HP8921A综合测试仪　AM/FM signal generatorAM/FM modulation analyzerDuplex offset generatorRF power meterRF frequency counter/frequency error meterAudio frequency counter and power meterAC/DC voltmeterSINAD/SNR/distortion meterTwo variable frequency AF generatorsDigital oscilloscopeBuilt-in IBASIC controllerSpectrum analyzer with tracking generatorAdjacent channel power meterSignaling encoder and decoderHigh-stability timebaseDC current meterHP-IB/RS-232/parallel remote interfacesUpgradability to TDMA CDMA CDPD or PCS test capabilityThe HP 8921A cell site test set is a highly-portable integrated solution for the installation and maintenance of AMPS and TACS cell sites. The HP 8921A incorporates more than twenty powerful instruments into a compact 38-pound package. The integral IBASIC controller in the HP 8921A runs the HP 11807B cell site test software to fully automate base station test and adjustment procedures. Automation combined with accurate measurements increases technician efficiency to speed installation and maintenance procedures.UPGRADING FOR NEW FORMATS Beyond testing analog AMPS and TACS base stations the HP 8921A is ready to grow with your measurement needs for digital cellular systems with upgrades available for:TDMACDMACDPDPCS (17170-1990 mHz)HIGH-PERFORMANCE SPECTRUM ANALYZER The spectrum analyzer of the HP 8921A has the wide dynamic range and synthesized frequency accuracy previously found only in expensive stand-alone spectrum analyzers. Wide dynamic range allows the HP 8921A to locate low level signals in the presence of high power transmitters. Synthesized frequency accuracy translates into high confidence that you&ve located the correct signals.With frequency spans ranging from 1 GHz to as narrow as 5 kHz the HP 8921A has the flexibility to look at the entire RF spectrum and then zoom in on the desired signals. The marker function displays the frequency and amplitude of any displayed signal. The marker-to-peak function displays the frequency and amplitude of the largest on-screen signal with a single keystroke.BUILT-IN TRACKING GENERATOR The HP 8921A spectrum analyzer also includes a built-in tracking generator for tuning base station duplexers. With +13 dBm power output (over range) use the tracking generator as an input stimulus to the duplexer. The calibrated level of the spectrum analyze ensures accurate adjustment of duplexers. Using the marker function of the spectrum analyzer the rejection of the duplexer can be measured at any point of the filter response. Antenna return loss can be quickly and accurately measured onsite with the HP 8921A tracking generator. Using the tracking generator to drive the antenna through an external VSWR bridge the reflected power can be measured on the HP 8921A spectrum analyzer. Other measurements performed with the tracking generator include insertion loss and frequency response of filters cables or attenuators. The tracking generator features calibrated output level from -137 to +7 dBm and variable frequency offset for IF to RF conversion measurements. Coupled with 1 2 and 10 dB per division spectrum analyzer ranges normalization and marker capability the tracking generator makes the HP 8921A ideal for all types of measurements and adjustments.AUTOMATED base STATION MAINTENANCE For complex base station maintenance the HP 11807B cell site test software running on the HP 8921A&s internal controller guides the user through each step of the procedure. Graphical displays show connection diagrams and highlight key adjustment points when required. Technicians spend less time learning and more time testing with the HP 8921A cell site test set.Another software package the HP 11807B Option 120 provides AMPS system information. The software uses the HP 8921A to scan for and decode local control channels display system data and measure key transmitter characteristics.