3-4
VL-1225/6 Analog Input/Output Board
PD — Pseudo Differential “Low Side”.
All “low side” pseudo-differential analog voltages are connected
together and brought to this pin for differential reference.
DAC0, DAC1 — Analog Outputs.
These signals are the 8-bit analog output signals from the two D/A
converters (VL-1225 only). Up to ±5 ma can be drawn from each of these outputs.
Analog Ground.
This signal is the on-board analog ground. In single-ended mode, all analog inputs are
referenced to this signal. The use of multiple ground connections is recommended to maintain a high
degree of signal integrity. In differential mode, a return path for the input bias currents of the on-board
instrumentation amplifiers must be connected to this pin. This is accomplished by wiring a 10K to 100K
W resistor between analog ground and the “low side” of each differential signal source. These resistors
should be located in close physically proximity to the signal sources. The cable shield can used for this
purpose. The analog outputs (VL-1225 only) are referenced to analog ground.
N/C — No Connection.
This signal is not connected to on-board circuitry. It has no function on the VL-
1225/6.
Installation – External Connections
Содержание STD32 VL-1225
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