Overview

The TK81 Tunable Filter/Vibration Meter is a portable handheld instrument designed for basic vibration measurements. It can display vibration in both unfiltered (overall) and filtered modes, accepting inputs from displacement, velocity, and acceleration transducers. Note that it does not provide power for these transducers.

Specifications

Inputs

• Signal: Accepts displacement, velocity, or acceleration.
• Maximum Input: 10 V peak-to-peak.
• Scale Factor: Selectable from 5 to 9999 mV per engineering unit.
• Input Impedance: 95 kΩ.

Signal Conditioning

• Frequency Response:
  • 1.66 Hz to 1,666 Hz (100 to 100,000 RPM).
• Integration:
  • Single integration available for frequencies above 10 Hz (600 RPM).
• Filter:
  • Operating Range: 1.66 Hz to 1,666 Hz (100 RPM to 100,000 RPM).
  • Type: Digital, approximating an analog filter with a Q of 11.

Outputs

• Display: 4 line by 16 character LCD.
• Display Units: Selectable Metric or English; options include peak-to-peak, zero-to-peak, or RMS.
  • Note: RMS readings may fluctuate at < 10 Hz (600 RPM).
• Accuracy:
  • Within 5% for:
    • Non-filtered, non-integrated signals at full frequency range.
    • Non-filtered, integrated signals at 10-16.67 kHz (600-100 k RPM).
  • Within 10% for:
    • All RMS measurements.
    • Filtered, non-integrated signals at full frequency range.
    • Filtered, integrated signals at 10-16.67 kHz (600-100 k RPM).

Power Requirements

• Battery: 9-Volt alkaline transistor battery (NEDA 1604A).
• Battery Life: 20 hours nominal.

Environmental Limits

• Operating Temperature: +0°C to +40°C (+32°F to +104°F).
• Storage Temperature: -20°C to +70°C (-4°F to +158°F).
  • Note: A battery stored above +104°C (+219°F) or below 0°C (+32°F) will have a reduced shelf life.
• Relative Humidity: Up to 90% non-condensing.

Physical Specifications

• Size:
  • Height: 191 mm (7.5 in)
  • Width: 102 mm (4.0 in)
  • Depth: 58 mm (2.3 in)
• Weight: 316 g (0.7 lb)