Hewlett Packard 8648B signal generator upgraded to 4 GHz
serial 0960
Frequency 100 kHz tot 4000 MHz
Resolution 1 Hz ( 10 Hz on display )
Amplitude -137 dBm to +13 dBm in steps of 0.1 dB
Modulation AM, FM, PM  external AC,DC, 400 Hz, 1 kHz
50 Watt reverse power protection
GPIB interface
No Options
Modulation AM 400, AM 1000, FM 400, FM 1000, PM 400, PM 1000 see pictures
LCD display
HF modules has been replaced by more recent ones
No further testing
No cables included
Hewlett Packard Agilent Keysight