Atec Rohde-Schwarz-CMW500 - Manual (Page 17)

Version 11.00, May 2013
Rohde & Schwarz R&S ® CMW500 Wideband Radio Communication Tester 17
Timebase
Timebase TCXO
Max. frequency drift in temperature range +5 °C to +45 °C ±1 × 10 –6
Max. aging at +25 °C,
after 14 days of continuous operation ±1 × 10 –6 /year
Timebase basic OCXO (R&S ® CMW-B690A option)
Max. frequency drift in temperature range +5 °C to +45 °C ±5 × 10 –8
Retrace at +25 °C,
after 24 hours power on /
2 hours power off / 1 hour power on ±2 × 10 –8
Max. aging at +25 °C,
after 10 days of continuous operation ±1 × 10 –7 /year,
±1 × 10 –9 /day
Warm-up time at +25 °C,
the frequency is in the range that is
10 times the frequency drift (±5 × 10
–7 )
approx. 10 min
Timebase highly stable OCXO (R&S ® CMW-B690B option)
Max. frequency drift in temperature range +5 °C to +45 °C,
referenced to +25 °C ±5 × 10 –9
with instrument orientation ±1 × 10 –9
Retrace at +25 °C,
after 24 hours power on /
2 hours power off / 1 hour power on ±5 × 10 –9
Max. aging at +25 °C,
after 10 days of continuous operation ±3 × 10 –8 /year,
±5 × 10 –10 /day
Warm-up time at +25 °C,
the frequency is in the range that is
10 times the frequency drift (±5 × 10
–8 )
approx. 10 min
Reference frequency inputs/outputs
Synchronization input BNC connector REF IN, rear panel
Frequency sine wave 10 MHz to 80 MHz, step: 1 Hz
square wave (TTL level) 1 MHz to 80 MHz, step: 1 Hz
Max. frequency variation ±10 × 10 –6
Input voltage range 0.5 V to 2 V, RMS
Impedance 50 Ω
Synchronization output 1 BNC connector REF OUT 1, rear panel
Frequency 10 MHz from internal reference or
frequency at synchronization input
Output voltage > 1.4 V, peak-to-peak
Impedance 50 Ω