Dayton WT3 User's Guide download pdf (Page 7)

Quick Start for WT3

(v2.0)

on Windows XP

*** VERY IMPORTANT SAFETY NOTE ***

NEVER connect the test leads of the WT3 to a speaker that is connected to any other

equipment or to an equipment ground! Severe damage could occur to the WT3 unit or to

the other equipment! Only connect the WT3 to an unconnected loudspeaker.

Here are step-by-step instructions to get you going quickly. Later, as you wish to learn more about using WT3, you can refer to the

built-in User’s Guide found under the Help menu.

1) Install the WT3 software.

Insert the WT3 CD into your PC’s drive and allow the file named "WT3_setup.exe" to auto-play.

(Alternately you can double-click on the file "WT3_setup.exe" to start the installation process.)

Follow the on-screen instructions to complete the software installation. Do not launch the software.

Check for available upgrades at: http://www.daytonaudio.com/wt3updates.html

2) Connect the WT3 hardware unit to any convenient USB port on your computer.

Upon being connected and powering up the unit requires a full 90 seconds to stabilize before

measurements can be made. After this plug-in delay, impedance measurements take only a few seconds

to complete. The 90 sec. settling time is related to the requirement for precision measurements down to 1

Hz.

3) Launch the WT3 application software.

From the Windows “Start” button select “All Programs” then select “WT3”.

4) Calibrate the test leads.

From the WT3 “Impedance Analyzer” menu select “Test Leads Calibration…”. Short the test leads by

clipping them together and click OK to calibrate the software for the test lead resistance. The test lead

resistance should be less than 1 Ohm as seen at the bottom right of the WT3 screen. If not, wait a few

seconds and try again…the hardware needs a full 90 seconds to stabilize after power up. If the test leads

should fail to calibrate then select “Impedance Calibration…” under the Impedance Analyzer menu, click

on “Restore Default Calibration” and repeat the test leads calibration procedure.

5) Calibrate at 1k Ohms.

Select “Impedance Calibration” under the “Impedance Analyzer” menu and follow the instructions to

calibrate the system at 1k Ohms using the supplied precision 1% resistor. The software will test the resistor

and plot the results. The calibrated impedance is displayed and the calibration is complete. Verify that the

value displayed in the R(e) field at the lower right side of the WT3 screen is reasonably close to 1000

Ohms. If not, repeat the calibration procedure making sure the hardware has had a full 90 seconds to

stabilize. A measured value between 950 and 1050 Ohms is expected.

6) Connect the WT3 alligator clips to the terminals of the speaker to be tested.

The speaker MUST NOT BE CONNECTED to anything else such as an amplifier, other electrical

equipment or ground. For best results clamp the driver in place and allow adequate clearance for any rear

pole piece vents.

7) Click on the "Measure Free Air Parameters" button at the left of the WT3 window.

You should hear the sweep and then see the impedance response of the driver appear on the screen. The

speaker’s free air parameters are displayed in the Parameters Bar at the right side of the screen. At the left

side you can set the upper impedance limit and the high and low frequency limits.

Revised: 4Feb11

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Dayton WT3 User's Guide Page 7

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