PURPOSE The purpose of this plug-in is to expand the usefulness of Dranetz Series 305 phasemeters by adding the ability to measure the voltage of both inputs in either volts or dB reference 1 Volt = 0 db. The ratio in dB of the "Signal” input with respect to the "Reference" is also measured, 1.3 CHARACTERISTICS The detailed characteristics of the 305~PA~3009 when used in a series 305 phasemeter are specified by Table 1.1 which follows: TABLE 1.1, 305-PA-3009 SPECIFICATIONS INPUT LEVEL RANGE: 10 mV rms to 40 V rms both inputs. INPUT IMPEDANCE: 1 Megohm plus 40 pf both inputs, usable with standard oscilloscope probes. INPUT FREQUENCY RANGE: 2 Hz to 700 kHZ FUNCTIONS: Amplitude of reference input in volts or dR ref 1 volt, Amplitude of signal input in volts or dB ref 1 volt. Phase angle of signal input with respect to reference input, and Ratio of signal input to reference input in dB, The function to be displayed is selected by a switch on the front panel of the plug-in. ANALOG OUTPUTS: Four Outputs are simultaneously available at the rear of the. phasemeter main frame* They are proportional to Reference input level (in either volts or d b) , Signal input level (in either volts or d b ) , Phase Angle of Signal with respect to reference* and ratio of signal to Reference In db. The sensitivity of all db outputs is 10 mv/db, The sensitivity of the phase angle Output is 10 mv / degrees (a positive, output indicates that Signal leads Reference). The voltage amplitude output« have one of 3 sensitivities depending on which voltage range is in use* Sensitivity Is 10 volts/ volt in the mv x 1 range, 1 volt/volt in the mv x 10 range and 0*1 volt/volt in the volts *10 range.