NDM
NDM
The MicroTesla NDM, New Digitized Module, is a new, high accuracy, an advanced directional instrument designed for those MWD companies that have developed their own MWD system controller.
It consists of a one-piece chassis made from a solid billet of 6061-TG aluminum. The ends are machined to the Customers system geometry. No end adapters mean no “loose" end adapters and no end adapter misalignment.
The NDM has (1) electronic board, for the core drive, mag sense, analog to digital conversion and power supply. The NDM has a high temperature, 24 bit analog to digital converter for extremely high-resolution measurements.
The MicroTesla ring core, fluxgate magnetometers are qualified to 210 degrees C and these magnetometers can detect a 1.6 nT magnetic field gradient.
Physical
- Length: Nominal 22.0”
- Diameter: 1.37”
- (2) MicroTesla proprietary two-axis fluxgate magnetometers
- (3) Q-flex accelerometers
Electrical
- Surface mount, high-temp electronics with Ulti-pak
- Voltage requirement: +10V to +40V
- Power Usage: 2W peak, .72W idle
- Digital interface: SV TTL
- Calibration coefficients downloaded directly into EEP ROM
Enviornmental
- All boards qualified for high-temp applications, 175C
- Accelerometers qualified, 185C
- MicroTesla magnetometers qualified, 210C
- Stronger stiffer chassis for improved resistance to bend and torsion twist
Mechanical and Environmental Specifications
| Parameter | Minimum | Maximum | Units |
|---|---|---|---|
| Outside Diameter* | 1.37 3.5 | inches cm |
|
| Length* | 22 55.9 | inches cm |
|
| Operating Temperature | 0 + 32 | 175 347 | °C °F |
| Survival Temperature | – 40 – 40 | 190 374 | °C °F |
| Vibration, Random | 20 | g RMS, 25-500 Hz | |
| Shock | 1000 | ½ msec and ½ sine |
Instrument Accuracy Specifications
| Parameter | Minimum | Units |
|---|---|---|
| Inclination accuracy, absolute* | ± 0.08 | degrees |
| Inclination spread on axial rotation at 90° Inc | < 0.08 | degrees |
| Azimuth accuracy, absolute, 90° Inc | ± 0.4 | degrees |
| Azimuth spread axial rotation, 45° through 90° | < 0.35 | degrees |
| Total face accuracy, axial rotation at 90° Inc | ± 0.7 | degrees |
| Total g field accuracy | ± 2.5 | mG |
| Total H field accuracy, absolute | ± 180 | nT |
| Total H field spread | < 150 | nT |
| Magnetic dip accuracy | ± 0.2 | degrees |
| Dip spread | < .25 | degrees |
| Inc.. while rotating | < .25 | degrees |
| AZM while rotating | < 2 | degrees |
| RPM rotation | > 10 | RPM |
| RPM | +/- 2 | RPM |
* Absolute accuracy is achieved when the instrument is tested in a controlled environment using a calibrated and certified reference position