TTI LTX-5510 Manuale utente

Operating Instructions

Terahertz Technologies Inc. 169 Clear Road, Oriskany, NY 13424 (315) 736-3642 FAX (315) 736-4078

E-mail [email protected]

6/2011

LTX-5510 and LTX5515

Fiber Optic Link

Quick Start Page

1. Connect a multimode ber optic patch cord between the ST connectors on the rear panels

of the LTX-551XT (transmitter) and the LTX-551XR (receiver).

2. Set the transmitter controls as follows: POWER - Off

INPUT Z - 1 M

RANGE - ± 5 V

3. Set the receiver controls as follows: POWER - Off

4. Connect the power supply plugs to the connector on the back of each unit.

5. Plug the power supplies into a wall socket.

6. Connect a signal source to the transmitter Input BNC connector.

7. Connect the receiver output to an oscilloscope.

8. Switch the receiver power switch to ON. (NOTE: The order of steps 8 and 9 is crucial)

9. Switch the transmitter power switch to ON.

10. The input signal should now be visible on the oscilloscope.

Contents

Introduction............................................................................................................................1

Unpacking and Inspection............................................................................................1

Power Considerations......................................................................................................1

Description / Features......................................................................................................2

Theory of Operation......................................................................................................3

Operating Considerations.....................................................................................................4

Specifications..............................................................................................................5

Service/Warranty Information..........................................................................................6

Introduction

The LTX-551X Electrical to Optical and Optical to Electrical Converter system comprise a convenient

product that is intended to transmit analog and digital information to a remote location via ber

optic cable. Its primarily designed to be used in those situations where the signal of interest has a

high common mode voltage with respect to the measurement equipment. Such situations arise in

plasma physics experiments, power transmission equipment, and high power laser systems. Trigger

information from electrically noisy sources such as high current discharge laser systems may be

transmitted without conducting Electro-Magnetic Interference, (EMI) to the measurement or control

equipment.

Thees systems transmit an analog signal plus four digital input channels simultaneously. The input

analog signal may range in frequency from DC to 12.5 MHz (-3 dB point) for the LTX5510 and DC to

25 MHz (-3 dB point) for the LTX5515. The digital signals may switch at up to 12 MHz rates for the

LTX5510 and at up to 25 MHz rates for the LTX5515, and are independent. The analog input may

be terminated at 1 Megohm or 50 Ohms depending on the front panel switch. The output impedance

is always 50 ohms. Analog signals may range from -5 to +5 volts. The output signal will have a one-

to-one correspondance, i.e. a gain of +1. When the front panel selector switch is set to +/- 1V F.S.

the gain is +5, ie. a 1 volt input signal will result in a ve volt output signal. The digital inputs accept

TTL, CMOS or LVTTL levels and output LVTTL levels, i.e. 0 to 3.3V for a logic zero and logic one

respectively. The sense is non-inverting.

Unpacking and Inspection

Prior to shipment this instrument was inspected and found to be free of mechanical and electrical

defects. Upon acceptance by the carrier he assumes responsibility for its safe arrival. After unpacking,

examine the unit for any evidence of shipping damage. Should you receive this instrument in a

damaged condition, apparent or concealed, it must be noted on the freight bill or express receipt and

signed by the carrier’s agent. Failure to do so could result in the carrier refusing to honor the claim.

Upon ling a claim TTI should be notied.

Power Considerations

The LTX-551X Transmitter and Receiver operate from a regulated 9 VDC wall-mount power supply.

These power supplies operate with line voltages ranging from 95 to 260 VAC, 50-60 Hz. Four

interchangeable power line connectors are supplied that are compatible with connectors used in

North America, Continental Europe, Australia, and the United Kingdom. Do not use with any other

wall-mount supply or damage may result.

Description / Features

Power Switch

Input Overload

Indicator

Input Impedance

Selector

Input Range

Select

Digital Input

Connector

Analog Input

Connector

Power Switch

Optical Signal

Indicator

(good when lit)

Digital Input

Connector

Analog Output

50 ohms

LTX551X Transmitter

LTX551X Receiver

Theory of Operation

The LTX-5510T amplies, lters and digitizes the input analog signal to 12-bit precision at a 50 MS/s rate

and the LTX5515T at 100MS/s. The twelve bit digital data from each sample is combined with the state

of the four digital input channels to form a sixteen bit word. This word is converted to an 8b/10b code

and transmitted as a twenty bit word. This process is repeated at a 50 MHz for the LTX5510, resulting

in a 1 Gb/s data stream and at a 100 MHz rate for the LTX5515 resulting in a 2 Gb/s data stream. This

data is converted to an optical bitstream and transmitted via a user-supplied optical ber to the LTX-

551XR receiver.

The LTX-551XR receives the optical bitstream and converts it to a digital signal. It then decodes and

de-multiplexes this data. Twelve bits are presented to a fast D/A converter and post amplier which

drives the analog output port and four bits are latched and presented at the digital output ports. The

system is intended to be used with 50/125 uM or 62.5/125 uM ber optic cable. (The LTX-551XSM is

intended for use with single mode ber).

Upon energizing the LTX-551XT, it transmits framing characters for a few seconds so that the receiver

can determine where a valid word in the data stream begins and ends. The receiver is phase-locked

to the transmitters data rate and will remain so unless the optical signal is disrupted in some fashion

such as removing an optical ber or power to one of the units.

Operating Considerations

The LTX-551X system may be used to transmit signals from a source that is distant or at a different

ground potential with respect to measuring devices such as an oscilloscope. The input signal must

be in the range of 0 - ± 1 V or 0 - ± 5 V depending on the range selected. Digital signals may be

transmitted as well. TTL, CMOS or LVTTL level signals are acceptable. The output signals are LVTTL

( 0-3.3 V).

For high speed signals transmitted via any signicant amount (electrical length comparable to rise/fall

times) of coaxial cable, a 50 ohm termination may be switched in to preclude distortion and reections

from a mismatched transmission line.

The power supply for the unit must be at roughly the same potential of the signal common mode

voltage. For example, using the unit at a 10 000 V potential while it is utilizing the wall mount power

supply at conventional line potential will result in a hazardous situation and certain damage to the

equipment. An isolation transformer with sufcient isolation voltage rating must be used to power the

wall mount supply.

The length of ber optic cable that may be used with the LTX5510 is typically 300 M for 62.5/125um

ber or 500 M for 50/125um ber and for the LTX5515 the typical distance is 150M for 62.1/125um

ber and 300 M for 50/125um ber. Fiber bandwidth and not loss is typically the limiting factor for

range with multimode units. The single mode version is limited by loss. Typical ranges of 10 km may

be achieved with this model using single mode ber.

When setting up the LTX-551X system, note that the transmitter must be turned on last! This

allows the receiver to detect the synchronizing framing characters. Meaningless signals will otherwise

be generated. Should sync be lost by disconnecting the optical ber, simply turn the transmitter off

and on.

The red LED labeled O.L. indicates that the input signal exceeds the maximum input voltage for the

range in use.

The green LED on the receiver indicates that the receiver is operating with an adequate optical input

signal. If the indicator goes out, the transmitter has lost power or the connecting ber is disconnected

or broken.

The controls and their functions are indicated on the following pages.

The output signal from the receiver has a 10 V peak to peak output into an open circuit. The

maximum output into a fty ohm load is 4 V peak to peak.

DIGITAL INPUT/OUTPUT

CONNECTIONS

Digital Ground

Chan. 5

Chan. 2

Chan. 3

Chan. 4

TTI reserves the right to change specications without notice

Specications

LTX-5510 LTX-5515

Analog Signal Bandwidth DC to 12.5 MHz (-3 dB) DC to 12.5 MHz (-3 dB)

Input Voltage Ranges +/- 1 V or +/- 5 V (selectable)

Resolution 12 Bits

Transfer Accuracy +/- 0.1% Full Scale, +/- 20 mV offset

Signal Latency (with one meter of ber) Approximately 300 nS

A/D Sampling Rate 50 Megasamples/S 100 Megasamples/S

Input Impedance 50 Ohms or 1 Megohm || 20 pF, (selectable)

Output Drive Capability +/- 5 V open circuit, +/- 2 V into 50 ohm load

Output Impedance 50 Ohms

Digital Inputs TTL, LVTTL, CMOS compatible

Digital Outputs LVTTL ( 0 - 3.3 V)

Digital switching Rates 0 - 12 MHz 0 - 24 MHz

Digital Signal Edge Uncertainty 0 - 20 nS 0 - 10 nS

Laser Wavelength LTX-55XX-850; 850 nm+/- 20 nm, LTX-55XX-1310; 1310 nm +/- 20 nm

Optical Transmission Rate 1.0 Gb/S 2.0 Gb/S

Loss Budget 15 dB max

Optical Return Loss > 15 dB

Laser Safety Classification Class I safety per FDA/CDRH and

IEC-825-1 regulations

Typical Trans. Distances (850nm) 500 M - 50/125µ ber

300 M - 62.5/125µ ber

250 M - 50/125µ ber

150 M - 62.5/125µ ber

Typical Trans. Distances (1310nm) >10 KM with 9/125 micron ber

Fiber Optic Connectors ST standard, FC optional

LED Annunciators Provided Input Overload (TX), Optical Signal (RX)

Power Supplies Universal Wall Mount, W/US, UK, Continental Europe and Australian plugs

Power Requirements 95-260 VAC, 50-60 Hz, 16 VA Max

Operating Temperature 0 - 40 C

TX Dimensions (mm) 175 L x 105 W x 40 H

RX Dimensions (mm) 175 L x 105 W x 40 H

Weight (each) 0.46 Kg

Standard Warranty 2 yrs, Components and workmanship, 30 day Satisfaction Guarantee

Accessories Supplied 5 pin DIN connector for digital inputs/outputs, TX and RX

Service and Warranty Information

Service Information

Products manufactured by Terahertz Technologies Inc.(TTI) are designed and fabricated to provide

reliable performance. However, in the event that service is required, both telephone technical

assistance and factory repair services are available. Call (315) 736-3642 for information.

For IN-WARRANTY REPAIRS, call us to obtain a Returned Material Authorization number, (RMA

Number). All products are to be returned to TTI with freight charges pre-paid. Those products sent

under warranty will be returned to our customers pre-paid. We cannot be responsible for returned

products that do not reference the TTI RMA number.

For OUT-OF-WARRANTY repairs, services are billable for both time and materials.

LIMITED WARRANTY

TERAHERTZ TECHNOLOGIES INC. (“TTI”) WARRANTS THAT TO THE FIRST PURCHASER, FOR A

PERIOD OF TWO YEARS FROM THE DATE OF RECEIPT, THAT THIS PRODUCT (“THE PRODUCT”)

WILL BE FREE FROM DEFECTS IN MATERIALS AND MANUFACTURING. THE FOREGOING

WARRANTY IS THE ONLY WARRANTY, EXPRESS OR IMPLIED, GIVEN BY TTI, I.E., THERE IS NO

WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. TTI HEREBY DISCLAIMS ANY EXPRESS

OR IMPLIED WARRANTY OTHER THAN THE WARRANTY IN THE FIRST SENTENCE TO THE

FULLEST EXTENT PERMITTED BY LAW. THE SOLE AND EXCLUSIVE REMEDY UNDER THIS

WARRANTY IS REPAIR OR REPLACEMENT AT TTI’S OPTION OF ANY PRODUCT THAT PROVES

TO BE DEFECTIVE IN MATERIALS OR MANUFACTURING WITHIN TWO YEARS OF RECEIPT OF

THE PRODUCT. NOTE: THIS WARRANTY DOES NOT APPLY TO ANY PRODUCT WHICH HAS BEEN

SUBJECT TO MISHANDLING, MISUSE, OR SERVICE BY UNAUTHORIZED PERSONNEL OR TO ANY

PRODUCT WHICH HAS BEEN DAMAGED, MODIFIED, ALTERED OR TAMPERED WITH.

TO THE FULLEST EXTENT OF THE LAW, TTI DISCLAIMS ALL LIABILITY FOR ANY OTHER

DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES ALLEGED TO BE CAUSED BY A

DEFECTIVE PRODUCT, I.E., TTI WILL NOT BE RESPONSIBLE FOR ANY PERSONAL INJURY,

PROPERTY DAMAGE OTHER THAN THE COST OF REPLACING THE PRODUCT OR ANY OTHER

MONETARY DAMAGE SUCH AS LOST WAGES OR PROFITS CAUSED BY ANY USE, ATTEMPTED

USE OR INABILITY TO USE THE PRODUCT. NOTE: BY USING THE PRODUCT, YOU AGREE

THAT REPAIR OR REPLACEMENT AT TTI’S OPTION WILL FULLY SATISFY TTI’S WARRANTY

OBLIGATION TO YOU, WHETHER IN CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY OR

OTHER APPLICABLE LAW.

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