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| Old Fluke Multimeters |
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| frozenfrogz:
Here is an imgur Album of my 8024A :) Also, some quick snapshots of the 8020B, 8024A and 8060A agreeing on some mV, V and mA values. Here are various forward voltage readings of my meters in diode test mode, figures in brackets are taken with my 8060A in series to measure testing current - except 8060A in series with 8050A: Diode: 1N4007 8020B: 0.680 V (0.805 V, 0.8069 mA) 8024A: 0.853 V (0.975 V, 0.6367 mA) 8060A: 0.5797 V (0.6781 V, 0.9748 mA) 8050A: 0.6421 V (0.7583 V, 0.8702 mA) 79SeriesII: 0.552 V (0.607 V, 0.6041 mA) UT139C: 0.587 V (0.683, 1.0061 mA) HC601: 0.794 V (0.915 V, 0.6854 mA) VC6010: 0.746 V (0.867 V, 0.7355 mA) Can you calibrate this separately in the meters or is it just depending on the overall V / A calibration? Pictures: ca. 190 mV, 18.8 V, 18 mA, 88.8 mA from Oltronix B703DT |
| EE-digger:
Thank you so much ! I didn't even realize produced manuals like that. This will keep it going another 30 years or more :-+ |
| Neomys Sapiens:
--- Quote from: frozenfrogz on March 15, 2018, 05:08:29 pm ---Here are various forward voltage readings of my meters in diode test mode, figures in brackets are taken with my 8060A in series to measure testing current - except 8060A in series with 8050A: Diode: 1N4007 8020B: 0.680 V (0.805 V, 0.8069 mA) 8024A: 0.853 V (0.975 V, 0.6367 mA) 8060A: 0.5797 V (0.6781 V, 0.9748 mA) 8050A: 0.6421 V (0.7583 V, 0.8702 mA) 79SeriesII: 0.552 V (0.607 V, 0.6041 mA) UT139C: 0.587 V (0.683, 1.0061 mA) HC601: 0.794 V (0.915 V, 0.6854 mA) VC6010: 0.746 V (0.867 V, 0.7355 mA) Can you calibrate this separately in the meters or is it just depending on the overall V / A calibration? --- End quote --- :wtf: Fuh, that is some serious spread. I think It would be a good approach to take a comparison measurement with a resistor too, and then to separate the errors of the current source and the reading. But I do not like at all what you found. Will do some measurements too when time allows. |
| helius:
They seem to be roughly proportional to the test current, which is no big surprise. For actually characterizing semiconductor junctions (and not just verifying if they are short/good/open) you need a curve tracer. |
| frozenfrogz:
Measurements on VEB decade resistance boxes 0.1\$\Omega\$, 100\$\Omega\$, 10 k\$\Omega\$ and 100 k\$\Omega\$, test leads shorted measure: 0.05\$\Omega\$ DMM Model1 x 0.1\$\Omega\$ 1 x 100\$\Omega\$ 1 x 10 k\$\Omega\$ 10 x 10 k\$\Omega\$ UT139C000.1/.0099.910.00k100.0k8060A0.10/.0999.9710.004k1000.06k8050A00.1099.9810.007k100.08k8024A00.1/.299.8/.910.00k100.1k8020B00.1/.2100.010.00k100.1k79II00.10100.010.01k100.1kHC60100.199.810.00k99.9kVC601000.1/.299.7/.810.01k100.1k DMMs in the most suitable measuring range available, 79II with calibrated 40\$\Omega\$range for 0.1\$\Omega\$measurement. 8050A and 8060A in relative mode to shorted leads Edit: /.value indicates the meter alternating on two values. OT: Formatting around that fugly »ohms« symbol is a pain in the b :/ |
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