SDI NMSC-2 Manuale utente

NMSC-2

Quick Start Guide

SDI

Table of Contents

Introduction………...……...………………………………………….. 3

Hardware Installation…...……………………………………………. 4

Quick Start Guide…………………………………………………….. 7

Sample results ……………………………………………………….. 19

SDI

Introduction

The Noise Measurement System is a modular instrument that may be

customized to implement a versatile dual-channel noise measurement system. The

measurement system may be used to make both AM and PM noise measurements on

signals in the frequency range of 1 MHz to 45 GHz. Custom detector modules may be

added to extend the carrier frequency measurement range. The measurement system

is composed of modules that plug into the measurement system instrument crate. The

instrument crate dimensions are 5U X 19” X 16”. The instrument crate is included with

the purchase of a Noise Measurement System Controller (NMSC).

The NMSC-2 module contains a dual-channel spectrum analyzer. Dual channel

cross-correlation measurement techniques can be used to measure signals that are

lower than the system noise floor. The front panel has a 6.4 inch XGA color touch-

screen display. An external keyboard, monitor and printer can also be connected to the

controller. Remote measurements or monitoring are possible using the Windows XP

remote desktop software and an Ethernet connection.

There are six slots available on the noise measurement crate for the various

measurement modules. Two noise detector module series are currently offered that

cover the frequency range of 1 MHz to 45 GHz. The ND-1 series of modules covers

the frequency range of 1 MHz to 1 GHz. The ND-3 series of modules covers the

frequency range of 1 GHz to 45 GHz. Custom modules may be ordered to extend the

frequency range or implement special measurement topologies. All the noise detector

modules are designed to facilitate the measurement of sources as well as passive and

active components. For source measurements, the reference and device under test

are phase locked with programmable PLL bandwidth to accommodate measurements

of wide tuning voltage controlled oscillators to very stable ultra-low noise oven

stabilized oscillators. Noise in amplifiers, multipliers, mixers and other active and

passive components can be measured easily with the addition of one of the

programmable delay line modules.

Calibration of the Noise Measurement System can be accomplished easily

using a noise source module, NS-NM or a tone calibration module, TC-NM. The

system can also be calibrated by using the traditional beat note calibration method.

Calibrated noise source modules and tone calibration modules can be ordered for any

frequency range of interest.

SDI

Hardware Installation

NMS INSTRUMENT CRATE DESCRIPTION

The NMS Instrument Crate is a NIM (Nuclear Instrumentation Module) standard

crate that has been configured to provide communication busses and power for the

Noise Measurement System Controller (NMSC) and Noise Detector Modules. Using

NIM modules not specifically designed for the Crate is not recommended and could

result in damage to the system.

The left front mounting plate of the crate contains the crate power switch and

power LED. Modules are installed onto the front of the crate by means of 12 nylon

guiding rails. There are 12 module spaces, however the NMS controller will occupy the

first six spaces, leaving six spaces for various Detector modules. Each module has two

or more thumb screws that secure it to the NMS Instrument Crate. The NMS Modules

are not “hot swappable”. This means that NMS Instrument Crate power supply needs

to be turned off, before removing or inserting any modules. This can be done by

turning the front panel power switch to the off position.

The NMS Controller must be installed into leftmost six spaces. Not doing so will

result in damage to the modules, and or controller. The rest of the spaces on the NMS

Crate can contain any of the detector, or synthesizer modules provided by

SpectraDynamics Inc.

The back of the NMS Instrument Crate has two circular power connectors and

LED indicators. The 14 pin connector delivers power to the NIM Modules while the 24

pin connector delivers power to the NMSC-2 controller.

NMS RACKMOUNT INSTALLATION

The NMS is designed to be rack mounted on standard 19" wide racks. The

NMS Crate has 5U non-removal rack mount handles, while the external power supply

has removable 2U rack handles. It is important that there is enough clearance behind

the NMS Crate and DC Power Module for proper air circulation. Blocking any fan

exhaust could cause the system to fail due to a thermal overload.

NMS BENCHTOP INSTALLATION

The NMS also supports tabletop operation. Four rubber feet are included with

the NMS Crate. These attach to the bottom of the crate and should only be used for

tabletop operation. Enough clearance behind the NMS Crate and DC Power Module is

necessary for proper air circulation. Blocking any fan exhaust could cause the system

to fail due to a thermal overload.

SDI

Hardware Installation

NMS POWER SUPPLY INSTALLATION

The DC Power Module must be placed as far away from the NMS Instrument

Crate as possible. The power cables that are provided with the system are 8 feet in

length and must be securely connected to their mating connectors. The 24 wire cable

delivers power to the controller, while the 14 wire cable delivers power to the crate.

Once the DC and ATX power cables are connected, the DC Power Module must be

turned on. The Master Power Switch is located on the rear of the DC Power Module.

CAUTION! DO NOT TURN OFF THE MASTER SWITCH UNLESS POWER TO THE

NMSC-2 CONTROLLER AND THE NMS CRATE IS TURNED OFF. Turning this

switch off will immediately cut power to the computer and the NMS Instrument Crate.

SDI

Hardware Installation

NMSC MODULE INSTALLATION

The NMS Controller is the heart of the noise measurement system. It is

composed of a Pentium Dual Core based computer and a high-speed digitizer. It also

has a resistive touch screen LCD. The Windows XP operating system was chosen

because of its popularity. The front panel also contains a standard USB 2.0 connector

and the NMSC power button. It is important not to use the NMSC controller as a

general-purpose computer since processor intensive applications will not allow the

noise measurement software to execute properly.

The back panel contains most of the input/output ports. There are four USB, two

serial, one firewire, one keyboard ,one mouse, one LAN and one parallel port that can

be used to connect to other peripherals such as printers, portable hard drives, etc.

There are also VGA, optical and audio connectors that can be used to connect to

external multimedia devices. The digitizer input and output ports are also located at the

back of the module. The Detector module output ports need to be connected to the

digitizer input ports before any measurement can be made.

The NMS Controller module slides into the first six module spaces of the NMS

Instrument Crate. There are 4 thumb screws that bolt the module in place. If a mouse,

keyboard or external display are to be used, these must be connected to the module

before turning the power on. Once the NMS Controller is in place, pressing the power

button will turn the computer on. Please be aware that turning the Master Power

Switch off while the computer is running could cause the computer hard drive to fail.

NOISE DETECTOR MODULE INSTALLATION

A variety of noise detector modules are available from SpectraDynamics Inc.

These modules can be installed into any of the six spaces to the right of the NMS

Controller. To install a module, slide the module into any of the six guiding rails and

bolt the module in place using the thumb screws attached to the front panel of the

module.

Once all modules are installed power may be applied to the NMS Crate by

turning on the "DC POWER" switch located on the front of the NMS Crate.

SDI

Quick Start Guide

INTRODUCTION

The purpose of the quick start guide is to go through the steps necessary to

make a single channel measurement. Most of the major functions in the software have

a quick description explaining their function. To access the quick description just point

the mouse or pointer to the button or tab and leave the pointer on the object for a few

seconds.

NMSC POWER ON

The NMSC-2 Controller has a POWER ON button on the front panel just below

the screen. The NMSC POWER ON button only powers the NMSC controller and will

not turn on power to the instrument crate. To apply power to any of the detectors you

must turn on the Chassis DC POWER SWITCH located on the lower left hand corner

of the chassis.

To turn on the NMSC controller press the POWER ON button. The NMSC

controller will boot up to a Windows XP screen. The measurement software

executables are under the C:\NMSC-2 directory. There will be a NMSC shortcut icon

on the desktop. Click on the icon to run the measurement system software.

NMSC CHASSIS POWER ON

The power to the noise detectors is supplied through the instrument crate. Make

sure that the crate power is OFF when a noise detector is inserted or extracted from

the system. THE NOISE DETECTORS ARE NOT HOT PLUGGABLE. The chassis

power is independent of the NMSC controller power and this power may be switched

on/off even when the measurement system software is running.

SDI

Quick Start Guide

The NMSC software will load to an initial screen with the name of the software

and the company name. Once the system initializes it will change to the FFT

measurement screen shown below.

SDI

Quick Start Guide

ASSIGN THE NOISE DETECTORS TO A MEASUREMENT CHANNEL

On the bottom of the FFT screen there is a series of tabs that access different

control pages. Select the tab marked Detector to access the Noise Detector Setup

Page. The following page will appear.

Press the ASSIGN DETECTOR button.

The assign detector screen will open.

SDI

Quick Start Guide

Press the SCAN button.

This will scan the chassis for available noise detectors. The model number and

frequency range of the detectors should appear in the corresponding bin position on

the screen. Use the drop down selection button to select a Noise detector to be used

on Channel 1 of the system and if more than one detector is installed you may select

the Noise detector that is to be assigned to Channel 2 of the system.

Press the EXIT button once you have made your selection.

CONNECT RF CABLES

Once the detectors are assigned to a measurement channel make sure to

connect the IF OUTPUT of the detector to the NMSC controller CH 1 or CH 2 inputs

(as selected) on the rear of the NMSC controller. Make sure to use the supplied BNC

cables that have the ferrite bead clamped on the cable. The ferrite beads are essential

for low noise measurements.

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