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DFP-3000
9.9 Test Cable for Performing A-Chain Adjustment
The DFP-D3000 provides a convenient, front-panel phone jack with a selector switch. This jack can be
used to connect a spectrum analyzer (RTA) and X-Y oscilloscope to facilitate A-Chain calibrations and
adjustments. The following diagram shows the connections of the cables for connecting the spectrum
analyzer and X-Y oscilloscope to the DFP-3000 headphone.
Required parts
1/4-inch (6.3 mm) stereo headphone (TRS or Tip, Ring, Sleeve) plug
Shielded cable
Actual Wiring Diagram
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1. In the above Actual Wiring Diagram, the headphone plug cover is shown removed.
2. Use quality shielded cables for connecting the external equipment and the headphone plug. Always
connect all shielded cables (shaded part) to the Sleeve Common terminal of the headphone plug.
3. The input terminal of the external equipment side differs in shape at each equipment. To construct a
cable, be sure to refer to the manual of each equipment. Also be sure to connect the shielded cables to
the common (GND) terminal of the input signal.
4. When checking and adjusting the A-chain using this cable, set the DFP-D3000 headphone monitor
select switch to No. 5 (Lt + Rt) before starting work. This information will also be displayed on the
LCD during the setting.