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PIM Master

™

Passive Intermodulation Analyzer

PIM Master™ Overview

Distance-to-PIM™ (DTP)

Distance-to-PIM (DTP) is similar to Distance-to-Fault (DTF), which Anritsu

introduced in the Site Master™ in 1997 for identifying the location of

impedance mismatches in a feed line. DTP quickly and accurately identifies the

location of PIM faults inside the feed system as well as beyond the antenna.

This capability eliminates the guesswork involved in isolating PIM sources and

speeds site repairs.

Up to 6 markers can be activated in Distance-to-PIM to identify the magnitude

and distance to PIM faults found in the system. Using Anritsu’s familiar

Line Sweep Tools (LST) application, operators can overlay multiple DTP

measurements to identify what has changed since the last visit. This enables

the ability to see growing PIM problems and take corrective action before they

impact network performance.

PIM vs. Time

The PIM Master includes a PIM versus Time measurement that tracks not

only the instantaneous PIM level but also records the maximum PIM level

experienced throughout a fixed frequency PIM test. The two test frequencies,

transmit power level, intermodulation order (3

, 5

or 7

) and test duration

can be easily adjusted by the user to meet the test requirements.

This mode is useful for dynamic PIM tests as it not only captures the peak

PIM value for pass / fail determination but also provides a visual indication

of the stability of the system under test. When a limit line is entered in this

mode, the color of the PIM magnitude changes to red when the value has

exceeded the limit value. The peak value will remain red indicating a failure

even if the PIM level returns to a passing level after the dynamic stress has

been removed.

Swept PIM

When making a Swept PIM measurement, the PIM Master is able to evaluate

changes in PIM magnitude versus Intermodulation (IM) frequency. This test

is conducted by holding one transmit tone fixed while varying the frequency

of the second transmit tone, causing the IM product to “sweep” across a

range of frequencies in the receive band of the system. The magnitude of the

PIM generated versus frequency is displayed and can be compared to a user-

selected pass / fail limit.

PIM measurements are the vector sum of all PIM signals generated on a

line at the IM frequency being tested. When multiple PIM sources exist, it is

possible for the signals to combine out of phase at a particular test frequency

indicating a passing result when the individual PIM levels are actually failures.

A swept PIM test varies the IM frequency over a range of frequencies

providing the user a clearer picture of the true PIM performance of the

system. It is worth mentioning that Distance-to-PIM measurements provide

the same function as they also evaluate a range of frequencies rather than a

single IM frequency.

Remote Control

The PIM Master can be configured for remote control via WiFi to support

a variety of testing scenarios. Line of site distances of >100m (>328FT)

have been achieved allowing a person on the ground to control of the test

equipment while a person at the top of the mast makes connections and

performs dynamic testing. This capability is also useful for rooftop testing,

allowing one person to control the test remotely while following the cable run

and performing dynamic tests.

Noise Floor Measurement

A special test mode is available that activates the PIM Master receiver to

monitor the IM product frequency vs. time. During this measurement, the

PIM Master transmitters are disabled. This feature allows the user to quickly

check to make sure the spectrum is clear before performing a PIM test.

Easy to view display

The PIM Master uses the same large, field proven, color touch screen displays

found in other Anritsu Handheld products. Five different screen settings

are available to enhance visibility in the environment where the test will be

performed. This includes a Black & White setting to improve readability in

direct sunlight as well as a Night Vision setting to reduce screen brightness

for nighttime operation.

Distance-to-PIM (DTP)

PIM Level (dBm) vs. Distance (meter)

Diplexer in shelter Antenna

PIM vs. Time

PIM Level (dBm) vs. Time (second)

Dynamic testing

Swept PIM

PIM Level (dBm) vs. Frequency (MHz)

1 2 3 4 5 6 7 8

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