Agilent/HP / Level Meter / 3586B/004 
Frequency range signal inputs: 
75 Ω unbalanced: 200 Hz to 32.5 MHz (connector: WECO 439/440A) 
124 Ω balanced: 4 kHz to 10 MHz (connector: WECO 443A) 
135 Ω balanced: 4 kHz to 1 MHz (connector: WECO 241A)  
600 Ω balanced: 100 Hz to 108 kHz (connector: WECO 310)

Frequency resolution: 0.1 Hz 

Frequency display: 9 digit LED 

Amplitude measurement range: +25 to -120 dBm 

Amplitude resolution: .01 dB 

Dynamic range: 
Image rejection (100-132 MHz): -80 dBc 
IF rejection: 15625 Hz: -80 dBc; 50 MHz: -60 dBc 
Non-Harmonic spurious signals: >1600 Hz offset: -80 dBc; 300 Hz to 1600 Hz offset: -75 dBc 
Residual spurious signals: ≥350 Hz: -115 dBm; <350 Hz: -100 dBm 
Harmonic distortion: 70 dB below full scale: >4 kHz on 75 Ω and 600 Ω inputs, Low Distortion Mode

Noise level: As low as -120 dBm