| Electronics > Repair |
| Heathkit Capacitor Tester IT-22 from 1965 |
| << < (3/3) |
| TimFox:
A VTVM of that era would have 11 megohm input resistance, close to a typical 10 megohm modern DMM. |
| wasedadoc:
--- Quote from: FIXITNOW2003 on May 17, 2024, 06:30:20 am ---AER you using a modern DMM to read these voltages ? the values in the manual would have be done with a much old style of test meter which would have loaded the circuit a little bit giving lower voltages , try using an old AVO 7 or similar test meter --- End quote --- Good analogue meters at that time were 20,000 Ohms/Volt. Even not so good ones were 10,000 Ohms/Volt. So drawing 50uA or 100uA respectively at full scale deflection. Those loadings in that circuit are totally insignificant. |
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