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[[Image:neoscanfig_3_10bneoscanfig_3_11.png|thumb|center|600px|<i><b>Figure 3.10</b>: Resetting the power plots and displaying them with the Entire History and Updated options.</i>]]
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[[Image:neoscanfig_3_11neoscanfig_3_11b.png|thumb|center|600px|<i><b>Figure 3.11</b>: Optimization Settings page in NeoScan Optical Bench Manager program.</i>]]
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Other parameters that should be directly set on SR844 RF Lock-in amplifier â since they are not controlled:
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ï¾ Time constant: 24 dB/oct, Figure 3.13(a).
ï¾ Remote: 50 ï external source, Figure 3.13(f).
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The signal levels at the Signal In port on the Lock-in amplifier are in the range of -100 dBm to -40 dBm or higher, depending on device one measures. It is important to set the sensitivity of the Lock-in amplifier greater than the expected input signal amplitude at the Signal Input port (from the IF Out of the optical mainframe). For example, if you expect a signal less than -67 dBm but greater than -87 dBm, set the sensitivity to -67 dBm and 100 μV (rms) setting. If the input signal is greater than the input signal setting, an OVERLOAD condition will occur and the red LED OVERLOAD indicators on the Lock-in amplifier will flash.