Tektronix Keithley DIM1 Digital Input Module 1 Rev. C User manual

DIM1
Digital Input Module 1

The DIM1 Digital Input Module provides 16 channels of digital input with resistor pro­grammable thresholds from +5 to +28V. As shipped, the module is configured for 5V
TTL inputs. Each channel can be optically isolated from system circuitry and other in­put channels. The settling time of the isolation circuit is 5psec, allowing sampling of
high-speed digital inputs.

All connections are made to on-card screw terminals which accept 16-24 gauge wire
leads.

The DIM1 module can be installed in any available slot in the system. To install the
module, insert it into the slot connector with the component side facing the power
supply. Generally, digital modules should be placed in the high-numbered slots if any
analog modules are present.

CAUTION: Always turn off the baseboard power before installing or removing
modules. To minimize the possibility of excessive EM1 radiation, replace and secure
the top cover before operating the unit.

User-Configured Components

Resistors RlOl-R116 can be configured by the user to provide a variety of input
thresholds, permitting the connection of digital inputs from +5V to +28V DC. The
module is shipped with 2703 resistors already installed, allowing TTL level inputs on all
input channels. See Table 1 for user-configured components on the DIM1 module.

There is one bank of screw terminals at the top of the DIM1 module. 32 screw ter­minals for the positive and negative inputs for each channel on the module as we11 as

+5V and ground. These terminals accept 16-24 gauge wire stripped 3116 of an inch.

Figure 1 shows the locations of these components. In addition, two jumper networks,

WlOl and W102, connect the + terminals of the inputs together.

Table 1. User-Configured Components on the DIM1 Module
Component Designation Function

Resistors RlOl-R116 Voltage programming resistors for each input

Screw Terminals

+5V, GND
Jumper Network
Jumper Network

J136

Terminals
WlOl
w102

channel
Positive and negative input connections
Internal power supply connections
Connects + inputs of channels O-7 together
Connects + inputs of channels 8-15 together

Document Number: 500-933-01 Rev. C DIMl-1

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EXTERN

TTL OUTPUT

Figure 2. Typical Non-isolated TTL Connections

Isolated Connections

In some cases, one may want to completely isolate the inputs by maintaining the Series
500 system at a ground potential separate from the equipment connected to the DIM1
module. With this configuration, leave WlOl and W102 installed but connect the + ter­minals of channel 0 and 8 to the +5V supply (or other voltage, if so programmed) com­mon to the incoming signals. With this configuration, DIM1 current consumption is
reduced to 60mA. Figure 3 shows isolated connections.

CAUTION: Make sure the +5V module supply terminal is not connected to the + in­put terminals with this configuration. Input signal high should be connected to the ­terminal of the desired channel. Note that no ground connection to the module should
be made with this configuration.

If channels are to be totally isolated from one another, remove WlOl and W102 and con­nect the external supply voltage for each channel to the individual channel + terminal.

DIMl-3