V420 8-channel VME isolated resistance simulator
- 8-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
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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.
| FUNCTION | 8-channel VME isolated resistance simulator |
| 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 |
| CHANNELS | 8, 2-wire or 4-wire, galvanically isolated |
| RANGES | Resistance ranges: 5 Ω to 500 Ω 50 Ω to 5 kΩ 500 Ω to 50 kΩ 5 kΩ to 65 kΩ Platinum RTD ranges: -125°C to 700°C 100 Ω Pt385 (α = .00385) -125°C to 700°C 1 kΩ Pt385 (α = .00385) -125°C to 950°C 100 Ω ITC-90 (α = .00393) -125°C to 950°C 1 kΩ ITC-90 (α = .00393) -125°C to 950°C 500Ω ITC-90 (α = .00393) Copper RTD ranges: -100°C to 260°C 10 Ω (α = .00427) |
| OPERATING RANGE | ±35 V differential, ±50 mA DC or peak AC per channel |
| PROTECTION | ±50 V differential ±750 V common-mode ESD to 5 kV, human body model |
| RESOLUTION | Resistance ranges: Variable from 12-15 bits with higher resolution at the lower end of the range RTD ranges: 0.0625°C |
| ACCURACY | ±0.1% typical (±1% max) of resistance setting ±0.25°C on RTD ranges DC offset error < 10 µV |
| NON-LINEARITY | ±5 ppm/V ±25 ppm/W |
| TEMPERATURE COEFFICIENT | ±20 ppm/°C |
| RESISTOR BANDWIDTH | 50 kHz |
| OPERATING TEMPERATURE | 0 to 60°C; extended MIL/COTS ranges available |
| CALIBRATION INTERVAL | 1 year |
| POWER | Standard VME supplies: +5 V, 1 A max +12 V, 1 A max -12 V, 1 A max |
| CONNECTORS | 2 D25 female for channels D9 male for test |
| INDICATORS | LEDs indicate VME access, CPU activity, error conditions Additional user programmable LED |
| PACKAGING | 6U single-wide VME module |
| CONFORMANCE | ANSI/VITA 1-1994 (R2002) VMEbus spec; does not support byte writes IEC-751 for "385" curve platinum RTDs ITC-90 for "393" curve platinum RTDs |
V420-1: 8-channel VME isolated resistance simulator 0° to 60°C
V420-2: 8-channel VME isolated resistance simulator 0° to 60°C with BIST
V420-3: 8-channel VME isolated resistance simulator 20° to 80°C MIL/COTS, coated, with BIST