52840 BQB certification problem

[helen]

Hi Nordic,

One of my customer is doing the BQB certification with nRF52840.

When test the coded phy, the error occurs: failed to obtain enough packets 3.

The following two testing item didn't pass:

RFPHY/TRM/BV-14-C [Carrier frequency offset and drift, LE Coded (S=8)] RFPHY/TRM/BV-13-C [Modulation Characteristics, LE Coded (S=8)].

Here is the setting of Direct Test Mode tool:coded S8, constant carrier.

How can we set the Direct Test Mode tool to pass the test?

[ketiljo]

Hi

Can you ask what version of the DTM they are using? Coded phy should be supported and working with the latest DTM version from SDK 17. The device must be controlled by the BLE tester over UART, so the DTM test tool shouldn't be used for this. 

There's no need to repeat the RF-PHY testing as they can refer to the QDID for the RF-PHY that's already tested by us. https://launchstudio.bluetooth.com/ListingDetails/115770

[helen]

Hi Ketil，

ketiljo said:

The device must be controlled by the BLE tester over UART

What do you mean by ‘BLE tester’, is it a PC software used to test the performance of radio?

If so, would you please kindly share the link of the download website, and I think there must be the guideline of how to use it.

[ketiljo]

When DTM is used, a tester, like the R&S CMW200 or 500, Aritsu MT8252B or similar, will control the radio via the UART. The RF port is used to transmit signals for RX testing or receive for TX testing. You can't control the UART without the tester. If you do, the tester won't be able to control the device.

Take a look at this: https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html

[helen]

hi Ketiljo

Many thanks！