Boonton PIM 31 User Manual - Manual (Page 53)

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7.3.2.5 BAR Graph G/R
Advanced Mode Only
The Bar Graph’s green/red threshold is -153dBc
by default. The switch from green to red is an
optical indicator if a DUT is within limits or if it
exceeds them. PIM measurement values higher
than the set threshold can
provide an audible indicator.
Obviously Audio has to be
switched on in the Field Mode
screen. Maxhold is an important
feature which holds the
maximum value during PIM
measurements. In this example
the maxhold value is -147 dBc.
Bar Graph g/r: -60dBc to -
180dBc in 1dB increments
Default: -153 dBc
7.3.2.6 Precision Tx Levels
Advanced Mode Only
ALC (Auto Level Control) provides an extra
boost of Tx Signal accuracy. When measuring
PIM, two RF carrier signals are combined and
transmitted into a passive RF component (DUT). Depending on its quality, the
DUT generates more or less intermodulation energy. For best measurement
accuracy the injected signals should closely match their power levels. With ALC:
ON, the PIM31 will synchronize these power levels perfectly. Increased accuracy
costs a bit more time. Setting Tx power levels with will 0.05 to 0.2 sec longer than
with ALC: OFF. With the exception of high volume production, this additional time
is not an issue, so it is recommended to always leave ALC ON.