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Polarographic Amplifier Model 1900

The Model 1900 includes:

  • Operator's manual
  • Rack mount hardware

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
730000 Model 1900 Polarographic Amplifier $1,400.00 
Quantity:
749919 Extended Warranty, 2 Year, Model 1900 $225.00 
Quantity: 



Summary

The Model 1900 Polarographic Amplifier has been specifically designed for low noise, precise amperometric measurements. The features of this research instrument easily permit the use of a wide range of commercial polarographic oxygen sensors.
  • Low noise
  • Can use both Hydrogen and Oxygen sensors
  • Wide response range
  • Excellent resolution
  • Full scale digital panel meter displays current, mm Hg, x10, %, and %x10 outputs
  • Internal/external gateable electrode polarization
  • Single-ended or differential measurement
The wide response range of the Model 1900 extends all the way from 100 pA up to 1 uA with 100% overrange on all scales. On its most sensitive scale, the resolution is 0.1 pA. The amplifier output is displayed on the front panel digital meter, and is available from a BNC connector for chart recorders, polygraphs, A/D converters or other display devices. Accuracy, ease-of-use, and recording flexibility are design features for the researcher’s satisfaction.

No headstage is required to achieve the 0.1 pA sensitivity, reducing the congestion at the electrode measurement site. The input connections are made conveniently through standard BNC connections. The front panel scale adjustment does not require zero current readjustment when there is a change in scale, reducing instrument set-up time. The digital meter display is switch selectable for mmHg, percent (x1 or expanded x10), or absolute current. The instrument gain automatically adjusts for polarity of the polarization voltage, even for an external polarization input.

The maximum input bias current is less than 1 pA at normal room temperature. With the 10-turn potentiometer knob, the Zero Current control can be used to eliminate this input bias current of the polarographic sensor at 0% oxygen. The Zero Current can be turned off to determine the absolute current level. This is a convenient way to check electrode resistance.

The amplifier offers two polarization voltage methods. One is from the instrument’s internal source set by the Internal Voltage knob; the other is from an external source into the Ext In BNC connector. A novel feature for the external source is that a variety of polarization waveforms may be used. The display meter can be switched to monitor the polarization voltage. The voltage can also be monitored via the Monitor Out BNC connector. An external GATE signal may be used to switch on or off the polarization voltage applied to the electrode, for further experimental control.

The Model 1900 has been designed to minimize the effects of artifacts and noise. While for many applications a single-ended sensor input may be adequate, differential measurements may also be made. Built-in low pass and notch filters further reduce spurious noise. The instrument has features to withstand the rigors of a research environment, with protection against normal static or DC overvoltages.

Specifications

  • Low noise, precise polarographic amplifier
  • Able to be used with both oxygen and hydrogen sensors
  • Wide response range from 0.1 nA to 1,000 nA
  • Excellent resolution to 0.1 pA
  • Full scale digital panel meter display shows current, mmHg, mmHg x 10, %, or % x 10
  • Internal/external gateable electrode polarization
  • Single-ended or differential measurements possible

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?
  • My Model 1900 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 1900?
  • 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.

    My Model 1900 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 1900 from us 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 1900?

    The Model 1900 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.

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