MI-789 Auxiliary Controller

 

MI-789

  • Provides complete control over the acquisition process 
  • Controls a beam steering computer as part of the real-time acquisition 
  • downloadpdfDecreases acquisition times by 3x to 10x compared to vector network analyzers (VNA) alone
  • Provides extended capabilities to the basic MI-350 system
  • Controls up to 16 channels of external RF 
  • Multiplexers for vector network analyzers
  • Controls frequency triggering of external signal sources

 

The MI-350 Advanced Microwave Measurement System can optionally include the MI-789 Auxiliary Controller to provide extended capability for more complex systems. Besides the multi-frequency, multiport acquisition capability of the base MI-350 system, the MI-789 adds multi-beam control and triggering to the real-time data acquisition process. The beam steering interface includes two ports that can be connected to the user’s equipment to signal a change in beam state. This enables multi-beam measurements to be made on-the-fly in the same way that basic multi-frequency, multi-port measurements can be made.

The MI-789 also provides more control over the acquisition process, allowing the sequence of measurement conditions to be optimized for the fastest acquisition process. The order in which beams, channels, and frequencies are switched can be configured so that slower switching devices are changed less often. This effectively optimizes acquisition speed for the types of devices used in a given test.

When used in conjunction with an MI-750 Receiver, the MI-789 supports a “frequency-beam” pair mode. In this mode, a single beam pattern is associated with each frequency.

Measurement systems that use commercially available vector network analyzers can also benefit from using the MI-789 Auxiliary Controller. The MI-789 has the ability to accept a position trigger from the position controller, generate triggers to the vector network analyzer to collect measurements, and coordinate the switching of multiplexers, frequency, and beam states at appropriate times. It reads and buffers data from the network analyzer for later communication to the MI-3000 Data Acquisition and Analysis Workstation­ – over the Ethernet interface. By implementing these functions in a combination of hardware and real-time embedded software, the MI-789 provides a real time interface that is significantly faster and more effective than a Windows-based PC alone.

Lastly, a self test feature has been added to the front interface panel. This feature allows for ease of hardware troubleshooting, as it can be used to verify the MI-789 is functioning and communicating with the other components in the system.

 

Specifications

Characteristic Description 
Control Interfaces

10/100BaseT Ethernet using TCP/IP

VNA Interface 10/100BaseT Ethernet using TCP/IP

Trigger Bus Interface

Five Differential Real-Time Signals
Programmable Pulse Width



Frequency Trigger Pulse Width
VNA Trigger Pulse Width
AUX Out Pulse Width

Frequency Settling Delay
External Multiplexer Delay

Maximum Range 

65.5 mS
65.5 mS
65.5 mS
65.5 mS
65.5 mS

Resolution

1 uS
1 uS
1 uS
1 uS
1 uS

Control Interfaces (2 ports)
Beam Steering
Auxiliary Control

Data
Control Signals
Logic Level
DC Power

 


Strobe Out Pulse Width
Data to Strobe Delay (with Sync)
Data to Strobe Delay (no Sync)



 

16 bits, Parallel Output
Strobe Output, Input Acknowledgment
Differential LVTTL (RS-422 Compatible)
+/- 18 VDC

Programmable Timing
Maximum Range

65.5 mS
65.5 mS
65.5 mS

 

 

 




Programmable Timing
Resolution

 

65.5 mS
65.5 mS
65.5 mS

Multiplexer Interfaces (2 ports)

Compatibility
Control Signals
Logic Level
DC Power

 

 

MI-3320 and MI-759 Series Multiplexers
2 Bits per Port
Differential LVTTL (RS-422 Compatible)
+/- 18 VDC

 

Auxiliary BNC Interfaces (2)

Control Signals
Logic Level

 

 

Programmable as Input or Output
TTL

 

Timing Latency

Hardware Input Response
Hardware Output Response
VNA Read after Sweep Complete

 

Delay

1 uS max.
1 uS max.
8 mS typical

 
 AC Power Requirements 90 -264 VAC, 47 - 63 Hz, 3.5A 
Environmental  0-95% Humidity, Non-Condensing