GE DS3800XTFS

Key Parameters

Temperature Simulation Section:

• Function: Thermocouple and RTD signal simulation

• Simulated Thermocouple Types: J, K, T, E, R, S, B, N (software-selectable)

• RTD Simulation: Pt100, Ni100 (resistance values programmable)

• Output Channels: 4 independent simulator channels

• Signal Accuracy: ±0.02% of simulated value

• Cold-Junction Compensation Simulation: Programmable reference temperature

• Diagnostics: LED status per channel, output monitoring

Frequency Simulation Section:

• Function: Frequency/pulse signal generation for testing counter inputs

• Output Channels: 2 independent generator channels

• Frequency Range: 0.1 Hz to 500 kHz (programmable)

• Output Types: TTL, open-collector, or differential (jumper-selectable)

• Accuracy: ±0.01% of set frequency

• Waveform: Square wave (programmable duty cycle)

• Diagnostics: LED status per channel

Common Section:

• Isolation: 2500V RMS output-to-backplane (enhanced)

• Temp Range: –40°C to +85°C (extended)

• Power Supply: +5V, ±15V from VME backplane

• Physical: 6U VME single-slot board

• Key Features: 4 TC/RTD simulator outputs + 2 frequency generator outputs, high accuracy, programmable, self-test, 2500V isolation

Advantages

• Multi-function test capability – the DS3800XTFS combines temperature simulation and frequency generation in a single slot, providing a complete test solution for temperature and speed/flow measurement systems.

• High-accuracy simulation – ±0.02% temperature simulation and ±0.01% frequency generation ensure reliable verification of measurement accuracy.

• Wide frequency range – generates signals from 0.1 Hz to 500 kHz, covering slow-speed to high-speed turbine applications.

• Programmable cold-junction reference – the General Electric DS3800XTFS allows programming of reference temperatures for thermocouple simulation.

• Multiple output types – supports TTL, open-collector, and differential outputs for frequency simulation, accommodating various input requirements.

• Enhanced isolation – 2500V RMS isolation protects the backplane from test equipment or accidental faults.

• Extended temperature range – operates from –40°C to +85°C for harsh environments.

• Self-test on power-up – verifies simulator functionality during system startup.

• Drop-in compatible – works with all Mark IV backplanes and processor configurations.

Applications

• Temperature channel validation – verifies that thermocouple and RTD input channels (e.g., on DS3800XTBA boards) are reading accurately using the DS3800XTFS simulation outputs.

• Frequency channel validation – tests counter/frequency input boards (e.g., DS3800XCIA series) by generating precise frequency signals.

• Loop testing – simulates sensor signals to test the entire measurement loop from the input board to the turbine control logic.

• Commissioning – used during turbine commissioning to verify proper temperature sensor wiring and frequency sensor scaling.

• Troubleshooting – isolates measurement issues by ruling out sensor or wiring problems.

• Offshore and harsh environments – extended temperature range makes it suitable for demanding applications.

vs Competitors & Separate Test Equipment

Selection Tips

• Combined test needs – choose the DS3800XTFS if your facility needs both temperature and frequency signal simulation capabilities in a single, integrated board.

• Time savings – the General Electric DS3800XTFS can significantly reduce testing time compared to using separate external instruments.

• Slot-limited installations – ideal for compact systems where a single test board is preferred over multiple external instruments.

• High-frequency applications – the 500 kHz frequency generation capability is suitable for testing high-speed turbine pickups and encoders.

• Sensor compatibility – verify that the thermocouple/RTD types and frequency input requirements in your facility are supported by the DS3800XTFS.

• Spare strategy – keep one DS3800XTFS per facility (or per 5–8 installed measurement boards) for maintenance and troubleshooting.

• Calibration – the DS3800XTFS itself should be periodically verified against traceable references.

Critical Precautions

• Simulation output connection – disconnect the field sensor before connecting the DS3800XTFS output to an input channel to avoid damaging the sensor or simulator.

• Voltage limits – do not apply external voltages to the General Electric DS3800XTFS outputs; this can damage the output stages.

• Wiring polarity – observe correct polarity when connecting the DS3800XTFS simulator outputs to input boards; reversed polarity produces inverted readings.

• Cold-junction simulation – when simulating thermocouple signals, ensure the programmed reference temperature matches the actual terminal block temperature of the input board, or use the input board’s CJC.

• Frequency output load – ensure the connected input has the correct impedance and termination for the DS3800XTFS output type (TTL, open-collector, differential).

• Shielded cabling – use shielded cables for simulation connections to minimize noise pickup. Ground the shield only at the DS3800XTFS end to prevent ground loops.

• Ground loops – ensure proper grounding when connecting the DS3800XTFS to multiple input channels to avoid ground-loop currents.

• Self-test – allow the DS3800XTFS to complete its power-up self-test (~2 seconds) before relying on simulation outputs.

• Calibration intervals – schedule periodic calibration verification of the DS3800XTFS itself (every 12–18 months) against traceable references.

• Hot-swap – never insert or remove the DS3800XTFS while the rack is powered; this can cause signal glitches or damage.

• ESD handling – always use a grounded wrist strap when handling the DS3800XTFS; precision DACs and signal conditioning components are ESD-sensitive.

• Storage – store spare DS3800XTFS boards in anti-static bags in a dry, temperature-controlled environment.