QuantAsylum QA451 User’s Manual
Page 6
When open, 4 or 8 ohm loads are selected, attenuated (by 12 dB) versions of the speaker signals will
appear at the BNC outputs of the QA451. For example, the L- speaker input will appear at the L- BNC
output, attenuated by 6 dB.
If you are using a single-ended amplifier, then the negative load inputs the QA451 should be connected
to the DUT ground.
QA451 Programmable Load Features
The QA451 features:
•
Programmable load values of 4, 8 or open (~10K) ohms.
•
Current sensing of amplifier DC supply.
•
On/off control of the DC supply via high-side PMOS switch
•
Power handling up to 300W (duration limited)
•
Current limiting of supply for accidental shorts (trips when >15A for more than 2mS)
•
Soft-start, allowing gentle turn-on of the amplifier DUT
•
6
th
-order filter between the load and the measurement output, with a corner frequency at 65
kHz.
We hope you enjoy your purchase! Check back from time to time for new software updates.
QA451 Front Panel
This section covers the various connectors on the analyzer and reviews the input and/or output
characteristics of these connectors.
Front Panel Summary
The front panel is shown in the picture below. From left to right, the following items are explained.
LEDs
Link LED
This LED indicates the QA451 is connected to the PC and talking to the QA451
application.
