The Escort ELC-120 LCR digital meter is used on all these Pleiades experiments. (Electrolytic capacitors should really be replaced as they are old).
When the scale is switched to 20H it sends a much lower frequency signal to its terminals.
Today the 2 frequencies it uses were measured by beat comparison with the online tone generator. The Sennheiser HD580 headphones were connected to the Escort meter (careful with acoustic levels for protecting ears). The tone generator was playing on the iPad's speakers.
This is the tone generator used:
http://onlinetonegenerator.com
The 2 frequencies are 1028Hz and 97Hz, + or - 1Hz.
Some inductors have a much higher value of inductance at a lower frequency. It depends on the material of the core. Mumetal for example.
The Jensen JT-115K-E was measured:
Both measurements at 97Hz.
Primary inductance: 7H
Secondary inductance: 665H
There is some uncertainty on the 665H measurements as the instrument may already be out of its range.
No comments:
Post a Comment