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Model 10A96
 Amplified Accelerometer Vibration Conditioner

Input Type Description SPS6000 SPS8000 System 10
Accelerometer Amplified Accelerometer Vibration X*X
 X-X
 X*X


This single-channel conditioner card measures the true RMS value of the vibratory component of the output signal of an amplified piezoelectric accelerometer, for which an excitation of ±15 V-DC is provided. It also measures average acceleration, which is presented as a secondary output. The 10A76 is ideal for any number of applications where the accurate monitoring of vibration is critical- as, for example, in the testing of motors, gearboxes, pumps, engines, conveyors, fans, and compressors.

Pump Vibration Monitoring The 10A96’s "front-end" amplifier gain is user-selectable (1, 2, 5, 10, 20, 50, or 100), which allows the card to accept accelerometer signals from ±50 mV to ±5 V, full scale. The 10A96 also features a 10-Hz high-pass filter with selectable gain, followed by a band-pass filter with selectable upper cut-off frequency (see Specifications). The card may thus be configured for specific test or process conditions such as operating frequency or RPM, expected vibration amplitude, etc.

In the SPS6000 System, the conditioner employs "calculated" calibration involving entry of the sensitivity rating of the channel’s transducer in units of "mV/g (RMS)" (as specified by the accelerometer manufacturer), as well as the nominal full-scale rating in RMS units of "g" (as specified by the manufacturer). In System 10, the "calculated" procedure is combined with a special "two-point" zero and span calibration.

Specifications:
  • Input Range: User-selectable amplifier gain accommodates accelerometer signal from ±50 mV to ±5 V, full scale
  • Excitation: Fixed ±15 V-DC nominal; 15 mA, maximum
  • Amplifier:
      Normal-Mode and Common-Mode Range: ±5 V operating; ±7 V without instrument damage
      Common-Mode Rejection Ratio: DC: -60 dB; at 60 Hz and 1 kHz: -50 dB
      Input Impedance (Differential and Common-Mode): 108 M-ohm and 5-nanoamp bias current; for special analog filtering provisions, see the Filters specification, below
      Offset: Initial: ±0.2% of full scale; vs. Temperature: ±50 ppm/°C
      Gain Accuracy: ±0.02% of full scale typical, following calibration*
      Gain Stability (center of chosen passband): vs. Temperature: ±100 ppm/°C
  • Filters:
    1. LOW-PASS: 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at 100 Hz
        Step-Response Settling Time (Full-Scale Output):
        To 1% of final value: 100 msec
        To 0.1% of final value: 150 msec
        To 0.02% of final value: 600 msec
    2. BAND-PASS: Selectable upper cutoff frequency for each subchan-nel: 20, 40, 80, 125, 250, 500, 1000, or 1600 Hz
    3. HIGH-PASS: 10 Hz, with selectable gain of 1, 2, 5, 10, or 20
  • Auxiliary Outputs: Filtered outputs for RMS and vibration frequency available on wire-wrap pins
    *Initial (uncalibrated) inaccuracy may be as great as ±1.0% of full scale (see Accuracy Specifications). Maximum error that could occur upon replacement of a Model 10A96 not followed by calibration is ±2% of full scale.


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