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5612 DC-1 MHz FIBER OPTIC TRANSMITTER

5613 DC-1 MHz FIBER OPTIC DUAL RECEIVER

ALLOWS MEASUREMENT OF SIGNALS RIDING ON KILOVOLTS OF COMMON MODE POTENTIAL


LeCroy optical analog links are suitable for a variety of applications where it is difficult or hazardous to change transmission conditions once a test has begun. Electric power line monitoring, high current testing, EMP testing, weapons simulation experiments, EMC testing, fusion research, high energy physics, and high explosive research are just a few examples of this type of application. The Model 5612 Transmitter and Model 5613 Receiver feature a dual fiber interface which bidirectionally links the transmitter and the receiver. Signal data is transferred from the transmitter to the receiver on one of the optical fibers and control data is transferred from the receiver to the transmitter on the other fiber. This two-fiber system allows for remote verification of calibration, remote control of transmitter input signal range, and remote control of transmitter on/off status.

Using FM signalling techniques, the Model 5612 Transmitter and the Model 5613 Receiver form a link with a wide signal-to-noise ratio, typically 54 dB, in a bandwidth from DC to 1 MHz. The transmitter is battery powered for complete isolation and a battery charging circuit is built in. Spark gap protection devices limit large potential transients and Automatic Gain Control (AGC) avoids changes in sensitivity due to signal strength or transmission loss variations. The transmitter can be controlled either through front-panel switches on the receiver module or by computer via an IEEE 583 (CAMAC) Interface. The analog output of the receiver can be modified to be as much as ±10 V and is compatible with LeCroy transient recorders and waveform digitizers.

FEATURES

Dual Channel Receiver - In order to provide maximum cost effectiveness, the Model 5613 Receiver has been designed to be dual channel, reducing the cost per channel of the overall link system.

Excellent DC Stability - The Model 5612 and the Model 5613 have been designed to provide very high DC stability in order to eliminate the need for tedious and inaccurate calibration adjustments to compensate for changes in ambient conditions.

Wide Dynamic Range - A signal-to-noise ratio of 54 dB typical and 48 dB guaranteed allows transmission of analog signals with 9-bit resolution. This resolution, in conjunction with the linearity and DC stability of the overall system, makes the 5612 and the 5613 ideal solutions to applications requiring highly accurate signal transmission of fiber optic cabling.

Battery Powered Transmitter - Since the Model 5612 Transmitter is battery powered it may be connected directly to the device on which a measurement is being made. This allows it to float at the potential of the device under test, providing it with the ability to measure even very small signals (200 mV full scale) riding on very high common mode potentials.

Built-In Charger - A built in battery charger and AC adapter cord are provided with each Model 5612 Transmitter. This, in conjunction with the remote battery test feature and the ability to remotely turn the transmitter on and off, allows for operation in applications where the transmitter must be placed in locations which are not easily acces sible for long periods of time.

Local/Remote Control - All functions can either be set by front-panel switches on the Receiver module or controlled via an IEEE 583 (CAMAC) interface by computers such as an IBM PC, DEC µVAX and others.

FUNCTIONAL DESCRIPTION

The Model 5612 Transmitter and the Model 5613 Dual Receiver, together with a pair of optical fibers, form a complete analog fiber optic link. They provide a practical means by which analog signals from transducers in noisy or high electrical potential environments can be monitored.

The 5612 Transmitter features input protection with spark gap, varistor, and zener/resistor circuits, along with battery powered operation. The internal battery on the 5612 can operate for a period of 24 hours when fully charged. If it is switched to standby when not in use, the 24-hour battery charge can be spread over a long period of time without recharging. Power can also be supplied from an external +12 V DC supply. This external supply need not be tightly regulated. A 3-position slide switch inside the rear cover of the 5612 determines whether the unit is powered internally or externally. The center position of the slide switch turns the unit off. In order to prevent the discharge of the battery, the transmitter should be turned off when not in use. The charger may be used to power the 5612 but in this case the battery will not be charged to capacity.

Another slide switch inside the rear panel of the 5612 determines whether the transmitter will be controlled locally or remotely using the control fiber. In local mode, the gain of the transmitter can be adjusted using a 16-position switch located inside the rear panel. In remote mode the gain, on/off status, battery check mode, and calibration mode may all be entered via the front panel of the Model 5613 Receiver module or by a remote computer via an IEEE 583 (CAMAC) interface.

The Model 5612 enclosure has been designed to operate in high EMI environments. Signal integrity is maintained even in the presence of electromagnetic fields and ground potential variations. Figure 1 illustrates a typical application in which the Model 5612/5613 system might be utilized.

Figure 1: One Channel Depicted

Transmission of data on the signal fiber utilizes an FM modulation technique to allow for frequency response from 1 MHz all the way down to DC. A typical signal-to-noise ratio of 54 dB, guaranteed 48 dB, makes this link suitable for applications which require 8- or 9-bit digital resolution. Automatic Gain Control provides ease of operation by automatically compensating for fiber attenuation and other factors influencing the attenuation of the transmission media.

The Model 5612/5613 link system can typically be used with fibers up to 1 km in length. The specifications are applicable for any fiber which provides a minimum of 4 µW of optical power to the receiver and which has band width in excess of 15 MHz.

SPECIFICATIONS

Model 5612 ­p; Transmitter


ELECTRICAL

Input Characteristics: Front-panel input via triaxial Lemo connector with signal on center conductor and two grounds. Impedance 10 Mohm ±5%, shunted by less than 30 pF.

Full Scale Input: ±100, ±50, ±20, ±10, ±5, ±2, ±1, ±0.5, ±0.2 V. A range select switch is accessible on the rear -panel of the 5612. Full scale range is remotely programmable by front-panel switches on the 5613 or by CAMAC commands to the 5613 range switch.

Input Protection: Spark Gap, Zener and varistor protected.

Signal Input Connector: Front-panel Lemo, female size 3, triaxial. Mates with Lemo F3.650.NYLS/102 or LeCroy 402 001 650. Fits 0.36-0.4" OD cable such as Belden 9267. LeCroy cable assembly available as Part Number 480 200 301.

Fiber Optic Connectors: Two, Amphenol 906 ­p; one for signal transmission and one for remote control. To insure rated specifications Delrin short alignment sleeves should be used on all fiber optic cable connectors.

Power Switch: 3-position rear-panel switch selects transmitter internal power, power off, or external power input.

Local/Remote Control: Rear-panel slide switch. When set to Local, the transmitter operational status may be manually set at the transmitter. When set to Remote, the transmitter operational mode may be set by the manual controls on the front panel of the receiver module or by sending programming commands from the computer via the receiver module.

Range Switch: 16-position rotary switch. Used to set the input range or apply a calibration voltage. Active when the Local/Remote switch is in the Local position.

Power Consumption: 250 mA Transmitter ON, 200 µA Transmitter OFF. Battery: 12 V, 6 A/hr. gelled electro lyte rechargeable battery.

OPTICAL

Launch Power (after 30 m of fiber) for both signal and control fibers:

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MECHANICAL

Operating Temperature: 5°C to +50°C.

Weight: 9 lbs.

Height: 6 inches.

Width: 4 inches.

Depth: 8.25 inches.

Model 5613 ­p; Receiver


ELECTRICAL

Signal Output: A full scale signal at the input of the transmitter produces ±2 V into an open circuit or ±1 V into 50 ohm at the receiver output. A maximum output of ±5 V (20 mA) into high impedance ( 250 ohm) is available as option 5613/201, see Ordering Information. In addition, an output of ±10 V (10 mA) into loads of 1 kohm or higher is also available as option 5613/300. The front-panel output via a twin axial connector (Pin 1 signal, Pin 2 ground). The front-panel connector mates with Lemo FO.302.S/4.2 or LeCroy 402 051 000. Suitable for 0.15-0.165" OD cable such as Belden 88761. LeCroy cable assembly (for one channel) available as Part number 480 100 201.

Output Impedance: 50 ohm .

Power Consumption: 750 mA ±5% at +6 V, 110 mA at +24 V, 110 mA at -24 V.

OPTICAL

Fiber Optic Connectors: Four Amphenol 906 style connectors mounted at rear of module (2 for signal transmis sion and 2 for remote control, channel A and B respectively). To insure rated specifications Delrin short alignment sleeves should be used on all fiber optic cable connectors.

Optical Input Sensitivity: Typically 4 µW for rated specifications, for both signal and control fibers (10 µW guaranteed).

MECHANICAL

Front-panel Controls and Indicators: Two LED displays indicate the range setting of the two independent channels, A and B. Toggle switches are used to select ranges. Two LEDs indicate transmitter power-on or power -off. An on/off toggle switch is provided for each channel. Diagnostic LEDs indicate when the module is addressed and when its LAM output is asserted.

Packaging: In conformance with the international CAMAC standard (IEEE Report #583). RF-shielded CAMAC #2 module.

SYSTEM CHARACTERISTICS

DC Stability: < ±100 ppm/°C, Gain < ±75 µV/°C per week after 30 minute warm-up.

Bandwidth: DC to 1 MHz typical, 700 kHz guaranteed.

Flatness: < ±0.5 dB (DC to 400 kHz).

Transient Response: Rise and fall times < 500 nsec. Overshoot 5%.

DC Linearity: < ±1% deviation from straight line over the full output range.

AC Linearity: < ±3% deviation from straight line over the full output range.

Signal-to-Noise Ratio: 54 dB typical, 48 dB guaranteed.

Full Scale Accuracy: ±0.1% (±1 V input) after warm-up.

Calibration: Three internally generated reference voltages may be switched across the input of the transmitter. These voltages are +1.00 V, 0.00 V and -1.00 V. If the system gain is set correctly, then these voltages generate +1.00 V, 0.00 V and -1.00 V respectively at the output of the receiver when terminated with 50 ohm or typically +2.00 V, 0.00 V, and -2.00 V when unterminated. For 5613/201 these voltages are +5 V, 0 V, and -5 V into high impedance. For 5613/300 these voltages are +10 V, 0 V and -10 V into high impedance.

Battery Voltage Check: The transmitter can be instructed manually or via the controlling computer to connect its battery terminals to the signal input. An output of 1.5 V into high impedance or 0.8 V into 50 ohm indicates the battery is charged.

Manual/Computer Control: The full scale input range, calibration signal, battery test and the transmitter on/off status can be set by front-panel switches on the receiver module, or can be programmed via an IEEE 583 (CAMAC) interface.

ORDERING INFORMATION CHART

CAMAC COMMANDS

CAMAC COMMANDS

Z or C: Clears all registers, sets transmitters A and B to off, and their input ranges to ±100 V. Resets and disables Look-at-Me (LAM).

X: X = 1 (command accepted) response is generated when a valid F and A are present.

Q: Q = 1 is returned on an F(8)·A(0) if, and only if, the internal LAM is asserted.

LAM*: LAM line is asserted if it has been enabled with an F(26)·A(2) and the operational parameters of either link have been manually altered.

N: To be valid, all codes must be accompanied by the station number N.

CAMAC FUNCTION CODES

F(0)·A(0): Read Range and Mode of Transmitter A. See Table 1.

F(0)·A(1): Read Range and Mode of Transmitter B. See Table 1.

F(0)·A(2): Read Status. R1 and R2 True indicate that Transmitters 1 and 2 respectively, are ON. False indicates that the transmitters are OFF. R3 and R4 True indicate that channels A and B have been set manually.

F(6)·A(0): Read module identity on R1-R16. Decimal value decoded as 5613 or as set on internal 16-bit switches.

F(8)·A(0): Test LAM.

F(10)·A(0): Clear LAM.

F(16)·A(0): Write 4-bit Range Value for Channel A. See Table 1.

F(16)·A(1): Write 4-bit Range Value for Channel B. See Table 1.

F(24)·A(0): Disable Transmitter A.

F(24)·A(1): Disable Transmitter B.

F(24)·A(2): Disable LAM.

F(26)·A(0): Enable Transmitter A.

F(26)·A(1): Enable Transmitter B.

F(26)·A(2): Enable LAM.

*LAM ("Look-at-Me") is the equivalent of a "Service Request" or "Attention" signal.

Table 1 : Transmitter Setting Modes

Copyright© September 1995. LeCroy is a registered trademark of LeCroy Corporation. All rights reserved. Information in this publicaction supersedes all earlier versions.