特点 ·PDC标准STD-27B/C测量 ·高精度测量 ·紧缩式、轻便型设计 ·用于高生产量时的高速度测量 单一单元用于发射机和接收机测量 技术指标 OCXO referemce oscillator Temperatureeffect (O to 45℃) 110^-7 Aging (35℃) 210^-7/year DC voltmeter 0 to ±30 V DC ammeter 0to ±10A Operating modes currentaveraging with PDC-adapted time constant,peak current measure-ment (positive andnegative) Common-mode rejection ±30V Resistance 50 mΩ Receiver measurements RFgenerator Frequency ranges 810 to 826 MHz 860 to 885 MHz 1477 to 1501 MHz Channelspacing 25 kHz Resolution 1Hz Frdquency drift sameas reference frequency Outputlevel RF IN/OUT RF OUT 2 -119 to -27 dBm -70 to 0 dBm Resolutionof level setting 0.1 dB Level accuracy RF IN/OUT RF OUT 2 ±1.5 dB ±2 dB Carrier offset -25dBc Vectcr error 4°rms Modulation to RCR-STD27 Signal purity Adjacent-channelleakage power (BW=21 kHz) -50 dB(50 kHz carrier offset) -60 dB(100 kHz carrier offset) Harmonics -20 dBc BER measurements Synchronizationrange 0 to 10% fter synchronization 0 to 25% Resolution 0.01% Measured bit length 2240to 44800 Input transmission rate -50kbit/s Transmitter measurements Receive section Frequencyranges 915 to 956 MHz 1429to 1453 MHz Channel spacing 25kHz Frequency drift sameas reference