Keithley 213 User manual

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Model 213 Quad Voltage Source
Quick Reference Guide
A GREATER MEASURE OF CONFIDENCE
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INTRODUCTION
This quick reference guide contains descriptions of the
features and operation of the Model 213. Also included is
a programming example using a PC controller.
Olggo. Keithley Instruments, Inc.
All Rights Reserved
Instruments Division
Cleveland, Ohio, U. S. A.
Document Number: 213-903-01 Rev. A
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TABLE OF CONTENTS
SAFETY WARNINGS ....................... 5
FRONT PANEL FAMlLtARtZATlON ........... 7
REAR PANEL FAMlLlARlZATtON ............. 9
DIP SWtTCH ......................... 9
ANALOG OUTPUT PORTS .............. 9
DlGtTAL INPUT/OUTPUT PORTS ........ 10
BASIC OPERATION ....................... 13
DAC PORTTRIGGERING ............... 13
INTERNAL SUFFER ................... 14
CONTROL MODES .................... 16
IEEE-488 PROGRAMMING .................. 19
DEVICE-DEPENDENTCOMMANDS ...... 19
SRQ MASK AND SERIAL POLL BYTE ..... 31
STATUS WORDS ..................... 32
KEYBOARD CONTROLLER PROGRAM ....... 38
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SAFETY WARNINGS
The following safety warnings should be obsewed before
using Model 213 Quad Voltage Source. Refer to main
manual for detailed safety information and complete op-
eration instructions.
The Model 213 Quad Voltage Source is intended for use
by qualified personnel who recognize shock hazards and
are familiar with the safety precautions required to avoid
possible injury. Read over the manual carefully before
using the instrument.
Before operating the instrument, make sure the line cord
is connected to a properly grounded power receptacle.
Exercise extreme caution when a shock hazard is pre-
sent. Lethal voltages may be present on connsctorjacks.
The American National Standards fnstitute (ANSI) states
that a shock hazard exists when voltage levels greater
than 30V FtMSor42.4Vpeakare present. Agoodsafety
practice Is to expect that hazardous v&age Is pre-
sent In any unknown clrcuii before measuring.
Inspect the connecting cables, test leads, and jumpers
for possible wear, cracks, or breaks before each use.
For maximum safety, do not touch the Quad Voltage
Source connections, test cables or connections to any
other instruments white power is applied to the circuit un-
der test. Turn off att power and discharge any capacitors
before connecting or disconnecting cables or jumpers.
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Do not touch any object which could provide a current
path to the commonside ofthecircuit undertestorpower
line (earth) ground.
Do not exceed the maximum signal levels of the instru-
ment, as shown on the rear panel and as defined in the
specifications and operation section of the instruction
manual.
tnstrumentation and accessories should not be con-
nected to humans.
Maintenance should only be performed by qualified SBW
ice personnel. Before performing any maintenance, dis-
connect the line cord and all test cables from the instru-
ment.
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FRONT PANEL
FAMILIARIZATION
Six LEDs on the front panel of the Model 213 Quad Volt-
age Source disolav the status of the interface fsee
Figure 1).
Ffgure 1. Front Panel Indicators
TALK-On when the unit is in the talker state, off whsn
the unit is in the idle or listener state.
LfSTEN - On when the unit is in the listener state, off
when the unit is in the idle or talker State.
SRQ - On when the unit has generated a service Is-
quest. oft when no SW is pending. (See Service Re-
quest Mask command for more information.)
ERROR-On when an error has occurred, off when no
error condition exists. (See Error Query command for
more information.)
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TEST - Used in conjunction with the Test command to
verify that communication. ..__ ___,
n haa haen established with the
unit. The TEST light will flash wher I the unit is calibrating
in the auto-calibration mode. It will then remain tit when
finished.
POWER-On when power is applied to the unit and the
power switch on the back panel is in the on position (de-
pressed). Off if power is not present.
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REAR PANEL
FAMILIARIZATION
DIP SWITCH
The Model 213 hasone S-position switch @WI) accessi-
ble from the rear panel. This switch determines the unit’s
IEEE address and its operating mode (normal or auto-
calibration). The switch is read only when the unit is pow-
ered on and should be set prior to applying power.
Figure 2 illustrates the factory default setting for SWI,
Figure 2. SW1 Factory Default Setttngs
ANALOG OUTPUT PORTS
The Model 213 can be thought of as four isolated digital
to analog converters occupying one IEEE-488 bus ad-
dress. Each port has a low (L), high (H), and ground
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(chassis ground) line. Cha*sis ground may be connected
lo the shield of shielded cable if this type of cable is used
lo carry the analog signals.
CAUTION
The maximum common-mode input
voltage (the voltage between output LO
and chassis ground) Is 500V peak. Ex-
ceeding this value may damage the In-
terface.
The pinouts for all four analog ports are labeled on the
real panel of the unit and are shown in Figure 3. Each
analog output is capable of sourcing and sinking a maxi-
mum current 0, ,OrnA.
PORT 1 PORT? PORT 3 PORT4
HLG HLG HLG HLG
. . . . . . . . . . . .
Figure 3. Analog Output Connector Pinout
DIGITAL INPUT/OUTPUT PORTS
The Model 213 has eight digital input lines and eight digi-
tal output lines.
Figure 4 illustrates the digital I/O edge connector as
viewed from the rear of the instrument.
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The digital output lines will drive two TTL loads. All digital
input lines are less than 1.5 TTL loads. Normal precau-
tions should be taken to limit the input voltages to -0.3 to
+i’.O volts. All IWOlines are referenced to digital ground
(pin 20).
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In addition to interfacing with TTL logic Iewts, the digital
output lines can be configured es high voltage/high cur-
rent outputs. These outputs can sink up to 1OOmA at WV
DC through the use of open collector drivers with integral
diodes for inductive load transient suppression. This al-
lows for interfacing the digital outputs with relays. lamps
and solenoids.
To configure the digital output lines for this purpose, it is
necessary to open the enclosure and reposition the
configuration jumper according to the procedure in
Section 6 of the Model 213 Instruction Manual.
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BASIC OPERATION
DAC PORT TRIGGERING
Triggering is the process of changing a DAC output at the
ccwrrence of a trigger event. The three trigger events
which can trigger a DAC port are: a Command Trigger
(@), an IEEE Group Execute Trigger (GET), or an exter-
nal trigger pulse applied tc the external trigger/SK2 in-
put. Any DAC port may be configured to trigger on one or
more of these trigger sources. These trigger sources and
their relationship to a DAC port are shown in Figure 5.
As shown in the diagram, the trigger sources are routed
to the ports using the trigger mask commands. The trig-
ger mask commands are illustrated as switches. They
are used to enable a trigger source to trigger the selected
DAC port. All trigger signals are then combined to allow a
port tc be triggered upon the occurrencs of any of the
three trigger events.
Operation of the Model 213 is controlled by an internal
lmssc timer. Each DAC port is updated at a maximum
rate of cnce every millisecond. When a trigger event cc-
curs, the DAC will output the programmed voltage within
1msec of receiving the trigger.
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Figure 5. Model 213 Trigger Structure
INTERNAL BUFFER
The Model 213 contains an internal buffer consisting of
81921ocations numbered 0 to 8191. The bufferisshared
by all ports. Each port may be given a different section of
the buffer or ports may use the same buffer locations
without conflict.
This buffer may be loaded with voltage values to be out-
put when the stepped or waveform modes are used. All
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data in the internal b”“W is SaYed in non-volatile RAM.
Therefore bufferdatawhichwaspreviously loaded will be
available at power on.
Figure 6 shows the factory default allocation of the inter-
nal buffer to each of the DAC ports on the Model 213.
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CONTROL MODES
Four modes of DAC port operation are available: direct,
indirect, stepped, and waveform. Each port is independ-
enf and may be operated in a different mode.
Direct Control Mode
In the direct control mode, a DAC voltage is output upon
receipt of the Execute (X) command. Direct control is ac-
complished by selecting the DAC port, the range or
autorange, specifying the DAC output voltage. and issu-
ing the Execute command.
Indirect control implies that the DAC output will change
only when a trigger event occurs. Indirect control is ac-
complished by selecting ihe DAC port. the rang8 or
autorange, specifying the DAC output voltage and the
desired trigger source. When the trigger event occurs,
the programmed voltage will be output.
Stepped Mode
In this mode, a sequence of DAC voltages is loaded into
the Model 213 internal buffer. After the voltages are
loaded into the buffer, the DAC output can then be
stepped through each of the values by using any of the
three trigger sources. When the last voltage in the buffer
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is output, th@ Model 213 will automatically return to the
first location, thereby allowing the sequence to be re-
peated. See Figure 7.
Figure 7. Example of Stepped Mode
Waveform Mode
The waveform control mode may be used tc control the
DAC in an automatic manner. A buffer is defined and volt-
age values are loaded into the buffer. Once the Model
213 is triggered, these preloaded voltage values are then
output at a regular interval. See Figure 8.
When’the last voltage in the buffer is output, the Model
213 will remain at that location if the number of cycle has
been reached. The voltage stored at this location is then
output continuously. lfthespecified number of cycles has
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“cl been reached, the Mode, 213 a”,CmatiO~ll~ CO”ti”-
UBSa, the first buffer location.
Flgure 8. Example of Waveform Mode
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IEEE-488 PROGRAMMING
DEVICE-DEPENDENT
COMMANDS
Trigger
(system command)
@
Command trigger. Triggers the ports in
the command trigger mask (Tmask).
This command does not require the Exe-
cute Ixl command to owate.
Autorange
(port command)
A0 Disableautorangefor selected DACpoll
Al (default) Enable autorange for selected DAC port
A? Returns current autorange setting.
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lufter Data
port command)
Png,volts Write volts value in buffer location for
selected DAC port.
kng,#val Write decimal bit value in buffer location
for selected DAC port.
~mg,#$valZ Write hexadecimal bit value in buffer lo-
cation for selected DAC port.
3? Returns the range and value at the loca-
tion pointer for the selected DAC port in
the format specified by the Output For-
mat (On) command.
NOfS%
1. This command increments the loca-
tion counter after the value is written
lo or read from the buffer.
2. Factory default vlaues are mg=O,
volts=0.
3. Valid values are mg=O-3, volts=
number without a V mefix.
Control Mode
(wart command)
CO (default) Direct mode
Cl Indirect mode
C2 Steooed mode
C3
C?
.~.
Waveform mode
Returns current control mode for se-
lected port
Notes:Selecting a control mode slops
the prior mode activity and rearms the
Dart for the selected mode.
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