Telemetry FHT


The Fast Hybrid Telemetry (FHT) is the most critical component of a cased hole logging system; it links the surface panel and the rest of the sensors connected below via a Half Duplex communication. The FHT is the fastest telemetry in the market, with a Wireline Bus (WLB) of up to 400Kbps and an Internal Bus (OWB) of 1.5Mbps.

The FHT can uplink analog packages in between digital packages, so you have the option to combine different types of tools on the string.

FHT can be used with Scientific Data Systems panels and their software Warrior.

Version “A” is the most basic configuration with an uplink of up to 120kbps and an internal Bus of 500kbps.

Version “B” is the most powerful configuration, with an uplink of up to 400kbps and an internal Bus of 1.5Mbps.



Communication Half Duplex with parity control and checksum
Wireline Bus

for Cased Hole

Uplink 60Kbps to 400Kbps

Downlink 5Kbps

Wireline Bus

for Open Hole

Uplink 120kbps to 800Kbps

Downlink 5Kbps

One Wire Hybrid Bus (Internal Bus) 1.5Mbps

Tool Head Voltage

70VDC – 300VDC

Temperature rate

177 deg C / 350 deg F

Pressure rate

117.2 MPa / 17,000 psi


Tool Power Hybrid Bus up to 5Amps @ 18VDC to 70VDC for tool string, shunt regulator option is available for 2Amps

Analog signal


Memory tools


Type of cables

7/32”, 5/16”, 7/16”, 9/32″ – H2S and Open hole cables

Type of tools supported

Cased hole and Open hole


1-11/16” (43mm) O.D. by 27” (685.8mm) Long

Memory minimum sampling rate


Multi-sampling rates

each sensor can have different sampling rate


the signal is retrieve through an analog equalizer and a digital equalizer all done through an adaptive system

Error detection

the system offers error data and frame error data. In case the data get corrupted, it will be discarded

Tool bus

the telemetry can use the following protocols to communicate with different tools:

  • SPI
  • USB
  • Analog BUS
  • 1553 BUS
  • I2C BUS
  • RS232
  • RS485

Internal Memory

in addition the telemetry have a 32GB internal memory per sensor. The system offers the flexibility to retrieve the data from the memory in real time or memory mode as a stand alone memory tool



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Version "A" Datasheet

Download(429 KB)

Version "B" Datasheet

Download(432 KB)