How To Choose The Range Mode; How To Set The Range - Keysight N7744A User Manual

How to Choose the Range Mode

How to Set the Range

Keysight N774x Series
You can choose either of two ranging modes:
•
<Auto>, the auto-ranging mode, ensures that the result has a
returned value between 9% and 100% of full scale. The default state
is for automatic ranging to be enabled.
•
<Manual>, which allows you to set a user-defined range.
The range setting determines the power levels that can be measured.
The setting should be high enough for the applied power, but lower
settings will provide a lower noise level for weak signals.
If you choose auto-ranging mode, this parameter can not be set. The
Range parameter returns the automatically-determined range.
If the measured power is more than 3dB greater than the range setting,
the power cannot be measured and an overflow is indicated by the
returned power value. This means that the measured power is greater
than the Upper Power Limit. You must increase the [Range] value.
More more details, see the following table.
Upper Power Limit
The following table shows the upper power limit at the available power
ranges. The lowest measurable power in each range is determined by
the noise level, which depends on the range setting and the averaging
time.
Table 3 Upper Power Limits for Various Power Ranges
[RANGE]
10 dBm
0 dBm
-10 dBm
-20 dBm
-30 dBm
Upper Power Limit
10.000 mW
1.9999 mW
199.99 µW
19.999 µW
1.9999 µW
2
Power Measurement
10.000 dBm
3.000 dBm
-7.000 dBm
-17.000 dBm
-27.000 dBm
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