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Guildline 6636, Operator'S Manual

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Guildline 6636 Operator'S Manual Download Page 21

 

 

5.  PRINCIPLES OF OPERATION 

5.1.

 

INTRODUCTION 

The heater control unit in the model 6636 enclosure consists of the following functional blocks. 

a)  Temperature Control - 

consisting  of  a  sensor,  oscillator,  amplifier,  detector  and 
heater. 

b)  Over temperature Circuit 

c)  Power Supply 

Figure 5-1:  HEATER CONTROL UNIT 

 

OSCILLATOR 

AMPLIFIER/ 
DETECTOR 

HEATER 

DRIVER 

POWER 

SUPPLY 

AC   IN 

HTR 

CONTROL 

O/T 

SWITCH 

Summary of Contents for 6636

Page 1: ...to Guildline Instruments Limited They are to be used only as a guide to the operation and maintenance of the equipment with which this manual was issued and may not be duplicated or transmitted by an...

Page 2: ......

Page 3: ...line cord supplied or a proper line cord specified for the country of use Operating this instrument without a proper grounded line connection can result in electrical shock hazard 4 Observe all conne...

Page 4: ......

Page 5: ...ine Input Connector 1 3 1 4 2 Resistor Terminals 1 3 1 4 3 Guard Terminal 1 3 1 4 4 Chassis Ground Terminal 1 3 2 SPECIFICATIONS 2 1 2 1 GENERAL SPECIFICATIONS 2 1 2 2 RESISTANCE SPECIFICATION 2 2 3 O...

Page 6: ...iminary Checks 4 1 4 3 2 Temperature Control 4 2 4 3 3 Over Temperature 4 4 5 PRINCIPLES OF OPERATION 5 1 5 1 INTRODUCTION 5 1 5 2 TEMPERATURE SENSITIVE OSCILLATOR 5 2 5 3 AMPLIFIER AND DETECTOR 5 2 5...

Page 7: ...OF FIGURES FIGURE 1 1 FRONT VIEW 1 2 FIGURE 1 2 REAR VIEW 1 3 FIGURE 5 1 HEATER CONTROL UNIT 5 1 FIGURE 5 2 TEMPERATURE SENSITIVE OSCILLATOR 5 2 FIGURE 5 3 AMPLIFIER AND DETECTOR 5 2 FIGURE 5 4 HEATER...

Page 8: ...OM6636 B 00 12 February 2015 iv LIST OF TABLES TABLE 2 1 GENERAL SPECIFICATIONS 2 1 TABLE 2 2 RESISTANCE SPECIFICATION 2 2 TABLE 4 1 CONTROL CIRCUIT BOARD TESTING 4 2 TABLE 4 2 TRANSISTOR VOLTAGES 4 4...

Page 9: ...l shock and vibration in commercial carrier shipment To protect the standard resistors from overheating due to a malfunction of the temperature control there is an overriding over temperature control...

Page 10: ...excess of the operating temperature or in the event of control failure 1 3 4 PRT The platinum resistance thermometer imbedded within the temperature controlled chamber is configured as a four termina...

Page 11: ...esistor Terminals There are a set of two terminal input outputs for each installed resistance element Each set consists of two type N connectors labelled with the nominal value of each of the standard...

Page 12: ...Section 1 OM6636 B 00 12 February 2015 1 4...

Page 13: ...resistors 28 0 003 C 82 4 0 005 F Temperature Stability 1 year exclusive of the self heating effects of the resistors 28 0 01 C 82 4 0 02 F Cold Power on Stabilization Time to Specified Accuracy 36 ho...

Page 14: ...0 10 T 3500 3000 750 25 1000 100 T 6000 5000 1000 35 1000 Table 2 2 Resistance Specification Notes 1 Nominal initial tolerance is defined as the maximum variation of resistance mean values as initiall...

Page 15: ...on the rear panel as shown in Figure 3 1 Place the instrument on a vibration free bench or install it in an equipment rack as required Connect the line cord to the appropriate line power outlet and sw...

Page 16: ...the following equation C R R t t 392 0 0 Where R0 is the previously measured resistance value 3 2 3 Power Entry Selection Check to see that the fuses inserted in the receptacle correspond to the corr...

Page 17: ...r if the resistors temperature stabilized enclosure has been allowed to cool the resistors should be allowed to stabilize at the operating temperature for at least 36 hours before measurement or befor...

Page 18: ...rcuit If the indicator lights then check the resistance of Rl and the thermistor pair RT1 RT2 Rl should be 3 k to 5 k RT1 RT2 is equal to Rl at 30 C and is larger than R1 if the temperature is less th...

Page 19: ...4 T101 C102 R103 R125 R104 R110 TP1 If oscillation is observed then check between TP2 collector Q103 and Pl 7 The waveform should be as shown If not then check the following components Q103 C106 R117...

Page 20: ...mperature sensitive switch S2 is open If these conditions are satisfied then replace fuse F1 and check that the HEATER indicator is lit Monitor the increase in temperature with the PRT If the lamp doe...

Page 21: ...re consists of the following functional blocks a Temperature Control consisting of a sensor oscillator amplifier detector and heater b Over temperature Circuit c Power Supply Figure 5 1 HEATER CONTROL...

Page 22: ...utput to the base of Q101 increases As soon as this voltage exceeds half the transformer output the circuit gain becomes greater than one and oscillation occurs 5 3 AMPLIFIER AND DETECTOR Figure 5 3 A...

Page 23: ...ols the heater current The resistors R119 R121 and R122 ensure that Q1 is not conducting when there is no output from the oscillator 5 5 OVERTEMPERATURE CIRCUIT If the temperature in the enclosure exc...

Page 24: ...of the instrument from 100 120 VAC or 220 240 VAC 50 or 60 Hz and feeds a full wave rectifier The heater is fed from the unregulated output and the control circuit is fed from a regulator consisting...

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