Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TK81 |
| Brand | Bently Nevada (Baker Hughes) |
| Product Type | Tunable Filter / Vibration Meter |
| Origin | Not specified in supplied data |
| Transducer Compatibility | Displacement, velocity, and acceleration transducers |
| Maximum Input Signal | 10 V peak-to-peak |
| Input Impedance | 95 kOhm |
| Scale Factor | 5 to 9,999 mV per engineering unit |
| Frequency Response | 1.66 Hz to 1,666 Hz |
| Speed Range | 100 to 100,000 RPM |
| Integration | Single integration above 10 Hz |
| Filter Type | Digital filter approximating an analog filter |
| Filter Q | Q = 11 |
| Display | 4-line by 16-character LCD |
| Display Units | Metric or English |
| Measurement Modes | Peak-to-peak, zero-to-peak, RMS |
| Accuracy | +/-5% for non-filtered, non-integrated signals |
| Filtered/RMS Accuracy | +/-10% |
| Battery | 9 V alkaline, NEDA 1604A |
| Battery Life | Approximately 20 hours |
| Operating Temp | 0 deg C to +40 deg C |
| Storage Temperature | -20 deg C to +70 deg C |
| Relative Humidity | Up to 90%, non-condensing |
| Dimensions | 191 mm x 102 mm x 58 mm |
| Weight | 316 g |
Rotor Dynamics and Tunable Filtering
The TK81 processes vibration signals from displacement, velocity, and acceleration transducers. The selected scale factor converts the transducer input into the configured engineering-unit display.
The digital filter covers 1.66 Hz to 1,666 Hz and approximates an analog filter with Q = 11. This allows the operator to isolate frequency-specific vibration components from the unfiltered measurement.
For rotor-dynamics measurements, the specified speed range corresponds to 100 to 100,000 RPM. Single integration is available above 10 Hz when the measurement requires an integrated signal representation.
The supplied data does not specify eddy-current probe gap-voltage targets or channel-to-channel cross-talk performance. Therefore, no additional probe scaling or gap-voltage values are assigned to the TK81.
Frequently Asked Questions
Q: What transducer signals can the TK81 accept?
A: The TK81 accepts displacement, velocity, and acceleration transducer signals. The maximum input signal is 10 V peak-to-peak.
Q: What is the tunable filter range?
A: The digital filter operates from 1.66 Hz to 1,666 Hz with Q = 11.
Q: What measurement formats are available?
A: The TK81 provides peak-to-peak, zero-to-peak, and RMS measurement formats. The supplied data specifies +/-5% accuracy for non-filtered, non-integrated signals and +/-10% for filtered/RMS measurements.
Field Installation Guidelines
- Verify the connected transducer type before configuring the measurement scale.
- Confirm that the transducer output does not exceed the 10 V peak-to-peak input limit.
- Configure the engineering-unit scale factor according to the connected transducer.
- Route signal leads separately from high-current power conductors where practical.
- Apply appropriate shield termination for the transducer signal wiring.
- Select filtered or unfiltered measurement mode according to the required vibration measurement.
- Keep the filter setting within the specified 1.66 Hz to 1,666 Hz range.
- Verify that the operating temperature remains within 0 deg C to +40 deg C.
- Avoid operation above the specified 90% non-condensing relative humidity limit.
- Check the 9 V battery condition before extended measurements.
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