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Производитель: Agilent Technologies Размер: 2.58 mb Название файла: Язык инструкции:

Similarly the ReadMeLinux file gives the list of files corresponding to that installation. 3. Product Description 3.1. Overview DEMUX256K Acq MemPCI Interface 10- bit SH + ADCTIMEBASETRIGGERcircuit CardControllerThr DAC Input Signal Amplifier Trigger Signal Amplifier 10-bitPCI Bus Signal Input trigger Input 50 Ohms 50 Ohms Cal DAC Simplified Block Diagram once for each channel The 10-bit DC series products are CompactPCI/PXI compliant and require an appropriate CompactPCI crate. The digitizers are all fully programmable over the PCI bus and deliver oscilloscope-like performance. Data captured by the digitizers can be transferred to a host processor, either in the PC, in the crate, or interfaced to the crate, over the PCI bus. The 6U units (DC222, DC252, and DC282) can operate at 64-bit . 66 MHz with peak transfer speeds approaching 500 MB/s. The 3U units (DC122 and DC152) work at 32-bit . 33 MHz. The digitizers occupy a single slot of a 3U or 6U CompactPCI crate and they comply with the 3U or 6U CompactPCI standard (PXI compliant). Acqiris digitizers are designed to provide superior measurement precision and accuracy. Key acquisition specifications (such as DC accuracy, integral and differential non-linearity) have been optimized to deliver maximum measurement fidelity. Careful circuit layout, custom IC’s and special packaging techniques have all been employed to reduce overall system noise. The use of custom IC’s also dramatically reduces the total number of discrete components required. This has tremendous benefits on reliability and also allows the modules to use a minimal amount of power. For complete technical specifications concerning your particular digitizer please refer to the product’s Specifications & Characteristics. In addition, we maintain up-to-date versions of all product data sheets on our web site (The data sheets are available in pdf format and are best viewed using Adobe Acrobat software. If you have trouble accessing our web site, or viewing the data sheets, please contact your nearest sales office. 3.2. Channel Input The 10-bit digitizer family can be configured with a variety of front-end mezzanine boards offering different capabilities. The currently available front end options are detailed below: Front End Option Impedance Bandwidth Guaranteed (typical) / Risetime BW Limiter selections FS Voltage Ranges Maximum Offset / Max. Voltage Standard (Std) 50 . 2 GHz 0.17 ns 20, 200, 700 MHz 0.05 – 5.0 V ± 5 V ± 5 V High- Impedance (HZ) 50 . 950 MHz ( 1 GHz) 0.35 ns 20, 200, 700 MHz 0.05 – 5.0 V ± 5 V ± 5 V 1 M. (300 MHz) 1.2 ns 20, 200, 700 MHz (see remark below) 0.05 – 50 V ± 20 V (> 0.5 V FS) ± 200 V (> 5V FS) ± 300 V High- Frequency (HF) 50 . 3 GHz 0.12 ns 1 V ± 0.5 V ± 2 V A given unit’s model number will indicate which front end option is installed. If nothing follows the number itself then the standard front end option is present. Units with either Standard or HF front end options can be ordered with BNC or SMA connectors. The HZ units use BNC connectors. For FS > 5 V only the 20 MHz Bandwidth Limiter is available. 3.2.1. Standard & High Impedance Coupling Both AC and DC coupling modes are available. The AC mode couples signals capacitively thus removing the input signal’s DC component and filtering out any signal component below 16 Hz for the HZ option or 32 Hz for the Std option. DC mode allows all signal components to be passed through to the digitizer. 3.2.2. Impedance The input channels of the 10-bit Digitizer Family offer termination in either 50 . or 1 M.. The 50 . coupling mode for the Standard and High-Impedance front ends offers high quality termination with better than ± 1% precision. It is ideally suited to use with 50 . transmission lines (coax), high bandwidth low impedance (typically 500 .) probes or active probes. The HF 50 . coupling mode has ± 2% precision The 1 M. coupling mode provides a high impedance (low load) capability that is suited for use with most standard high impedance probes. The high impedance mode also features low (14 pF typical) capacitance that helps to minimize loading effects that can occur when probing high frequency circuits. 3.2.3. Input Protection The input amplifiers are protected against over-voltage signals as shown in the table. The High-impedance limit refers to the input signal’s DC + peak AC < 10 KHz voltage. 3.2.4. Mezzanine Front-end The front-end electronics are all mounted on a removable mezzanine card. In the event of accidental damage or as components fatigue over time (e.g. relays in high duty cycle automated testing applications), the mezzanine card allows for fast and efficient replacement. 3.2.5. Bandwidth and Rise Time The bandwidth specification indicates the frequency at which an input signal will be attenuated by 3 dB (approximately 30% loss of amplitude). The bandwidth also affects the minimum rise and fall times that can be passed through the front-end electronics. A pulse with a very sharp edge will b...

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