DS3800HFXE | Mark V Speedtronic High-Resolution Output Card

Description

Product Introduction

The DS3800HFXE is the flagship of GE’s pulse output family—it offers 16-bit frequency resolution, providing the finest frequency control available on the Mark V platform. This board is designed for applications that demand the highest precision: calibration labs, sensor testing, and advanced control algorithms that require ultra-fine frequency adjustment. The 16-bit resolution allows frequency settings with 0.00015Hz precision at 10kHz, making it suitable for the most demanding test and measurement applications. The board’s 0-10kHz frequency range covers the typical speed range of 60Hz turbines (up to 7.2kHz for a 120-tooth gear), and the 24V DC outputs match modern speed sensors.

We’ve used the HFXE in a calibration lab to verify the accuracy of turbine speed sensors. The 16-bit resolution allowed us to set frequencies with 0.0002Hz precision, enabling us to measure sensor accuracy down to 0.01%. The board’s frequency accuracy of ±0.02% of setting ensured that the test signal was more accurate than the sensors being tested. The HFXE is the board to choose when precision matters most.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the 16-bit resolution on the HFXE?
A: The 16-bit resolution provides the finest frequency control available on the Mark V platform—65536 steps compared to 4096 steps (12-bit) or 16384 steps (14-bit). This allows you to set frequencies with ultra-fine precision, which is essential for calibration applications and precision control algorithms. At 10kHz, a 16-bit board has a step size of about 0.15Hz—far finer than the 0.6Hz of a 14-bit board or the 2.4Hz of a 12-bit board. The frequency accuracy improves to ±0.02% of setting.

Q: Can I use the HFXE to calibrate speed sensors?
A: Yes, the HFXE is ideal for speed sensor calibration. The 16-bit resolution and ±0.02% accuracy allow you to generate frequency signals that are more accurate than most speed sensors, enabling you to verify sensor accuracy and calibrate them. The 24V DC output matches the voltage of modern speed sensors.

Q: What’s the frequency range of the HFXE?
A: The HFXE generates frequencies from 0Hz to 10kHz. This covers the typical speed range of 60Hz turbines (up to 7.2kHz for a 120-tooth gear). If you need higher frequencies (up to 100kHz), consider the HFXC (12-bit) or other variants. The HFXE is optimized for precision, not high frequency.

Q: How do I program the frequency on the HFXE?
A: The frequency is set by the Mark V controller. The controller sends a 16-bit frequency value to the HFXE via the backplane, and the board generates the corresponding pulse output. The specific register mapping is in GE’s application manual (GEI-100877). You’ll need to configure the Mark V to output the appropriate frequency values.

Q: The HFXE has a 1.0A backplane current draw. Is that higher than other frequency output boards?
A: Yes, the HFXE draws 1.0A, which is higher than the HFXC (0.9A) and HFXB (0.8A). The extra current is for the 16-bit resolution and the precision output stage. If your rack is near the power supply limit, this could be significant. The Mark V power supply is typically rated at 6A on the 5V rail. If you have multiple HFXE boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

Q: Does the HFXE have conformal coating?
A: Not by default. The HFXE’s suffix typically indicates termination type, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HFXE1G1G). The standard HFXE is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: Can I use the HFXE to drive a 24V DC load?
A: Yes, the HFXE’s MOSFET outputs can drive 24V DC loads up to 0.5A per channel. However, the board is intended for precision pulse generation, not static on/off control. If you need to switch a load on and off, a discrete output board like the HEDB is more appropriate. The HFXE is for applications where the frequency is precisely controlled.

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