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| All about Keithley DMM7510. Bugs and features, recipes, advice, notes. |
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| HighVoltage:
I have installed Firmware Revision 1.7.12 and both of my DMM7510 run perfect so far. |
| MegaVolt:
User manual in russian. |
| MegaVolt:
A new specification has been released with a bunch of surprises. 1. Current accuracy has become worse. 2. As a consequence, this affected resistance. 3. Noise levels are increased 4. Other minor changes. I have collected all the significant differences in pictures. |
| MegaVolt:
Continuation |
| Kleinstein:
Accuracy specs and especially the long term drift part is difficult to estimate up front. So not such a surprise to see an update on those specs. Also the performance of the shunts may scatter more than expected. A part may also be due to a change in parts used (e.g. old source no longer available) and may thus only apply to new units. For the noise specs it is a bit surprising to see corrected higher noise specs. It could be that the noise performance is scattering more than expected. Otherwise the noise should be relatively consistant and easy to test. So the noise performance could be tested individually, at least for some ranges. Maybe they got too many units that did not pass the test or get returned as defective because of too much noise. I would have more expected a correction downwards, e.g. from improved parts or a slight circuit change to reduce the noise. I don't know the details of the ADC (only info from pictures and analogy to other meters), but there is a good chances there is weak point that could be improved on. With so many changes this may even be just a more cauteous new staff, adding more margin or using less optimistic estimates. |
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