304 34980A User’s Guide
12 Multifunction Module with DIO, D/A, and Totalizer
34952A Multifunction Module
The 34952A Multifunction Module with DIO, D/A, and Totalizer combines
four 8- bit ports of digital input/output, a 100 kHz totalizer, and two ±12 volt
earth- referenced analog outputs. You can include digital inputs and totalizer
input in a scan list. You can make connections via standard 50- pin D- sub
cables or the optional 34952T terminal block.
Digital Input/Output
The Digital Input/Output (DIO) consists of four 8- bit ports with
TTL- compatible inputs and output. The open- drain outputs can sink up to
400 mA. From the front panel, you can read data from only one 8- bit input
port at a time. You can configure the DIO ports for 8, 16, or 32- bit operations.
The DIO channels are connected by internal 5 V pull- up resistors when
configured as inputs.
Totalizer Input
The 32- bit totalizer can count pulses at a 100 kHz rate. You can configure the
totalizer to count on the rising edge or falling edge of the input signal. A TTL
high signal applied to the Gate terminal enables counting and a low
signal disables counting. A TTL low signal applied to the Not- Gate
terminal enables counting and a high signal disables counting. The
totalizer counts only when both terminals are enabled.
Analog Output (DAC)
The two analog outputs are capable of outputting voltages between ±12 volts
with 16 bits of resolution. Each DAC channel is capable of 10 mA maximum
current. Use the two analog outputs to source bias voltages to your DUT, to
control your analog programmable power supplies, or as set points for your
control systems. The outputs are programmed directly in volts.
NOTE
When a gate is not connected, the gate terminal is pulled to the
enabled state, effectively creating a “gate always” condition.
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