QuantAsylum QA450 User’s Manual
Page 6
When 4 or 8 ohm loads are selected, attenuated (by 6 dB) versions of the speaker signals will appear at
the BNC outputs of the QA450. 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 QA450 must be connected to
the DUT ground.
QA450 Programmable Load Features
The QA450 features:
•
Programmable load values of 4, 8 or infinite (open) 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
•
First order filter to limit the slew rate
of “filterless” class D amplifiers
We hope you enjoy your purchase! Check back from time to time for new software updates.
QA450 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 QA450 is connected to the PC and talking to the QA450
application.
8 Ohm LED
This LED indicates the QA450 is presenting an 8 ohm load at the load inputs
4 Ohm LED
This LED indicates the QA450 is presenting a 4 ohm load at the load inputs
