Frequency range: 9 kHz to 40 GHz Frequency resolution: 0.01 Hz Reference frequency, internal nominal External reference frequency: 10 MHz Frequency display: with marker or frequency counter Marker resolution: span/500 Max deviation (sweep time > 3⋅x auto sweep time): ± ( frequency x reference accuracy + 0.5% x span + 10% x RBW + 1/2 LSD ) Frequency counter resolution: 0.1 Hz to 10 kHz (selectable) Count accuracy (S/N >25 dB): ± (frequency x reference error + 1/2 (last digit)) Frequency span: 0 Hz, 10 Hz to 40 GHz Max span deviation: 0.1%