TD250 V8 Manual
7
Rev 2, 31-09-2020
7
Rear Panel
The rear panel includes a chassis earth connector that can be used to improve shielding, particularly
when using an alternative power supply with an isolated output. This connector will accept a wire lug,
4mm plug, or stripped wire. The negative terminal of the power input connector is also connected to
the chassis. Since the negative output terminal of the included power supply is connected to earth,
the chassis is normally earthed.
The included power supply is Meanwell GST120A15-R7B. The power input connector is CUI PD-40S,
which suits a 4-pin DIN male plug,
8
Grounding and Earthing
The chassis ground of the TD250 is electrically connected to the negative terminal of the power
supply inlet. The negative terminal of the included power supply (GST120A15-R7B) is internally
connected to earth, which earths the chassis of the TD250. The chassis can also be earthed by the lug
on the rear panel, which is required if an isolated AC power supply is used.
The input signals should be connected between an input pin (pin 1-6) and signal ground (pin 7). The
load should be connected between an output pin (pin 1-6) and signal ground (pin 7-9). The BNC
connector grounds are normally connected to chassis ground, and hence earth.
Figure 3. TD250 Chassis and signal ground configuration
Signal ground
AC-DC
Signal
Chassis ground
TD250
