FastBus Errors

10/16/2003

Missing channels in ADCs

Message: ADC[7] size 61!=65

This ADC 1881M SN 854643.

Word counter from the ADC shows that some channels are missing.

 

Case 1. Dead channels:

0120:3478026a 347a0246 347c0276 307e025b 38000a3d 380001bb 38020201 380401f7

0140:380601ed 3c08022b 380a0236 3c0c0245 380e023d 381001e9 3c1201f7 3c140204

0160:381601ef 38180244 3c1a0242 381c01f4 381e0244 3c2001d7 382201c9 3c2401cb

0180:3c2601c0 3c28021a 382a0279 382c025b 382e0269 383001e7 3c3201b1 38340170

01a0:3836017e 38380268 383a0265 3c3c0280 3c3e0242 38400000 3c420000 3c440000

01c0:38460000 3c480275 384a021f 384c0245 384e026a 38500218 3c5201f5 385401cb

01e0:385601cf 3c580277 385a023f 3c5c0238 385e0238 38600038 3c620073 38640056

0200:3c66005a 387000ee 387200f4 38740105 3c7600d5 3878026c 3c7a0299 3c7c0281

0220:387e0265 90000a41 900001a4 940201b5 90040193 9406018b 90080214 900a0210

Here missed ones are: 3C68XXXX 3C6AXXX 3C6CXXXX 3C6EXXXX. The blue counter in the header is consistent: 3d, but should be 41.

 

Case 2. Inverted cable.

In that case 16 channels will be missed.

Zero channels

In the previous example codes 38400000 3c420000 3c440000 38460000 shows zero values.