DS3800HFXE1D1C | 8-Channel 16-Bit Frequency Output Board

Description

Product Introduction

The DS3800HFXE1D1C is the 16-bit precision pulse output board with the 1D locking terminals and 1C mixed fusing (2.5A on Bank 1, 1A on Bank 2). This board provides the highest frequency resolution available on the Mark V platform—0.15Hz step size at 10kHz—combined with the vibration-resistant locking terminals we’ve covered on other boards. The mixed fusing allows you to match protection to cable run length, with 2.5A for long runs and 1A for shorter ones. The 24V DC output capability makes it compatible with modern speed sensors and test equipment, and the 0-10kHz frequency range covers the typical speed range of 60Hz turbines.

We’ve used the HFXE1D1C 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 locking terminals on the 1D suffix ensured the test leads remained secure despite frequent reconnections. The mixed fusing allowed us to use the 2.5A bank for the long cable runs to the test fixture and the 1A bank for the short connections to the oscilloscope. The board’s frequency accuracy of ±0.02% of setting ensured that the test signal was more accurate than the sensors being tested.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the 16-bit resolution on the HFXE1D1C?
A: The 16-bit resolution provides the finest frequency control available on the Mark V platform—65536 steps. At 10kHz, the step size is about 0.15Hz—far finer than the 0.6Hz of a 14-bit board or the 2.4Hz of a 12-bit board. This allows you to set frequencies with ultra-fine precision, essential for calibration applications and precision control algorithms. The frequency accuracy improves to ±0.02% of setting.

Q: Why does the HFXE1D1C have mixed fusing (2.5A and 1A)?
A: The mixed fusing allows you to size protection appropriately for different cable runs. The 2.5A bank is for longer cable runs (over 100 meters) where cable capacitance can cause inrush currents. The 1A bank is for shorter runs (under 100 meters) where lower fuse ratings are sufficient. The outputs themselves draw minimal current—it’s the cable capacitance that drives the need for higher fuse ratings.

Q: What’s the advantage of the locking terminals on the 1D suffix?
A: The locking terminals have a plastic latch that prevents the wire from pulling out under vibration. This is particularly important for precision frequency outputs, where intermittent connections can cause frequency errors or pulse dropouts. The locking mechanism is a simple but effective solution for high-vibration environments.

Q: Can I use the HFXE1D1C to calibrate speed sensors?
A: Yes, the HFXE1D1C 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: How do I program the frequency on the HFXE1D1C?
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 HFXE1D1C has a 1.0A backplane current draw. Is that higher than other frequency output boards?
A: Yes, the HFXE1D1C 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 HFXE1D1C have conformal coating?
A: Not by default. The 1D1C suffix indicates locking terminals and mixed fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HFXE1G1C). The standard HFXE1D1C is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

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