Please ensure that the instrument's firmware is at the latest revision.
On the PC side, sometimes when installing the 2 drivers that are required for the USB connectivity, they do not get installed properly and reinstalling will not work.
In this case, go to: Control Panel > System > Device Manager (this is under hardware on XP operating systems).
This should correct the original corrupted driver install.
For more information review the documentation below or visit Master Software Tools.
Firmware Update for BTS Master MT8222A models with firmware version at or above v1.58
Updating Anritsu Handheld Instrument Firmware
Firmware Update for BTS Master MT8222A models with firmware versions below v1.58
Updating Legacy Anritsu Handheld Instrument Firmware
Motorola WinLMF with BTS Master MT8222A Quick Start Guide
LTE eNodeB Troubleshooting Guide
Spectrum Analyzers Field User Guide
E1 Backhaul Testing Field User Guide
TD-SCDMA/HSDPA Base Station Troubleshooting Guide
T1/DS1 Backhaul Testing Field User Guide
GSM/GPRS/EDGE Base Station Troubleshooting Guide
Fixed WiMAX Base Station Troubleshooting Guide
Interference Troubleshooting Guide
CDMA2000 1X Base Station Troubleshooting Guide
CDMA2000 1x EV-DO Base Station Troubleshooting Guide
Mobile WiMAX Base Station Troubleshooting Guide
BTS Master MT8222A User Guide
BTS Master MT8222A Online Help System
Spectrum Analyzer Measurement Guide
Power Meter Measurement Guide
BTS Master MT8222A Maintenance Manual