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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