Lake Shore 805 User manual

Obsolete Manual June 1987
This manual applies to instruments with Serial Numbers from 18000 and subsequent.
Obsolete Notice:
This manual describes an obsolete Lake Shore product. This manual is a copy from our archives
and may not exactly match your instrument. Lake Shore assumes no responsibility for this
manual matching your exact hardware revision or operational procedures. Lake Shore is not
responsible for any repairs made to the instrument based on information from this manual.
Lake Shore Cryotronics, Inc.
575 McCorkle Blvd.
Westerville, Ohio 43082-8888 USA
Internet Addresses:
[email protected]
[email protected]
Visit Our Website:
www.lakeshore.com
Fax: [phone]
Telephone: [phone]
Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc.
No government or other contractual support or relationship whatsoever has existed which in any way affects or mitigates proprietary
rights of Lake Shore Cryotronics, Inc. in these developments. Methods and apparatus disclosed herein may be subject to U.S. Patents
existing or applied for. Lake Shore Cryotronics, Inc. reserves the right to add, improve, modify, or withdraw functions, design
modifications, or products at any time without notice. Lake Shore shall not be liable for errors contained herein or for incidental or
consequential damages in connection with furnishing, performance, or use of this material.
User’s Manual
Model 805
Temperature Controller

TABLE OF CONTENTS
SECTION I - GENERAL INFORMATION
1.1 INTRODUCTION 1-1
1.2 DESCRIPTION 1-1
1.3 INPUT OPTION MODULES 1-2
1-4 SPECIFICATIONS 1-4
SECTION
II - INSTALLATION
2.1 INTRODUCTION 2-1
2.2 INITIAL INSPECTION 2-1
2.3 PREPARATION FOR USE
2-1
2.3.1 Power Requirements 2-1
2-3-2 Power Cord 2-1
2.3.3 Grounding Requirements 2-1
2.3.4 Bench Use 2-2
2.3-5 Rack Mounting 2-2
2.3.6 Sensor Input Connections 2-2
2-3-7 Sensor Output Monitors 2-3
2.3.8 SENSOR
ID Switches 2-3
2.3.9 Heater Power 2-4
2.4.1 Model 8053 RS-232C Option 2-4
2.4.2 Model 8054 IEEE-488 Option 2-4
2-4 OPTIONS 2-4
2.4.3 Model 8055 Linear Analog Output Option 2-4
2.5
ENVIRONMENTAL REQUIREMENTS 2-4
2.5.1 Operating Temperature 2-4
2.5-2 Humidity/Altitude 2-4
2.6 REPACKAGING FOR SHIPMENT 2-4
SECTION
III - OPERATING INSTRUCTIONS
3.1 INTRODUCTION
3-1
3.2 INSTRUMENT CONFIGURATION 3-1
3.2-1 Input Modules 3-1
3.3 PRECISION OPTIONS 3-1
3.4 CONTROL FUNDAMENTALS
3-1
3-5 CONTROLS AND INDICATORS 3-1

TABLE OF CONTENTS. CONT'D
FRONT PANEL DESCRIPTION
3.6 POWER ON/OFF Switch 3-1
3.6.1 POWER-UP Sequence 3-1
3.7.1
Display SENSOR Input 3-2
3-7.2
Units Select 3-2
3.7.3 Display
SENSOR
Units 3-2
3.7.3.1 Voltage Units 3-2
3.7.3.2 Resistance Units 3-2
3.7.3.3 Temperature Units 3-2
3-7.4 Filtering the Display 3-2
3.7 DISPLAY SENSOR Block 3-2
3-8 CONTROL BLOCK 3-4
3.8.1 CONTROL SENSOR 3-4
3-8.2 SET POINT 3-4
3.8-3 GAIN 3-4
3-8-4 RESET 3-4
3.8-5 HEATER % 3-4
3.8-6 HEATER POWER Range 3-5
3-9 LOCAL/REMOTE OPERATION 3-6
REAR PANEL DESCRIPTION
3.10 CONTROL Switch 3-6
3.11 HEATER Power Output Terminals 3-6
3.12 SENSORS/MONITORS 3-6
3.13 SENSOR CURVE SELECTION 3-6
3.13.1 Display of Accessed Curve 3-7
3.13.2 The Precision Option Table 3-7
3-14 SENSOR ID Switches 3-7
SECTION IV . REMOTE OPERATION
4.1 IEEE-488 INTERFACE (OPTION 8054) 4-1
4.2 GENERAL IEEE SPECIFICATIONS AND OPERATION 4-1
4.3 INTERFACE CAPABILITIES 4-1
4.4 805 IEEE-488 ADDRESS SWITCH 4-2
4.4.1 Terminating Characters (delimiters) 4-2
4.4.2 Talker and/or Listener Configuration 4-2
4-4-3 The IEEE-488 INTERFACE bus address 4-2
4.5 IEEE-488 BUS COMMANDS 4-2
4.5.1 Uniline Commands 4-2
4.5.2 Universal Commands 4-3
4.5.3 Addressed Commands 4-3
4.5.4 Unaddress Commands 4-3
4-5.5 Device-Dependent Commands 4-3
4.5.6 Talker and Listener Status 4-5
4-6 PROGRAMMING INSTRUCTIONS 4-5
4.6-1 Input Data Format and Program Codes 4-5

TABLE OF CONTENTS. CONT'D
4.7 INSTRUMENT SETUP PROGRAM CODES (see Table
4-4) 4-6
4.7.1 EOI Status . The ZN1 Command 4-6
4.7.2 Interface Mode . The MN1 Command 4-6
4-7.2.1 Local 4-6
4.7-2.2 Remote 4-6
4.7-2.3 Local Lockout 4-6
4.7.3 Terminating characters . The TN1 Command 4-6
4-7-4 Clear 4-6
4-8 SELECTION OFSETPOINTUNITSANDDISPLAYSENSOR(Table4-4) 4-6
4.8.1 Units for Set Point . The FOC1 Command 4-6
4.8-2 Display Sensor Selection . The F1C1 Command 4-6
4.9 The A and B SENSOR IDInformation . TheAC1C2 and BC1C2 Commands 4-6
4.10 THE CONTROL COMMANDS (See Table 4-5) 4-9
4.10.1 The Set Point Value
. The S Command 4-9
4.10.2 Setting the GAIN . The P Command 4-9
4-10.3 Setting the RESET (Integral) . The I Command 4-9
4.10.4 Heater Range . The R Command 4-9
4-10.5 Note: The Return to Local 4-9
4.11 Output Statement Request . The WC1 Command 4-9
4.12.1 Output Data Statements 4-10
4.12.1.1The "W0" Data String (Table 4-7) 4-10
4.12.1.2The "W1" Data String (Table
4-7) 4-10
4-12.1.3 The
"W2" Data String (Table 4-7) 4-10
4.12.1.4 The "W3" Data String Table 4-7) 4-11
4.12.1.5 The "WS" and "WP" Data Strings (Table 4-84-11
4.12-1.6 The "WI" Data String (Table 4-8) 4-11
4.13 Sample Programming 4-11
4.13.1HP86B Keyboard
Interactive Program 4-11
4.13.2 National Instruments IBM Example 4-11
4-13.3HP Example of 805 Commands 4-13
4.12 PROGRAM EXAMPLES 4-9
SECTION V . MAINTENANCE
5.1 INTRODUCTION 5-1
5.2 GENERAL MAINTENANCE 5-1
5.3 FUSE REPLACEMENT 5-1
5.4 LINE VOLTAGE SELECTION 5-1
5.5 PERFORMANCE VERIFICATION 5-1
5.5.1 Performance Verification Connector
5-2
5.5.2 Performance Verification Procedure 5-2
5.6 CALIBRATION 5-2
5.7 TROUBLESHOOTING 5-2
SECTION VI
. OPTION AND ACCESSORY INFORMATION
6.1 INTRODUCTION 6-1
6.2 OPTION INPUT MODULES 6-1
6-3 ACCESSORIES 6-1
6-4 OUTPUT POWER OPTION 6-2
6-5 OPTION INTERFACE CARDS 6-2

LIST OF TABLES AND ILLUSTRATIONS
SECTION I - GENERAL INFORMATION
Table 1-1. Input Option Modules, Model 805 Temperature Controller 1-3
Table 1-2.Specifications, Model 805 Temperature Controller 1-4
SECTION I1 - INSTALLATION
Table 2-1-Line Voltage Selection 2-1
Figure
2-1, Typical Rack Configuration 2-2
Table 2-2-Connector Plug Connections 2-2
Figure 2-2.Sensor Connections 2-3
Figure
2-3.Sensor IO Definitions 2-3
Table 2-3,SENSOR
ID Curve Address 2-4
SECTION III - OPERATING INSTRUCTIONS
Figure3-1.
Model 805 Temperature Controller - Front Panel 3-3
Table 3-1-Reset Settings. 3-4
Figure
3-2.Model 805 Temperature Controller - Rear Panel 3-5
Figure 3-3a. Nominal Gain Settings 3-6
Figure 3-3b. Nominal Reset Settings (Beats/Second) 3-6
Table 3-2.
Standard Curve Information 3-6
Table 3-3.Sensor CurveTable Information
- PrecisionOptionTable 3-7
Figure3-4, SENSOR
ID Definitions. 3-8
SECTION IV - REMOTE OPERATION
Table 4-1. Interface Functions.. 4-2
Figure 4-1. IEEE-488 Address Switch for the 805. 4-3
Table 4-2.
Allowable Address Codes for the 805 4-4
Table 4-3.IEEE-488 Bus Commands. 4-5
Table 4-4.805 Listener Program Code Summary
- Instrument Setup, Selection
of Set Point Units, Display Sensor and Setting
SENSOR ID. 4-7
Table 4-5.805 Program Code Summary, Cont'd.
Control Commands and Output Statement Request. 4-8
Table 4-6.
Remote Interface Input of the A and B SENSOR ID. 4-9
Table 4-7.805
Output Talker Data Statements. 4-12
Table 4-8.805
Output Talker Data Statements. 4-13
SECTION V - MAINTENANCE
SECTION
VI - OPTION AND ACCESSORY INFORMATION
Table6-1. Option and Accesories for Model805 Temperature Controller.. 6-1

SECTION I
GENERAL INFORMATION
1-1 INTRODUCTION
The informationcontained in thisoperations
manual isfor the installation, operation,
remote programming and optionand acces-
sory information for
the Lake Shore
Cryotronics, Inc.
Model 805 Temperature
Controller.
A separate Technical Service
Guide isavailablefor this instrument which
containsperformance and calibration
procedures, schematics, component layouts
and a replaceable parts list.
This section contains general informationfor
the Lake ShoreCryotronics, Inc.
805
Temperature Controller. Includedisan
instrumentdescription, specifications,
instrument identification, optionand
accessory information.
1.2 DESCRIPTION
The 805 Temperature Controller isa
microprocessor based instrument which
providestrueanalogcontrol.
It accepts
inputs from
up totwo sensors and displays
the temperature with up to4 digitsof
resolution
in K, °C or °F. It displays
voltage for diodes to 1
millivolt, andohms
for resistors to four places.
The dual sensor
input allowstheuserto
monitor temperature at more thanone point.
Sensor select pushbuttons on the front panel
enable the user todisplay either input at
will. The system control sensor isselected
via a rear-panel toggle switchwith the
choice indicatedon the front panel. This
choice isindependent of display status.
The Model 805 isdirect reading
in tempera-
ture when usedwith the Lake Shore DT-470
Series Temperature Sensors.
All DT-470
Sensors follow the same temperature
response curve. Four bands of tracking
accuracyare offeredsothat sensor selection
may be made with both technical and
economical considerationsfor any given
application. Low temperature (2to
100K)
accuracies range from 0.25K for band 11 to
1K for band 13. For more demanding
requirements, DT-470 Sensors can be indivi-
dually calibratedtoaccuracies of better
than
50 millikelvindepending on tempera-
ture range.
Diode sensor voltages aredigitizedwith a
resolutionof
100 microvolts out of 3 volts
full scale. For the display, temperature is
rounded to
0.1 kelvinabove 100 kelvin, and
to
0.01 kelvin below 100 kelvin.
For greater precision individual sensor
calibrations can be accommodated through
the 8001 Precision CalibrationOptionwhich
programs the instrument with a particular
response curve. The algorithmwithinthe
instrument interpolates between data points
toan interpolationaccuracy which exceeds
0.01K over the entire temperature range of
the PrecisionOption. The analog-to-digital
converter isaccurate toplus or minus the
least significantbit,which forthe470
series sensor results
in an uncertaintyof
1mK below 28K and45mK above 40K with a
transitional regionbetween the two
temperatures. Therefore, at temperatures
below 28K, the overall system accuracy, the
sum
of the instrument accuracy (11mK) and
that of the calibration itself (Lake
Shore
calibrationsare typically better than 20mK
withinthis region) is±0.03K. Above 28K,
system
accuracy gradually moderatesto a
typicalvalue of ±75mK above 40K. Seethe
Lake Shore Cryotronics, Inc. Low
Tempera-
tureCalibration Service brochure for
additionaldiscussion of calibrationaccuracy.
The 805 displayuses digital filteringwhich
averages up toten temperature readings.
This reading mode eliminates noisewithin
the cryogenic system analogous toaveraging
with a digital voltmeter. This algorithm
can be deselected (bypassed) by switch 2
of
the SENSOR ID dipswitch on the back
panel for a given
input if theuser prefers
not toaverage readings. Ablinking
decimal point at the upper leftof the
1-1

display indicates that averaging ison.
The Model805 can also be used with the
optional input conversion modules (-6) which
allow either input tobe converted tohandle
either the TG-120 series diodes
(orany
diode with a 0 to6 volt output), or positive
temperature coefficient metallic resistors.,
i.e., platinum (-P2 or -P3) or rhodium-iron
(-R1) resistors. The DIN curve isstandard
within the instrument and iscalled
up
automatically unless a precisionoption is
present forthe platinum resistor. The
accuracy
of the reading isdictated by the
sensor and itsconformity
tothe DIN curve.
The tolerance on these devices isgiven on
the technical data sheet for the Lake Shore
PT-100 series sensors. Thecombined
accuracy of the instrument and a calibrated
resistor with a precisionoption ison the
order of 40mK overthe useful range ofthe
sensor (above40K for the platinum). Note
that a precisionoption isrequired for a
rhodium-ironor a TG-120 toreadcorrectly
in temperature.
These
input conversionmodules are easily
installedby the user; thus, units can be
modified to satisfychanging requirements.
The ample memory space provided
in the805
allows several response curves to be stored
in one instrument. Depending on the
complexity of the curves, up totencanbe
programmed intothe unit. The
SENSOR ID
switches are used to select which particular
sensor response curve istobeusedwith
each
input. Thus, theuser isable tomake
sensor changes at
will even when different
response curves are required.
The data for calibratedsensors can be
stored within the instrumentby means of
the8001 PrecisionOption. Each curvecan
contain up to
99 sensor unit-temperature
data points. Withthe standardprecision
option format, which consists of 31data
pointsand a 20 character information line,
up totencurves can be stored
in the unit.
See Paragraphs3-6 through 3-10 for more
description.
A1though voltage (resistance)-temperature
data points arestoredas a table, interpola-
tionwithin the instrument results
in the
equivalent of a high order polynomial
calculation
in the converting ofthe input
voltage (or resistance) totemperature.
This isdone by means of a proprietary
algorithmdevelopedat Lake ShoreCryotro-
nics, Inc.
T he control temperature set - poi n t selection
ismade via thumbwheel switches on the
front panel oftheinstrument. The set-
point switches, which provide a continuous
indicationof the set-point value, enable the
user toquickly and easilydetermine
whether hissystem isatcontroltempera-
ture. The set-point isinthe same units as
is the Display sensor (kelvin, celsius,
fahrenheit, or volts [ohms]).
The control sectionof the805 provides
two-term temperature control. Proportional
(GAIN) and integral (RESET) are individual-
lytuned via front-panel potentiometers.
The gainmode isina nominal log per cent
with the reset being linear.
Analog heater output of
the 805 Tempera-
tureController isa maximum of
25 watts
when a 25 ohmheater isused. Adigital
meter on the front panel of the 805
continuously shows the heater power output
as a percentage of output range. Thus, the
user can conveniently monitor power applied
to hissystem. To accommodate systems
which require lower heater power, the
maximum heater output of the805 can be
attenuated intwo steps
of a decade each.
When greater power output isrequired,
an
optional 56 watt power output stage is
available (W60) which isdesigned
for a25
ohm load.
It isratedat a nominal 1.5
amperes and 45 volts.
An optional IEEE-488 (Model
8054) or RS-
232C (Model 8053) interface isavailable for
the 805. Either interfacecan beusedto
remotely control all front-panel functions.
1.3 INPUT OPTION MODULES
The input optionmodules forthe805
Controller are listed
in Table 1.1.
1-2

Table 1.1. Input Option Modules,
Diode or Resistance Sensor
(ordered separately):
DIODE SENSOR CONFIGURATION
DiodeExcitation:
DC current Source. 10
microamperes
(±0.005%). AC noise from
current source less than 0.01%
of DC
current.
Diode
Voltage Range: 0 to 3 volts in
standard configuration.
DiodeTemperature Range: Dependent on
Sensor selected. DT-470-SD covers tempera-
ture range from
1.4 to475 kelvin. Refer to
diode specifications for other temperature
limitations.
DiodeResponse Curve(s): The silicon diode
series DT-470 Curve #10 as well as the
series DT-500
DRC-D andDRC-E curves are
presentinthe805. Curves
to match other
existing Sensors are availableon request.
DiodeSensor Power Dissipation: Dissipation
isthe product of Sensor ExcitationCurrent
10
uA) and Resultant Sensor Voltage.
Accuracy:
Unit reads sensor voltage to an
accuracy of better than 0.1mV. Equivalent
temperature accuracy isa function of Sensor
type, temperature (sensitivity) and calibra-
tionof Sensor. Seethe Technical Data
Sheet for the DT-470 Series Temperature
Sensors and the Model 8001 PrecisionOption
for accuracy with
LSCI calibratedsensors.
6-VOLT DIODE SENSOR MODULE
-6 DiodeSensor Input Module, Similar to
standardconfiguration but has 0
to 6 volt
input toaccommodate TG-120 Series Sensors.
Converts either InputA or Input
6 (or both
with twomodules) toaccommodate the 6
voltmodification for TG-120 series sensors.
Requires calibratedsensor and 8001 Precision
Option for 805 tobe direct reading in
temperature. This modulemay be field
installed.
100
OHM PLATINUM MODULE
-P2 100 Ohm
Platinum Sensor Module:
Model
805 Temperature Controller
Converts either InputA or
6 (or both with
two modules) toaccommodate100ohm
PlatinumRTD Sensors. This modulemay be
field installed.
Tempera
t ure/Resistance Range: Temperature
range depends on Sensor. Resistance
in
one range from 000.0 to300.0 ohms.
Resolution: 0.01 ohm or equivalent
temperature.
Sensor (order separately): Configuration
optimizedfor
PT100 Series Platinum Sensors
or any other100 ohm (at
0°C) positive
temperature coefficient Sensor.
Sensor Excitation:
1 .0 mA (±0.005%).
Sensor Response Curve: PlatinumSensor
response curve isbased on 0.1
% inter-
changeability at 0°C and temperature
coefficient
(0-100°C) of 0.00385/°C.
Accuracy
conforms toDIN 43760 tolerances
plusdisplay (electronics). Special calibra-
tions can be accommodated with 8001
Precision Option.
Sensor Power Dissipation: Dissipation is
the product of sensor excitation current
squared and the Sensor resistance.
1000
OHM PLATINUM MODULE
-P31000 Ohm
PlatinumSensor Module:
Essentiallythe same as the -P2 except
accommodates
1000 ohm PlatinumSensor (or
any other 1000 ohmmetallic sensor).
Sensor excitation is0.1 milliampere.
Unit reads resistance inohms. Requires
calibrated sensor and programmed calibra-
tionto read temperature. Accuracy is
0.1
ohm or equivalent temperature.
27
OHM RHODIUM-IRON MODULE
-R1 27-ohm Rhodium-Iron Sensor Module:
Essentiallythe same as -P2 except accom-
modates RF-800-4 Rhodium-Ironsensor.
Sensor excitation is1mA. Unit reads
resistance
in ohms. Requires calibrated
sensor, etc. toread temperature. Accuracy
and resolution is0.003 ohms or equivalent
temperature.
1-3

1.4 SPECIFICATIONS
Instrument specifications are listed inTable
1.2. These specifications are the perfor-
mance standards
or limits against which the
instrument is tested.
Option portsaredesigned intothe805 to
ease the additionof interfaces and outputs.
The Model 805 has two option portswhich
allow
up to two options to be used
simultaneously (see limitations below). The
options are easily installedby the user; thus,
units can be changed
or upgradedto satisfy changing require-
ments.
Only one computer interface can be
installed inthe805 due to space limitations
in the805 rear-panel. TheModel 8055
Analog Output option isavailable toprovide
an analog output of 1mV/K
independent of
thedisplay temperature units. If the
display is insensor units, theoutput for
diodes is
0.1V/V; for 100 ohm platinum,
1mV/ohm; for
1000 ohm platinum,
0.1mV/ohm; for rhodium-iron, 10mv/ohm.
Table
1.2. Specifications, Model 805 Temperature Controller
INPUT CHARACTERISTICS:
Inputs: Two Sensor Inputs. Control Sensor
(A or B) selected via rear panel switchand
indicatedon the front panel. Displaysensor
(A or B) can be selected from front panel or
interface, independent of control sensor.
The
input characteristicsare a function of
Sensor Input Module Installed. The805 can
accommodate separate
input modules for the
A and B input. This allows concurrent use
of different sensor types.
Input ConversionModules: Standard
configuration for the805 is
both inputs set
up touse DT-470 series silicondiode sensors
(0-3V). Optional input conversionmodules
allow
the 805to be used with TG-120 series
diode sensors (0-6V), as well as PT-100
series 100/1000 ohm platinumRTD's, and
RF-
800 series rhodium-iron sensors.
Input ConversionModule
S en s o r Type
-6* 6 volt diodes
(e.g. TG-120)
-P2
100 ohm Platinum
-P3*
1000 ohm Platinum
-R1* 27 ohm rhodium-iron
*To readcorrectly ina
temperature
scale, thesemodules require the useof
calibrated sensors and the 8001 Precision
option for the 805.
Sensors: Ordered Separately. 805 with
input conversionmoduleswill handle all
types of diodes as well as platinumand
1-4
(one per input)
rhodium-iron RTD's and other positive
temperature coefficient resistors with
proper choice of input. Seethe Lakeshore
Cryotronics, Inc. Sensor catalog for details
on the above Sensors.
Sensor Response Selection: Rear-panel Dip
switch or Interfacepermits selection of
appropriate Sensor response curve when
more than one curve isstored (see
Precision Option).
DISPLAY READOUT:
Display: 4-digit LED Display of Sensor
reading in
Sensor Units (Voltsor Ohms) or
temperature
in K, °C, or °F shown with
annunciators.
DisplayResolution: 0.1K above
100K, 0.01K
below 100K, or 1
mV (0.1 ohm with resis-
tance option)
Temperature Accuracy: Dependent on
Sensor Input and Sensor. See Input
Options available.
Temperature Range: Dependent on Sensor
Input Module and Sensor.

Table 1-2. Specifications, Model 805 - Continued
TEMPERATURE CONTROL:
Set Point: Digital thumbwheel selection in
kelvin, celsius, fahrenheit, or volts (ohms
with resistance option).
Set Point Resolution: Same unitsand
resolution as display.
Controllability: Typically better than 0.1K in
a properly designed system.
Control Modes: Proportional(gain) and
integral (reset) set via front-panel or with
optional computer interface.
Heater output: Up to25 watts (1A,25V)
available. Three output ranges canbe
selectedeither from
optional computer interfaceand provide ap-
proximatedecade stepreductions of maximum
power output. Optional 60 watt, 1.5 ampere
25 ohm output (Option W60) is available for
the 805.
Heater output Monitor: LED display
continuously shows heater output as a
percentageof output range with a resolution
of
1%.
Control Sensor: EitherSensor Input
(selected from rear panel).
GENERAL:
Sensor Voltage/Monitor: Bufferedoutput of
each diode sensor voltagefor standard
configuration. For -6 optionmodule,
voltage output times 0.5. For positive
temperaturecoefficient modules (-P2, -P3,-
R1), buffer issensor voltageoutput times-
10.
Response time (electronics): Displayupdate
cycle time of less than1second(650msec
typical).
2 seconds (3 readings) on channel
change or step change.
IEEE-488 Interfaceoption: Allows remote
control of setpoint, gain, reset, units,
displaysensor and heater power range
(except power on/off). Provides output of
display, displayunitsand allfront panel
functions.
RS-232C Interfaceoption: Controls same
parameters as IEEE-488 Interface.
Dimensions, Weight: 216mm wide x 102mm
high
x 381mmdeep (8.5 in. x 4in. x 15 in.),
5.5 kilograms (12 pounds).
Power: 100, 120, 220 or 240 VAC (selected
via rear panel with instrument off), 50 or
60
Hz, 75 watts.
Accessories Supplied: Matingconnector for
sensor/monitor connector, operations
manual.
1-5

This PageIntentionally Left Blank

SECTION II
INSTALLATION
2.1 INTRODUCTION
This Section contains informationand
in-
structionspertaining to instrument set-up.
Includedare inspectionprocedures, power
and grounding requirements, environmental
information, bench andrackmountingin-
structions, a descriptionof interface con-
nectors, and repackaging instructions.
2.2 INITIAL INSPECTION
This instrument was electrically, mechan-
icallyand functionally inspectedprior to
shipment.
It shouldbe free frommechanical
damage, and
in perfect working order upon
receipt. To confirm this, the instrument
shouldbe visually inspectedfor damage and
tested electrically todetect any concealed
damage upon receipt. Besure toinventory
allcomponents supplied before discarding
any shipping materials.
If there isdamage
to the instrument
in transit, be sure to file
appropriate claims promptly with the carrier,
and/or insurancecompany. Pleaseadvise
LakeShore Cryotronics, Inc. of such filings.
Incaseof parts shortages, adviseLSCI
immediately.
LSCI cannot be responsible
for any missingparts unless notifiedwithin
60 days of shipment. The standard Lake
Shore Cryotronics Warranty isgiven
on the
first page
of this manual.
2.3 PREPARATION FOR USE
2.3.1 Power Requirements
The Model
805 requiresa power source of
50 to 60 Hz single phase 100, 120, 220 or
240 VAC (+5%, -10%).
CAUTION
Verify that the AC Line Voltage
Selection Wheel (Figure 3-2, Key 1
located on the rear panel of the
Model 805 is set to the AC voltage
to be used (Table 2-1) and that the
proper fuse is installed before
inserting the power cord and turning
on the instrument.
2.3.2 Power Cord
A three-prong detachable power cord for
120 VAC operation which mates with the
rear panel
UL/IEC/ICEE Standard plug is
included with the instrument.
2.3.3 Grounding Requirements
To protect operating personnel, the National
Electrical Manufacturer's Association
(NEMA) recommends, and some local codes
require, instrumentpanels and cabinets to
be grounded. This instrument
is equipped
with a three-conductor power cable which,
when plugged intoan appropriate recep-
tacle, grounds the instrument.
Table 2-1. Line Voltage Selection
Line Voltage (Volts)
100
120
220
240
Operating Range (Volts)
90-105
108-126
198-231
216-252
Fuse (A)
1 - SB
1 - SB
0.5- SB
0.5- SB
2-1

Figure 2-1, Typical Rack Configuration
2.3.4 Bench Use
The 805 isshipped with feet and a tilt stand
installed and isreadyforuseasabench
instrument. The front of the instrument
may be elevatedfor convenienceof opera-
tionand viewing
by extending the tilt stand.
2.3.5 Rack Mounting
The 805 can be installed in a standard 19
inch instrument rack by using theoptional
RM-3H1 or RM-3H2 rack mounting kit.
A
typical RM-3H1 rack kit installations with
handles is shown
in Figure 2-1.
2.3-6 Sensor Input Connections
TheModel805 issuppliedwith a 24pin
rear panel mountedD-style connector for
the connection of two sensors. Thecon-
nection definitionfor the sensor(s) isgiven
in Table 2-2 and isshown in Figure2-2.
Table 2-2. Connector Plug Connections
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Function
+V A Input
-V A Input
SHIELD (A Input)
+V B Input
-V B Input
+V Buffered Sensor
-V Output Signal(A)
+V Buffered Sensor -
-V Output Signal(B)
Pin
#
13
14
15
16
17
18
19
20
21
22
23
24
Function
+I A Input
-I A Input
SHIELD (B Input)
+I B Input
-I B Input
+V Option 8055
-V Analog
Output
+5 VDC (10 mA LIMITED)
DIGITAL GROUND
2-2

Figure 2-2, Sensor Connections
The use of a four wire connection (Figure 2-
2a) ishighly recommended
for resistive
elements
toavoid introducing IR drops in
the voltage sensing pair which translates
intoa temperature
measurement error.
An alternate two linewiring method (Ter-
minals
A and E shorted together, B and D
shorted) may be used forthe DT-470 and
TG-120 series
diodes in less critical applica-
tions where lead resistance issmall and
small readout errors can betolerated(b).
Measurement errors due to lead resistance
for a two leaddiodehook-upcan be
calcu-
latedusing; T = IR/[dV/dT] where I is10
microamperes,
R isthe total lead resistance;
dV/dT isthediode sensitivity
and T isthe
measurement error. For example,
R = 250
ohms with dV/dT = 2.5 millivolts/kelvin
results
in atemperature error of 1 kelvin.
Two wire connections are not recommended
for other sensor types.
The Lake Shore Cryotronics, Inc.
QL-36
QUAD-LEAD™ 36 gauge cryogenic wire is
ideal for connections tothe sensor since the
four leads are
run together and colorcoded.
The wire isphosphor Bronze with a formvar
insulationand butryral bonding between the
four leads.
2.3.7 Sensor Output Monitors
Buffered
voltage outputs of both SensorA
and Sensor
6 areavailablefrom the same
connector on the back of the instrument.
This connector also carriestheModel
8055
Analog Output Option when present. The
connector
pin definitions are given in
Table 2-2.
2.3.8 SENSOR ID Switches
The
SENSOR A ID and SENSOR B ID
switches are used toselect stored sensor
curves and toactivateor deactivatedigital
filtering. The
SENSOR ID switch informa-
tion isdescribed
in Table 2-3 and
Figure 2-3.
Figure
2-3. SENSOR ID Definitions
Switch
1
2
3
4
5
6
7
8
setting Description
OPEN -NegativeT. C.
CLOSED - Positive T. C.
OPEN -Continuous Update
CLOSED - DigitaI. Filtering On
OPEN -ThermalConsidered
CLOSED-NoThermalConsidered
OPEN -CurveSelection
CLOSED - Position selection
Multiple Bit 3
Multiple Bit 2
Multiple Bit 1
Multiple Bit o
Table 2-3 gives the positionof the address
switches tocall up standard curves stored
within the instrument. Informationon Pre-
2-3

cisionOption Curves isgiven in Appendix B.
Curve #2 and Curve #4 differ in that Curve
#2 has an upper temperature limitof 325K
which limits the set pointbetueen 0and
325K while Curve #4has anupper limit of
475K and a correspondingupper
limit for the
set point.
Table 2-3. SENSOR ID Curve Address
SENSOR ID Switch
5678
0000
0001
0010
0011
0100
Curve # Description
I
00
01
02
03
04
DRC-D
DRC-E1
CRV 10
DIN-PT
CRV 10
See SECTION III and Appendix B for more
information on sensor selectionand the
operationof theSENSOR IDswitches.
2.3.9
Heater Power
The heater output leads shouldbe electri-
cally isolatedfromthe sensor(s) ground(s) to
precludethe possibility of any of the heater
current affecting the sensor
input signal.
The heater leads shouldnot runcoincident
with the sensor leadsdue tothe possibility
of capacitive pick-upbetueen the twosets
of leads. If they are incloseproximity,
they shouldbe wound so as tocross the
sensor leads at ninetydegrees
if at allpos-
sible.
The heater output isa current drive and
does not have to be fused. The 805 is
designed towork with a
25 ohmheater for
maximumheater output
(25 watts). Ifa
smaller resistance isused, themaximum
heater power correspondstothe heater
resistance, i.e., 10ohmsyields
10 watts. A
largerheater resistance can also beused
with the805. For example, since the com-
pliance voltage isslightlyabove
25 volts; a
50 ohmheater would result ina maximum
power output of
12.5 watts [(25) /50].
Anoptional (W60) output power stage of 60
watts isavailable for the805. This output
2
2-4
is
also set up for a 25 ohm loadwith a
maximum current of 1.5 amperes at approxi-
mately 43 volts.
Lake Shore recommends a 30 gauge stranded
copper leadwire
(Model ND-30) for use as
lead wires to the heater.
2-4 OPTIONS
2.4.1 Model 8053
RS-232C INTERFACE Op-
tion. The RS-232C option isdescribedin
Section
VI of this manual.
2.4.2 Model 8054 IEEE-488 INTERFACE
Option. The IEEE option isdescribedin
Section
VI of this manual.
2.4.3 Model8055 Linear Analog
Output
Option. The Linear Analog Option isdes-
cribed
in Appendix C of this Manual.
2.5 ENVIRONMENTAL REQUIREMENTS
WARNING
To prevent electrical fire or shock
hazards, do not expose the instrument
to excess moisture.
2.5.1 Operating Temperature
Inorder tomeet and maintain the speci-
fications inTable
1-1, the 805 should be
operated at an ambient temperature range
of 23°C±5°C. The unit may beoperated
within the range of 15-35°C with less ac-
curacy.
2.5.2 Humidity/Altitude
The 805 isfor laboratory
use. Relative
humidity and altitudespecifications have
not been determined for this unit.
2.6 REPACKAGING
FOR SHIPMENT
If the Model 805 appears tobe operating
incorrectly, refer tothe Technical Service
Guide.
If these tests indicatethat there is
a fault with the instrument, please contact
LSCI or a factory representative for a
returnedGoods Authorization
(RGA) number

before returning the instrument to our ser-
vice department.
When returning an instrument for service,
photocopy and complete theservice Form
foundat the back ofthis manual. The form
should include:
1. ReturnedGoods Authorization No.
2. InstrumentModel and Serial Numbers
3. User's Name, Company, Address, and
4. Malfunction Symptoms
5. Descriptionof Measurement system
If the original carton isavailable, repack the
instrument
in a plastic bag, place it in the
cartonusingoriginal spacers toprotect
protrudingcontrols. Seal the cartonwith
strong paper or nylon tape. Affixshipping
labels and "FRAGILE" warnings.
If the original carton is not available, pack
the instrument similar tothe above proced-
ure, being
carefut tousespacers or suitable
packingmaterial on
all sides ofthe instru-
ment.
Phone Number
2-5

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SECTION III
OPERATING INSTRUCTIONS
3.1 INTRODUCTION
This section contains information and in-
structions concerning theoperation of the
Model 805 Temperature Controller. Included
isa description of the front and rear panel
controls and indicators.
3.2 INSTRUMENT CONFIGURATION
3.2.1 Input Modules
The Model 805 can be used with several
different
input modules. Thesemodules are
summarized
in Section I. Input modules can
be mixed, allowing two different sensor
types tobe used with the 805, e.g., both a
diode thermometer and a resistance
ther-
mometer could be used on the two inputs,
with the addition of one optional
input mod-
ule.
3.3 PRECISION OPTIONS
There are two types of Precision Options
available for the 805. The 8001 Precision
Option issupplied for calibratedsensor(s)
precisionoptiondata ordered
at the same
time as the 805.
The8002 Precision Option isused when the
customer already owns an805 and wants new
sensor calibrationdata stored inthe instru-
ment.
LSCI stores the calibrationdata ina
PROM chip and sends the programmedchip
to the customer. The
PROM isthen in-
stalled
in the 805 by thecustomer. Note:
When orderingthe8002 Precision
Option,
specify the serialnumber of the805.
Note that additional calibrations can be
added to
the instrument at a later timeby
specifying with the sensor calibrationat
time of order, the serial number of the
instrument.
If a PrecisionOption isordered from the
factory, itscurve number
will bespecified
for the
user and included inthemanual as
anaddenda
to the manual (see Appendix B).
Note: A proprietary algorithm is used to
fit the precisionoptiondata towithin a
few millikelvinover the entire temperature
range.
3.4 CONTROL FUNDAMENTALS
An application note entitled “Fundamentals
for Usage of Cryogenic Temperature Con-
trollers” isincludedas an appendix inthis
manual and should be read indetail
if you
are not familiar with cryogenic temperature
controllers.
3.5 CONTROLS AND INDICATORS
Figures 3-1 and 3-2 identify the805 dis-
plays, annunciators, controls, and connect-
ors. The identificationof each item is
keyed in the appropriate figure.
FRONT PANEL DESCRIPTION
3.6 POWER ON/OFF
Switch
Before connecting AC power tothe805,
make sure the rear panel voltage selector is
set tocorrespond totheavailable power
linevoltage. Be certainthe correct fuse is
installed
in the instrument.
3.6.1 POWER UP SEQUENCE
Immediately on POWERONthe805 runs
through a power upsequence as follows:
1. The Display indicates ±8.8.8.8 and the
Heater
% indicates 188. Inadditionall
annunciators and LED's are turned on.
The LED's include:
SENSOR A and B,
CONTROL SENSOR A and Bas well as
four sets of units;
HEATERPOWER (LO,
MED, HI);+ and -; 2 decimal points for
set point and
if a resistance module is
present, an ohms indicator; and with an
optional computer interface, the
LOCAL/REMOTE indicators.
3-1

2. Next, the unit displays 805 in the dis-
playwindow and,
if present, indicates
the IEEE-488 interfaceaddress
in the
HEATER % window. This address can
be changed
by the user and verifica-
tion isalways given on power-up.
Note that any changes
in the IEEE-488
address are
only recognized and read
by the instrument on power-up.
3. The unit then displays for
INPUT A
the module associatedwith that input
inthe display window as well as the
SENSOR A ID curvenumber in the
HEATER % window.
4. The unit then displays the same in-
formation for Input
6.
5. The unit then goes intonormal opera-
tion.
3.7 DISPLAY SENSOR Block
3.7.1 DISPLAY SENSOR Input
The choice of Display SENSOR
input ismade
by pushbuttons on the front panel which
allows the user todisplayeither input and
indicateby an annunciator the sensor input
which is currently displayed.
3.7.2 Units Select
The
UNITS key isused to change the display
and control units. The key is locatedbelow
the lower right corner of
the display win-
dow. Pressing the key scrolls the units, i.e.,
K °F V °C Ketc. The selected units
are displayed tothe right of the HEATER %
power display. The unitsdisplay light is
blinked to indicate the frequencyof display
update.
The temperatureunits for both inputs are
selected by theunits buttonandarekept
the same to avoid confusion.
3.7.3 Display SENSOR Units
3.7.3.1 Voltage Units
Inthe voltage mode, the display has a reso-
lutionof 1 millivolt and a
full scale input of
3.000 volts (6.553 volts for the -6module).
3-2
If an input exceeding 3.000 volts (or 6.553
volts for the -6module) isappliedtothe
displayed
input, an overloadcondition is
present and is indicatedbyanOL on the
display.
3.7.3.2 Resistance Units
The Resistancemode requiresthe -P2,
-P3,
or -R1 input conversion module(s).
The display ranges and resolutions for the
-P2, -P3 and -R1 are
0.0 to 299.9 ohms,
0 to 2999 and 0.0 to 100.0 ohms respective-
ly. If a resistance exceeding full scale is
applied to
the input, OL isindicated on
the display.
3.7.3.3 Temperature Units
In kelvintemperature units, the chosen
input isdisplayed with a display resolution
of 0.1 degree above 100 kelvinand0.01
degree between 1
and100 kelvin. Note
that thisis
display resolutionand notsys-
tern resolutionor
accuracy of the reading.
If the sensitivity of thesensor istoo low
tosupport this resolution, i.e., onebit
correspondsto greater
thanthe above
resolution, some temperatures may
be skip-
ped. This
will betrue for a silicondiode
sensor between
30 kelvin and 100 kelvin
where the sensitivity isapproximately
2.5
millivolts per kelvinand the voltage resolu-
tion is0.046
millivolts. For this case, the
resulting temperature resolutionis0.046/2.5
= 0.018 kelvin. However, below30 kelvin
the silicondiode sensitivity isapproximately
25
millivolts per kelvinwhich results inan
approximate resolutionof 0.002 kelvin
(0.046/25).
For the Celsius and fahrenheit scales, reso-
lutionis
0.01 degree within 100 degrees of
their respective zeros and0.1degree out-
side this band for either positive or nega-
tive temperatures.
3.7.4 Filtering the Display
An averaging algorithmwithin the instru-
ment isavailablewhich averages up toten
readings. This readingmode eliminates
noise within the cryogenic system analogous
toaveraging within
a digital voltmeter.