3500/42M Bently Nevada

The following graphs show the maximum machine speed allowed for a monitor channel pair configured for REBAM. 

The top graph assumes both channels of the channel pair are enabled. The bottom graph assumes only one channel 

of a channel pair is enabled. The maximum speed is dependent on the number of rolling elements in the bearing. The 

graph assumes that the rotor lowpass filter corner is set at 3.2X the shaft speed and the spike highpass filter corner is 

set at 4X the element pass frequency for the outer race (BPFO).

Description:

Indicates when the 3500/42M is 

communicating with other 

modules in the 3500 rack.

Bypass LED

Indicates when the 3500/42M is in 

Bypass Mode.

Buffered 

Transducer 

Outputs

The front of each monitor has one 

coaxial connector for each 

channel. Each connector is shortcircuit protected.

Output 

Impedance

550 Ω

Transducer 

Power Supply

-24 Vdc

Recorder

+4 to +20 mA. Values are 

proportional to monitor full-scale. 

The monitor provides individual 

recorder values for each channel. 

Monitor operation is unaffected 

by short circuits on recorder 

outputs.

Voltage 

Compliance 

(current output)

0 to +12 Vdc range across load. 

Load resistance is 0 to 600 Ω. 

Resolution

0.3662 µA per bit 

±0.25% error at room 

temperature

±0.7% error over temperature 

range. 

Update rate 100 ms or less.

Shaft Absolute 

Buffered 

Outputs

The Shaft Absolute I/O modules 

have one output for each channel 

group. Each output is short-circuit 

protected.

Shaft Absolute 

Output 

Impedance

300 Ω

Signal Conditioning

Note: Specified at +25 ºC (+77 ºF) unless otherwise noted.

Radial Vibration

Frequency 

Response

Direct filter

User-programmable, single-pole, 

-3db at 4 Hz to 4000 Hz or 1 Hz to 

600 Hz, ± 1% accuracy.

Gap filter

-3 dB at 0.09 Hz.

Not 1X filter

60 cpm to 15.8 times running 

speed. Constant Q notch filter. 

Minimum rejection in stopband of 

-34.9 dB.

Smax 

0.125 to 15.8 times running 

speed.

1X and 2X 

Vector filter

Constant Q Filter. Minimum 

rejection in stopband of -57.7 dB.

Note: 1X & 2X Vector, Not 1X, and Smax 

parameters are valid for machine speeds 

of 60 cpm to 60,000 cpm.

Accuracy 

Direct and Gap

Exclusive of filtering, within 

±0.33% of full-scale typical, ±1% 

maximum. 

1X and 2X

Within ±0.33% of full-scale 

typical, ±1% maximum.

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