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- The plot shows no peak/dip.
- Check the PIN diode and light, make sure there is enough light.
- If the PIN diode signal amplitude is above 100 mV already, try changing the
Lock-in Amplifier phase by 90
.
- If still no peak is detected, try changing the
start sweep frequency and the number of steps such that the program
will cover larger region.
- The plot shows multiple peaks. It might be the signal is mixed with
background (cable resonance, noise etc.). The solution might be complicated
and will not be discussed here. Contact target experts on call.
- How do I use the output data? The data is saved in a text
file consisting of two columns. The first column contains the frequency
of the EPR coil, while the second column holds the corresponding signal from the
Lock-in Amplifier. Its format can be read by programs such as SigmaPlot, Excel, and Paw.
Xiaochao Zheng
2001-06-01