LOCAL OPERATION
3-30
More (FM deviation pk/rms, Inst dBr, dBr Ref, Abs Meas)
Press the [More] key. The right hand soft keys change, to allow selection of the FM deviation and
AM modulation measurement modes.
FM Dev Pk/rms
Toggles between measuring FM modulation with RMS or with peak detectors. The measurement
mode –
Pk or rms – appears to the left of the FM deviation bar chart.
Inst dBr
Pressing the [Inst dBr] soft key captures the current modulation level reading and enters it as the
dBr reference level.
dBr Ref
Pressing the [dBr Ref] soft key allows a modulation reference level to be set, so that the digital
modulation reading is shown as dBr levels relative to the reference. The bargraph readout and the
positive and negative readings continue to display the absolute values.
The reference level can be set using the Data input keys or captured from the current absolute
measurement by pressing the [Inst dBr] soft key.
Abs Meas
Pressing the [Abs Meas] soft key cancels the current dBr reverence level and restores the digital
modulation reading to absolute levels.
More (Mod Pk Hld)
Press the [More] key. The right hand soft keys change, to allow selection of modulation peak
hold mode, where the highest received level is displayed. An inverse video red 'P' in displayed
near to power readings that are peak-held. This also applies when the instrument performs duplex
testing.
Press [More] repeatedly to cycle through the three sub-menus, or [Return] to display the main Tx
TEST menu.
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