ADC Test

Purpose

This test verifies the capture of simulated raw voltage data by generating ADC data patterns. The software requests the LMC data type “raw data”, and captures this using the DAQ receiver.

NOTE: This test operates on all TPMs in a station individually. For data acquisition to function correctly, the network interfaces on the TPM must be working, as well as the link to the LMC destination. The LMC destination must be configured to route traffic to the server running the tests. For all tests the simplest option is for the CSP and LMC destinations to be the same network interface, routing all traffic to the server running the tests.

Methodology

  1. DAQ receiver is configured and initialised with the required UDP port and network interface.

  2. A ramp pattern is configured and enabled on the TPM at the output of the ADCs

  3. An LMC snapshot of raw voltage data is requested from the TPM

  4. The captured data is received over 40GbE and compared to the expected pattern

  5. This is repeated for a fixed data pattern.

Typical issues

Some typical issues and how they present are shown below:

Presentation: No data is received. Test halts indefinitely waiting for SPEAD packets.

Issue: Network configuration issue. Check the MTU is set to 9000 on every switch, port, VLAN or NIC in the chain.