User`s guide

75
System Specifications
Reference Specifications
Reference Specifications
The accuracy needs for testing GSM radios require the unit to be operated with
the high stability reference (option 001) or an external high stability reference.
Accuracy (after warm up): ± [(Time since calibration x aging rate) +
temperature effects + accuracy of
calibration]
External reference input Frequency: 13, 10, 5, 2 or 1 MHz, ± 30 ppm
Level: 0 to +10 dBm
Supplemental characteristics
Nominal impedance: 50 ohm
10 MHz out (rear panel BNC) Level: > +8.0 dBm nominal
Impedance: 50 ohm nominal
13 MHz out (rear panel BNC) Level: > +8.0 dBm nominal
Impedance: 50 ohm nominal
Fixed reference mode
Aging: < 2 ppm/year
Temperature stability: ± 1 ppm (0˚ to 55˚C)
Warm-up time: < 30 minutes, ± 2 ppm of final frequency
Tunable reference mode
This allows offsetting the internal reference by a selected amount relative to the
high stability reference (option 001) or an external reference.
Required external reference accuracy: ± 0.5 ppm
Tune range: ± 30 ppm
Reference accuracy: ± 1 ppm + accuracy of external reference
or high stability (option 001)
Temperature stability: ≤ 4 ppm, for selected offsets of up to
± 30 ppm