The 3DM-DH®​3 is a downhole orientation sensor and datalogger. It incorporates acceleration sensors, magnetic field sensors, and temperature sensors, together with an on-board microprocessor, embedded software algorithm, non-volatile memory for configuration, flash datalogging memory, and serial communication interface. Its form-factor, rated temperature range and power supply requirements are optimized for downhole applications. The 3DM-DH3 provides accurate drill path measurements including Inclination, Azimuth, GTF, MTF, Dip Angle, sensor temperatures, G-TOT and H-TOT.

Datasheet Manual
Where to Buy?
U.S. International OEM

List Price:

Best in Class

  •     Precise downhole orientation
  •     High-speed sample rate & flexible data outputs
  •     Extended use, low-power data logging

Easiest to Use

  •     Rapid deployment in the drill string
  •     Outputs drill path measurements

Cost Effective

  •     Reduced cost and rapid time to market for customer’s applications
  •     Aggressive volume discount schedule

Orientation range

360˚ all axes (orientation angles); inclination, azimuth, GTF, MTF, Dip Angle, G-TOT, H-TOT

A/D resolution

24 bits accelerometer; 16 bits magnetometer

Angle resolution



± 0.2˚ inclination

± 0.5˚ azimuth

Angle measurement repeatability

0.1 °

Digital output rate/logging rate

up to 8 Hz

Output modes

acceleration and magnetic field vectors plus temperature; orientation angles plus temperature

Digital output

RS-422 serial (four-wire full-duplex) standard

Serial data rate

115200 baud

Datalogging capacity

up to 32,768 data records

Supply voltage

+6.0 VDC min, +10.0 VDC max

Supply current

50 mA typical when connected to host

16 mA typical when logging at 8Hz

500 μA typical when logging at 1/4 Hz

50 μA typical in deep sleep mode


through hole PCB pads (solder-in)

2 mm pitch, 2 row 16 pin header

Operating Temperature

- 40 ˚C to 125 ˚C (-10 ˚C to 125 ˚C with recommended batteries)


177 mm x 21 mm diameter


91 grams

Shock limit

500 g

Enclosure material

anodized aluminum


Windows XP, Vista, 7

The 3DM-DH3 is operated by a combination RS-422 communication and power cable, part number 4005-0003.



Yes.  The unit is factory calibrated and ready for use with power-up.

Physically, the 3DM-DH3 is easily mounted into the drill string using its body’s threading attachments. It can be tethered to an RS-422 communication cable for continuous real-time measurements to a host computer during drilling operations, or it can be remotely deployed and run as a datalogger, with data retrieval after it has been run through the drill path. The unit can be powered through the communication cable tether from a platform source or by batteries.

The 3DM-DH3 has measurment accuracy of +/-0.2 degrees inclination and +/-0.5 degrees azimuth.

The 3DM-DH3 has a four-wire full-duplex RS-422 serial communication interface.

Yes.  A Windows XP/Vista/7 compatible software is shipped the product.  The software allows the user to configure, operate, display and save data from the sensor.

The 3DM-DH3 will operate within a temperature range of - 40 degrees C to 125 degrees C.

The 3DM-DH3 provides accurate drill path measurements including Inclination, Azimuth, GTF, MTF, Dip Angle, sensor temperatures, G-TOT and H-TOT.

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