EMI test receiver R&S ESPI3 high quality high performance

I R&S ESPI3 EMI receiver :

Frequency range ESPI3 9 kHz to 3 GHz
R&S®
ESPI7 9 kHz to 7 GHz
Frequency resolution 0.01 Hz
Internal reference frequency (nominal) standard
Aging per year after 30 days of continuous operation 1 × 10-6
Temperature drift +5 °C to +45 °C 1 × 10-6
Internal reference frequency (nominal) R&S®
FSP-B4 option (OCXO)
Aging per year after 30 days of continuous operation 1 × 10-7
Temperature drift +5 °C to +45 °C 1 × 10-8
External reference frequency 10 MHz
Frequency display (receiver mode) numeric display
Resolution 0.1 Hz
Frequency display (analyzer mode) with marker or frequency counter
Marker resolution span/500
Max. deviation sweep time > 3 × auto sweep time ±(marker frequency × reference frequency
error + 0.5 % × span + 10 % × resolution
bandwidth + ½ (last digit))
Frequency counter resolution selectable 0.1 Hz to 10 kHz
Count accuracy S/N > 25 dB ±(marker frequency × reference frequency
error + ½ (last digit))
R&S® Display range of frequency axis ESPI3 0 Hz, 10 Hz to 3 GHz
R&S®
ESPI7 0 Hz, 10 Hz to 7 GHz
Max. deviation of display range 0.1 %
f = 500 MHz, for f > 500 MHz see diagram
100 Hz <–84 dBc (1 Hz), typ. –90 dBc (1 Hz)
1 kHz <–100 dBc (1 Hz), typ. –108 dBc (1 Hz)
10 kHz <–106 dBc (1 Hz), typ. –113 dBc (1 Hz)
100 kHz, span > 100 kHz <–110 dBc (1 Hz), typ. –113 dBc (1 Hz)
1 MHz, span > 100 kHz <–120 dBc (1 Hz), typ. –125 dBc (1 Hz)
Spectral purity, SSB phase noise
10 MHz typ. –145 dBc (1 Hz)
Residual FM f = 500 MHz, RBW = 1 kHz,
sweep time = 100 ms
typ. 3 Hz