The BRAT Test System

BRAT Test System Overview

The Benchtop Reconfigurable Automatic Tester (BRAT) is an economical Commercial-Off-The-Shelf (COTS), flexible test system, based on an open architecture of commercial equipment in a modular design. Its primary use is as Automatic Test Equipment (ATE), either through test programming languages or by the use of the latest object-oriented graphical programming environments. The physical Benchtop Reconfigurable assembly allows easy access to all of the modules as well as room for expansion/reconfiguring, and makes transporting simple. The interface provides over 400 universal analog test points, 192 dynamic digital test points, 32 static digital test points, and 20 two-wire, 50 Ohm dedicated RF paths, reducing the number and complexity of ITAs.

State-of-the-Art Technology

The BRAT features VXI instrument-on-a-card and modular technologies to provide complex testing capabilities in a compact workstation.

High Speed Dynamic Digital

The timing control lines operate at up to 160 MHz while the I/O pins operate at up to 20 MHz. 64K of memory are behind each pin, which can be run continuously or in segments for multiple tests.

Multiple Programmable DC and AC Power Supplies

The power system is a reconfigurable precision power subsystem designed to meet the challenges of high tech ATE.

Operating Environment

The standard operating environment is Windows®. The software packages installed are determined by the user's test requirements.

Multiple Instrument Synchronization

Complete access at the interface of all instrument "trigger" signals allows multiple instrument synchronizations, or "event" testing. This technique can reduce the software overhead for a test and increase throughput.

Measurement Capability to 250 MHz

Dedicated RF channels are used to route signals of up to 3 GHz to the analog bus; however, instrument measurement capability in the standard configuration is to
250 MHz.

BRAT System ComponentsBRAT System Components (BRAT 307B Shown)

  1. PC-Based Controller
  2. Color Printer
  3. Three-Phase AC Programmable Power Supply
  4. Eleven Programmable DC Power Supplies
  5. System Interface
  6. VXI Instrumentation
    • Universal Analog Switching
    • Digital Multimeter
    • Universal Counter/Timer
    • 1553 Bus Analyzer/Simulator
    • Dynamic High Speed Digital Pattern I/O
    • Static Digital Pattern I/O
    • Arbitrary Function Generator
    • Synchro/Resolver
    • Video Card
  1. Digitizing Oscilloscope
  2. RF Rack
  3. RFIU
    • RF Measurement
    • Phase Noise Module (not shown - 308 configuration)
    • RF Converter
    • RF Output
  4. Power Sensors
  5. Network Analyzer
  6. Auxiliary RF Signal Processor/Matrix
  7. Spectrum Analyzer
  8. Performance Analog Upconverters
  9. Power Meter
Other Station Configurations Available

BRAT System Specifications

Computer Windows-Based PC
Test Languages TBASIC Test Language, supports all Windows® applications

Dynamic Digital

192 I/O Pins 3 to 9 ns pin skew
Subcycles of 6.25 ns to 409.6 µs in 6.25 ns steps
20 MHz pattern rate, 160 MHz control timing
64K pin depth
TTL compatible levels (CMOS/ECL/Programmable options available)
External triggering (ECL and TTL)
External clocking
(options for additional digital pins are available)

Static Digital Quad 8-Bit Latch

Four independently programmable 8-bit ports for GPIO handshake modes
TTL Compatible I/O and Control

Digital Multimeter

AC/DC Voltage: Range: 100 mV to 300 V
Resolution: 10 nV to 100 mV
Resistance (2/4 Wire): Range: 100 Ohm to 100 M Ohm
Resolution: 30 µOhm to 30 Ohm
Frequency: Range: 10 Hz to 300 KHz
Period: Range: 0.10 s to 3.33 µs

Universal Counter/Timer

Frequency: Range: 0.001 Hz to 200 MHz
Period: Range: 5 ns to 1000 s
Resolution: 9 digits
AC/DC Voltages: Range: 35 mV p-p to +/-10.2 V p-p (x atten)
Sensitivity: 35 mV (x atten)
Time Interval: Range: 1 ns to 1000 s
Resolution: 2 ns + trigger error (avg)
Rise/Fall Time Range: 15 ns to 1000 s
Pulse Width Range: 5 ns to 1 ms
Ratio Range: 0.001 Hz to 100 MHz
Totalize Range: 0 to [(1.E + 12) - 1]
Trigger Range: +/-10.2 V
Selectable Impedance: (HI Z or 50 OHM)
HI Z: (x 1) 500 K Ohm II 40 pF
(x 10) 1 M Ohm II < 20 pF


Digitizing Oscilloscope

Bandwidth: DC to 500 MHz
Maximum Sample Rate: 5 GSa/s
Maximum Input Voltage: 150 V rms @ 1 M Ohm
Vertical Resolution: 9 bits
Time Base: 1 ns to 10 s full scale


Arbitrary Function Generator

User Defined Waveforms
13-bit resolution, 40 MSa/s
256K sample memory with sequencer
Built-In Functions
Frequency Range:
Sine: to 10.7 MHz
Square: to 5 MHz
Triangle/Ramp: to 100 KHz
Amplitude (50 Ohm):
Range: +/-5.1 V
Resolution: 1.25 µV
Amplitude (Open):
Range: +/-10.2 V
Resolution: 2.5 µV
Additional Modes
Frequency Sweep to 10 MHz
Frequency Hop to 10 MHz
Frequency Shift to 2 M changes/s
Phase Modulate to 500 KHz


Synchro/Resolver Simulator and Indicator

Independent D/S and S/D functions
20-bit binary resolution
Dynamic rate and directions
Reference Input: 26 or 115 V rms
Signal I/O: 11.8, 26, and 90 V L-L
Form C Switch
300 V
5 A


DC Power Supply

Eight programmable DC supplies (300 W ea)
Programmable Resolution: 10 mVA
Modules: 7V/15A


AC Power Supply (Three-Phase) with PFC (5 KW)

Programmable Frequency Range: DC to 5 KHz
Resolution: 10 m
Programmable Voltage Range: 0 to 312 V
Resolution: 10 m
Maximum Current: 1 A
Maximum Voltage: 300 V
> 400 Universal Analog Test Points
Maximum Single Point BW: > 1.5 GHz


Precision PLL Waveform Synthesizer

Frequency Range:
Sine: 100 µHz to 50 MHz
Triangle: 100 µHz to 1 MHz
Square: 100 µHz to 50 MHz
Pulse/Ramp: 100 µHz to 1 MHz
Frequency Resolution: 4 digits
Amplitude: 20 mV p-p to 32 V p-p output open circuit
10 mV p-p to 16 V p-p into 50 Ohm

Frequency Agile Waveform Synthesizer

Frequency Range:
Sine: 100 µHz to 150 MHz
Triangle: 100 µHz to 5 MHz
Square: 100 µHz to 150 MHz
Pulse/Ramp: 100 µHz to 5 MHz
Noise: 100 µHz to 5 MHz
Frequency Resolution: 7 digits
Amplitude: 20 mV p-p to 10 V p-p output open circuit
10 mV p-p to 5 V p-p into 50 Ohm

BRAT Equipment Unconditional Warranty

ATTI warrants that all equipment delivered shall be free from defects in materials and workmanship. ATTI shall, for a period of 6 months from the date of delivery, repair, correct, or replace any equipment which proves to be defective.

ATTI has the option to repair the equipment at the customer's facility, ATTI's facility, or at a third party facility. All shipping charges for returning the unit to ATTI are not included. ATTI will pay the shipping charges for the return of the repaired item.

This warranty is voided if unauthorized modifications to the equipment hardware or software are performed.


BRAT 107B Test System