Remote Spectrum Monitor™ MS27201A User Guide : Instrument Overview : Front and Rear Panels
Front and Rear Panels
The MS27201A Remote Spectrum Monitor uses two connector panels to provide for all physical IO. These panels use a variety of connector types intended for their purpose.
RF Connectors
The main RF input connector can be Type N or Type K, depending on the frequency option that is installed. These are ruggedized 50 Ω connectors. Type N connectors are female and Type K are male. Additional IO is provided with SMA style connectors. The SMA connectors are 50 Ω female connectors.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the connectors. Do not overtighten the connector. The recommended torque for Type K is 8 lbf·in (0.9 N·m or 90 N·cm). The recommended torque for Type N is 12 lbf·in (1.35 N·m or 135 N·cm).
Front Panel
Figure: Front Panel Connectors shows the front connector panel on the MS27201A.
Front Panel Connectors
1. RF In Port
This is a 50 Ω ruggedized connector of the following:
Type N female with options 709 and 720
Type K male with option 743
Maximum Input: ±50 VDC, +23 dBm, +13 dBm with Preamp On
To prevent damage to your instrument, do not try to mate incorrect connector types or use pliers or a plain wrench to tighten the connector. Do not overtighten the connector. The recommended torque for Type K is 8 lbf·in (0.9 N·m or 90 N·cm). The recommended torque for Type N is 12 lbf·in (1.35 N·m or 135 N·cm).
2. Status Indicator
The status indicator illuminates when power is applied to the instrument.
3. Data Out Port
The Data Out port is used for IQ Streaming. Refer to IQ Capture/Streaming (Option 124/125 and 126/127). This is a multi-purpose, hot pluggable input/output (I/O) interface.
4. USB 3.0 Interface – Type A
The Remote Spectrum Monitor has two Type A USB connectors that accept USB storage devices for saving measurements, setup data, and screen images. To ensure the device or it’s data does not become corrupted, click the eject icon to eject (unmount) the USB device before it is unplugged from the USB port (see Title Bar).
5. GPS Antenna Connector
The GPS antenna connection on the Remote Spectrum Monitor is type SMA female. This connector also provides 5.0/3.3 VDC for an active GPS antenna.
6. Bias Voltage
The bias voltage connection is type SMA female. The power supply is set up to provide 1 V to 34 V with a resolution of 0.1 V. The maximum current is 1 A, but with at total maximum power of 15 W.
7. Trigger  In/Out
A TTL signal that is applied to the external trigger 50 Ω SMA connector causes a single sweep to occur. In spectrum analysis, triggering is generally 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.
8. Trigger  In/Out / Ref Out (10 MHz)
This port can be configured as a trigger in/out as above or as a reference output. The reference output port is a 50 Ω SMA female connector that provides 10 MHz at approximately –7 dBm to 0 dBm.
9. Ref In
The external reference input port is a 50 Ω SMA connector that provides for input of an external frequency reference. Refer to your technical data sheet for valid frequencies. The instrument automatically selects the frequency reference in the following order of priority: external, GPS, then the internal time base.
10. IF Out
This 50 Ω SMA connector provides internal IF output. The nominal frequency range is 325 MHz with FFT capture bandwidth ≤ 32 MHz and 300 MHz with FFT capture bandwidth = 100 MHz. The nominal RF output level is –4 dBm with a 10 MHz, –20 dBm input, and with 0 dB input attenuation and preamp off. The spectrum can be inverted in certain RF input bands.
Rear Panel
Figure: Real Panel Connectors shows the real connector panel on the MS27201A.
Real Panel Connectors
1. External Power
This is a 2.5 mm by 5.5 mm barrel connector, 15 VDC, 5 A, center positive, used to power the instrument.
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, the user is at risk of receiving a severe or fatal electric shock.
Refer to Turning On the MS27201A RSM.
2. LAN Connection
The RJ‑45 connector is used to connect the Remote Spectrum Monitor to a local area network or directly to a PC with an Ethernet crossover cable. See Ethernet Connection for more details.
3. Service Port
The service port is for Anritsu customer service use only.
4. Cooling Fan
The cooling fan ventilates the internal heat from the instrument. Keep the fan inlet and exhaust ports clear of obstructions at all times for proper ventilation and cooling of the instrument.
5. Security Lock
The security lock slot accepts standard laptop cable locks.