Instruments > ASC50

Model ASC-50

CE Certified




Download Data sheet PDF File

Download Operating Manual PDF File

Download Adobe Acrobat Reader
Download Acrobat Reader

Over 200 LP, HP, BP, BR
Analog & DSP Filter Options
April 2001


Orders for Export U.S. Selling Price + 20%
Minimum Order Value $150.00 F.O.B. Ottawa, IL
Lead-Time: 2 weeks A.R.O. Accept Visa, Mcard, Amex
(No Longer Available)
Shopping Cart




Frequency Devices’ ASC-50, is a laboratory bench-top programmable instrument that combines familiar analog signal input and output with the power and flexibility of DSP. The ASC-50 provides the user with finger-tip control of filter type, (low-pass, high-pass, band-pass, and band-reject), operating frequency, pole/bandwidth configuration, pre and post gain settings, and analog/DSP filter functions - including many not available through conventional analog techniques. All are accessible at the touch of a button. With a frequency range from 0.1Hz to 30kHz combined with amplitude response of Butterworth, Chebychev, elliptic and finite-impulse-response (FIR) filter functions, the ASC-50 offers wide tuning flexibility without the need for pre-defined programming.

An analog instrumentation interface provides input gain; DC offset control and variable output gain along with selectable single-ended and differential inputs to accommodate a variety of driving signals. Additionally, input DC-offset control is provided with expanded resolution. With the exception of filter and frequency changes all parameters of the ASC-50 can be altered on the fly without halting signal flow. Real-time bypass and gain-control facilitate test comparisons with and without the filter activated.

A four button touch-pad coupled with a liquid-crystal display (LCD) affords the user complete control of various signal conditioning functions. Through the LCD, the operator is prompted by a selection of several filter types, functions, frequency and gain settings. Less than optimum selections are indicated, providing guidance without regimentation. Saturation (over-range) conditions are indicated on both the input and output permitting ease of system setup and use.


  • Wide variety of filter types, functions and frequencies
  • Precise, stable filter performance
  • Adjustable gain and attenuation
  • DC offset control
  • Choice of single or differential inputs
  • Special DSP bypass
  • Analog and DSP clip indicators
  • Filter performance display


Available Operating Modes

Mode 1

  Field 1 Filter type
  Field 2 Filter function
  Field 3 Number of poles or pole-pairs
  Field 4 Q/Bandwidth
  Field 5 Active/Bypass
  Field 5 Corner frequency

Mode 2

  Field 1 Pre-gain control
  Field 2 Post-gain control

Mode 3

  Field 1 Single/Differential control
  Field 2 Input DC offset control

Mode 4

  Field 1 Shape factor/ Transition band
  Field 2 Stop-band bandwidth

Filter Types:

    Available Low-Pass, High-Pass Transfer Functions
  • Low-pass


  • High-pass
  • Butterworth
  • Chebychev (0.1dB Ripple)
  • Elliptic-60 dB (0.1dB Ripple)
  • Elliptic-80 dB (0.1dB Ripple)
  • Band-pass


  • Band-reject
  • FIR-40 dB
  • FIR-60 dB
  • FIR-80 dB

Filter Functions:

  • Butterworth
(Buttr)   Available Band-Pass, Band-Reject Transfer Functions
  • Chebyshev


  • Elliptic-60dB
  • Butterworth
3,4 Pole-Pair   Q = 2,5,10,20
  • Elliptic-80dB
  • Chebychev (0.1dB Ripple)
3,4 Pole-Pair   Q = 2,5,10,20
  • FIR-40dB
  • Elliptic-60 dB (0.1dB Ripple)
3,4 Pole-Pair   Q = 2,5,10,20
  • FIR-60dB
  • Elliptic-80 dB (0.1dB Ripple)
3,4 Pole-Pair   Q = 2,5,10,20
  • FIR-80dB


  • FIR-40 dB
  • FIR-60 dB
  • FIR-80 dB

Gain Control:

  • PRE - Analog pre-gain range 0 to +36dB in 6dB steps
  • POST - Digital post-gain range -48dB to +42dB in 6dB steps.

DC Offset Control:

  • Input DC offset range
± 5 Volts      

Over-Range Indication:

  • Analog saturation, clipping detection (Ü CLIP)
  • Digital saturation, clipping detection (CLIP Þ)



(@ 25°C and rated power Input)

Input Characteristics
  • Input Impedance:
    • 1MΩ || 47pF to analog ground (each input)
  • Input Configuration
    • Single Ended or Differential
  • Analog Clipping Indicator Threshold
    • ±10V
  • DC Offset
    • ±5V DC
  • Analog Pre-Gain Range
    • 0 to +36 dB (6 dB steps)
  • Common Mode Rejection Ratio :
    • >60 dB @ 1 kHz
Output Characteristics
  • Output Impedance:
    • < 1 W
  • Output Configuration
    • Single ended
  • Digital Clipping Indicator Threshold
    • ± Full scale (Digital to analog converter)
  • Digital Post-Gain Range
    • -48 dB to +42 dB (6 dB steps)
  • Linear Signal Level
    • ±10V Peak (7.07Vrms) max.
  • Safe Signal Level
    • ±60V Peak max.
  • Total Harmonic Distortion
    • -70 dBV typ. @ 7.07Vrms 1 kHz (Bypass condition 30 kHz BW)
  • Noise
    • -90 dBV typ. input grounded (Bypass condition 30 kHz BW)


We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements, recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright.

Frequency Devices, Inc.
Your engineering partner for signal conditioning
  1784 Chessie Lane
Ottawa, IL 61350

Fax: (815) 434-8176


Phone: (815) 434-7800
or (800) 252-7074 (U.S. only)

Copyright © 2001-2014 Frequency Devices
All Rights Reserved