139B Polarity Tester

(1) Pulse measuring method.

(2) Polarity indicator :

(a) Green indicator: Positive polarity with a beep sound.

(b) Red indicator: Negative polarity with no sound at all.

(3) Five touch switches :

(a) WF range: Suitable for measuring the polarity of the woofer.
(b) M & T range: Suitable for measuring the polarity of midrange and tweeter.
(c) EXT.1 to EXT.3: Used to select the instrument connected to the external input terminal.
(4) Model-139B can be connected with Model-7116C, to measure the buzz, and rattle of a loudspeaker. Only one operator is needed.
(5) Measuring distance: 2 to 4 Cm. from the center point. of the dust cover of the pre-measure loudspeaker.
(6) Measuring sensor: Uses ECM.
(7) Dimension ( m / m ): 85 ( height ) x 205 ( width ) x 280 ( depth ).

(8) Weight: 2.3 Kg.