GFT2002 Time Interval Meter

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GFT2002 Time Interval Meter | Manualzz

FEATURES

• Two Channels (Start, Stop)

• 1ps one-shot time resolution

• < 5ps rms time interval jitter

• ± 1 second time interval range

• 19’’, 1U rack

• Ethernet interface

GFT2002

Time Interval Meter

APPLICATIONS

• Components Test

• Jitter Analyzer for Telecom

• Lab / R&D characterizations

• Measure jitter and skew

• Real Time, Time stamping

• Variation in Pulse Timing

DESCRIPTION

The GFT2002 is very precise time interval analyzer with low jitter. It has two inputs: one Start and one Stop. Reading data represent the time interval between one start and one stop.

Trigger level and slope are adjustable on each input. The module uses a linear interpolation technique and an internal calibration to obtain very high accuracy.

The module uses an internal 10MHz very stable oscillator or an external 10 MHz source.

All parameters may be local controlled over front panel keys and LCD display and remote controlled over Ethernet and Internet (Internal web server) interface (10 / 100Mb/s).

The user can open a web page to control the device via Internet explorer, Mozilla Firefox or

Chrome.

CONTROL PANEL WEB PAGE

This web page, from embedded Web server, provides a simple method to:

• Configure settings for each channel

(START, STOP)

• Read results

• Control operation and status of the instrument.

The configuration information of the instrument is stored in the GFT2002

.

GFT2002 control panel web page www.greenfieldtechnology.com

GFT2002 Time Interval Meter

SPECIFICATIONS

Inputs start or stop

Threshold -5 to + 5V

Slope

Input gate

Threshold

Coupling

Time interval

Rising or falling edge

+1.5V (fixed)

DC – 50Ω

Range

Trigger rate

Resolution

Error

RMS jitter

Arming mode

Event counting

Range

Count rate

- 1 to +1 second

0 to 20kHz

< 1ps, single shot

< 250ps + time interval x 10 -9

5ps typically

On start, on stop, on gate

0 to 10 000 000

0 to 10MHz

Internal with 1 s duration or duration of input gate Gate

System

Calibration

Functions

Output 10 MHz

Signal

Input 10 MHz

Signal

Coupling

Internal

Time interval, event counting

Square wave, 2.5Vpp, AC coupling

1V nominal (automatic detection)

AC - 50Ω

Clock

Time base

Stability

Accuracy

10MHz ovenized

+/- 0.005ppm

10 -9

General

General interface Local front panel, remote via Ethernet

Size

Connector

Power Supply

19’’, 1U, 30cm

BNC

< 40 W / 90 – 240 V /50 – 60Hz

Software

interface

Web page

Option

Option 1

Free driver for windows 7 / 8

Internet explorer, Chrome, Firefox

Optical input compliant to GFT3001 for timing system

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GFT2002 Time Interval Meter

FUNCTIONAL OVERVIEW

Block diagram

The time interval meter includes receiver with signal conditioning, a clock reference, a high resolution time system and an interface controller.

10 MHz 10MHz

Calibrator

IN OCXO

Timing system

IN

Gate

Start

Receiver &

Data decoder

Clock controller

Driver

10 MHz

OUT

Linear interpolator

Timing controller

Time counter

Stop

Linear interpolator

Keyboard display

Input

Interface Controller Ethernet control

Block diagram

Receiver (Start / Stop)

Each channel receiver consists of a threshold programmable fast comparator and a switch used to select the active slope.

Time system

Interval mode: The time interval result is obtained by processing the two following information

- Coarse information provides by a wide range (32-bit) and high count rate ( 155 MHz) time counter

- Fine information coming from a linear interpolator that analyses a ramp signal started by the event on Start (or Stop) input.

The GFT6002 uses an internal calibration function to obtain very high accuracy.

A gate input can be used to enable all Start or Stop events as desired.

Event mode: In this mode the GFT2002 counts events at Start and a Stop inputs. Event counting can be internally gated or externally gated through the duration of input gate.

Clocks

The GFT2002 provides an internal low jitter clock locked on a 10 MHz internal reference.

It provides also 3 connections

- 10 MHz input: for 10MHz external reference

- 10 MHz output: Clock reference output for clocking external equipment

- OPT: 155 MHz external clock reference from Timing System (option)

Interface

- The Ethernet interface is intended for stand-alone operation.

- The front panel Key board and LCD display allow local control.

Option

The GFT2002 can be connected to the Greenfield Technology Timing system.

In this mode the clock and the Start is from the GFT3001 (Master Oscillator Transmitter) via optical network.

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ENCLOSURE

Front panel

GFT2002 Time Interval Meter

Rear panel

Start Stop Gate Led LCD display Key board

10MHz output 10MHz input

CONNECTOR, SWITCH, INDICATORS

Front panel

START

STOP

GATE

PWR

BUSY

F1

F2

Rear panel

Start pulse input: BNC connector

Stop pulse input: BNC connector

External Gate input: BNC connector

Indicator: Power On

Indicator: Measurement running

Indicator: Mode timing system On

Indicator: N.A

10 MHz Output

10 MHz Input

OPT

Plug

Red switch

LAN connection: RJ45 connector

External 10MHz reference input: BNC connector

10 MHz reference output: BNC connector

Timing System input: SC/PC connector

AC power plug (90-240V)

Power On/Off switch

AC Power

ORDERING INFORMATION

Model

GFT2002

GFT2002-OPT

Description

Time Interval Meter base version

Option: Adds Optical input for timing system mode

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