This is a 2.1 mm by 5.5 mm barrel connector, 12 VDC to 15 VDC, < 5.0 A. The external power connector is used to power the unit and for battery charging. Refer to Figure: MS202xC Test Panel Connectors, item 1111. 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.
Warning
When using the AC-DC Adapter, always use a three-wire power cable 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.
Note
If the battery is completely depleted, then the VNA Master may not turn on even when the external power supply is plugged into the unit. In that case, allow the battery to charge while the instrument is turned off before attempting to turn on the instrument.
Ext Trigger (50 ohm)
Refer to Figure: MS202xC Test Panel Connectors, item 44. BNC female connector, TTL 3.3 V to 5 V, triggers on positive edge. Maximum input is +5 VDC. This connector is not active in all instrument modes.
Ext Freq Ref (50 ohm)
The BNC female connector (refer to Figure: MS202xC Test Panel Connectors, item 33) is used for connection of an external frequency reference. Press the External Reference soft key under the System menu and then the Application Options menu to set the reference to external (10 MHz). The amplitude of the External Reference should be between –10 dBm and +10 dBm.
RF Detector (DIN)
The RF detector connector (refer to Figure: MS202xC Test Panel Connectors, item 55) is used for Power Monitor measurements (Option 5). Refer to the table of available RF Detectors in the Technical Data Sheet for your instrument (refer to Supplemental Documentation). Note that this option was available only on the MS202xC models, and that the option has been discontinued. Option 19, High Accuracy Power Meter, is equivalent with superior functionality.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the RF detector connector. This 4‑pin DIN connector has a bayonet shell that locks in a manner similar to a BNC connector. Do not over tighten this connector.
Port 1 (50 ohm)
This Type‑N connector (see Figure: MS202xC Test Panel Connectors, item 66) provides the input/output 50 ohm interface for transmission and reflection measurements of the Vector Network Analyzer at Port 1. Maximum input is + 23 dBm at ± 50 VDC. Bias Tee output is also available from this port (with Option 10). The Port 1 green LED (see Figure: MS202xC Test Panel Connectors, item 1717) indicates, when lit, that the port is transmitting power.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type-N connector. Do not overly tighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
Port 2 (50 ohm)
This Type-N connector (see Figure: MS202xC Test Panel Connectors, item 99) provides the input/output 50 ohm interface for transmission and reflection measurements of the Vector Network Analyzer at Port 2. Maximum input is + 23 dBm at ± 50 VDC. Bias Tee output is also available from this port (with Option 10). The Port 2 green LED (see Figure: MS202xC Test Panel Connectors, item 1010) indicates, when lit, that the port is transmitting power.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type-N connector. Do not overly tighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
Type K Connectors (Option 11) for VNA Ports
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type‑K connector. Do not over tighten the connector. The recommended torque is 8 lbf · in (0.9 N · m or 90 N · cm).
Bias Input Port 1
The BNC female connector (see Figure: MS202xC Test Panel Connectors, item 77) is used for external bias tee input that will be routed to Port 1 of the VNA Master. Maximum input is ± 50 VDC, 500 mA.
Bias Input Port 2
The BNC female connector (see Figure: MS202xC Test Panel Connectors, item 88) is used for external bias tee input that will be routed to Port 2 of the VNA Master. Maximum input is ± 50 VDC, 500 mA.
Bias Status LED
This LED (see Figure: MS202xC Test Panel Connectors, item 1616) illuminates green when Internal or External Bias is selected. When using the internal supply, it illuminates red for any overload condition (current or voltage).
Headset Jack
Instrument models that include a spectrum analyzer will output demodulated audio to this 3.5 mm 2‑wire jack, which also accepts most 3‑wire headsets. (See Figure: MS202xC Test Panel Connectors, item 15.)