Agilent 8648C signal generator upgraded to 4 GHz 1E5
serial 5274
Frequency 9 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
Has option : 1E5 Oven timebase
VFD display