The Model 855 series is a phase coherent multi-output fast switching and low phase noise signal generator with a frequency range from 10 MHz to 6.2, 12.5, or 20.0 GHz. The 855 is ideally suited for a variety of applications where good signal quality and a wide, accurate output power range are required. Excellent phase noise is combined with spurious and harmonic rejection. A high-stability OCXO reference provides excellent frequency accuracy and stability. The generator accepts external 10, 100, or 1000 MHz references.
The Model 855 series comes in standard 19 inch 1U (up to 4 channels) or 3U (up to 8 channels) enclosure and offers various control interfaces such as USB, LAN, or GPIB. Each interface allows easy and fast communication using SCPI 1999 command set. Remote control of the instrument can be quickly attained from any host computer using a free and intuitive GUI. in addition, a customer-supplied application programming interface (API) or programming examples for Matlab, Labview, C++, and other commercially available tools make implementation very straightforward.
Parameter
| Min. | Typ. | Max. | Note |
Frequency range | 100kHz 100kHz 100kHz | 6.0GHz 12.5GHz 20.0GHz | 855-6 855-12 855-20 | |
Resolution | 1Hz | |||
Switching speed Frequency/Amplitude settling time | 0.01ms | 0.02ms 0.015ms | ||
Phase Range | 0 deg | 360 deg | Individually adjustable per channel | |
Phase Resolution | 0.1 deg | |||
SSB Phase noise at 1 GHz | ||||
At 10 Hz from carrier 20 kHz 100 kHz | -105 dBc/Hz -137 dBc/Hz -140 dBc/Hz | Scales with frequency at 20 dB/dec | ||
Power Level | ||||
Range | -20 dBm -20 dBm -20 dBm -20 dBm | +20 dBm +25 dBm +23 dBm +22 dBm | 1 to 10 MHz 10 Mhz to 6 GHz 6 to 15 GHz 15 to 20 GHz | |
Range with option PE4 | -80 dBm -80 dBm -80 dBm | +20 dBm +18 dBm +15 dBm | Settable to -90 dBm 0.1 to 12 GHz 12 to 15 GHz 15 to 20 GHz | |
Resolution | 0.01 dB | |||
Thermal drift | 0.015 dB/ deg C | |||
Level uncertainty | 0.25 dB ±3.5 dB | ±1.0dB ±2.0dB | -20 dBm to Pmax Option PE4, -60 TO -20 dBm Option PE4, <-60 dBm | |
Output impedance | 50 Ohms | |||
VSWR | 1.8 | |||
Reverse Power Protection | ||||
DC Voltage | 15V | |||
RF power | +26 dBm | |||
Spectral purity Output harmonics | -30 dBc -40 dBc -50 dBc | -25 dBc -30 dBc -35 dBc | At + 10 dBm output power <100MHz 0.1 to 7 GHz >7G Hz | |
Non-harmonic spurious | -75 dBc | Offsets > 1kHz |
