VMIVME-3122 VME board

VMIVME-3122 VME board

The input voltage range (full scale voltage at the input of each channel) is determined
by both the analog input gain and the A/D converter voltage range:
INPUT VOLTAGE RANGE = CONVERTER VOLTAGE RANGE ÷ INPUT GAIN
For example, an input gain of x10 combined with a converter voltage range of ±5 V
produces an input voltage range of ±500 mV (±0.5 V).
CAUTION: Do NOT apply input voltages or gain combinations which exceed the
converter voltage range. For example: A gain of 10 with an input voltage greater than
1.2 volts exceeds the maximum converter voltage range. In these cases, the data
received will not be valid but may appear as valid data.
Input Configurations
The analog inputs can be configured as single-ended, or differential channels, as
shown in Table 2-4 on page 35. The configurations are selected in groups of four
consecutive channels by the positions of jumpers E1 and E2, and by the locations of
SIP (single-in-line-package) resistor networks.
Each LOW side input has a 22 MΩ resistor tied to AGND. The purpose of this resistor
is to provide floating input protection. If the input lead is not connected, the board
will see that channel at ground thru 22 MΩ resistor.