I just recently procured a used 1130A InfiniiMax differential probe for use with my MSO7104A scope. Unfortunately, I have run in to a rather major issue - the scope is not recognizing the probe. About three seconds after I plug it in, the scope pops up an error message that says there is an unsupported probe connected. The scope also does not switch the input to 50 ohms, like it does with the 1156A and 1158A probe I have. According to the Agilent documentation for infiniivision series probing, the 1130A is listed as 'recommended' for the 7000 series. Does anyone know what might be going on here?
In this case, however, the box pops up after several seconds, not immediately. And the scope seems to hang between when the probe is conneted before the message pops up. Also, the probe itself also seems to be functional. I disassembled the probe and experimented with inserting subsets of the pogo pins and trying it on the scope. It seems that when the center three pogo pins are removed and the probe is connected to the scope, the scope doesn't recognize it at all (it acts like there is no probe connected), but the trace on the scope display reflects the output of the differential amplifier in the probe, indicating that the analog portion of the probe works (e.g. it isn't shorted like the 1158A was when I got it).
Is there anyone who knows more about the autoprobe interface that might be able to shed some light on to what might be going on here? I found a forum post on the EEV blog that indicates the probes use a serial EEPROM for identification, and the board inside the 1130A has an ST 24C02 I2C EEPROM on it. Is there any possibility that is contents might have gotten corrupted and simply reprogramming the EEPROM might render the probe fully functional again?