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Differential AC Amplifier Model 1700

The Model 1700 includes:

  • Operator's manual and Rack mount hardware
  • Four 3-foot cables (5-pin connector on one end; Catalog#: 692000)

Please note that A-M Systems instruments are not approved for use with human subjects in either a clinical or research environment.

Catalog # Description Price Quantity
690000 Model 1700 Differential AC Amplifier, 110 V, 60 Hz $2,145.00 
Quantity:
690005 Model 1700 Differential AC Amplifier, 220 V, 50 Hz $2,145.00 
Quantity:
692200 Model 1700 Mini D/C Coupled Headstage $250.00 
Quantity:
749917 Extended Warranty, 2 Year, Model 1700 $225.00 
Quantity: 
694500 Modification fee for D/C Headstage $95.00 
Quantity:
701900 Headstage Input Connector Cable Set (for Models 1700 and 1800 Headstages) $25.00 
Quantity:



Summary

The Model 1700 Differential AC Amplifier is intended for research or teaching applications requiring extracellular neurophysiological recording from excitable tissue, such as nerve or muscle, and is camplable of making EMG, EEG, EKG and ERG recordings.

The Model 1700 contains 4 independent amplifiers plus a power supply in a single enclosure enabling several channels to be recorded simultaneously. Also, combining four amplifiers in a single instrument reduces the construction cost and these savings are passed on to you.

Each amplifier contains a high-gain, low-noise differential stage followed by low-frequency, high frequency, and notch filters. A connection is also provided for a stimulator input so that recording or stimulating through an electrode is possible.
  • Gain selections include x100, x1,000, and x10,000
  • Low noise (1.0 µV peak to peak)
  • High common-mode rejection (> 70 dB at 60 Hz)
  • High line frequency rejection with notch filter (>110 dB at 60 Hz)
  • High input impedance (100,000 MΩ)
  • Low input bias current (3 pA typical; 20 pA maximum)
  • Driven cable shield for reduced capacitance
  • Adjustable low and high frequency filters
  • Notch filter for 50 or 60 Hz interference
  • Power supply may be set for 110 VAC at 60 Hz or 220 VAC at 50 Hz
  • Includes standard 3 year warranty

Specifications

Noise
  • Voltage, fB = 10 Hz-10 kHz, typical: 1.0 µV, p-p
Offset Voltage
  • Average Drift , maximum: ± 30.0 µV/Deg C
Bias Current
  • Initial Bias Current, maximum: ± 0.4 nA
Offset Current
  • Input Offset Current, maximum: ± 0.4 nA
Input Impedance
  • 1012 Ω || 50 pF
Inter-channel Crosstalk
  • 90 dB at 1 kHz
Voltage Range
  • x100: .11 VAC or .11 VDC ± 5%
  • x1000: .011 VAC or .11 VDC ± 5%
  • x10000: .0011 VAC or .11 VDC ± 5%
  • Commmon Mode Rejection (CMR): 75 dB
Slew Rate
  • 2 V/µS
Rated Output
  • Voltage Output: ± 11 V
  • Current Output: 5 mA
  • Output Resistance: >5 Ωs
Low Cut-Off Filter
  • Cut-Off Frequencies: 0.1, 1.0, 10.0, 100, 300 Hz
  • Cut-Off Rate: 40 dB/decade
High Cut-Off Filter
  • Cut-Off Frequencies: 0.5, 1.0, 5.0, 10, 20 kHz
  • Cut-Off Rate: 40 dB/decade
Notch Filter
  • Center Frequency: 50 Hz or 60 Hz (factory preset)
  • Rejection: >35 dB

FAQ

The following is a list of commonly asked questions regarding this product. If you have any additional questions, please feel free to contact us at 800-426-1306 for further information.

  • Can I get a replacement Instruction Manual for this instrument?
  • Is it possible to have a Model 1700 amplifier customized for my preferred gain and filter settings?
  • Can I extend my input cables beyond the standard 3 feet using extension cables?
  • What are the major differences between the Model 1700 Differential Amplifier and the Model 1800 Microelectrode Amplifier?
  • Sometimes, My Model 1700 "stops working" when big noises are introduced in the signal, such as when we touch or move the electrodes. However, after a few minutes, it begins to operate properly. Should I have the unit repaired?
  • My Model 1700 is not working, but our university has an excellent electronics facility. Can we repair the unit ourselves?
  • Can I use this instrument outside of the United States?
  • What are the proper operating and storage conditions for my Model 1700?
  • Can I get a replacement Instruction Manual for this instrument?

    Additional Operator's Manuals are available for download by clicking on the 'Downloads' section from the menu bar at the top of this web page.

    Is it possible to have a Model 1700 amplifier customized for my preferred gain and filter settings?

    Yes, in most circumstances, we can easily customize at our factory any of our amplifiers' filter and/or gain settings. Please contact technical support (800-426-1306, or tech@a-msystems.com for more information.

    Can I extend my input cables beyond the standard 3 feet using extension cables?

    Yes, and no. The cable can be longer than the default 3 feet, but care needs to be taken in how you make the longer cable. Generally it is better not two splice two wires together to create a longer wire as this will introduce noise. You can increase the length of the cable by splicing another shielded twisted pair two conductor cable to the white input cable included with the instrument. Make sure all three electrical connections are made (shield, white wire, and black wire).

    The preferred solution is that instead of splicing two cables together, you order a new cable from us manufactured to your desired length (Maximum input length is limited to 12 feet because of noise and capacitance considerations). Contact our customer service department for more information.

    What are the major differences between the Model 1700 Differential Amplifier and the Model 1800 Microelectrode Amplifier?

    The 1700 has 4 channels and the 1800 has two. The 1800 comes with preamplifiers (probes, headstages) while the 1700 does not. Thus, while the 1700 and 1800 will work equally well in recording if you have electrodes that are 1M-ohm or less, recording with high impedance electrodes will require the headstage probe provided with the 1800. The Headstage eliminates signal losses due to long cables and the capacitance they generate. The 1800 can monitor an external stimulus being delivered through the recording electrode, while the 1700 can not. The 1800 has a built-in impedance measuring circuit, while the 1700 does not.

    Sometimes, My Model 1700 "stops working" when big noises are introduced in the signal, such as when we touch or move the electrodes. However, after a few minutes, it begins to operate properly. Should I have the unit repaired?

    The 1700 is AC-coupled. So if large shifts in DC potential occur (such as those generated by a large change in noise), it takes time for the capacitors involved in the AC coupling to charge up to the new DC value. After that, the recording will continue.

    My Model 1700 is not working, but our university has an excellent electronics facility. Can we repair the unit ourselves?

    It is recommended that A-M Systems perform the needed repairs as we are the most familiar with the units. However, if you are confident in your electronic technician's skills, you can always purchase the schematics for the Model 1700 from us (Cat#693000) and attempt them yourself.

    Please note that any user-attempted repairs during the warranty period may invalidate the warranty, and might invoke additional charges to correct them if A-M Systems is required to make repairs at a later date.

    Can I use this instrument outside of the United States?

    All of A-M Systems instruments can be modified to work outside of the United States. Typically, this modification is made at the factory (at no additional cost) prior to shipping to our customers. Just inform the customer service department where the instrument will be used, so our technicians can prepare the proper power supply modifications.

    What are the proper operating and storage conditions for my Model 1700?

    The Model 1700 is designed to be used under laboratory conditions. Operate in a clean, dry environment only. Do not operate in a damp environment. Temperatures for storage and operation should be between 5 °C and 40 °C. Storage should be indoors in a cool dry place.

    Headstage

    While not explicitly designed for use with a headstage, the Model 1700 can be modified to accept a headstage for a minimal charge.

    We can modify the unit to work with a headstage, however, this comes with a functional cost as well as an actual price increase. Functionally, putting a headstage on the front end of one of these units eliminates the ability to use the stimulation mode on that channel of the amplifier, thereby preventing the user from passing current to the site through the electrode. In addition, the headstage is a DC unit, thus the amplifier will saturate if the offset between the electrode and the reference is too large. In the modified units, this is 1V, which should still provide plenty of room to record most signals.

    When we modify a unit for use with a headstage, we decrease the gain on the inner channels by a factor of 10, so the overall gain remains as indicated on the switch labels. The modification consists of supplying power to drive the headstage, and this requires a slight circuit modification.

    Please contact us for an accurate price quote for the modification.

     

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