N. BlaskovicFONT Meeting1 FONT5 board #2 DAC tests N. Blaskovic.

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Presentation transcript:

N. BlaskovicFONT Meeting1 FONT5 board #2 DAC tests N. Blaskovic

Introduction Young-Im and I saw a flickering DAC1 output from FONT5 board #1 on Monday. Following Doug, Glenn and Colin’s suggestion, the DAC outputs of the available FONT5 board (#2) were tested. Scope screens presented here were saved on infinite persistence to record any such flickering. FONT Meeting2N. Blaskovic

Local Control Room (LCR) S-band hut C-band hut Set-up FONT Meeting3N. Blaskovic FONT5 board 2 Dig in 1 Dig in 2 Fast clock DAC 1 DAC 2 Mikey’s clock distribution box Trigger Ring clock Fan out 50Ω termination

Note on fan outs It was found that the pairs of fan out outputs must be terminated if not in use. A scope was used for termination due to inability to find 50 Ω terminators. If unterminated, spurious edges observed, e.g. ‘double’ trigger. FONT Meeting4N. Blaskovic ‘double’ triggerring clock

ZPUL3 power supply FONT Meeting5N. Blaskovic DAC 4000, in binary:

ZPUL3 power supply FONT Meeting6N. Blaskovic DAC -4096, in binary:

ZPUL3 power supply FONT Meeting7N. Blaskovic DAC 2048, in binary:

ZPUL3 power supply FONT Meeting8N. Blaskovic DAC 1024, in binary:

ZPUL3 power supply FONT Meeting9N. Blaskovic DAC 512, in binary:

ZPUL3 power supply FONT Meeting10N. Blaskovic DAC 256, in binary:

ZPUL3 power supply FONT Meeting11N. Blaskovic DAC 128, in binary:

Comment The series of power-of-2 DAC settings show no anomalous behaviour. A drawback is that the scope is triggered on the DAC waveform itself; a null output will not trigger! Triggering on the kicker trigger would have been appropriate. Final test: exonerate a DAC out of FONT Meeting12N. Blaskovic

ZPUL3 power supply FONT Meeting13N. Blaskovic DAC 1000, in binary:

ZPUL3 power supply FONT Meeting14N. Blaskovic DAC 1001, in binary:

ZPUL3 power supply FONT Meeting15N. Blaskovic DAC 1002, in binary:

ZPUL3 power supply FONT Meeting16N. Blaskovic DAC 1003, in binary:

ZPUL3 power supply FONT Meeting17N. Blaskovic DAC 1004, in binary:

ZPUL3 power supply FONT Meeting18N. Blaskovic DAC 1005, in binary:

ZPUL3 power supply FONT Meeting19N. Blaskovic DAC 1006, in binary:

ZPUL3 power supply FONT Meeting20N. Blaskovic DAC 1007, in binary:

ZPUL3 power supply FONT Meeting21N. Blaskovic DAC 1008, in binary:

ZPUL3 power supply FONT Meeting22N. Blaskovic DAC 1009, in binary:

ZPUL3 power supply FONT Meeting23N. Blaskovic DAC 1010, in binary:

ZPUL3 power supply FONT Meeting24N. Blaskovic DAC 1011, in binary:

ZPUL3 power supply FONT Meeting25N. Blaskovic DAC 1012, in binary:

ZPUL3 power supply FONT Meeting26N. Blaskovic DAC 1013, in binary:

Observations The DAC1 flickering output was obtained again, using the other FONT5 board than on Monday. The DAC2 output does not flicker. The existence and extent of flickering may depend on the number of ‘1’ digits in the binary form of the DAC value set. FONT Meeting27N. Blaskovic