GE / Bently Nevada TK21 Oscilloscope Interface

The GE / Bently Nevada TK21 Oscilloscope Interface bridges Bently Nevada machinery monitoring systems and standard oscilloscopes to enable visualization and analysis of vibration signals. This specialized module accepts XY and Keyphasor transducer inputs and outputs conditioned signals via BNC connectors to dual-channel oscilloscopes equipped with Z-axis (external blanking) capability. The TK21 supports X versus Y orbit displays for real-time vibration, position, and phase monitoring - critical for diagnostics and predictive maintenance of rotating machinery.

Technical Specifications Signal Interfaces

XY Transducer Inputs and Keyphasor Transducer Inputs

Maximum input signal: ±24 Vdc

Transducer output bias adjustment: +12 Vdc to -12 Vdc (10 K ohm load)

Transducer DC gain: 0.985 to 0.995 (10 K ohm load)

Signal offset: 5 mV maximum

Keyphasor gain adjustment range: +3 to -3 (factory setting: -0.12 for Tektronix® compatibility)

Keyphasor DC offset adjustment: +12 Vdc to -12 Vdc (factory setting: +2.5 Vdc)

High-pass filter corner frequency: 100 Hz to 110 Hz Power Requirements

110 Vac option: 95–125 Vac, 50/60 Hz, single phase; 50 mA maximum; 100 mA 250 Vac time-delay fuse

220 Vac option: 190–275 Vac, 50/60 Hz, single phase; 25 mA maximum; 60 mA 250 Vac time-delay fuse Oscilloscope Requirements

Dual-channel oscilloscope with Z-axis input (external blanking)

X versus Y (orbit display) capability

Recommended for analog oscilloscopes

Key Features

Horizontal and vertical offset adjustment controls

Output bias indicator LEDs

Adjustable Keyphasor gain and offset for multi-oscilloscope compatibility

Factory-optimized settings for Tektronix® oscilloscopes

BNC connectors for all signal connections

Typical Applications

Rotating machinery vibration analysis and trending

Real-time orbit display monitoring

Keyphasor-based phase reference diagnostics

Predictive maintenance and failure prevention

Compatibility & Integration The TK21 interfaces with XY and Keyphasor proximity transducers from Bently Nevada systems. Signal conditioning and output levels are factory-preset for compatibility with most Tektronix® oscilloscopes, with user-adjustable gain and offset for integration with alternative platforms.