Test Panel Connectors
2-14 PN: 10580-00277 Rev. E Spectrum Master UG
USB Interface – Type A
The MS272xC Spectrum Master can also be a USB Host and allow various USB Flash
Memory devices to be connected to the instrument for storing measurements, setups, and
files.
USB Interface – Type Mini-B
The USB 2.0 interface can be used to connect the MS272xC Spectrum Master directly to a PC.
The first time the MS272xC is connected to a PC, the normal USB device detection by the
computer operating system will take place. The CD-ROM that shipped with the instrument
contains a driver for Windows XP that is installed when Master Software Tools is installed.
Drivers are not available for earlier versions of the Windows operating system. During the
driver installation process, place the CD-ROM in the computer drive and specify that the
installation wizard should search the CD-ROM for the driver.
Headset Jack
The headset jack provides audio output from the built-in AM/FM/SSB demodulator for testing
and troubleshooting wireless communication systems. The jack accepts a 2.5 mm 3-wire
miniature phone plug such as those commonly used with cellular telephones.
Ref Out
The External Reference Out port is a BNC female connector that provides 10 MHz at
approximately –7 dBm to 0 dBm.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC
connector. Do not overtighten the connector.
Ext Ref In
The External Reference In port is a BNC female connector that provides for input of an
external frequency reference.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC
connector. Do not overtighten the connector.
IF Out 140 MHz (Option 89)
BNC connector for Zero Span 140 MHz IF Output with Option 89.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC
connector. Do not overtighten the connector.
Ext Trigger In
A TTL signal that is applied to the
External Trigger female BNC input connector causes a single
sweep to occur. In the Spectrum Analyzer mode, it is used in zero span, and triggering occurs
on the rising edge of the signal. After the sweep is complete, the resultant trace is displayed
until the next trigger signal arrives.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC
connector. Do not overtighten the connector.
Note
For proper detection, Master Software Tools should be installed on the PC prior to
connecting the Spectrum Master to the USB port.
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