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Adjusting Load
Impedance
Monitoring the
Internal
Temperature
Figure 3-47, Customizing the Model 2074
As specified in Appendix A, the display of the output amplitude is
valid when the load impedance is exactly 50 Ω. Such impedance is
absolutely necessary when operating at high frequencies where
unmatched output impedance can cause reflections and standing
waves. It is therefore recommended to terminate the output with 50
Ω loads only. In certain applications where the load impedance is of
no consequence, it may range from 50 Ω to open circuit however,
since the source impedance is 50 Ω, the displayed amplitude will be
different than the actual level on the load. If you know your load
impedance, you can adjust the display to show the exact level on
your load. The adjustment, as you can see in Figure 3-47 can be
made separately for each channel. The default load impedance
setting is 50 Ω.
The 2074 has an internal temperature sensor that allows monitoring
of the internal temperature. In cases where you suspect that the
instrument is getting too warm, or malfunction occurs, you can
monitor the internal temperature to see if the cause is excessive
heat inside the unit. The temperature information is also available to
read from a remote interface, so constant control over system
temperature can be maintained.
Temperature reading is automatically read and displayed every time
you select the System display from the Utility menus. Figure 3-48 is
an example of the System menu, showing the temperature inside
the unit as 35°C. To update the reading press the numeric "0"
button.
Using the Instrument
Monitoring the Internal Temperature
3
3-73
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