50 to 10000 hz frequency range; 0.35 freq in hz or 350 volt max rms input voltage; rotary normal duty switch type; continuous resolution; 4 ohm plus 200 uh direct and 12 ohm plus 1.5 mh max effective series impedance; 150 kohm min direct and 150 kohm min isolated input impedance at 20 v, 400 hz; 19.000 in. W; 5.250 in. H; 6.500 in. D; rack model