3.4 Operating Instruction
PM100 / page 23
• Confirm the set value with the Enter button
• The unit will switch back to the measurement display and keep the attenuation
factor in it’s memory
3.4.6 Range Setting
The power measurement range is indicated in the second soft key from
left. Access to this soft key is given by pressing shortly the RANGE
function button or navigating to it by the left and right arrow buttons.
When the range soft key is selected another pressing the RANGE button proceeds
one auto-range step to set the unit into the optimum measurement range.
An individual range setting can then proceeded by pressing the up and down arrow
keys. The arrow keys will cycle the measurement range of the meter either in decade
steps for the digital readings or for better visibility in ‘half logarithmic’ decades ( .. 1,
3, 10 .. ) for the analog representation of the measurement values (needle display
and tune-graph display).
If the unit is in auto-range mode, pressing the up and down buttons deactivates the
auto-range mode. To get back into the auto-range mode press the Enter button.
The auto-range function can be enabled/disabled by toggling the Enter button if the
Range soft-key is activated or by entering the menu and choosing the submenus
System\Auto-range.
3.4.7 Relative Measurements
The REL∆ function is either used to subtract background light levels or
to exceed the sensitivity by ‘zeroing’ the display to enable a more sensi-
tive range setting. The offset value is then displayed as a reference in
the third soft key from left.
The REL∆ function button is used to toggle this zeroing function on and off. When the
soft key is activated also the Enter and the up/down buttons toggle the relative
measurement on and off.
When the REL∆ function is activated, the bar-graph and analog needle display go to
a middle-positioned scale with an automatic zoom by a factor of 10.
RANGE
REL∆
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