Help with Scalar Network Analyzers specifications:
Instrument Type
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| Instrument Type: | |||
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| Portable / Benchtop Instrument | Portable or benchtop instruments can be moved with relative easy for a variety of uses. They include a case or handle, but are not necessarily hand held. | ||
| Fixed Instrument | Fixed instruments are kept in one location and are meant to be used in one place. They are usually stand-alone devices. | ||
| PC-Based Instrument / Module | PC-based or "black box" instruments and modules do not include an integral display, but interface to a computer. They typically plug into the backplane or motherboard, or otherwise interface directly with the computer bus. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Performance Specifications
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| Frequency Range | Network analyzers measure an application’s fundamental frequencies, harmonics or spurious signals on the high end, and baseband or intermediate frequency (IF) signals on the low end. Applications such as wireless communications require higher frequency capabilities. Some cellular standards require measurements to the tenth harmonic. For example, applications at 900 MHz require a network analyzer with a high frequency of 10 * 900 MHz for a total of 9 GHz. For RF signals, network analyzers must be able to measure lower frequency baseband and IF signals. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Frequency Accuracy | Frequency accuracy is usually specified as the sum of several sources of errors, including frequency-reference inaccuracy, span error, and resolution bandwidth (RBW) center-frequency error. Frequency-reference accuracy is determined by the basic architecture of the analyzer. The quality of the instrument's internal time-base is also a factor; however, many network analyzers use an oven-ized, high-performance crystal oscillator. | ||
| Search Logic: | All matching products will have a value less than or equal to the specified value. | ||
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| Frequency Resolution | Frequency resolution is an important specification for applications that measure signals that are close together and need to be distinguished from one other. The IF filter bandwidth is called the resolution bandwidth (RBW) because the shape and bandwidth of the IF filter determines the resolvability between signals. In addition to filter bandwidth, the selectivity, filter type, residual frequency modulation (FM) and noise sidebands are important factors to consider in determining useful resolution. | ||
| Search Logic: | All matching products will have a value less than or equal to the specified value. | ||
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| Output Power Range | The 1-dB compression point is sometimes defined as the output power (as opposed to input power) that results in a 1-dB decrease in amplifier gain. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Nominal Input Impedance: |
Nominal input impedance is the amount of load that an input places on the signal source that drives the load. High input impedance is generally desirable and implies that little change in the signal is expected when the circuit is connected. The most common input impedances are 50  and 75 .
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50
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The nominal input impedance is 50 .
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75
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The nominal input impedance is 75 .
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| Other | Other unlisted nominal impedance. | ||
| Search Logic: | Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Connection to Host
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| Connection to Host | |||
| Your choices are... | |||
| Direct Backplane Interface | The circuit board installs directly into a computer motherboard or backplane. | ||
| RS232 | RS232 is an interface between data terminal equipment and data communications equipment that uses a serial, binary data interchange. | ||
| RS422 | RS422 is a balanced serial interface for the transmission of digital data. It was designed for greater distances and higher Baud rates than RS232. | ||
| RS485 | RS485 is a balanced serial interface for the transmission of digital data. The advantage of a balanced signal is the greater immunity to noise. The difference between RS422 and RS485 is that RS485 can be transformed into a multi-point application. | ||
| USB | Universal serial bus (USB) is a 4-wire, 12-Mbps serial bus for low-to-medium speed peripheral device connections to personal computers (PC), including keyboards, mice, modems, printers, joysticks, audio functions, monitor controls, etc. The USB design is standardized by the USB Implementers Forum (USBIF), an organization that includes leading companies from the computer and electronics industries. The current USB specification is USB 2.0, which supports data transfer rates of up to 480 Mbps. | ||
| IEEE 1394 (FireWire®) | IEEE 1394 or FireWire® is an interface standard adopted by the Institute of Electrical and Electronics Engineers (IEEE) for very fast digital data transfers such as streaming video. IEEE 1394 connectors are used to transmit and receive data among FireWire devices, and are designed to replace external high-speed peripheral connections to personal computers, including hard disks, CD-ROMs, DVDs, graphics cards, high-speed scanners, direct video, monitors, etc. Tiny, robust FireWire connectors will also become important parts of home entertainment, communication, and appliance networks. FireWire is a registered trademark of Apple Computer, Inc. | ||
| GPIB (IEEE 488, HPIB) | The general-purpose interface bus (GPIB) is designed to connect computers, peripherals and laboratory instruments so that data and control information can pass between them. It was originally developed by Hewlett Packard (HP) and called the HPIB bus. GPIB is also know as the IEEE 488 bus, and is electrically equivalent to the IEC 625 bus. | ||
| SCSI | Small computer systems interface (SCSI) is an intelligent I/O parallel peripheral bus with a standard, device-independent protocol that allows many peripheral devices to be connected to the SCSI port. A single SCSI bus can drive up to eight devices or units: the host adapter or controller, and seven other devices. Each device is assigned a different SCSI ID, ranging from 0 to 7. SCSI formats include SCSI-1, SCSI-2, SCSI-3, Wide SCSI, Fast SCSI, Wide Fast SCSI, Ultra SCSI, Ultra2 SCSI, Ultra3 SCI (Ultra160), Ultra 320 SCSI, and Ultra640 SCSI. | ||
| TTL | Transistor-transistor logic (TTL) is a common type of digital circuit in which the output is derived from two transistors. | ||
| Parallel Interface | Parallel channels can transfer more than one bit simultaneously. They connect to a computer through a parallel port. Common protocols include standard parallel port (SPP) and enhanced parallel port (EPP). | ||
| Ethernet | Ethernet is a local area network (LAN) protocol that uses a bus or star typology and supports data transfer rates of 10 Mbps. The Ethernet specification is the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers. To handle simultaneous demands, Ethernet uses carrier sense multiple access / collision detection (CSMA/CD) to monitor network traffic. | ||
| Modem | A modulator-demodulator (modem) is a device or program that enables a computer to transmit data over telephone lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves. A modem converts information between these two forms. | ||
| Radio / Telemetry | Communication from a data acquisition device to a host or storage unit is achieved via radio transmission. | ||
| Other | Other unlisted, specialized, or proprietary communication configuration. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Memory and Storage
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| Floppy Disk? | Devices include a 5¼" floppy drive or 3½"diskette drive. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| CD Drive? | Devices include a compact disc (CD) drive for loading programs or storing data. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Tape Drive / Backup? | Devices include a tape drive for data storage or backup. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Display Options
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| Display Options: | |||
| Your choices are... | |||
| Analog Meter | Data is displayed with an analog meter or simple visual indicator. | ||
| Digital Readout | Devices use a numeric or application-specific display. | ||
| Video Display | Data is presented in video form via a cathode ray tube (CRT), liquid crystal display (LCD), or other multi-line form. | ||
| None | Devices do not include an integral display. The output is read and displayed remotely. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Environment
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| Operating Temperature | This is the full required range of ambient operating temperature. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Operating Humidity | This is the full required range of ambient operating humidity. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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