Lesson 3/Learning Event 6
e. Sensitivity.
Sensitivity of the instrument extends from absolute
values of -95 to +23 dBm.
Two attenuators are provided for varying the
input signal level in 1 and 10 dB steps, respectively. Both attenuators are
calibrated in two scales: dBm and dBrn. An input noise level that requires
an attenuator setting of +80 dBrn under C-message weighting in order to show
0 dBm on the meter is equivalent to an input level of +80 dBrnc0 to the
attenuator. Further, there is a 10 dB difference between meter scales for
dBm and dBrn. In actual input level values, 0 dBm is therefore equal to +90
dBrnc0 with C-message weighting, and 0 dBrnc0 is equal to -90 dbm.
f. The function of the indicators, controls and connectors/jacks for
the TTS-37B are listed and explained in table 1 of the appendix.
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