in noise can be accurately
measured. The analyzed results are provided as an user-friendly visual online graph with range selection and zooming options. Textual
reports for the raw data and the analyzed data are provided. Provision for offline printing of the graph is also provided.
The interfacing block interfaces the PCI bus with the generator and analyzer block. It consists of PCI interface chip and glue logic.
This interface is buffered by a 8 K x 32 dual port static RAM.
The DP-FRA-805 channels can be configured as Master or Slave. The channel in master mode provides synchronization signals to the
channels configured in slave mode. This allows construction of multi Axis systems. The signals are TTL compatible and consist of
waveform clock and synchronization Clock. The DP-FRA-805 is available in single channel and configurable for multiple channels upto
three channels.
The processor block consists of latest processor, Hard Disk, Floppy Disk Drive, CD Rom Drive, Printer Interface, USB, Ethernet and Serial
Interface.
Embedded operating software has provision to store the test results in the system hard disk in binary or text formats. The software has
provision to plot gain and phase graphs which can be printed on a standard external printer.
OUTPUT GRAPHGENERATOR WAVEFORM
H
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DP-FRA-805
GENERATOR
SYNCHRONISATION
GENERAL
ENVIRONMENT
MECHANICAL
No. of channels
Method Direct Digital Synthesis
Resolution 16-bit
Waveform Sine, Square, Ramp, Arbitrary
Waveform memory 256K
Frequency Range: 1mHz to 2KHzResolution: 1mHzError: <0.01%Sweep: Linear, Log
Amplitude Full Scale Output: ±10mV,±100mV, ±1V and ±10vResolution: 1 in 65535Error: <0.1%
Bias Range: -10V to +10VResolution: 1 in 65535Error: <0.1%
Maximum output (Bias+Signal) ±10V peak
Output Impedance 0.6W
Isolation 500V DC
Impedance to ground >10MW/<100pF
Start control 0°,90°,180° or 270°
Stop control Immediate or normal at 0°,90°,180° or270°
Connection ‘D’ type
Output Short circuit protected 30mA
THD 0.01%
Connection 15 Pin ‘D’ type connector
Coupling DC
Signals TTL Waveform Clock, TTL Sync Clock
Isolation to ground 500VDC
12,3,4 channels optional
Interface USB, Serial Port, Parallel Port, LAN
Commercial version only
421mm (W) x 282mm(H) x 230mm (D)Weight 15kgs.
ANALYSER
ORDERING INFORMATION
No. of channels
Resolution 16-bit
Input range ±10mV, ±100mV, ±1V and ±10V
Maximum input, Hi or Lo to ground connection 500V DC, ‘D’ type
Impedance to Ground >10MW/<100pF
Input impedance ³10MW
Input protection ±42V
Common mode rejection >65dB
A/D Conversion Time 10msec (max.)
Throughput 100KHz
Measurement accuracy 0.01% of full scale
Integration time Minimum: 1 cycle
Maximum: 1000 cycles
Measurement delay 0 to 10 cycles
Limit of error
For Gain = 1, 10 and 100
Amplitude accuracy 0.1% Freq < 100Hz
1% Freq > 100Hz
Phase accuracy 0.1° Freq < 100Hz
1° Freq > 100Hz
For Gain = 1000
Amplitude accuracy 0.1% Freq < 100Hz1% 100Hz<Freq<500Hz
Phase accuracy 0.1° Freq < 100Hz1° 100Hz<Freq<500HzPhase error undefined when inputs atnoise threshold
Report generation Graphical, Textual
Maximum input, Hi or Loto ground connection 500V DC
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DP FRA 805 3 1 0
Factory options specified based on applications
1-3 : Numbers of axis configured
3 - Commercial version
SPECIFICATIONS
RELATED PRODUCTS: DP-cPCI-7554 Frequency Response Analyser DP-PCI-755 Frequency Response Analyser
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DP-FRA-805
GENERATOR 1
(MASTER) UNIT UNDER TEST
AXIS 1
ANALYSER 1
ANALYSER 2
GENERATOR 2
(SLAVE) UNIT UNDER TEST
AXIS 2
ANALYSER 3
ANALYSER 4
TO NEXT AXIS
TYPICAL MULTI AXIS APPLICATION
SYNCHRONISAT
ION
UNIT UNDER TEST
AXIS 1 GENERATOR
ANALYSER 1
ANALYSER 2
TYPICAL SINGLE AXIS APPLICATION H
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