RESISTANCE SIMULATOR MODULE
Also available: V470 Analog Output Module
- Eight channel, isolated, wide-range, 2/4 wire resistance simulator.
- Fast, monotonic, glitch-free resistance value programming.
- Suitable for simulating resistors, platinum/copper RTDs, thermistors, strain gages, load cells.
- Users may directly program resistances or RTD simulation (copper or platinum) temperatures.
- Four programmable resistance ranges from 5 ohms to 65.5 Kohms.
- Any channel is switchable to front-panel calibration check connector for in-system test without disconnecting field wiring.
- Simple register based VME interface with no handshaking required.
- Optional built-in self-test (BIST) and mil/COTS versions available.
- Optional termination panels and bridge completion boards available.
The V420 is an 8-channel, isolated, programmable resistance simulator. It uses entirely solid-state simulation to eliminate transient errors associated with relay switching, and provide for monotonic resistance changes. Channels are individually programmable in four resistance ranges, from 5 ohms to 65.5K. Channels can operate from microvolts up to 35V / 50mA. Overload protection and channel error detection are included.
Any channel may be rerouted, under software control, to the front-panel calibration-check connector, allowing the board to be tested for calibration by a precision DVM without disturbing the connections to the equipment under test. The BIST option adds an onboard precision ohmmeter, allowing loopback checking and full automatic self-test. Optional external termination and bridge-completion boards are available.
Any channel may be rerouted, under software control, to the front-panel calibration-check connector, allowing the board to be tested for calibration by a precision DVM without disturbing the connections to the equipment under test. The BIST option adds an onboard precision ohmmeter, allowing loopback checking and full automatic self-test. Optional external termination and bridge-completion boards are available.
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| FUNCTION | 8-channel isolated resistance/RTD simulator |
| COMPLIANCE | IEEE 1014 VME; A16:A24:D16; no byte writes. Platinum RTD tables per IEC-751 for "385" curve RTDs. Platinum RTD tables per ITC-90 for "393" curve RTDs. |
| PACKAGING | 6U single-wide VME module |
| CHANNEL INPUTS | 8 channels, 2- or 4-wire resistance simulation, galvanically isolated |
| RANGES | Programmable per channel. 5 R - 500 R 50 R - 5000 R 500 R - 50 KR 5KR - 65KR -120 to +650 °C 100R/1K Pt385 RTD simulation -120 to +900 °C 100R/1K ITC-90 RTD simulation -100 to +400 °C 10R Copper RTD simulation |
| RESOLUTION | Resistance: Varies within each range: 15 bits at low end; 12 bits at high end. RTD: 0.0625°C resolution |
| ACCURACY | Resistance +-0.1% 4-wire, DC or AC to 1 KHz; 1% accurate to 20 KHz. Settles to 0.1% within 50 microseconds. RTD simulation is accurate to +-0.1 °C. Guaranteed monotonic within each range. Guaranteed glitch-free value changes within each range. DC offset error < 10 microvolts |
| TEMPERATURE COEFFICIENT |
Below 40 PPM/K; below 50 PPM/watt |
| MAXIMUM INPUT | Differential: +-50 mA, +-35 V Common Mode: +-750 V ESD to 15KV, human body model. |
| CONNECTORS | Two D-25 females, with four 4-wire channels each One D9 calibration check connector |
| INDICATORS | LEDs indicate VME access, CPU activity, error conditions; additional LED is user programmable. |
| OPERATING TEMP | 0 to 60 ºC; extended MIL/COTS ranges available |
| CALIBRATION INTERVAL | One year |
| VERSIONS | V420-1 0/60°C V420-2 0/60°C with BIST V420-3 -20/80°C MIL/COTS, coated, BIST |
| Also available: V470 Voltage/Thermocouple Output Module |
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