P620 6-channel isolated resistance simulator

Isolated Resistance Simulator - P620
  • 6 channels of fully isolated precision resistance/RTD simulation
  • True 4-wire resistance simulation on all channels
  • Resistance programmable from 5Ω to 5MΩ in five ranges
  • Programmable for 100Ω and 1kΩ platinum RTDs
  • RTD mode accepts temperatures directly in Celsius
  • Monotonic resistance changes allow for RTD simulation without transient errors
  • Channels may be used in series or parallel for additional voltage and current capability
  • Separate TEST port allows access to channels for in-system calibration check
  • 4 versatile digital input/outputs
  • Built-in self-test (BIST)
  • Ethernet and USB interfaces
  • Access via serial ASCII commands or web interface
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The P620 is a standalone 6-channel RTD and resistance simulator. It is intended for system-level testing of process control systems, FADEC engine controllers, and other critical systems.

Each independent, isolated channel can simulate common RTD types and six decades of resistance range. It uses entirely solid-state simulation to eliminate transient errors associated with relay switching, and provides for monotonic resistance changes. Channels can operate from millivolts up to 10V and 20mA. 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 built-in self test provides an onboard ohmmeter, allowing loopback checking and fully automatic self-test.

Both USB and Ethernet interfaces are provided. Control is via text commands or through the internal web page server. Only a web browser is needed to exercise all P620 functions, but the simple ASCII command set facilitates integration into user programs.

Four versatile digital I/O ports are provided, each CMOS/TTL compatible and capable of driving relays or LEDs.

FUNCTION 6-channel isolated resistance simulator
RESISTANCE SIMULATION RANGES Standard resistance ranges:
R5 5Ω to 500Ω
R50 50Ω to 5kΩ
R500 500Ω to 50kΩ
R5K 5kΩ to 500kΩ
R50K 50kΩ to 5MΩ
Platinum RTD types:
R385 -125°C to 700°C 100Ω Pt 385
K385 -125°C to 700°C 1kΩ Pt 385
R392 -125°C to 950°C 100Ω Pt 392
K392 -125°C to 950°C 1kΩ Pt 392
OUTPUT RESOLUTION Standard resistance ranges: Variable from 9-15 bits with higher resolution at the lower end of the range (see manual section 6.1 for details)
RTD ranges: Better than 0.05°C
INPUT OPERATING RANGE ±10 V differential, ±20 mA
OUTPUT PROTECTION ±30 V differential
±750 V common-mode
ESD to 5 kV, human body model
DIGITAL INPUT/OUTPUT 4 DIO channels, TTL/CMOS compatible
Outputs can sink up to 32 volts at 250 mA
Direct LED drive
CONNECTORS D25 female for 6 channels
D9 male for test
D9 female for DIO
1 securable power barrel connector
INDICATORS LEDs indicate Ethernet/Serial access, CPU activity, error conditions
Additional user programmable LED
POWER 24 volts DC, 500mA max
2.1 x 5.5 mm barrel connector, center pin positive
External supply included
Resistance Output Accuracy
100Ω1, 1kΩ2 RTD,-125°C to 250°C3 ±0.05°C ±0.25°C ±0.7°C
Resistance,1x to 20x of base resistance4 ±0.1% ±0.4% R5 - R5K: ±1.25%
R50K: ±4%
11mA minimum test current
2100µA minimum test current
3Simulated RTD Temperature
410mV minimum test voltage
5P620 ambient temperature
For a more in-depth discussion of accuracy, see manual section 6.

PDF Block Diagram: P620 6-channel isolated resistance simulator

PDF Datasheet: P620 6-channel isolated resistance simulator

PDF Manual: P620 6-channel isolated resistance simulator

P620-1: 6-channel isolated resistance simulator

J24: 24 volt 1.2 amp power supply

J27: 2.1 x 5.5 mm barrel to pigtail power cable

J55: 6′ shielded D25 male to D25 male cable

J56: 10′ shielded D25 male to D25 male cable

J75-1: D9 female to two(2) dual banana plug cable

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

P51: mounting flange