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Model 10A40
 Frequency to Voltage Input Conditioner

Input Type Description SPS6000 SPS8000 System 10
Frequency, Speed, RPM, Flow Frequency Input X-X
 X-X
 X*X


This single-channel conditioner is for measurement of flow, rpm, and other phenomena that can be sensed by pulse transformer transducers with two-wire isolated windings (tachometer pickups, turbine flowmeters, etc.), transistor or logic-circuit drivers, "zero-velocity" (true digital output) sensors, and similar frequency-generating transducers. Nominal ±5 V-DC excitation is supplied for use with a "zero-velocity" sensor.

The 10A40 accepts a wide range of wave shapes and voltage levels, though it is not recommended for measuring frequencies under 25 Hz. The "Smart Schmitt" input threshold automatically adjusts to accommodate signals from 100 mV to 200 V.

Fig. 1- Using the 10A40 for Measurement of Motor RPM Capacitive coupling of 0.1 or 10 microfarads is provided for low-frequency inputs, to eliminate false triggering by signal noise and/or any positive or negative DC offset that exists for the frequency signal (Noise suppression is always recommended when using a magnetic pickup as the frequency source, as in Fig. 1.). A special trigger-level control guarantees reliable triggering when the input is at the low end of the frequency range.

The System 10 Central Processor controls frequency-range selection and applies an appropriately calculated scaling factor to each measurement, if desired, following initial entry of a special FREQUENCY CALIBRATION (FRQ) command. This convenient "calculated" calibration technique can be used when the manufacturer-supplied full-scale rating of the frequency source (or the highest frequency expected to be measured) is known. A precise 2.097152-MHz crystal frequency reference ensures accuracy of all calibrations, whether "absolute," "computed" (via the FRQ command), or "two-point" ("dead-weight").

Specifications:
  • Input:
      Type: Any AC or unipolar pulse signal, grounded or floating, irrespective of waveform
      Threshold Level: Accommodates signals from 100 mV to 200 V
  • Frequency Ranges: From 10% to 100% of 250, 500, 1000, 2000, 4000, 8000, 16000, or 32000 Hz; automatically selected- on an individual channel basis- when the channel is configured
  • Excitation: Nominal 10 (i.e., ±5) V-DC; ±50 mA, maximum
  • Amplifier:
      Normal-Mode Range: ±200 V operating and without instrument damage
      Common-Mode Range: ±50 V operating; ±100 V without instrument damage
      Common-Mode Rejection Ratio: At 60 Hz: -120 dB; at 1 kHz: -60 dB
      Input Impedance: Differential: 400 k-ohm; Common-Mode: 100 k-ohm
      Offset: Initial: ±0.05% of full scale; vs. Temperature: ±25 ppm/°C; vs. Time: ±20 ppm/month
      Gain Accuracy: ±0.02% of full scale
      Gain Stability: vs. Temperature: ±25 ppm/°C; vs. Time: ±20 ppm/month
      Ripple and Noise: Readings are within the stated accuracy from 10% to 100% of the frequency range in use
  • Filter: 3-pole modified Butterworth; 3 dB down at 2 Hz; 60 dB down at 25 Hz
      Step-Response Settling Time (Full-Scale Output):
      To 1% of final value: 600 msec
      To 0.1% of final value: 750 msec
      To 0.02% of final value: 1 sec
  • Auxiliary Output: Filtered output available on wire-wrap pin


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