Amptek X-123 Manual del usuario - Página 10

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Ethernet
Standard Ethernet connector (RJ-45)
USB
Standard USB 'mini-B' jack. (The X-123SDD is 'self-powered': it draws no power from the USB.)
RS-232
Standard 2.5 mm stereo audio jack. The X-123 is supplied with an adapter that connects this to a
DB9 serial connector.
3.4

Thermal

The X-123 dissipates up to 3.5 W of power. It is important that the body of the X-123 be attached to
a heat sink. If proper heat sinking is not used, then the X-123 chassis temperature rises, and thus the
detector temperature rises and spectroscopic performance is compromised.
4

Electrical Interface

Only the power interface differs from that described in the family wide manual.
4.1

Power Interface

A schematic illustrating the circuit at the power input is shown below. The PWR_IN line goes through
a protection circuit, then to different switching power supplies in parallel. Five of these are located on
the DP5, five on the PC5. Each has a 4.7 F input capacitor. Some turn on as soon as power as applied,
while others are under control of the microprocessor.
□
Protection: The protection device protects against reverse input polarity and has over- and under-
voltage lockouts. The X-123 will not power on with an input voltage below 3.8 V or above 5.5 V. The
input protection network operates over the range of -40 V to +60 V. Beyond this range, damage to
the X-123 will occur
□
Grounding: The chassis ground of the X-123, which is tied to the box and to the other boards, is
connected to the return current pins in the power connector.
1
This applies to X-123s from 2016 or later. Earlier X-123s contained a DP5 Rev C (or earlier), which did not have
the over- and under-voltage protection (this was added to the DP5 Rev D.) An input voltage higher than 5.5 V may
damage these units. The earlier DP5s did have reverse polarity protection.
X-123 User Manual
Contact
Signal
Tip
TXD (output from X-123)
Ring
RXD (input to X-123)
Sleeve
GND
1
.
10