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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
DR4 Driver/Receiver Board E-7
DR4 Characteristics
Table E-1: DR4 Characteristics
Description
Characteristics
Digital I/O Type
Variable Voltage
Channels
48 SE or 24 DIFF per Driver/Receiver board
64 per VXI slot
Per channel relay isolation
Output Voltage Ranges
0 V to + 31 V
-15.5 V to +15.5 V
-31 V to 0 V
Output Level Granularity
Per channel (Drive High and Drive Low)
Output Voltage Swing
31 V max.
Output Resolution
< 10 mV
Output Accuracy
< ± 2% ± 100 mV
Output Drive Current
31V range ± 50 mA typical (Source/Sink)
20V range ± 65 mA typical (Source/Sink)
Output Impedance
(Selectable/Channel)
5 Ω; 50 Ω ±20%
Programmable Drive Current
Programmable per group (16 Channel)
Input Threshold Ranges
0 V to + 31 V
-15.5 V to +15.5 V
-31 V to 0 V
Input Threshold levels
Dual Threshold
Input Threshold granularity
Per 2 channels (CVH and CVL shared)
Input Threshold Resolution
< 20 mV
Input Threshold Accuracy
< ±2% ±200 mV
Skew (Chan. to Chan.)
< 5 ns
Pin Electronics Monitoring
(per channel)
All programmed levels
Output and Input levels
Temperature Monitoring
Per 16 channel group junction plane monitors.
Voltage Monitoring
Real time alarms for driver voltages. Internal
voltage measurements using internal ADC
Auxiliary I/O Channels
16 TTL