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AIM3A
Analog Input Module
Introduction tionalresistorlocationsprovidedon themodule.Theinput
signals are connected to removable screw terminal ships.
The AIM3A analog input module accepts input signals of Alternately, a user-installed mass termination connector is
flOOmV full scale through klOV full scale, and outputs a available for single-ended channels0-7 and 16-32, or differ-
signal of flOV full scale to the A/D converter module in ential channels O-7. The mass termination connector uses
slot1 ofthedataacquisitionsystem.TheAIM3Acanaccept the pin out format of the Analog Devices 3B mainframe
32 single-ended (common ground) inputs, or 16 differen- ribbon cable connector to permit direct connection of the
tial (floating) inputs, or a mixture of both. All AEvl3A AlM3A to a 3B signal conditioning subsystem.
functions,includinggainofxl,x10,andx100,areprogram-
mable, permitting single-ended and differential inputs to
be intermixed with a different gain setting for each chan- Hardware Compatibility
nel. Full 16-bit precision results from the AIM3A's low-
noise instrumentation amplifier, linearity of 0.005%, and The AIM3A can be used in slots 2 through 10 of the 500A
attention to design, signal routing, and shielding. When and 5OOP. Up to 9 AJM3A modules can be used in these
used with an AMMlA (AMMZ) A/D module, the AIM3A systemsforamaximumof3@4analoginputchannels(32SE
will support 5OkHz (62.51d-12) measurements at any gain channels per AIM3A plus 16 SE channels on the AMMx in
and channel mix. slot 1). For best performance, analog modules should be
mounted in the lowest-numbered available slots. The
Alh43A can also be used in the option slot of the Model 575
The AIM3A can be configured to accept current inputs by or576forupto48analoginputchannels(32SEchannelson
installing appropriate current sensing resistors in the op. the AlM3A plus 16 SE channels on the AMMx).
Document Number: 501-918-01 Rev. C / 3-92
Copyright 0 1989 Keithley Instruments, Inc., Cleveland, OH 44139 (216)248-0400 AIM3A-1
SH 0 0 SH
0 I 0 I 0 o-
1 0 0 l-
2 0 o 2-
3 I 0 I 0 3-
qo 4-
0 5-
0 6-
LJ 0
0
7-
NC
AlM3A
Analog Input Module
Software Compatibility terminal block, first strip 3/16 of insulation from the end of
the wire which you want to attach. Loosen the desired
Full control of the AIM3A requires software specifically terminal screw on the block and insert the bare end of the
designed for this module. Keithley's KDAC500 software wire into the corresponding hole. Tighten the screw se-
fully supports the AlM3A. If you are using third-party curely to compress the tab against the wire.
software, be certain that the software fully supports the
AIM3A.
After you have attached all the desired signal wires to a
terminal block, replace the terminal block by lining it up
AIM3A Specifications with the mating pins on the AIM3A and pressing it back
into place.
(Specifications apply for 18" to 28"C, 1 year)
Input channels: 16 differential or 32 single-ended, software Alternate connections are available through the optional
selectable cable mass termination connector Jll. Note that Jll con-
nects only to channels 0 through 7 and 16 through 23 in
Input characteristics:
single-ended mode, or 0 through 7 in differential mode.
Input Protection: lt3OV max (powered), i-15V max
This connector is available from Scotch/3M as Part Num-
(unpowered)
ber 3429, and can be easily field-installed if it is needed.
Input Resistance: IOOMR
Input Bias Current: 5OnA
Software selectable gains: xl X10 xl00 Installation
Input range (+V): 10 1 0.1
Gain accuracy (% rdg): 0.05 0.01 0.01 All features and operating modes of the AlM3A module
Gain Nonlinearity (%): 0.005 0.005 0.005 are programmable with the exception of jumpers Wl and
Gain Tempco (%/"C): 0.002 0.002 0.002 W2 and resistor sockets J5 JlO. Jumpers Wl and W2
Input offset @IV): 250 25 25 connect input low to module ground, and are normally left
Offset Tempco QV/"C): 50 6 2 in place. They may be removed for measurements where
Input noise remote ground sensing is needed. A jumper may be plain
@V RMS, 1OOKHz BW): 24 2.7 1.3 wire, or may resemble a resistor.
Settling time to .Ol%: 15ps 15ps 15la
CMRR (DC to 60Hz): 70db 90db 100db
Sockets J5 JlO are used for current sensing resistors, or for
Power up conditions: gain = Xl, input channels = differ- ground reference resistors for some types of differential
ential, channel selected = channel 0. measurements. These are special situations which are
covered under the "Applications" topic later in this man-
ual.
Standard Connections
CAUTION
The input connections to the AIM3A are made through
Turn off power to the data acquisition system
quick-disconnect terminal blocks Jl, J2, J3, and J4,or through
before you insert or remove any module. To
mass termination Jll.
minimize the possibility of EM1 radiation,
always operate the data acquisition system
with the cover in place and properly secured.
A quick-disconnect terminal block can be removed from
the AlM3A to facilitate making connections. Pull the block
straight off the board with a firm, even pressure. Do not pry
CAUTION
the terminals with a screwdriver or sharp object, or you
Make sure you have discharged any static
may damage the circuit board.
charges on your body before handling the
AIM3A. You can do this most easily by simply
touching the chassis of a computer or data
Note that each individual terminal on a terminal block
acquisition mainframe which is plugged into
consists of a small metal block with a hole and metal
compression tab within the hole. To make connections to a
AIM3A-3
AIM3A
Analog Input Module
a grounded, 3-wire outlet. Avoid touching The AIM3A has a single, differential instrumentation am-
components or the card edge connector of the plifier that amplifies all input signals, whether single-
module. ended or differential. A differential amplifier responds
only to the difference in voltage between two signals
connected to its non-inverting (+) and inverting (-) inputs.
NOTE The common mode voltage is the average of the two input
Analog input modules should be placed in the voltages. The actual voltage at each input is not important
lowest-numbered availableslots. Thisposition- as long as the common voltage is within the common mode
ing will provide the shortest distance to the range of the amplifier. The common mode range of thi
Analog Master Measurement module in slot 1, AIM3Awillnotbeexceededaslongasallinputsarewithin
and will also minimize any possibility of noise the range -lOV to +lOV referenced to module ground.
pick-up from the power supply or other mod-
l&S.
For example, if the input to the (+) input is 9 Volts and the
input to the (-) input is 8 Volts, the amplifier will amplify
For a compatible multi-slot data acquisition system (e.g. the +1 Volt difference signal and reject (ignore) the 8.5 volt
Model 5OOA or 5OOP), remove the top cover of the system common mode signal at both inputs. The ability to reject
by loosening the cover retaining screws located in the the8.5Volt commonsignal isreferred toasCommonMode
upper corners of the rear panel. Slide the cover back about Rejection.
one inch and then lift it off. Insert the AIM3A module in the
desired slot with the component side facing the system
power supply. Replace the system cover. When the AIM3A amplifies a differential input signal, the
(+) input of the amplifier is connected to the selected (+)
channel on terminal block Jl or J3, and the (-) input of the
In a single-slot system such as the Model 575 or 576, first amplifier is connected to the corresponding (-) channel
attach the supplied right-angle bracket to the AIM3A (see terminal on J2 or J4. For example, if channel 2 and differen-
Figure 2). Install the AIM3A in the option slot, with the tial mode are selected, the (+) input of the amplifier is
component side of the board facing upward. Secure the connected to pin 7 of Jl, and the (-1 input of the amplifier is
bracket to the rear panel of the system. Close and secure the connected to pin 4 of JZ. As long as the voltage at either pin
cover. is within +lO to -10 volts as measured to the module
ground (pin 10 of Jl and J3, or pin 1 of J2 and J4), the
amplifier will amplify the difference between the inputs.
End View Top View When the AIM3A amplifies a single-ended input signal,
the (+) input is connected to the selected channel on termi-
I nalblockJ1, J2, J3,or J4,and the (-1 inputisconnected toone
of common input low connections available on Jl, JZ, J3, or
-e screws 14.
screw
Bracket
Threaded Hole
The jumpers Wl and W2 provide a user-removable con-
nection between the input low connections and module
ground,andshouldnormallybeleftlnposition.TheAIM3A
`@we 2. Model 575 Mounting Bracket amplifier will now amplify the voltage difference between
the selected (+) input terminal and module ground.
Applications As an example, if channel 30 and single-ended mode are
selected, the (+) input of the amplifier is connected to pin
The following brief description of the AIM3A's amplifier 8 of J4, and the (-) input of the amplifier is connected to pin
circuitry will help you make the most effective use of the 10 of J4 (or pin 1 of J3, since these two pins are internally
module. connected). Pin 10 of J4 and pin 1 of J3 are jumpered to
module ground by WZ. The amplifier will amplify the
difference between pin 8 of J4 and pin 10 of J4.
AIM3A-4
AlM3A
Analog Input
Module
There are two groups of 16 single-ended input channels, Single-ended Input, Remote Ground Sensing, Using
and each group has its own (-) input connection. Single- Terminal Blocks
ended channels 0 through 7 and 16 through 23 form one
group, with their (-) input connection brought to pin 1 of Jl Figure 4 shows four single-ended inputs connected to the
and pin 10 of J2. Jumper Wl connects this (-) input connec- AIM3A using a remote ground sense line. All 16 single-
tion to the module ground as supplied from the factory. ended inputs on Jl and J2 use a single ground sense line.
Single-ended channels 8 through 15 and 24 through 31 This method is useful when up to 16 voltage sources to be
form the second group, with their (-) input connection measured are all located at a single remote location, with
brought to pin 1 of J3 and pin 10 of J4. Jumper WZ connects one side of each signal source connected to ground at the
this (-1 input connection to the module ground as supplied remote location. There may be a voltage difference be-
from the factory. tween the ground at the remote location and the ground on
theAlM3A. This will cause an error in the voltage readings
if the connection in Figure 3 is used.
CAUTION
To minimize the possibility of EMI radiation,
use shielded cable for input signals. Connect In Figure 4, the ground connection on theAIM3A is discon-
the shield to module ground, but do not con- nected by removing jumper Wl. The ground at the remote
nect the shield at the opposite cable end to location is carried to the AlM3A by the remote ground
anything.Themaximuminputvoltageallowed sense wire. The AIM3A will measure the difference be-
with module power on is i30 Volts, or 225 tween the remote signal, and the remote ground, and
Volts with module power off. If any input eliminate the error caused by the difference in ground
exceeds f10 Volts, all inputs will be lnopera- voltage between it and the remote location. Two groups of
tive. 16 single-ended inputs can be wired this way, with the first
group using Jl, J2, and Wl, and the second group using J3,
J4, and W2 Refer also to Figures 10 and 11 later in this
There are several choices for the method of connecting manual.
inputs to the AIM3A. You must decide which method will
yield the best results for a given application. To achieve 16-
bit performance, care must be taken to minimize error Differential Inputs, Using Terminal Blocks
sources caused by ground loops and shielding problems.
The guidelines for choosing connection methods are as When there are multiple inputs with different ground
follows: points, or the actual ground points are not known, the
differential input wiring can be used to prevent ground
loop errors and reject common mode noise. Figure 5 shows
Single-ended Input, Local Ground Sensing. Using two inputs connected as differential input channels 2 and
Terminal Blocks 3. Either the (+) or the (-) input on any differential input
maybeconnected toground,orbothmay bediiferent from
For input sources which can be grounded, but are not ground. A restriction does exist, however. No input termi-
connected to a ground of their own, the connections shown nal on the AIM3A can be connected to a voltage beyond
in Figure 3 will give good results. The AIM3A provides the +lOVor-10Vwithrespecttothe.4IM3Agroundreference.
ground connection for the input sources. Two possible If this happens, reading errors may occur on the channel
connectionsareshown.SourcesVOandVl haveindividual which is greater than 10 volts. At about +15 or -15 volts,
cables going to each source. Up to 32 sources can be other channels will begin to read in error, and above +3OV
connected to a single AIh43A in this way. Four input or -3OV, the AIM3A will be damaged.
common terminals are provided, one on each connector.
Connectall thewiresfromasingleinputsource to thesame
connector, asshownfor Jl inFigure3. SourcesV16andV17 When the AtM3A is used to measure a floating source, the
show a cable with a single input common wire. This readings may appear noisy, or may fluctuate or rise until
connection method can be used for up to 16 sources in a they reach the maximum input permitted by the pro-
group where all the sources have one wire in common. The grammed gains. This problem results where the floating
sources in a single group must be connected to channels sourcehasnolow-impedancecurrentretumpathtoground.
which all use the same input common connection. There Over a period of seconds to minutes, the input of the
are two input common connections, one for channels 0 AIM3A charges off the input signal until the common
through 7 and 16 through 23, and a second input common mode voltage present at the input exceeds the allowable
connection for channels 8 through 15 and 24 through 31. level, and the module no longer functions properly. The
AIM3A-5
AIM3A
Analon Inaut Module
solution is to install a resistor for the affected channel from and should be determined empirically. These resistors can
inputlow toground.Thevalueof theresistormaybein the be mounted on headers which are plugged into the avail-
range of 5k-lOOk, depending on the signal characteristics, able resistor sockets on the AEvf3A.
Notes:
1. Jumpers Wl and W2 must be in position. Wl connects input common for signals connected to Jl
and J2 to module ground. W2 connects input common of J3 and J4 to module ground.
2. All shields for singleended signals connected to Jl are attached to pin 10 of Jl, The shield input
on any connector is the right-most pin (Le. closest to the strain relief block of the AIM3A).
3. All input common lines for single-ended signals connected to Jl are attached to pin 1 of Jl, The
input common on any connector is the left-most pin (i.e. furthest from the strain relief block of the
AIM3A).
`igure 3. Single-ended, Local Ground Sense, Using Terminal Blocks
AIM3A-6
AIM3A
Analog Input Module
Wl Removed for remote I--- A+
Ground sense with Jl & J2
Remote Ground
Sense
Notes:
1. Jumpers Wi and or W2 must be removed for this mode of operation: Remove Wl if connections
Ji and J2 are used, or W2 if J3 or J4 are used.
2. The input common on any connector is the left-most pin (Le. furfhest from the strain relief block
of the AIM3A.
3. The shield input on any connector is the right-most pin (i.e. closest to the strain relief block of
the AIM3A.
`igure 4. Single-ended, Remote Ground Sense, Using Terminals
AIM3A-7
AIM3A
Analog Input Module
Notes:
1. Jumpers Wl and or W2 may be in or out for this setup.
2. Input Common terminals have no effect for differential measurements.
3. The input common on any connector is the left-most pin (i.e. furthest from the strain relief
block of the AIM3A.
4. The shield input on any connector is the right-most pin (i.e. closest to the strain relief block of
the AIM3A.
igure 5. Differential Inputs, Using Terminal Blocks
Single-ended Inputs, Using Mass-termination The pin out of Jll when used for single-ended inputs is
shown in Figure 6. The pin out of Jll when used with
A location is provided near the strain relief block of the differential inputs is shown in Figure 7. AU the input signal
AIh43A module for an optional mass termination connec- connections previously described in Figures 3,4, and 5 can
tor Jl 1. Connector Jl 1 has its pins wired in parallel with the be implemented with Jll. When Jll is used with the
connections on Jl and JZ, and provides a method for AnalogDevices3B subsystem, the single-ended input with
quickly connecting up to 16 single-ended or 8 differential remote ground sensing configuration is used, and Wl
signals to the AIM3A. The pin out of Jll is identical to that must be removed.
of the Analog Devices 38 subsystem connector. When Jll
is used, the remaining input terminals on J3 and J4 of the
AIh43A may still be used in the usual fashion.
AIh43A-8
AlM3A
Analog Input Module
Remove Wl if remote ground is used
Pinout of user-installed connector
( ~$$?$zd
Typical Input Wiring :
To Input 6
Remote ground,
if used
To Input Common
Notes:
1. Connector is user-installable. ScotchWM Part Number 3429.
2. Connectors J3 and J4 can be wired for other operating modes.
3. Jumper Wl connects input common to module ground. Remove Wl if remote ground sensing is
used
`igure 6. Single-ended Hook-up, Using Mass Termination
AIM3A-9
AIM3A
Analog Input Module
Wl and W2 have no effect on
differential measurements
Pinout of user-installed connector
/
Typical Input Wiring :
To Input 5+
To Input 5-
To Shield
Notes:
I, Connector is user-installable, Scotchl3M Part Number 3429.
2. Connectors J3 and J4 can be wired for other operating modes.
3. Jumpers Wl and W2 have no effect on differential measurements.
`igure 7. Differential Hook-up, Using Mass Termination
Current Measurement Using Terminal Blocks common mode voltage limitation applies as described
before; that is, no input terminal can be more than 10 volts
TheAIM3A can measure currents by using current sensing positive or negative with respect to the module ground.
resistors to convert the current to a voltage. The voltage
drop across the current sensing resistor may then be meas-
ured and converted to a current. DIP sockets and DIP The example in Figure 8 shows two 4-20 ma current loop
headers are provided on the AIM3A to mount the current sensors being connected to single-ended channels 0 and 1.
sensing resistors. If all the currents being measured have a An external power supply is needed to power the sensors.
common rehzrn path, the connection method shown in Up to 16 current loop sensors can be connected to Jl and J2
Figure 8 can be used. If the currents being measured have and use the common current return path as shown. 16
different return paths, the connection method shown in additional current loop sensors can be wired to J3 and J4,
Figure 9 must be used. In both connection methods, the and use the second common current return path. When the
AIM3A-10
AIM3A
Analog Input Module
Remove Wl for single-ended
current loop senscrs
connected to Jl & J2
I, \
I+
4 20mA
current
senscrs
External
voltage source
to power senscm
Sensc
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