Click model number for photo

1450 Modular High Voltage System

FLEXIBLE HIGH VOLTAGE SYSTEM FOR PMTs, WIRE CHAMBERS AND SILICON STRIP DETECTORS


The LeCroy Model 1450 Modular High Voltage System, known as VISyN (Voltage & Current System on Network), represents the state-of-the-art in performance and ease-of-use in high voltage generation. It also offers a lower cost per channel than other commercial or laboratory designed high voltage products.

The 1450 VISyN system includes two different mainframes, a portable HV crate and a large and diverse line of compatible HV cards. These HV cards span the voltage and current ranges that satisfy most detectors used in High Energy, Nuclear and Heavy Ion Physics. The open ended system and modular architecture allow effec tive future expansion.

FUNCTIONAL DESCRIPTION

The LeCroy 1450 VISyN system represents the next generation in high voltage instrumentation. This system is designed to meet the demanding requirements of new experiments:
This system represents a dramatic improvement over previous commercial and laboratory designs. The 1450 VISyN system includes combinations of mainframes and HV cards. The mainframes supply space, power and control for the HV cards. The 1451 HV crate relies on an external computer to provide control. The HV cards supply the actual high voltage output. All the specifications for the high voltage output (accuracy, range, current, polarity) are determined by the selected HV card. All HV cards operate in all mainframes and HV crates.

MAINFRAMES/CRATES

The Model 1451 HV Crate is designed for small channel count or portable applications. It contains 2 slots for HV cards and weighs less than 20 pounds fully loaded with 24 channels of PMT high voltage. The 1451 is exclusively controlled via a serial connection to a (user-supplied) IBM-compatible PC running the provided (DOS) control program, HV51.

The Model 1454 Mainframe addresses medium to low channel count requirements. The mainframe supplies four slots for HV cards and a front panel user interface. Four slots accept 48 channels of the Model 1461 HV card. The front panel user interface consists of a back- lit 320 x 200 pixel LCD display and custom keypad. This interface controls the HV cards inserted in the 1454. The 1454 may be remotely controlled via RS-232 or a local area network.

The Model 1458 Mainframe addresses the high channel count application. This mainframe supplies sixteen (16) slots for HV cards, but no keypad or LCD display. All control is via RS-232 or a local area network. The 1458 supports 192 channels of the 1461 HV card in 14 inches of vertical rack space.

COMMUNICATION FEATURES

VISyN has three major user interface systems for communications. The most visible is the front panel display and keypad (Model 1454 only). This interface provides complete control over all channels in the mainframe. The LCD display shows which HV cards are in the mainframe, the settings for these cards, and the measurements made by the HV cards. With the keypad, all settings for the HV cards can be programmed.

Both of the mainframes (1454 and 1458) provide an RS-232 interface, allowing the use of a standard terminal for control and display. This interface provides the same capabilities as the front panel display in a text command format or full screen format (VT100 compatible). The front panel and RS-232 interfaces are always available for reviewing information in the mainframe, but changes can be locked out remotely or via a front panel key switch.

Lastly, VISyN mainframes can be controlled over a local area network (LAN) via ARCNET, a proven industrial standard. ARCNET is a high speed (2.5 Mbaud) token-passing network protocol. The standard implementation of ARCNET is readily available and inexpensive for many types of host systems, including VME. Large distances (4 miles) can be covered; the token -passing system is deterministic; in heavy traffic, throughput does not decrease.

RELIABILITY

VISyN is designed for high reliability, serviceability and long operating life. Wherever possible, the use of batter ies, lamps, and other limited life components are avoided. Major sections of the mainframe are modular and easily replaced. High voltage circuits are potted and insulated for safety and for protection against the accumula tion of dirt.

HV SUPPLY CARDS

Each of the various HV cards is a complete HV subsystem. The HV card includes its own ADCs, DACs, refer ences and interface circuitry. The interface to the mainframe is completely digital and very flexible. All information about ranges, resolution, limits, etc., is stored in the HV card. New 1460 series HV cards with different features can be inserted into older 1450 systems with no loss in performance.

Depending on load and voltage, the HV card can require more supply current than available in the average HV mainframe slot. The user must confirm that sufficient supply current is available for their application. The required information is in the data sheets for the HV cards and HV mainframes.

Model 1461 3 kV Independent HV Supply

The Model 1461 HV card supplies 12 independent channels, in a single slot, suitable for photomultiplier tubes. The high voltage output is programmable from 0 to 3 kV, and output current limit supports a 1.2 M W load to 3 kV. Other features include voltage measurement, current measurement, programmable current trip, hardware voltage limit (once per card), and separate program mable ramp up and ramp down rates.

Model 1469 3.5 kV Distributed HV Supply


The Model 1469 HV Card is ideal for chamber applications. The card supplies 24 channels of high voltage, programmable in groups of 8 channels. All channels within a group are programmed to the same output voltage, in steps of 1 V, from 0 to 3.5 kV with channel-to-channel variation within each group nominally less than 500 mV. Each channel provides current readback and current trip resolution of 25 nA and a maximum output current of 100 µA.

Features include 12-bit voltage readback for each group, current trip for each channel, programmable ramp up rate, and programmable ramp down rate. In the event of a trip, a relay disconnects the output. Other outputs within the group remain powered.

SPECIFICATIONS

Model 1451 HV Crate

Dimensions: 12" high x 6.30" wide x 16.25" deep.
Capacity: Two vertical HV card slots.
Output Power (available to HV cards from 24 V supply): 192 W (8 A at 24 V).
Airflow: Rear to front.
Power: Auto selecting, 90 to 130 VAC or 180 to 260 VAC; 50 - 60 Hz.
Remote Communications: Serial port, RS232C.
Display: None.
Operating Temperature: 0°C to 40°C.
Ambient Humidity: 0 - 90% relative humidity, non-condensing.
Control Software: 1450-SW included.

Model 1454 HV Mainframe

Dimensions: 4 U (7") high x 19" wide x 24" deep.
Capacity: 4 horizontal HV card slots.
Output Power (available to HV cards from 24 V supply): 360 W (15 A at 24 V).
Airflow: Front to rear.
Power: 90 V to 260 VAC; 50 to 60 Hz; power factor corrected.
Remote Communications: Local Area Network (LAN) ARCNET Standard; Ethernet is an option in development; Serial Port: RS232C.
Display: Back-lit 320 x 200 pixel LCD display.
Operating Temperature: 5°C to 40°C.
Ambient Humidity: 0 - 90% relative humidity, non-condensing.

Model 1458 and 1458HP High Density HV Mainframes

Dimensions: 8 U (14") high x 19" wide x 26" deep.
Capacity: 16 vertical HV card slots.
Output Power (available to HV cards from 24 V supply): Model 1458: 1440 W (60 A at 24 V); Model 1458HP: 2160 W (90 A at 24 V).
Airflow: Front to rear; vertical option.
Power: 90 V to 260 VAC; 50 to 60 Hz; power factor corrected, > 220 VAC required for full power output.
Remote Communications: Local Area Network (LAN) ARCNET Standard; (Ethernet is an option in develop ment; Serial Port: RS232C.
Display: None; LCD display option.
Operating Temperature: 0°C to 40°C.
Ambient Humidity: 0 - 90% relative humidity, non-condensing.

Model 1461 Independent 12-Channel, 3 kV Card

Channels: 12, fully independent.
Voltage: Programmable 0 to 3 kV.
Voltage Polarity: Model 1461N for negative voltage, Model 1461P for positive voltage.
Voltage Set Resolution: < 1 V (nominally 750 mV).
Voltage Output Accuracy: ±(0.1% of setting + 1.5 V) at 25°C, from 5 to 100% of full scale (Below 5% of full scale, a minimum load may be necessary.)
Temperature Stability: < 100 ppm/°C.
Voltage Repeatability: < ±0.5 V at constant load, line and temperature.
Voltage Output Ripple: < 100 mV p-p max (< 50 mV p-p for < 1 mA).
Voltage Measurement Resolution: < 1 V (nominally 750 mV).
Voltage Measurement Accuracy: ±(0.1% of reading + 1.5 V) at 25°C.
Voltage Ramp Rate: Programmable per channel, separate ramp up and ramp down rates (nominally 50 to 2,000 V per second in 50 V increments).
Current: 2.5 mA from 2.8 kV to 3 kV, derate 0.83 mA/kV from 2.8 kV down to 1.0 kV, > 1 mA from 0 to 1 kV; supports 1.2 M W load to 3 kV. (See Power Requirements.)
Current Trip: Programmable per channel, < 1 µA resolution. (Settable from 50 µA up to
2.550 mA.)
Current Measurement Resolution: < 1 µA.
Current Measurement Accuracy: +(2% of reading + 15 µA).
Power Requirements (current from 24 V supply): (38 mA + 171 mA/output mA) per channel. Note, this can exceed the power supplied by a standard mainframe.
Hardware Voltage Limit: One potentiometer on panel and 1000:1 test point.
HV On LED: One per card, flash for any changing output, Steady on for any stable HV.
Dimensions: 6 U (10.3" high x 14.6" long x 1" wide; Eurocard C size).
Connector Type: SHV.

Model 1462 - Preliminary Independent 6-Channel, 3 kV Card

Channels: 6, fully independent.
Output Voltage: 0 to 3 kV, programmable.
Voltage Polarity: Model 1462N for negative voltage, Model 1462P for positive voltage.
Voltage Set Resolution: < 1 V (750 mV nominal).
Voltage Measurement Resolution: < 1 V (750 mV nominal).
Voltage Measurement Accuracy: ±(0.1% + 1.5 V) at 25°C.
Voltage Output Accuracy: ±(0.10% + 1.5 V) at 25°C, from 5% to 100% of full scale (below 5% of full scale a minimum load is required).
Voltage Output Temperature Stability: < 100 ppm/°C.
Voltage Repeatability: < ±0.5 V at constant load, line and temperature.
Voltage Output Ripple: < 100 mV p-p; < 50 mV p-p for output current < 1 mA.
Voltage Ramp Rate: Programmable per channel, separate ramp up and ramp down rates, nominally 50 to 1,000 V per second in 50 V steps.
Output Current Capability: > 4.0 mA from 2.8 kV to 3 kV, > 1.6 mA from 0 to 1.0 kV, linear derate from 1.0 kV to 2.8 kV, (see Power Requirements).
Current Trip: Programmable per channel, < 1 µA resolution; programmable from 50 µA to
5050 µA.
Current Measurement Resolution: < 1 µA.
Current Measurement Accuracy: ±(2% + 15 µA).
Power Requirements (current from 24 V supply): (76 mA + 171 mA/output mA) per channel. Note, this can exceed the power supplied by a standard mainframe.
Hardware Voltage Limit: One potentiometer on panel and 1000:1 test point.
HV On LED: One; on if any channel generates output.
Connector Type: SHV.
Dimensions: 6U (10.3" high x 14.6" deep x 1" wide; Eurocard C size).

Model 1468 Independent 6-Channel, 6 kV Card

Channels: 6, fully independent.
Output Voltage: Programmable 0 to 6 kV.
Voltage Polarity: Model 1468N for negative voltage, Model 1468P for positive voltage.
Voltage Set Resolution: < 1 V (0.5 V nominal).
Voltage Output Accuracy: ±(0.10% of setting + 3 V) at 25°C, from 5 to 100% of full scale (below 5% of full scale, a minimum load is required).
Voltage Output Temperature Stability: < 100 ppm/°C.
Voltage Repeatability: < ±1 V at constant load, line and temperature.
Voltage Output Ripple: < 200 mV p-p.
Voltage Measurement Resolution: < 2 V (1.5 V nominal).
Voltage Measurement Accuracy: ±(0.1% of reading + 3 V) at 25°C.
Voltage Ramp Rate: Programmable per channel, separate ramp up and ramp down rates (nominally 100 to 4000 V per second in 100 V steps).
Current: Maximum 500 µA per channel.
Current Trip: Programmable per channel, < 1 µA resolution. (Programmable from 50 µA to
500 µA.)
Current Measurement Resolution: < 1 µA.
Current Measurement Accuracy: ±(2% of reading + 15 µA).
Power Requirements (current from 24 V supply): (56 mA + 330 mA/output mA) per channel. Note, this can exceed the power supplied by a standard mainframe.
Hardware Voltage Limit: One potentiometer on panel and 2000:1 test point.
HV On LED: One per card, flash for any changing output, steady on for any stable HV.
Dimensions: 6 U (10.3" high x 14.6" deep x 1" wide; Eurocard C size).
Connector Type: SHV (6) and 96-pin DIN.

Model 1469 24-Channel, 3.5 kV Supply/Distributor Card

Channels: 24, programmable in groups of 8.
Voltage: Three programmable groups of 8 channels; 0 to 3.5 kV in 1 V steps.
Voltage Polarity: Model 1469N for negative voltage, Model 1469P for positive voltage.
Voltage Set Resolution: < 1 V.
Voltage Output Accuracy: ±(0.1 % of setting +1.5 V) at 25°C.
Voltage Output Matching: < 500 mV voltage difference within 8 channel groups.
Temperature Stability: < 100 ppm/°C.
Voltage Repeatability: < ±0.5 V at constant load, line and temperature.
Voltage Output Ripple: < 50 mV p-p.
Voltage Measurement Resolution: < 1 V (only on source channels).
Voltage Measurement Accuracy: ±(0.1% of reading + 1.5 V) at 25°C.
Voltage Ramp Rate: Programmable per group, 1 V/sec to 500 V/sec in 1 V/sec steps. Separate ramp up and ramp down rates.
Current: Maximum 100 µA per channel.
Current Trip: Programmable per channel, 25 nA steps.
Current Measurement Resolution: 25 nA.
Current Measurement Accuracy: ±(1% of reading + 100 nA).
Connector Type: Three 8 HV channel multiconductor, block type.
Power Requirements (current from 24 V supply): To be determined.
Dimensions: 6 U (10.3" high x 14.6" long x 1" wide; Eurocard C size).

Model 1450-SW Control/Simulation Software


Computer System Requirements: IBM PC compatibles with 80386 or higher performance processor, 3.5" high density floppy drive, MS DOS version 6.0 or later.

High Voltage Card Comparison Matrix


VISyN is a trademark of LeCroy Corporation.

ARCNET is a registered trademark of Datapoint Corporation.

Copyright© February 1996. LeCroy is a registered trademark of LeCroy Corporation. All rights reserved. Information in this publicaction supersedes all earlier versions.