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Toa ZM-104, Supplementary Manual

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Fig.  6  -  Identifying  loud-

speaker wiring.

Fig.  7  -  A  pas-

sive  “butt”  set 

increases  the  use-

fulness of the ZM-

104 (www.jwdavis.

com). An inductive 

tester  is  equally 

useful.

Fig. 8 - Identifying transformer parameters.

Fig. 9 - Performing the “Pin 1 Test” on an input.

Fig. 10 - Performing the “Pin 1 Test” on an output.

From Syn-Aud-Con Newsletter Vol. 32 No.3

4

Summary of Contents for ZM-104

Page 1: ...n Measuring Impedance Severalmethodscanbeusedtodeterminetheimped ance of a load The most straightforward way is to use Ohm s Law to determine impedance from the volt age across the load and the current through it Figure 1 shows how to make the measurement with a volt ohmmeter VOM Impedance can also be measured using a constant current source This is the method that the ZM 104 uses The meter has a ...

Page 2: ...ions should produce an output signal from the DUT Fig 3 Common mode Rejection This one is just like the differential input test except that instead of driving the and terminals alternately lay the test probe across both Fig 4 The signal will be cancelled by the common mode rejection ratio CMRR of the input if it is differential Balanced Output Tester A balanced output will have the same output imp...

Page 3: ...on produces an audible tone from the unit then the shield of the connecting cable should be lifted or routed directly to the chassis with a jumper The ZM 104 sources about 20ma on the x1 setting This is enough current to iden tify the problem but not enough to damage any internal components etc See AES Journal Reprint June 1995 Grounds and Shields for more information Impedance Oh yes the ZM 104 c...

Page 4: ...increases the use fulness of the ZM 104 www jwdavis com An inductive tester is equally useful Fig 8 Identifying transformer parameters Fig 9 Performing the Pin 1 Test on an input Fig 10 Performing the Pin 1 Test on an output From Syn Aud Con Newsletter Vol 32 No 3 4 ...

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