Model	Low end frequency limit	High end frequency limit	Phase Angle Range	Accuracy	Resolution	Voltage Range
2251	30 Hz	54 kHz	0.00° - 360.00° or ±180.00°	0.01°	0.01°	20 mVrms to 300 Vrms
2000	10 mHz	700 kHz	±180.00° or 0.00 - 360.0°	±0.02°	±0.01°	0.001 Vpk to 500 Vpk
227	10 Hz	100 kHz	?	0.10°	0.10°	3 mVrms to 300 Vrms
2251	30 Hz	54 kHz	0.00° - 360.00° or ±180.00°	0.01°	0.01°	20 mVrms to 300 Vrms
2250	10 Hz	100 kHz	0.00° - 360.00° or ±180.00°	±0.05°	0.01°	300 Vrms Max
2250	10 Hz	100 kHz	0.00° - 360.00° or ±180.00°	±0.05°	0.01°	300 Vrms Max
2250	10 Hz	100 kHz	0.00° - 360.00° or ±180.00°	±0.05°	0.01°	300 Vrms Max
2000	10 mHz	700 kHz	±180.00° or 0.00 - 360.0°	±0.02°	±0.01°	0.001 Vpk to 500 Vpk
2251	30 Hz	54 kHz	0.00° - 360.00° or ±180.00°	0.01°	0.01°	20 mVrms to 300 Vrms
2000	10 mHz	700 kHz	±180.00° or 0.00 - 360.0°	±0.02°	±0.01°	0.001 Vpk to 500 Vpk