Quick Start Guide 2-12 VNA Master Connectors
MS20xxC UG PN: 10580-00305 Rev. L 2-25
2-12 VNA Master Connectors
External Power
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 2-13, item “11”
on page 2-20. 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.
Ext Trigger (50 ohm)
Refer to Figure 2-13, item “4” on page 2-20. 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 2-13, item “3” on page 2-20) 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 2-13, item “5” on page 2-20) 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 Appendix A). 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.
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.
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