V420 8-channel VME isolated resistance simulator

Resistance Simulator - V420
  • 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 Standard resistance ranges:
5 Ω to 500 Ω
50 Ω to 5 kΩ
500 Ω to 50 kΩ
5 kΩ to 65 kΩ
Extended resistance ranges:
5 kΩ to 1 MΩ
Platinum RTD ranges:
-125°C to 700°C 100 Ω Pt385 (α = .00385)
-125°C to 700°C 1 kΩ Pt385 (α = .00385)
-120°C to 950°C 100 Ω ITS-90 (α = .00393)
-120°C to 950°C 1 kΩ ITS-90 (α = .00393)
-120°C to 950°C 500Ω ITS-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 Standard 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
±25 ppm/W
OPERATING TEMPERATURE 0 to 60°C; extended MIL/COTS ranges available
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
ITS-90 for "393" curve platinum RTDs

PDF Block Diagram: V420 isolated resistance simulator

PDF Datasheet: V420 isolated resistance simulator

PDF Manual: V420 isolated resistance simulator

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 with BIST and conformal coating

J55: 6' shielded D25 male to D25 male cable

J56: 10' shielded D25 male to D25 male cable

J475-1: 8-channel D25 female Din rail termination panel