Agilent Technologies Switch/Measure manual 34952A Multifunction Module, Digital Input/Output

10Multifunction 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 Not- 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.

N O TE	When a gate is not connected, the gate terminal is pulled to the
	enabled state, effectively creating a “gate always” condition.

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.

198 34980A User’s Guide