GE DS3800HCPC1J1G

Technical Specifications

• Product Type: High-Current Pulse Counter Board (Revision 1J1G)

• Part Number: DS3800HCPC1J1G

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems (Rev. M and later)

• Input Channels: 8 independent pulse counter inputs

• Input Type: Differential or single-ended (jumper-selectable)

• Input Voltage: 5Vdc, 12Vdc, or 24Vdc (jumper-selectable)

• Input Current: Up to 50mA per channel

• Maximum Counting Frequency: 2 MHz – highest in series

• Counter Resolution: 32-bit (unsigned)

• Measurement Modes: Pulse counting, frequency, period, and quadrature encoder (jumper-selectable)

• Quadrature Decoding: 1x, 2x, or 4x (jumper-selectable)

• Accuracy: ±0.01% of reading

• Protection: Over-voltage (±60V), over-current, and reverse-polarity protection per input

• Diagnostics: Individual channel fault detection (over-voltage, over-current, signal loss, frequency out-of-range) with LED indication and backplane reporting

• Isolation: 2500Vrms reinforced isolation with enhanced common-mode transient immunity (> 100kV/µs)

• Temperature Range: -40°C to +85°C – widest in series

• MTBF: > 250,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Fastest Counting Speed: The GE DS3800HCPC1J1G supports up to 2 MHz pulse counting, ideal for high-speed encoders and speed pickups.

• Multiple Measurement Modes: Pulse counting, frequency, period, and quadrature encoder (1x, 2x, 4x).

• High-Resolution Counter: 32-bit for extended measurement ranges.

• Flexible Input Configuration: Jumper-selectable voltage (5/12/24V) and input type (differential/single-ended).

• Advanced Diagnostics: Fault detection (over-voltage, over-current, signal loss, out-of-range) with LED and backplane reporting.

• Reinforced Isolation: 2500Vrms with transient immunity (> 100kV/µs) for superior noise rejection.

• Widest Temperature Range: -40°C to +85°C suits extreme environments.

Typical Application Cases

• Turbine Speed Measurement: Counts pulses from magnetic or optical speed pickups.

• Flow Metering: Counts pulses from turbine flow meters.

• Encoder Positioning: Decodes quadrature encoder signals for actuator position feedback.

• Frequency Monitoring: Measures frequency of pulse signals for control applications.

Competitive Comparison

The GE DS3800HCPC1J1G is the highest-performance pulse counter in the Mark IV family.

Selection Guidelines & Precautions

1. Frequency Verification: Ensure input frequency does not exceed 2 MHz.

2. Input Type: Select differential for long cable runs (> 50m) or single-ended for short runs.

3. Input Voltage: Configure voltage (5V, 12V, or 24V) to match your pulse source.

4. Measurement Mode: Select appropriate mode (count, frequency, period, or quadrature).

5. Quadrature Decoding: Select 1x, 2x, or 4x for encoder applications.

6. Diagnostic Reporting: Requires Mark IV firmware Rev. M or later.

7. Wiring: Use shielded twisted-pair cables; ground shield at board end only.

8. ESD Handling: Use ESD-safe practices.

9. Sourcing: Obsolete. Request functional test report including all 8 channels tested at max frequency.

10. Spare Strategy: Keep one spare GE DS3800HCPC1J1G on-site for critical speed/flow applications. Proactive replacement after 10 years is recommended.