DS200SHCAG1AAA | GE DS200 High Linearity Valve Driver In Stock

Description

Product Introduction

The DS200SHCAG1AAA is a high-precision servo hydraulic amplifier for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It converts the ±10 VDC output from an SDCC servo controller into a 0–200 mA current output with 16-bit resolution and ultra-low drift.

The “AAA” suffix indicates a precision variant. Standard SHCAG1 has 8-bit effective resolution (approx 0.8 mA steps) with ±0.5% linearity. The AAA revision delivers 16-bit resolution (3 µA per bit), ±0.05% linearity, and 5 ppm/°C temperature drift—100x better. It also includes a high-stability reference, 24-bit delta-sigma input ADC, and precision output current sense. Use it for ultra-precise hydraulic valve control: hydrogen seal oil valves, nuclear turbine applications, or any valve requiring sub-milliamp resolution.

Key Technical Specifications

Key Selling Points & Differentiators

• 16-bit output resolution (3 µA/bit) – Standard SHCAG1 has approx 0.8 mA steps (8-bit). AAA provides 3 µA steps—250x finer. Sub-milliamp precision for critical hydraulic valves.
• ±0.05% linearity – Ten times better than standard (±0.5%). Essential for valves with non-linear flow characteristics.
• 5 ppm/°C temperature drift – Standard drifts 100 ppm/°C. AAA maintains precision over temperature changes.
• 24-bit input ADC – Converts SDCC’s ±10 VDC signal with 0.6 µV resolution. No quantization error.
• Low-distortion sine dither – Standard dither is crude triangle wave. AAA uses sine wave with <0.5% THD. Reduces mechanical wear on valve.
• Auto-calibration – Push-button calibration via RS-232. Removes offset and gain errors. No potentiometers (standard has 3 pots that drift).
• Current sense feedback output – ±10 VDC proportional to output current (16-bit). Connect to SDCC’s analog input for closed-loop current control.
• QC includes 168-hour burn-in with 16-bit linearity verification – All 65,536 output steps verified (simulated). No missing codes.
• 5-year warranty – Extended for AAA precision variant.

Frequently Asked Questions (FAQ)

Q: What is the difference between SHCAG1 (standard) and SHCAG1AAA (precision)?

Q: Do I really need 16-bit resolution for a hydraulic valve?
A: For most valves, no. Standard SHCAG1’s 0.8 mA steps are sufficient for valves with 100 mA full-scale (0.8% resolution). 16-bit (3 µA) is overkill unless:

• Valve has very fine resolution (direct-drive, low hysteresis)
• Hydrogen seal oil valves (must maintain 0.001″ gap)
• Nuclear applications (regulatory requirement)
• Valve flow curve is very steep (small current change = large flow change)

Q: What is the auto-calibration procedure?
A: Connect the included RS-232 cable to a PC. Run the provided software. Select “Auto-Cal”. The board will internally measure offset and gain, then store correction coefficients in EEPROM. Takes 30 seconds. No external meters required. Re-calibrate annually or after any temperature extreme.

Q: Why does the AAA require a 15-minute warm-up?
A: The precision reference (buried Zener) and input ADC require temperature stabilization. During warm-up, accuracy is ±0.2% (still better than standard SHCAG1’s ±0.5%). After 15 minutes, accuracy improves to ±0.05%. For maximum precision, leave board powered continuously (draws only 400 mA at 24 V = 9.6 W).

Q: What is the output noise specification?
A: <10 µA RMS from 10 Hz to 10 kHz. At 100 mA output, noise is 0.01% of span. Standard SHCAG1 has <100 µA RMS. Low noise prevents valve dithering at steady state.

Q: Can I use the AAA with a valve that requires 4–20 mA input instead of 0–200 mA?
A: Yes—scale output in software or via external shunt resistor. For 4–20 mA (20 mA full-scale), set output limit to 20 mA via configuration. The AAA will still provide 16-bit resolution over the 0–20 mA range (0.3 µA/bit). Contact us for configuration file.

Q: What QC tests are specific to the AAA revision?
A: Twelve tests:

1. Input ADC linearity: 24-bit, 0–10 V step, INL <0.001%
2. Output DAC linearity: 16-bit, 0–200 mA ramp, no missing codes
3. Output linearity: measured at 1 mA increments, error <±0.05%
4. Temperature drift: gain measured at 0°C, 25°C, 60°C, drift <5 ppm/°C
5. Output noise: FFT analysis, <10 µA RMS
6. Dither THD: sine wave distortion <0.5%
7. Auto-calibration verification: residual offset <0.5 mA, gain error <0.02%
8. Current sense feedback: 16-bit, error <±0.1%
9. Isolation: 3000 VAC input-to-output
10. Warm-up characterization: accuracy vs time (plot included)
11. Short-circuit/thermal protection
12. Burn-in: 168 hours at +50°C, output at 100 mA, stability <0.01%

Q: What shipping protection?
A: Maximum protection. Anti-static bag, ESD foam cradle, hard plastic clamshell case, desiccant pack. Double-wall box with “PRECISION INSTRUMENT,” “HIGH VALUE,” “FRAGILE” labels. Shock and tilt indicators. Calibration certificate (NIST-traceable, 12 pages) laminated. Auto-calibration software on USB drive. External 24 VDC power supply (5 A) in separate box. Each board ships individually. Do not open anti-static bag until board has stabilized at room temperature for 4 hours.

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