Tektronix AOM1 Analog Output Module 1 Addendum Rev. B User manual
Addendum to the AOMI Manual
The following information covers changes to the manual for the AOM1/2 and AOM1/5
modules:
ERROR IN DESCRIPTION OF STROBE OPERATION
The topics “D/A DATA” and “STROBE” on pages 6 and 7 of the AOMl manual imply that
the mechanism of updating an output channel depends on the strobe feature, which may be
enabled or disabled. This information is in error. The strobe operation is always enabled. A
channel will update & after the strobe line has been sent an “ISSUE DATA” command,
Several channels may be loaded with data and an ISSUE DATA sent to the strobe line, or
channel data may be updated individually, each followed by an ISSUE DATA,
This information is relevant only if you are writing your own low-level drivers for the AOMl
module. High-level software such as KDACSOO, ASYST, or Labtech Notebook handle
updating of output channels automatically.
Document SOO-929-02B Addendum to the AOMl Manual
(c) Keithley Instruments, Inc. Cleveland, OH April 2.5, 1991
AOMl
Analog Output Module 1
The AOMl Analog Output Module is available in two versions. The AOM1/2 provides
two channels, while the AOM1/5 provides 5 channels of high-speed analog output.
Each channel has an independent D/A converter.
The D/A converters offer true l2-bit resolution with a maximum nonlinearity of
~0.012%. Five switch-selected output ranges are available for each converter: 0 to +lOV,
0 to +5V, unipolar; *lOV, f5V, *2.5V, bipolar.
A system strobe feature, supported by two levels of data latching in the D/A converter,
allows any number of D/A channels to be updated simultaneously.
Signals are connected directly to the module via screw terminals mounted on the right-
hand side of the module board.
The AOMl module may be placed in any available slot in the system. To install the
module, first turn off the power and remove the top cover of the mainframe. Insert the
module in the desired slot with the component side facing the power supply. Generally, analog modules should be placed in the low-numbered slots to isolate them from
power supply thermal and noise effects.
CAUTION: Always turn off the system power before installing or removing modules.
To avoid possible EM1 radiation, never operate the system with the top cover removed.
User-Configured Components
Each D/A converter installed on the AOMl offers five output ranges: 0 to +5V, 0 to
+lOV, -5 to +5V, -10 to +lOV, and -2.5 to +2.5V. Switch Sets SlOES105 on the
AOM1/5 independently select the output ranges for channels O-4, respectively. On the
AOM1/2, SlOl and S102 select output ranges for channels 0 and 1.
All output connections are made to screw terminals. Two terminals are provided for
each channel: signal output and a common ground. All terminals accept 16-24 gauge
wire stripped to 3116 of an inch. See Table 1 and Figure 1 for a list of AOMl userconfigured components.
Document Number: 500-929-01 Rev. B
AOMl-1
Table 1. Summary of User-Configured Components on the AOMl
Name
Switch 101 SlOl
Switch 102 s102
Switch 103
Switch 104
Switch 105
Screw Terminals J145
*AOM1/5 only
Designation Function
s103*
s104*
s105*
Analog Output Range Channel 0
Analog Output Range Channel 1
Analog Output Range Channel 2
Analog Output Range Channel 3
Analog Output Range Channel 4
Output Connection Channels O-4
AOMl-2
Figure 1. AOM1/5 Module (AOMV2 is similar except, it has components only
for channel 0 and 1.)
Connections
Connecting terminals on the AOMl are shown in Figure 2, which illustrates a typical
connecting scheme. The use of shielded cable is recommended to minimize the
possibility of EM1 radiation. Connect the shield to AOMl ground. Leave the other end
of the shield disconnected.
LOAD
Figure 2. Typical AOMl Output Connections (Channel 0 shown)
Range Switches
The AOM1/2 has two switch sets, SlOl and S102 that control the output range of chan-
nels 0 and 1. The AOM1/5 has five switch sets, SlOlS105 that control the output range
of channels O-4 respectively. Each switch set has five individual DlP switches that control the range for that channel. The settings for these five individual switches are
shown in Table 2. Each channel is identical in operation. Note that changing ranges will
require calibrations described in the servicing section of this manual.
Table 2. DIP Switch Settings for Switch sets SlOl and S105
Output Range DIP Switches
0 to +5v
0 to +loV
*2.5V
*5v
*1OV*
1 2
Closed Open
3 4
Closed Closed Open
Closed Open Open Closed Closed
Open Closed Closed Closed Open
Open
Closed Open Closed Closed
Open Closed Open Open Closed
5
*Factory default settings
Note: DIP Switch settings are the same for all switch sets.
AOMl-3
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