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2
Select the unit of the display scale: dBm, dBV, dBmV, dBµV, V, or W.
The scale unit on the screen changes accordingly.
NOTE
For the Field Strength mode, the units change to dBµV/m, dBmV/m, dBV/m, Volt/m,
Watt/m^2, and dBm/m^2.
Pre-amplifier
You can turn the internal pre-amplifier on to correct and compensate for the gain of the preamplifier so
that amplitude readings show the value at the input connector.
Procedure
1
Press the AMP/SCALE hard key.
2
Toggle the Preamp soft key and select On or Off as needed.
NOTE
You can turn the Preamp on when the input attenuation range is from 0 dB to 10 dB. If
the attenuation value is manually set to greater than 10 dB, the instrument will
automatically turn off the pre-amplifier to display low-level signal properly on the chart.
External offset
You can turn the External Offset on and manually set the external offset value. An offset consists of a
cable loss and a user offset and the measurement result shows the value reflecting both offset values.
When the external offset value is set at 40 dB in the Spectrum mode, the measurement result
compensates 40 dB at both the Spectrum Analyzer and Signal Analyzer modes
Procedure
To set the external offset:
1
Press the AMP/SCALE hard key.
2
Toggle the External Offset soft key and select On.
3
Enter a value by using the numeric keys.
4
Press the dB soft key to complete the entry.
To turn the external offset off:
1
Press the AMP/SCALE hard key.
2
Toggle the External Offset soft key and select Off.
NOTE
This setting is not used in the Field Strength mode.
Scale per division
You can use the Scale/Div feature available for the spectrum measurement screen. It represents the
value of one division on the horizontal scale. The default setting is 10 dB per division and the
maximum value can be set up to 20 dB.
JD700B Series User's Guide
Chapter 4 Using Spectrum Analyzer
57
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