Highland Technology V450
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Contents |
Overview
The V450 is a VME 16-channel isolated analog-to-digital converter module which can acquire a wide range of DC voltages, including thermocouple temperatures. Each channel is independent with an isolated DC power supply, optoisolated interface, A/D converter, signal conditioning, input protection circuits, and test relay.
An internal microprocessor manages all data I/O and communicates with the VME bus via a transparent, VMEbus-speed dual-port memory.
Each channel may be user programmed to operate in voltage-input or thermocouple acquisition mode. In each mode, channel operating parameters, acquired measurements, and status flags are accessible in dedicated VME registers. Data rate/filtering options are provided. Data acquisition is managed autonomously by the processor, so VME masters may set channel parameters or read acquired measurements at any time at full VMEbus speed. Any channel can be associated with any of the reference junction sensors located in the external field-wiring termination panels, or can use the on-board sensor. Cold-junction compensation is via table lookup of thermocouple potential for the type currently selected. Reference junction temperatures are readable.
Features
- 16 channels of fully isolated analog input acquisition, each independently programmable for mode and input range.
- Voltage mode: input ranges from ±25 mV to ±250 volts.
- Thermocouple mode: reports temperature for types J K E T R S B N.
- Includes four non-isolated precision RTD signal conditioners, plus one on-board temperature sensor.
- Reports thermocouple loop resistance and detects open thermocouples without inducing offset errors.
- 24-bit basic ADC resolution.
- No realtime handshaking required—once channel parameters are set up, measurements appear in dual-port memory registers with VMEbus-speed access.
- Supports one or two optional 8-channel J470 isothermal junction boxes, each with integral RTD reference junction sensor, or one or two J475 field-wiring interface boards.
- Test connector supports in-crate calibration check.
- Optional built-in self test (BIST).
- Clearly labeled dipswitches set VME address; no jumpers, headers, or trimpots.
Specifications
| FUNCTION | 16-channel isolated voltage/thermocouple input. |
| COMPLIANCE | IEEE 1014 VME; A16:A24:D16; no byte writes. Thermocouple tables based on NIST/ITS-90. RTD tables per IEC-751 for "385" curve RTDs. |
| PACKAGING | 6U single-wide VME module |
| DEVICE TYPE | 16-bit VME register-based slave: A24:A16:D16; implements 256 16-bit registers at switch-selectable addresses in the VME 16- or 24-bit addressing spaces. |
| CHANNEL INPUTS | 16 channels, programmable functions, galvanically isolated |
| RANGES | Programmable per channel. Voltage: 14 bipolar ranges, ±25 mV, 50 mV, 80 mV, 125 mV, 250 mV, 500 mV, 1.25V, 2.5V, 5V, 12.5V, 25V, 50V, 125V, 250 V. Thermocouples: types J K E T R S B N. |
| RESOLUTION | Voltage mode, 24 bits. Temperature mode, 0.0625 ºC. |
| OFFSET ERROR | Ranges < 1 volt: ±1 uV over time/temperature. Ranges >= 1 volt: ±20 PPM over time/temperature |
| GAIN ACCURACY | Ranges < 1 volt: ±100 PPM of range ±15 PPM/ºC. Ranges >=1 volt: ±250 PPM ±50 PPM/ºC. |
| SAMPLE RATE | Programmable per channel, 4 to 500 readings/second. |
| NOISE REJECTION | > 80dB rejection of 50/60 Hz noise at default sample rate of 16.7/second. |
| INPUT IMPEDANCE | 1G min on ranges below 1 volt. 1M min on ranges above 1 volt. |
| PROTECTION | ±350 volts differential. ±750 volts common-mode. ESD to 15KV, human body model. |
| RTD INPUTS | Four separate non-isolated external reference junction inputs, 4-wire platinum RTD sensor, 100 ohm or 1K, ISO "385" curve. Resolution 0.0625 ºC. Protected against shorts, ESD. |
| ONBOARD SENSOR | Semiconductor reference junction temperature sensor, ±2 ºC typ accuracy. |
| OPERATING TEMP | 0 to 60 ºC; extended MIL/COTS ranges available |
| CALIBRATION INTERVAL | One year |
| CONNECTORS | Two D-25 female, each 8 channels + 2 RTDs. One D9 male, test/calibration check. |
| INDICATORS | LEDs indicate VME access, CPU activity, error conditions. Additional LED flashes user programmable pattern. |
| POWER REQUIRED | VME +5 volts, 1 amp max. VME ± 12 volts, 10mA. |
Manuals, drivers, downloads & other resources
http://www.highlandtechnology.com/DSS/V450DS.html
See also
V470 VME ANALOG OUTPUT MODULE
Dealers, trainers, support, maintenance & service centers
Highland Technology, Inc.
United States
California
San Francisco
P: (415) 551-1700
F: (415) 551-5129
http://www.highlandtechnology.com
info@highlandtechnology.com
