Le Croy DA1822A Differential Amplifier, US $2,500.00 – Picture 0

Le Croy DA1822A Differential Amplifier, US $2,500.00 – Picture 1

Le Croy DA1822A Differential Amplifier, US $2,500.00 – Picture 2

Le Croy Da1822a Differential Amplifier

US $2,500.00

Maynard, Massachusetts, United States
Feb 13th

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Leading Features DC to 10 MHz Bandwidth 100,000 to 1 CMRR Gain of 1, 10, 100 & 1000 Full Upper & Lower Bandwidth Limits The DA1820A/1822 is a stand-alone, high-performance 10 MHz differential amplifier. It is intended to act as a signal conditioning preamplifier for oscilloscopes and network and spectrum analyzers, providing differential measurement capability to instruments having only a single-ended input. Amplifier gain can be set to 1, 10, 100 or 1000. The high gain of the DA1822A can extend the sensitivity of a scope with 2 mV/div to 2 ?V/div. A built-in input attenuator can be separately set to attenuate signals by a factor of 10, allowing gains of 1000, 100, 10, 1, or 0.1 and common mode dynamic range of ± 15.5 V (? 1) or ± 155 V (? 10). Optional probes further increase the maximum input signal and common mode ranges in proportion to their attenuation ratio, but not exceeding the probe's maximum input voltage rating. Effective gain of the DA1822A, including probe attenuation, amplifier gain and attenuator settings, is automatically displayed. The DA1820A/1822 have a bandwidth of DC to 10 MHz, but the operator can select from a full complement of high- and low-frequency -3 dB points. In critical measurements, the signal-to-noise ratio can be greatly improved by restricting the amplifier bandwidth to the frequency range of interest. The DA1822A features a built-in Precision Voltage Generator (PVG) that can be set to any voltage between ± 15.5 volts (± 10 volts in Differential Offset) with up to 51/2 digit resolution. The PVG's output can be selected as an input to the inverting (-) input of the amplifier for operation as a differential comparator or applied internally as a true differential offset voltage. The voltage is also available to be used externally through a rear panel connector. The PVG is not included in the model 1820. The DA1820A/1822 operate from 100 to 250 V AC line without line switching. A wide range of high-performance differential probes are available for use with the DA1820A/1822. These include the DXC100A selectable (? 10/? 100) attenuation probes, the DXC350A ? 100 high- impedance (92 meg/2.4 pF) probe and the ? 1 DXC200A probes. Comparator Mode (DA1822A only) The DA1822A becomes a differential comparator when the internal Precision Voltage Generator (PVG) output is selected as the amplifier's inverting (-) input. In this mode, the DA1822A can be used to very accurately measure relatively small signals that are riding on large AC or DC components. Due to the precision and 51/2 digit resolution of the voltage generator, an oscilloscope, when used with the DA1822A, can make voltage measurements that are much more accurate than the oscilloscope is capable of by itself. The output of the PVG is available for external use via a rear-panel connector. When used in the comparison mode, the DA1822A's "-" Input is connected to the output of the PVG, and the DA1822A's "-" Input probe is no longer used. The operator can then use the PVG as a very accurate position or offset control to compare to the PVG's value with any point on the "+" Input signal. The decimal point in the PVG readout is automatically positioned to account for the DA1822A's attenuator and any probe attenuation. True Differential Offset Mode The built-in PVG can be used to generate a true differential offset while still allowing both inputs to be used as differential inputs. Operation in the differential offset mode is very similar to that of the comparison mode, except the "-" Input of the DA1820A/1822 is still functional. In this mode, the output of the PVG is used to generate an offset within the DA1822A's amplifier (an external voltage can be supplied to the DA1820A). The PVG now functions as if a zero impedance adjustable voltage source were placed in series with the "-" Input. The decimal point in the PVG readout is automatically placed to account for DA1822A attenuator and probe attenuation factors as well as the DA1822A's gain setting. This mode facilitates making measurements such as changes to a transistor's base to emitter voltage caused by variations in temperature and/or current. Used in this mode, the voltage generator can be set to a value that will zero out the static value of the junction's on voltage. The DA1822A's differential measurement capability will reject any dynamic signal common to both sides of the junction, and the oscilloscope is left to measure only the changes in the junction voltage. Precision Voltage Generator (DA1822A only) The Precision Voltage Generator is controlled from the oscilloscope offset knob. Each digit can be individually incremented or decremented and rollover automatically carries to the next digit. The range of the generator is ± 15.5 V for the comparator mode and ± 10.0 V for differential offset mode. This range is multiplied by the attenuation factor of the probes and internal attenuator. The generator's temperature-controlled oven allows for a DC accuracy specification of 0.05% +500 ?V. The DA1820A/1822 input is protected to ± 250 V and will automatically disconnect large signals. Upper & Lower Bandwidth Limits The DA1820A/1822 allows the user to select both the upper and lower frequency -3 dB points. Selections for the high frequency -3 dB points are 3 MHz, 1 MHz, 300 kHz, 100 kHz, 30 kHz, 10 kHz, 3 kHz, 1 kHz, 300 Hz, and 100 Hz. Selections for the lower frequency -3 dB points are 0.1 Hz, 1 Hz, 10 Hz, 100 Hz, and 1 kHz. These filters make it possible to improve the signal-to-noise ratio when making measurements on microvolt magnitude signals. Autobalance Each time any of the gain buttons is pressed, the DA1820A/1822 adjusts the amplifiers DC balance.

“The unit is used, but in excellent condition. Was working when taking out of service. The unit may need to be calibrated. Sold as is.”

Brand	Le Croy
Model	DA1822A Differential Amplifier