Universal Counter 3GHz, 3-Channel, R&S ID 3593.0545k02, with RS-232/USB Dual Interface. The R&S HM8123 is an Universal Counter with a measurement range DC to 3 GHz, has 3 channels and offers precise time and frequency measurements for versatile test and analyzer functions. Measurement range: DC to 3 GHz Input A/B (BNC): DC to 200 MHz Input C (SMA): 100 MHz to 3 GHz Input impedance: A/B: 50 ohm or 1 Mohm switchable, sensitivity: 25 mV C: 50 ohm, sensitivity: 30 mV Resolution (at 10 s gate time): 10 digits Time base: 400 MHz with 0.5 ppm stability TCXO temperature stability: +/- 0.5 x 10e-6 External reference input/output: 10 MHz (via BNC-connector) 9 measurement functions, external gate and arming connectors (BNC) Display-modes: Numeric, historgrams, trend plots Intuitive operation Fanless design RS-232/USB dual interface IEEE-488 interface (optional) Dimension (WxHxD): 285 x 75 x 365 mm Weight: approx. 4 kg