Measurement-computing IOtech 640 Series Manual de usuario descargar pdf (Pagina 19)

640 & 650 Series 878893 Connectors, Indicators, and Cables 3-1

Connectors, Indicators, and Cables 3

Front Panel Connectors and Indicators …… 3-1

The Rear Pannel …… 3-2

Unit Underside …… 3-3

Accessories …… 3-4

Front Panel Connectors and Indicators

640 and 650 Front Panels

The actual model number includes an “e” or “u” to indicate Ethernet or USB version.

The 640 and 650 Front Panels include the following connectors and LED indicators.

ANALOG COMMON

: Common analog ground.

ANALOG SIGNAL INPUT CHANNELS

: These BNC connectors are used for voltage input. The 640

models have 4 input channels. The 650 models have 5 input channels.

The BNC center-conductor is the signal HI and the BNC shell is the signal LO. Each BNC shell is

connected to the chassis ground through its own channel-dedicated 1 kΩ resistor. Consequently, the shell

is not meant to be driven with respect to earth ground more than ±10V.

An additional consideration pertains to input transducer setup. If the transducer case is effectively earth

grounded through its connection to a device under test, there exists the possibility for added measurement

noise due to the ground loop that is created. The pseudo-differential input rejects much of this noise.

Electrically isolating the transducer from the test device minimizes noise.

OUTPUT (640 units only)

: The 640 units include a programmable voltage source that can be set in

discrete amplitudes (see specifications). The output waveform parameters are controlled by software and

can be sine, swept-sine, random, burst, or arbitrary. The output can be used as a test source for the input

channels or as excitation for other system elements, such as the amplifier for a shaker table. Detailed

information on the excitation source and its operation can be found in the applicable eZ software

documentation, e.g., the eZ-Analyst User’s Manual.

NOTE: The output value is not guaranteed unless the Power LED has lit.

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Measurement-computing IOtech 640 Series Manual de usuario Pagina 19