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Models 960 & 960B Wideband High-Gain Single Channel – Certified Amplifier Instrument
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Description
Frequency Devices’ Models 960 & 96 0B instruments are single channel wideband high- gain amplifier instruments. The bandwidth is adjustable from 10 Hz to 1 MHz wide and the gain can be set from 0 dB to 80 dB in 1 dB steps. The Amplifier has an input impedance of 1 M Ω shunted by 47pF in single ended mode and 2 MΩ shunted by 47pF in differential ended mode. The common mode rejection ratio (CMRR) is greater than 55 dB in differential mode. Standard operational features include: Adjustable gain to 80 dB Adjustable bandwidth to 1 MHz Differential or single ended input Differential or single ended output Output can drive 50Ω load Off-set adjustment Overload indicator BNC Connectors for all I/O The optional battery powered 96 0B is particularly well suited to applications requiring isolation from an electrically noisy primary power source. Compact size and manual rotary switch front panel controls makes the 960 amplifier a popular, cost effective, easy -to-use solution for signal conditioning applications in the following areas: Biomedical Applications Data Recording/Playback EKG/EEG Data Amplification Medical Research Seismic Analysis Vibration Analysis Communications Models
960 Standard AC Powered
960B AC Powered, with battery option The 960 & 960B Amplifiers have a built in notch filter for 60 Hz or 50 Hz
Models 960 & 960B Model 960 Series Single Channel – Certified Front Panel Description e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com Location of Front Panel Terminals and Controls A. POWER Status Lamp: This red LED indicates whether or not the amplifier power is on. On the 960B battery operated model this lamp will blink when the battery needs recharging. B. dB Gain Switch : These selector switches allow the user to set the gain from 0 dB to 80 dB in 1 dB steps. C. Bandwidth Switch: This switch changes the amplifier bandwidth from 10 Hz up to 1 MHz in decades. D. Overload Lamp: This red LED comes on when the output of the amplifier is over driven and is no longer in linear gain mode. It will come on when the output is about 24 volts peak-to-peak. Reduc e the gain or the input signal to turn this light off for best operation. E. Input BNC: This is the input connector for the amplifier. In single input mode the input signal is applied to the center pin of the BNC connector and the shell of the BNC connector is grounded. In differential input mode the non-inverting input is the center pin of the BNC connector and the inverting input is the shell of the BNC connector. F. Single/Differential Switch: This switch selects whether the amplifier input is in single ended or differential mode. G. GROUND Terminal: This “Banana” type test jack provides neat and secure access to the internal ground. This terminal is a convenient junction for grounding external system and measurement instrumentation and/or apparatus. H. OFFSET Adjust: This adjustment is intended to zero the offset that results from the instrument’s own internal circuitry. I. Single/Differential Switch: This switch selects whether the amplifier output is in single ended or differential mode. J. Output BNC: This is the output connector for the amplifier. In single output mode the output signal is applied to the center pin of the BNC connector and the shell of the BNC connector is grounded. In differential output mode the non- inverting output is t he center pin of the BNC connector and the inverting output is the shell of the BNC connector. When this switch is in differential mode the gain of the amplifier is automatically adjusted to correct the output gain.
Models 960 & 960B Model 960 Series Single Channel – Certified Rear Panel Description e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com Location of Rear Panel Terminals, Controls and Labels K. IDENTIFICATION LABEL: This label identifies the Model number, filter type, serial number, date of manufacture, operating power limits and fuse requirements of the instrument. L. AC POWER CONNECTION: Denotes plug and fuse location. M. POWER ON/OFF Switch: Is a two - position toggle switch on the back panel that interrupts/completes the power circuit. N. VOLTAGE Selector Module: For 230 Vac operation, use a screwdriver blade to pry open the module door (entry point next to window), remove the red fuse cartridge, replace the 0.2 Amp, 250 V fuse with a 0.1 Amp, 250 Volt fuse, remove the shorting clip in the other leg and replace it with a second 0.1 Amp fuse. Turn the module 180 degrees, re- insert and close the module door. The numerals 230V will now show in the module window. Reverse procedure to change back to 115V. N K L M Model 960B Model 960
Models 960 & 960B Single Channel – Certified Specifications e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com Input Characteristics Input Impedance: Differential 2 MΩ Shunted by 47pF Single Ended 1 MΩ Shunted by 47pF Coupling DC Input Voltage: Linear Differential 20V p-p (Gain Set at 0 dB) Max Safe Any Continuous Value Differential Voltage between ±40V Bias Current 1 nA typ.; 2 nA max. Common Mode > 80 dB @ 1 kHz Rejection ratio > 70 dB @ 10 kHz (0 dB Gain) > 55 dB @ 100 kHz Noise Voltage Density @ 70 dB Gain 12 µVrms/√Hz typ.
1 MHz Bandwidth
Signal* @ 1 kHz with 1 mV @ 0 dB Gain
1 MHz Bandwidth 20 µV @ 40 dB Gain
13 µV @ 70 dB Gain @ 1 kHz with 1 mV @ 0 dB Gain 10 kHz Bandwidth 10 µV @ 40 dB Gain 2 µV @ 70 dB Gain Output Characteristics: Small Signal Bandwidth >1 MHz @ 3 dB down Output Max Voltage 20V p-p for RL-2KΩ (Single Output) 10V p-p for RL=50Ω (DC to 500 kHz) 10V p-p for RL=2KΩ 5V p-p for RL=50Ω (500 kHz to 1 MHz) Output Max Power 0.25 Watt for RL=50Ω Output Protection Short Circuit to Ground Output Impedance 50Ω Single 100Ω Differential Gain Settings 0 to 80 dB in 1 dB Steps Gain Accuracy ±0.2 dB Distortion @ 3.5 Vrms > 90 dB 1 kHz-10 kHz (at 0 dB Gain) Overload Light lights at ≈ 24 V p-p Transfer Function Bessel with Constant of Filters Delay in the Pass-Band Offset Voltage Adjustable to Zero Offset Voltage Range 0-60 dB Gain Setting ± 0.5 VDC 70 dB Gain Setting ± 1.5 VDC * Minimum Discernable Signal is that signal that makes the output of the 960 Amplifier increase by 3 dB when measured with a wideband (2 MHz) True RMS Voltmeter.
Models 960 & 960B Single Channel – Certified Specifications e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com Power Supply AC Line Power Operation 960 10 Watts max. 960B 15 Watts max. Voltage Frequency Range-Rear Panel:
115 V 105 to 125Vac @ 50/60Hz
230 V 210 to 250Vac @ 50Hz
Fuse 115 V=0.2 Amp., 230 V = 2X-0.1 Amp. Battery Operation (960B) Time for full Charge 10 – 12 hours Battery Life Approx. 500 Charge/Discharge Cycles Battery Charger Automatic Uninterruptible Charge Status Indicator (Front Panel) 3 Status Levels Battery Operation 8 Hours typ. Temperature Operating Temperature: 0 °C to +50 °C Storage Temperature: -25 °C to +70 °C Mechanical Dimensions 3.7"H x 8.66"W x 10.6"D 9.4cmH x 22.0cmW x 27.0cmD Weight 960 3.5 lbs; 1.58 kgs 960B 5.4 lbs; 2.45 kgs Case Material ABS plastic Color Light Gray A. AVAILABLE MODELS 1. 960* Standard AC powered model 1 2. 960B* AC powered with battery powered option 1 *Please specify if you want the internal notch filter at 60 Hz or 50 Hz. NOTE: 1. See page 3, item “Q” Voltage selector Module. At time of shipment, Voltage is pre- selected in the 115 V AC position. For 230 V AC operation, this module must be rotated 180 degrees and an additional fuse must be added. 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.