Operation - QSC ABX Comparator User Manual

CONNECTING TO "COMBO" CONNECTORS
The six Neutrik "Combo™" connectors accept either 3-pin male XLR or ¼-inch (6.3 mm) male
TRS connectors. Pin 2 and tip are +; pin 3 and ring are -; pin 1 and sleeve are shield.
CONNECTING TO BINDING POST TERMINALS
When setting up the ABX for amp testing, it is vitally important for safety reasons that you
connect the cabling between the amplifier outputs, the ABX, and the speakers correctly. Use
only fully insulated stranded wire.
1. First, strip back the insulation no more than ½ inch (13 mm).
2. Insert the wire fully into the opening so that no part of the conductor is exposed,
then tighten the barrel. Use a coin to tighten it, if necessary.
3. Alternately, you can use dual banana plugs.
When setting up a test between two line-level devices, these binding post connectors serve
as the return from the devices under test and the send to the amplifier. See the appendix for
more details on testing line-level devices.
IV. OPERATION
TURNING THE ABX ON
Connect the ABX to AC power: 100, 120, or 220–240 volts. The internal power supply automatically adjusts to
the AC line voltage. Turn on the unit using the front panel switch.
In the first few seconds after being turned on, the ABX's LCD display
will first display the unit model and then its firmware version informa-
tion. Then it will ask you for the type of test you wish to do.
For a power amp test, press the A button, then proceed to the calibration procedure below.
For a test of line-level devices, press the B button and see the appendix for the test procedure.
PRE-SESSION: CALIBRATION
The ABX will automatically enter calibration mode after you select a power amp test from the "Select Test Type"
screen. You can also force the ABX into calibration mode by pressing the CALIBRATE button on the front panel.
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