Amptek X-123 Kullanıcı Kılavuzu - Sayfa 15

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as much, power dissipation decreases to less than half of this. The table above is for a typical detector, but
the actual value depends on the type of detector (e.g., its area) and varies between units.
Note that USB power is rated to 2.5 W, therefore the X-123 cannot be powered over USB.
5.8.1.
Turn-On Transients
The figure below illustrates the transient currents seen as the X-123 turns on.
When 5 VDC is first applied to the power input, a large transient current is drawn to charge up the 50 μF of
input capacitance, from the input capacitors on all the supplies.
About 400
sec later, the low voltage switching supplies turn on. The maximum inrush current is about 2 A,
with a duration of <100
current is limited, some of the supplies can be destroyed.
After the DP5 is powered up, it then powers up the PC5, based on configuration settings stored in the DP5.
Depending on the "Set Power-on State" configuration option, this either happens automatically (approx. 2
seconds after power is applied), or upon command from the host PC. The unit draws about 300 mA at 5 V.
When the cooling is turned on, I
In this figure, the set point was 230 K, the ambient 295 K, and a SDD on a two-stage cooler was used. After
about 50 seconds, the temperature approached the set point and so began regulating. The current
decreased to its steady state value, 400 mA.

5.9. Thermal Specification

5.9.1.
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 that can dissipate that much heat. 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.

6. Electrical Interface

6.1. Connectors

6.1.1.
Power Connector
6.1.1.1. Power Jack on X-123SDD: Hirose MQ172-3PA(55) [obsoleted in 2016, replaced by MQ172-
3PA(30)].
6.1.1.2. Mating Plug: Hirose MQ172-3SA-CV(50) [obsoleted in 2016, replaced by MQ172-3SA-CV(30)]
[The replacements are form/fit/function compatible.]
X-123 User Manual
sec. It is important that the external supply be able to provide this current. If this
goes to its maximum, drawing approximately 700 mA.
IN
14