Hãng sản xuất: BK Precision - USA Model: 1823A Range 0.1 Hz - 2.4 GHz Frequency: yes Totalize: yes Period: yes Time Base Stability: ±1ppm Best Resolution: 1 nHz No. of Digits: 9 Display Hold: yes Low Pass Filter: yes Sensitivity: 250 mV (0.1 Hz - 1 Hz), 30 mV (1 Hz - 100 MHz), 25 mV (80 MHz - 150 MHz), 20 mV (150 MHz - 2.0 GHz), 60 mV (2.0 GHz - 2.4 GHz) Remote Interface: RS232 Self-Test: yes Time Interval Measurement: yes Frequency Ratio Measurement : yes Input Power: 115/230 V (50/60 Hz) Weight: 5.5 lbs (2.5 kg) Dimensions: 239 x 89 x 269 mm