The test panel connectors are shown in Figure 1‑10, Figure 1‑12, and Figure 1‑11 and are described in the text that follows.
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50 Ω Type‑N female connector. This connector is unique to the MS2721B and is present when Option 20 is installed. The Tracking Generator option is not available on models MS2723B, MS2724B, and MS8911B. For Tracking Generator operation, refer to the Signal Generator Measurement Guide (listed in Measurement Guides).
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type‑N connector. Do not overtighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
Digital Signal Output (DVB ASI Out) Connector
The digital signal output, BNC female connector is unique to the MS8911B and MS2721B and is present only when both DVB‑T/H (Option MS2721B‑0064 or Option MS8911B‑0050) and DVB‑T/H BER (Option 57) are installed. The Digital Television Signal Analyzer options are not available on models MS2723B and MS2724B. For Digital Television Signal Analyzer options operation, refer to the Digital Television Signal Analyzer Measurement Guide, Anritsu (listed in Measurement Guides).
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
The DVB‑ASI function produces MPEG‑TS data output during a BER measurement. This output can be connected to MPEG‑TS analysis equipment to monitor video errors or can be connected via an appropriate ASI to USB demultiplexing and decoding accessories for channel identification and monitoring purposes.
IF Out 37.8 MHz
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
The external power connector is used to power the unit and for battery charging. Input is 12 VDC to 15 VDC at up to 5.0 A. A green flashing indicator light near the power switch shows that the instrument battery is being charged by the external charging unit. The indicator is steadily illuminated when the battery is fully charged.
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When using the AC‑DC Adapter, always use a three‑wire power cable that is connected to a three‑wire power line outlet. If power is supplied without grounding the equipment in this manner, then the user is at risk of receiving a severe or fatal electric shock.
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LAN Connection
The RJ‑45 connector is used to connect the Spectrum Master to a local area network. Integrated into this connector are two LEDs. The amber LED shows the presence of a 10 Mbit/s LAN connection when on, and a 100 Mbit/s LAN connection when off. The green LED flashes to show that LAN traffic is present. For additional information about the LAN connection, Ethernet connection, and DHCP, refer to Ethernet Configuration.
USB Interface – Type Mini‑B
The USB 2.0 interface can be used to connect the MS272xB Spectrum Master directly to a PC. The first time the MS272xB is connected to a PC, the normal USB device detection is performed by the computer operating system. 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.
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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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USB Interface – Type A
The MS272xB 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.
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.
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.
Ext Ref In
The External Reference In port is a BNC female connector that provides for input of an external frequency reference. Press the Ext Ref Freq submenu key (in the System menu) to select the frequency of the external reference from the list that is presented. Valid frequencies are 1 MHZ, 1.2288 MHz, 1.544 MHz, 2.048 MHz, 2.4576 MHz, 4.8 MHz, 4.9152 MHz, 5 MHz, 9.8304 MHz, 10 MHz, 13 MHz and 19.6608 MHz at amplitude from – 10 dBm to + 10 dBm.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
RF In
50 Ω Type‑N female connector.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type‑N connector. Do not overtighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
GPS Antenna Connector
The GPS antenna connection on the Spectrum Master is type SMA. GPS is an instrument option.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the SMA connector. Do not overtighten the connector. The recommended torque is 8 lbf · in (0.9 N · m or 90 N · cm).
