Lake Shore 520 Bedienungsanleitung

User’s

Manual

Cryogenic Temperature

Indicator/Controller

Model

520

ObsoleteNotice:

This manual describes an obsolete Lake Shore product. This manual is a copy from our

archives and may not exactlymatchyour instrument.Lake Shore assumesno responsibilityfor

this manual matching your exact hardware revision or operationalprocedures. Lake Shore is

not responsiblefor any repairs made to the instrumentbased on informationfrom this manual.

LakeShoreCryotronics,Inc.

575

McCorkleBlvd.

Westerville, Ohio

43082-8888

USA

E-MailAddresses:

[email protected]

Visit OurWebsite:

www.lakeshore.com

Fax:

(614)891-1392

Telephone:

(614)891-2243

Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc.

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

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

connectionwith furnishing, performance, or use of this material.

ObsoleteManual

October

1983

Table of Contents

Section Page

General Information

1.1

Introduction

1.2

Description and Applications

1.3

General Specifications

1.4

Major Assemblies Supplied

1.5

Options and Accessories Available

1.6 Temperature Sensors

1.7 Repacking for Shipment 5

11.

Introduction

2.1 Introduction

2.2 Initial Inspection 7

2.3 Power Requirements 7

2.4

Grounding Requirements

2.4.1

Instrument Grounding

2.4.2

Temperature Sensor Grounding

2.5 Instrument Installation

2.5.1 Bench

Use

2.5.2 Rack Mounting

2.6 Sensor and

Heater

Connections

2.6.1 Sensor Input Connections

2.6.2

Heater

Connections

111.

Operating Instructions

3.1

Introduction

3.2 Controls, Indicators and Connectors

3.3

Initial Checks 15

3.4 Temperature Readout Mode

3.5 Constant Temperature Control Mode

3.6

MAN

and

MIX

Control Mode 17

3.7 Remote Parallel

BCD

Input/Output Option

3.8

Grounding

IV.

Theory of Operation

4.1

Introduction 21

4.2

General Description 21

4.3

Detailed Description

-ii-

Table

Contents, cont'd.

Section Page

Maintenance and Calibration

5.1 Introduction 27

5.2 General Maintenance 27

5.3

Access

Information 27

5.3.1 Fuse Replacement 27

5.3.2 Model 5201

BCD

Option Installation 28

5.4 Operational Checks 28

5.5 Calibration 29

5.5.1 Current Sources 29

5.5.2 Set Point

5.5.3 Diode Input Buffer 30

5.5.4 Resistor Input Amplifier 30

5.5.5

Current Summing

5.6 Troubleshooting

5.7 Replaceable Parts 32

5.7.1

How

to Obtain Parts

-a-

Table

Illustrations

Reference

Des

ion Page

Figure

1.1

Model 520 Cryogenic Temperature vi

Controller

Figure 2.1 Model 520 Sensor Connection to 9

Table

2.1

Sensor Connections 9

Figure 2.2 Typical RM-3F and RM-5F Rack 10

Instrument

Mounting Installation

Controller Front Panel

Figure

3.1

Model 520 Cryogenic Temperature 14

Table

3.1

Functional Description of the 520

Front Panel and

Rear

Panel Features

Figure 3.2 Model 520 Cryogenic Temperature 14

Controller

Rear

Panel

Table 3.2

Parallel

BCD

Output

Sensor 20

Voltage/Input of Set Point

Figure

3.3

Temperature Versus

Time

Characteristics 19

of Controller

Table 4.1 Translation

Null Error Versus Set 25

Point Deviation

Figure 5.1 Component Layout

Main

PCB

Table 5.1 Troubleshooting Guide for Model 520 34

Figure 5.2 Schematic

Main

Schematics 43

Figure 5.3 Schematic

Output Section 45

Table 5.3 Parts

List

A2 Front Panel Assembly 49

Figure 5.4 Schematic

Power Supply 47

Figure 5.5 Component Layout

Model 5201

BCD

Table 5.2 Parts

List

Main

PCB

Assembly 36

Table 5.4 Parts

List

Rear

Panel Assembly 50

Option

PCB

Table 5.5 Parts

List

A4 Transfer Assembly

Figure 3.6 Schematic Model 5201

BCD

Option 59

Table 5.6 Parts

List

Heater

Current

Heat

Sink Assembly

-iv-

Table

Illustrations, cont'd.

Reference Description Page

Table 5.7 Parts List

SA11

Heater Current 52

Range Assembly

Table 5.8 Parts List

A7 Final Assembly 53

Table 5.9 Parts List Model

5201

BCD Option

PCB Assembly

Manufacturers

Table 5.10 Cross Reference

Parts 61

-V-

Figure 1.1 Model 520 Cryogenic Temperature Controller

-vi-

SECTION

General Information

1.1

Introduc

ion

This section contains a description of the Model

520

Thermo-

meter/Controller, its applications, general specifications, major

assemblies supplied and accessory equipment available.

1.2

Description and Applications

The Model

520

Cryogenic Temperature Thermometer/Controller is

housed in an aluminum case and is rack mountable with the

RM-5H

rack

mount kit in a standard

19"

relay panel.

All

connections are at the

rear

the case with

all

normal operating controls on the front panel.

The instrument is line operated from either

115

volt or

230

volt mains,

Hertz.

The controller has the performance features needed for use with

silicon or gallium-arsenide diodes, germanium, carbon-glass, platinum,

or other resistance thermometers,

any

sensor with a voltage response

less than four volts or a resistance of less than

40,000

ohms. The

520

is designed to accept a voltage signal or resistance equivalent signal

from a temperature sensitive transducer, compare this signal with an internal

set point voltage or resistance equivalent voltage, amplify and process

their difference (error signal), and drive an external heating element.

Sensor currents from

microampere to

milliamperes can be

selected from the front panel. Use of analog control means constant

and immediate correction for temperature changes. Ample range of gain,

reset, and rate have been designed into the

520

to assure fast response,

low offset error, and high stability.

The Gain control

the Model

520

has

and

steps similar

those for the current supply. As a result, loop gain

the system can

be kept constant even when sensor current must be changed

avoid sensor

self-heating or because of low signal value.

heater output current of up

one ampere is available

drive up to a

ohm load. Smaller load resistances will reduce the

maximum power below

watts as will higher resistance loads due to the

voltage limiting of the power supply of the output stage. The maximum

heater current may

set from

to 1

ampere

and

steps

which enables output power to be varied in decade steps over five orders

magnitude.

-1-

Manual control of the heater output current

available from

the front panel. Additionally, the user can manually add

fixed

current to the controlled current. This manual offset often produces

improved control in relatively stable systems and applications since

all

the heater power

not contributed

via

Controller gain.

The 520 can be used to accurately measure temperature by being

operated in the open loop mode. The sensor

nulled against the

set-

point using the built-in

meter,

thus the set-point becomes

read-out

of the actual sensor signal, either voltage or resistance. Referral to

the V(T) or R(T) calibration table for the particular sensor yields the

actual temperature reading.

In the resistance mode, the

set

point

directly in ohms, thus

the user

freed from constant use of Ohms

Law

to read or control tempera-

tures. In the diode mode, the set-point

calibrated in volts since

most diode temperature calibrations

are

provided

voltage

function

of temperature

constant current.

Multi-sensor inputs for the Model 520

are

possible with the

accessory Model SW-10A Sensor Selector.

sensors can be

connected to the 520.

the

SW-10A.

Selection

made

via

front-panel pushbuttons on

1.3

General Specifications

The following specifications for the Model 520 Cryogenic Tempera-

ture Thermometer/Controller are applicable when used with cryogenic

thermometers.

Input:

Temperature Range:

1.4

380K

with Lake Shore DT-500 Series Sensors;

volts for other diode sensors; 0-40 ohms to 0-40K ohms for

resistance sensors

ranges, selected by Sensor Current selector).

Recommended Sensors: DT-500 Series silicon or TG-100 Series gallium-

arsenide diode sensors;

CGR-1

carbon-glass, GR-200 germanium, or PT-100

platinum resistance sensors. (Order sensors separately.) Calibration

required over appropriate temperature range to provide V(T) or R(T)

data. Resistors with either positive or negative temperature coefficients

can be utilized.

Sensor Input: Separate diode and resistor inputs. 4-terminal input for

each type. Can be connected in 2-wire configuration.

Sensor Excitation:

10,

30,

100,

300,

1000,

and 3000 microamperes

(resistors) or

10,

100,

and 1000 microamperes (diodes) selected

from the front panel.

-2-

Temperature Control:

Set

Point: Selected via 5 front-panel digital thumbwheel switches

from

00000

to 39999. Decimal point

automatically positioned

de-

pending on sensor type and sensor current selected to indicate

0.0000

to 3.9999 volts,

00.000

to 39.999 ohms,

000.00

to 399.99 ohms,

0000.0

to 3999.9 ohms, or

00000

to 39999 ohms. Optional

BCD

control with

Interface.

Typical Controllability:

0.0005K for temperatures below 30K,

0.005K

higher temperatures with silicon diodes in

properly

designed system.

Control Modes: Automatic: Proportional (gain), integral (reset), and

derivative

(rate)

set

from front-panel controls. Manual:

100%

of full output can be

set

from front-panel. Manual and Automatic modes

can be used simultaneously.

Heater

Output: 0-25

watts

into 25 ohm load or

0-10

watts

into

ohm

load (rear-panel switch-selected).

Heater

current can be limited at

10mA,

30mA,

100mA,

300mA, and

(approximate decade power increments).

Temperature Readout:

Method: Sensor voltage

nulled against set-point equivalent voltage

using front-panel thumbwheels in MANual mode. Temperature

deter-

mined from V(T) or R(T) tables (requires sensor calibrated over approp-

riate

temperature range).

Accuracy:

100

microvolts

calibration error of Sensor.

Gener

Dimensions, Weight: 432mm wide x 146mm high x 330mm deep (17 in.

5-3/4 in. x

in.). Style

full-rack package.

Net

weight

(18

lbs.).

Power: 105-125 or 210-250

VAC

(switch selected), 50 or 60

Hz,

watts.

1.4 Major Assemblies Supplied

The Model 520 Cryogenic Temperature Thermometer/Controller

includes

standard equipment, in addition to the controller proper,

the following additional components:

One 14-pin

male

connector (LSCI Stock #106-070)

and 12 pins

required) (LSCI Stock #106-060).

Assembly

mates

with

connector on Model 520

Rear

Panel.

One Operating and Service Manual

-3-

1.5 Options and Accessories Available

Model 5201 Interface. Allows remote digital control of set-point

and provides

BCD

output of Sensor voltage divided by two.

Model SW-10A. 10-Sensor Selector Switch. Pushbutton selection of

any one of up to

sensors. Dimensions: 216m wide

102mm high

330mm

deep

(8%

in.

13 in.). Style

half-rack package.

Model

RM-3H.

Rack mount kit to mount either one or two

SW-10A

standard

3½

in. rack space.

Model RH-5F. Rack

ears

with handles

mount Model 520 in standard

5¼

in. rack space.

1.6

Temperature Sensors

Model DT-500 Silicon Diode Sensors. (Refer to Lake Shore Series

UT-500 Technical

Data

for details.)

DT-500K

DT-500P

-GR

DT-500KL DT-500FP

DT-500K-TO5 DT-500P-GR Mini

DT-500KL-TO5 DT-500FP-HRC-6

-5

0P DT-500FP-HRC-

DT-500CU-36 DT-50

ODRC

DT-500-CU-DRC-36

Model TG-100

GaAs

Sensors. (Refer to Lake Shore TG-100 Technical

Data for details.)

TG-100P

TG-

00FP

Model

CGR-1

Carbon

Glass

Resistor Sensors. (Refer to Lake Shore

CGR-1

Technical

Data

for details.)

CGR-1-500 CGR-1-2000

CGR-1-1000 CGR-1-3000

CGR-1-1500

Model GR-200 Germanium Resistor Sensors. (Refer to Lake Shore

GR-200 Technical

Data

for details.)

GR-200A-30,50,100,250,500

GR-200A-1000,1500,2500,5000

GR-200B-500,1000,1500,2500,5000

-4-

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