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| Model 950 Single ChannelDescription Frequency Devices' Model 950 instruments furnish the user with an 8-pole low-pass or high-pass filter that is tunable by front panel controls. The controls allow the user to select a corner frequency between 10 Hz and 50 kHz with 6 steps from each of two selectable ranges. The instrument exhibits an input impedance of 1 Meg shunted by 47pF to a single ended signal source. When configured in the differential mode, the instrument has a common mode rejection ratio (CMRR) which exceeds 60dB; in this mode the instrument presents an input impedance of 2 Meg shunted by 47pF to a double ended single source. Front panel gain control also enables the operator to select a gain factor of 0, 10, or 20dB. Standard operational features include: 1) Adjustable Frequency Control 2) Differential Input Amplifiers 3) Adjustable Gain Control 4) Off-set Adjustment 5) BNC Connectors for Signal I/O Compact size and manual rotary switch front panel controls make 950 instruments a popular, cost effective, easy-to-use solution for signal conditioning applications in the following areas: Anti-aliasing Filters Biomedical/Biotechnology Applications Data Recording/Playback Data Smoothing EKG/EEG Signal Filtering FDM/PCM Signal Filtering Medical Research Industrial Process Control Seismic Analysis Vibration Analysis 1 Certified Tunable Filter Instruments Available Low-Pass Models: . . . . . . . . . . . . . Page 950L8B 8-pole Butterworth. . . . . . . . . . . . . . . . . . 3 950L8L 8-pole Bessel . . . . . . . . . . . . . . . . . . . . . 3 Available High-Pass Models: . . . . . . . . . . . . . Page 950H8B 8-pole Butterworth. . . . . . . . . . . . . . . . . . 3 General Specifications: . . . . . . . . . . . . . . . . . . . 6 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com * Web Address: http://www.freqdev.com Model 950 Tunable Filter Instruments BLOCK DIAGRAM GAIN (dB) INPUT 10dB 0dB 20dB A-B A + DIFF AMP 8-POLE TUNABLE FILTER OFFSET NULLED CORNER FREQUENCY TUNING OFFSET TYPICAL ADJUSTMENT FUNCTION OUTPUT AMP OUT A B TYPICAL FRONT PANEL BNC CONNECTOR ON TUNEABLE ACTIVE FILTER INPUT A A-B A GND 20 GAIN (dB) 10 0 - 950 50 100 20 10 200 FREQUENCY 500 IN Hz CORNER OFFSET OUT + B R x100 A N G E x1 2 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com * Web Address: http://www.freqdev.com Model 950 Tunable Filter Instruments Model Product Specifications Transfer Function Range fc Theoretical Transfer Characteristics Passband Ripple (theoretical) 950L8B Low-Pass 8-Pole, Butterworth 10 Hz to 50.0 kHz Appendix A Page 9 0.0 dB 0 0.1 dB typ. 0 0.2 dB max. 950L8L Low-Pass 8-Pole, Bessel 10 Hz to 50.0 kHz Appendix A Page 4 0.0 dB 0 0.1 dB typ. 0 0.2 dB max. Model 950H8B High-Pass Transfer Function Range fc Theoretical Transfer Characteristics Passband Ripple (theoretical) 8-Pole, Butterworth 10 Hz to 50.0 kHz Appendix A Page 29 0.0 dB 0 0.2 dB to 100 kHz 0 0.5 dB to 120 kHz 120 kHz 48 dB/Octave fc 2% max. 0.05% typ. 2% max. 0.01%/C typ. 0.02%/C max. -3 dB -360 80.0 dB 60.0 dB 3.01 dB 0.00 dB <-88 dB typ. 100 mVrms typ. 0.31 fc 0.42 fc 1.00 fc 2.00 fc DC Voltage Gain (non-inverting) Voltage Gain (non-inverting) Power Bandwidth Stopband Attenuation Rate Cutoff Frequency Accuracy Stability Amplitude Phase Filter Attenuation 48 dB/Octave fc 2% max. 0.05% typ. 2% max 0.01%/C typ. 0.02%/C max. -3 dB -360 0.12 dB 3.01 dB 60.0 dB 80.0 dB <-90 dB typ. 50 mVrms typ. 0.80 fc 1.00 fc 2.37 fc 3.16 fc 48 dB/Octave fc 2% max. 0.05% typ. . 2% max. 0.01%/C typ. 0.02%/C max. -3 dB -182 1.91 dB 3.01 dB 60.0 dB 80.0 dB <-90 dB typ. 50 mVrms typ. 0.80 fc 1.00 fc 4.52 fc 6.07 fc Stopband Attenuation Rate Cutoff Frequency Accuracy Stability Amplitude Phase Filter Attenuation Total Harmonic Distortion @ 1 kHz Narrow Band Noise (5 Hz - 100 kHz) Total Harmonic Distortion @ 1 kHz Narrow Band Noise (5 Hz - 100 kHz) 3 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com * Web Address: http://www.freqdev.com Model 950 Location of Front Panel Terminals and Controls Location of Front Panel Terminals and Controls ON A INPUT A A-B A GND TUNEABLE ACTIVE FILTER GAIN (dB) 10 0 20 OFFSET 950 50 100 20 10 200 FREQUENCY 500 IN Hz CORNER G OUT + C&D B E B R x100 A N G E x1 I H F Location of Rear Panel Terminals and Controls K J APR.01 SELECT FUSE NOM. FREQ. SN: 00105 115v (250V 0.1A) 60 Hz 950L8L 230v (250V 0.1A) 50 Hz L M corcom WARNING: Do not remove covers, no user serviceable parts inside. Contact: Frequency Devices for service, tech@freqdev.com MADE IN U.S.A FRONT PANEL A. POWER Status Lamp: This red LED indicates whether or not the power to the analog filter circuitry of a Model 950 instrument is on. B. INPUT Switch: This three position toggle configures the instrument for either differential inputs (A-B), a singleended input (A), or input nulling (GND) which grounds both the (A) and (B) input terminals. C. & D. (A) and (B) Input Terminals: This pair of shielded, female BNC connectors accept signal inputs (A) and (B). The instrument applies a noninverting gain to input (A) and an equal but opposite inverting gain to input (B) while the GAIN switch sets the magnitude of differential gain to 0, 10, or 20 dB. The BNC shields have been internally connected to the instrument ground. E. GAIN Switch: This three-position toggle switch selects an overall filter gain of 0, 10, or 20dB. F. OFFSET Adjust: This adjustment is intended to zero the offset that results from the instrument's own circuitry and does not provide for wide range offset to remove dc input signals. G. CORNER FREQUENCY Selector Switch (10-500Hz): This six position rotary switch selects the digit value of the corner frequency. The switch selectable values are 10, 20, 50, 100, 200 and 500, H. MULTIPLIER Selector Switch: This two-position toggle switch multiplies by a factor of either 1 or 100x, the value set on the CORNER FREQUENCY selector switch. I. OUT Terminal: This terminal is a female BNC connector. The shield on the BNC is internally connected to the instrument ground. REAR PANEL J. IDENTIFICATION LABEL: This label identifies the date of manufacture, serial number, filter type and operating power requirements. K. POWER CONNECTION: power plug location. Denotes L. POWER ON/OFF Switch: A twoposition toggle switch on the back panel Power Module that interrupts/completes the power circuit. M. Voltage Selector Module: 115V Operation The power module window shows the operating voltage (115V or 230V). At time of shipment, the voltage window will be set to the 115V position. 230V Operation For 230V operation, use a small flathead screwdriver to pry open the fuse module door. Remove the fuse cartridge, fuse clip and single fuse for 115V operation. Install two 5 X 20 mm 250V, 0.1A fuses into the fuse cartridge, rotate and insert fuse cartridge so 230V is visible in fuse module door when closed. 4 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com * Web Address: http://www.freqdev.com Model 950 Operation and Application Guide Lines Initial Setup Select desired operating voltage 115 Vac or 230 Vac. See note "N" page four. Set the POWER ON/OFF Switch to ON. A continuously lit POWER lamp indicates power applied. Allow the instrument a three-minute warm-up period to achieve thermal equilibrium. To perform initial adjustment and/or operational testing, set the remaining front panel controls as follows: a) The CORNER FREQUENCY switch and the MULTIPLIER to the desired corner frequency. b) The OFFSET control to approximately mid-range. c) The GAIN switch to the desired value. e) The INPUT switch to ground (GND). Connect a dc-coupled oscilloscope, of vertical sensitivity 10mV/CM or better, or a digital voltmeter (DVM) to the instrument front panel BNC connector labeled OUT. Set the OFFSET control for a zero-volt reading on the scope. Subsequent changes of CORNER FREQUENCY and GAIN control settings will introduce a small dc output offset, which should be zeroed for critical applications. Leaving all other controls unchanged, set the Input Switch to (A-B) and apply a 5Vdc signal simultaneously to input BNCs (A) and (B). The voltage measured at the OUT BNC should be 55=OVdc. This completes preliminary test and adjustment. Corner Frequency Selection To select a corner frequency, simply set the CORNER FREQUENCY switch and the MULTIPLIER switch for the desired numerical value. The Differential Input The instrument utilizes a differential input amplifier to reject prevalent forms of electrical interference, while presenting desirable input characteristics to the signal source requiring filtering. The differential input configuration is ideal for measuring the difference between two values rather than the values themselves. Bridge circuits utilizing strain gages, thermocouples and a variety of other types of transducers generate differential full-scale output voltages in the order of millivolts that are often superimposed upon volt-level reference and noise values. The importance of CMRR In actual system environments, each signal and power return conductor can generate an interference voltage proportional to the net conductor resistance and the electrical current level. Any such interference voltages appear as common mode signals to the amplifier, and are rejected as such. Circuit model illustrating relationship between filter's differential input amplifier and external signal and error sources. 0d B INPUT SIGNAL AND NOISE VOLTAGE SOURCES RSA A * (+) RCM+ RD 10 20 dB dB DIFFERENTIAL INPUT AMPLIFIER GAIN = K + DIFF AMP - * V A V CM VB OUT OUTPUT AMPLIFER * SIGNAL COMMON RSB RCM() B * COUPLED POWER LINE NOISE VOLTAGE Vo = K(VA - VB) + Vcm/CMRR : WHERE K = 1, 10 AND 10 FOR GAIN SETTINGS OF 0, 10 AND 20dB RESPECTIVELY. Vs () COM (+) +Vs SEE TEXT FOR REMAINING TERMS. * DENOTES FRONT PANEL ACCESS VP AC POWER SUPPLY SIGNAL COMMON 5 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com * Web Address: http://www.freqdev.com Model 950 Specifications (@25C and rated Power Input) Input Characteristics Input Impedance: Differential Single Ended Input Voltage: Linear Differential* Max Safe Differential Max Safe Common Mode Bias Current Common Mode Rejection ratio with 2k source unbalance and 0 dB Gain Typical Common Mode Rejection Ratio 0 2 M Shunted by 47pF 1 M Shunted by 47pF 20V p-p (Gain Set at 0 dB) Any Continuous Value between 75V Any Continuous Value between 75V 4 nA typ.; 20 nA max. > 60dB, dc to 50kHz dB (RMS) dB (RMS) -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 10 100 1000 10000 100000 Bessel filter type set to 50 kHz filter corner frequency, 0 dB gain setting. Frequency (Hz) Frequency(Hz) Output Characteristics Full Power Bandwidth Related Output Short Circuit Output Current Output Protection Output Impedance Offset Voltage dc to 50kHz 10V p-p for RL = 50W 20V p-p for RL = 2kW +/-100 mA continuous +/-200 mA without damage Short Circuit to Ground Only 50 Adjustable to Zero at Front Panel (Range +/-500mV dc) Typical Output Noise 0 -20 Bessel filter type set to 50 kHz filter corner frequency, 0 dB gain setting, input grounded. -40 dB (re:1VRMS) dB (re:1V RMS) -60 -80 -100 Power Supply AC Line Operation: Power Voltage Frequency Range-Rear Panel: 115 V 230 V Fuse Temperature Operating Temperature: Storage Temperature Mechanical Dimensions Weight Case Material Color -120 -140 6 Watts max. 105 to 125Vac @ 50/60Hz 210 to 250Vac @ 50Hz 0.1 Amp 10 100 1000 10000 100000 Frequency (Hz) Frequency (Hz) 0 C to +50 C -25 C to +70 C 2.375"H x 7.0"W x 8.3"D 6.03cmH x 17.75cmW x 21.08cmD 1.5 lbs; 0.68 kgs. ABS plastic PC Bone * Signal plus common mode voltage cannot exceed 20V peak for a linear output. 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. IN-00950-00 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com * Web Address: http://www.freqdev.com 6 8-Pole Bessel Appendix A Theoretical Transfer Characteristics 1 f/fc Amp Phase Delay (Hz) (dB) (deg) (sec) 0.00 0.00 0.00 .506 0.10 -0.029 -18.2 .506 0.20 -0.117 -36.4 .506 0.30 -0.264 -54.7 .506 0.40 -0.470 -72.9 .506 0.50 -0.737 -91.1 .506 0.60 -1.06 -109 .506 0.70 -1.45 -128 .506 0.80 -1.91 -146 .506 0.85 -2.16 -155 .506 0.90 -2.42 -164 .506 0.95 -2.71 -173 .506 1.00 -3.01 -182 .506 -3.67 1.10 -200 .506 -4.40 1.20 -219 .506 -5.20 1.30 -237 .506 1.40 -6.10 -255 .505 1.50 -7.08 -273 .504 1.60 -8.16 -291 .502 1.70 -9.36 -309 .498 1.80 -10.7 -327 .492 1.90 -12.1 -345 .482 2.00 -13.7 -362 .468 2.25 -18.1 -402 .417 2.50 -23.1 -436 .352 2.75 -28.3 -465 .291 3.00 -33.4 -489 .241 3.25 -38.3 -509 .201 3.50 -43.1 -526 .170 4.00 -51.8 -552 .126 5.00 -66.8 -587 .077 6.00 -79.2 -610 .052 7.00 -89.8 -626 .038 8.00 -99.0 -638 .029 9.00 -107 -647 .023 10.0 -114 -655 .018 Low-Pass Frequency Response 0 Amp (dB) -20 -40 -60 -80 -100 0.1 2 1.0 2 3 4 5 6 7 10.0 Normalized Frequency(f/fc) 3 4 5 6 78 Delay (Normalized) 1.0 Delay (sec) 0.5 0.0 0.1 0.15 2 3 4 5 6 7 89 Normalized Time (1/f sec) 1.0 1.5 Step Response Step Response (V/V) 1.2 1.0 0.8 0.6 0.4 0.2 -0.0 -0.2 0 1.Normalized Group Delay: The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc). Actual Delay = Normalized Delay Actual Corner Frequency (fc) in Hz 1 Normalized Time (1/f sec) 2 3 4 5 7 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com Web Address: http://www.freqdev.com Fax on Demand: 978/521-5178 Low-Pass 8-Pole Appendix A Theoretical Transfer Characteristics 1 f/fc Amp Phase Delay (Hz) (dB) (deg) (sec) 0.00 0.00 0.00 .816 0.10 0.00 -29.4 .819 0.20 0.00 -59.0 .828 0.30 0.00 -89.1 .843 0.40 0.00 -120 .867 0.50 0.00 -152 .903 0.60 -0.001 -185 .956 0.70 -0.014 -221 1.04 0.80 -0.121 -261 1.19 0.85 -0.311 -283 1.29 0.90 -0.738 -307 1.40 0.95 -1.58 -333 1.48 1.00 -3.01 -360 1.46 1.10 -7.48 -408 1.17 1.20 -12.9 -445 .873 1.30 -18.2 -472 .672 1.40 -494 .540 -23.4 1.50 -511 .448 -28.2 1.60 -526 .380 -32.7 1.70 -539 .328 -36.9 1.80 -550 .287 -40.8 1.90 -44.6 -560 .253 2.00 -48.2 -568 .226 2.25 -56.3 -586 .174 2.50 -63.7 -600 .139 2.75 -70.3 -611 .113 3.00 -76.3 -621 .094 3.25 -81.9 -629 .080 3.50 -87.1 -635 .069 4.00 -96.3 -646 .052 5.00 -112 -661 .033 6.00 -125 -671 .023 7.00 -135 -678 .017 8.00 -144 -683 .013 9.00 -153 -687 .010 10.0 -160 -691 .008 Butterworth Frequency Response 0 Amp (dB) -20 -40 -60 -80 -100 0.1 2 3 4 5 6 78 1.0 2 3 4 5 67 Normalized Frequency(f/fc) 10.0 2.0 Delay (sec) Delay (Normalized) 1.0 0.0 0.1 0.15 2 3 4 Normalized Time (1/f sec) 5 6 7 8 9 1.0 1.5 Step Response Step Response (V/V) 1.2 1.0 0.8 0.6 0.4 0.2 -0.0 0 1 2 3 4 Normalized Time (1/f sec) 5 1.Normalized Group Delay: The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc). Actual Delay = Normalized Delay Actual Corner Frequency (fc) in Hz 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com Web Address: http://www.freqdev.com 8 High-Pass 8-Pole Appendix A Theoretical Transfer Characteristics 1 f/fc Amp Phase Delay (Hz) (dB) (deg) (sec) 0.10 -160 691 0.819 0.20 -112 661 0.828 0.30 -83.7 631 0.843 0.40 -63.7 600 0.867 0.50 -48.2 568 0.903 0.60 -35.5 535 .956 499 0.70 -24.8 1.04 459 0.80 -15.6 1.19 437 0.85 -11.6 1.29 413 0.90 -8.06 1.40 0.95 -5.15 386 1.48 360 1.00 -3.01 1.46 275 1.20 -0.229 0.873 226 1.40 -0.020 0.540 -0.002 194 1.60 0.380 170 1.80 0.00 0.287 152 0.00 2.00 0.226 0.139 120 0.00 2.50 0.00 99.2 0.094 3.00 0.052 0.00 74.0 4.00 5.00 0.00 59.0 0.033 49.0 0.023 6.00 0.00 0.00 42.1 0.017 7.00 0.00 36.8 0.013 8.00 0.00 32.7 0.010 9.00 10.0 0.00 29.4 0.008 Butterworth Frequency Response 0 Amp (dB) -20 -40 -60 -80 -100 0.1 2 1.0 2 3 4 5 6 7 10.0 Normalized Frequency(f/fc) 3 4 5 6 78 1.Normalized Group Delay: The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc). Actual Delay = Normalized Delay Actual Corner Frequency (fc) in Hz 1784 Chessie Lane, Ottawa, IL 61350 * Tel: 800/252-7074, 815/434-7800 * FAX: 815/434-8176 e-mail: sales@freqdev.com Web Address: http://www.freqdev.com 9 |
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