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Guildline 6636 Operator's Manual

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OPERATORS MANUAL
FOR
MODEL 6636
RESISTANCE STANDARD
NOTICE
The contents and information contained in this manual are proprietary 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 any means, either in
whole or in part, without the written permission of Guildline Instruments
Limited.
OM6636-B-00
12 February 2015

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Summary of Contents for Guildline 6636

  • Page 1 NOTICE The contents and information contained in this manual are proprietary 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 any means, either in whole or in part, without the written permission of Guildline Instruments Limited.
  • Page 3 HAZARDS WARNING! TEMPERATURE STABILIZED RESISTANCE STANDARD INSTRUMENTS READ THESE SAFETY PRECAUTIONS BEFORE SETTING UP OR USING THIS INSTRUMENT! IMPROPER SETUP OR OPERATION OF THIS INSTRUMENT CAN RESULT IN PERSONAL INJURY, BURNS OR ELECTRICAL SHOCK! Precautions, Safety and Preparation for Use 1.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ....................1-1 1.1. SCOPE ..............................1-1 1.2. GENERAL DESCRIPTION ........................ 1-1 1.2.1. Resistance Ranges ..........................1-1 1.2.2. Non-Standard Model Configurations ....................1-1 1.3. FRONT PANEL INDICATORS AND CONTROLS ................. 1-2 1.3.1. Power ..............................1-2 1.3.2. Heater ..............................1-2 1.3.3. Over Temperature ..........................1-2 1.3.4.
  • Page 6 4.3. CORRECTIVE MAINTENANCE ...................... 4-1 4.3.1. Preliminary Checks ..........................4-1 4.3.2. Temperature Control ...........................4-2 4.3.3. Over Temperature ..........................4-4 PRINCIPLES OF OPERATION ................5-1 5.1. INTRODUCTION ..........................5-1 5.2. TEMPERATURE SENSITIVE OSCILLATOR ................5-2 5.3. AMPLIFIER AND DETECTOR......................5-2 5.4. HEATER DRIVER ..........................5-3 5.5.
  • Page 7 TABLE 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 DRIVER ..........................5-3 FIGURE 5-5: POWER SUPPLY ..........................5-4 OM6636-B-00 12 February 2015...
  • Page 8 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 OM6636-B-00 12 February 2015...

  • Page 9: Introduction

    34 °C 3 C. The model 6636 is intended to be used as Primary Resistance Standards, or Working Resistance Reference Standards. The 6634A is particularly useful for an Automated High Resistance Measurement System.

  • Page 10: Front Panel Indicators And Controls

    Section 1 Figure 1-1: Front View 1.3. FRONT PANEL INDICATORS AND CONTROLS The front panel indicators and controls are illustrated in Figure 1-1. They are provided to indicate power status, heater operation and temperature status. 1.3.1. Power The POWER indicator is lit when the AC power is applied to the unit and the power ON/OFF switch on the rear panel is “ON”.

  • Page 11: Rear Panel Connectors And Controls

    1.4.4. Chassis Ground Terminal The CHASSIS GND terminal consists of a four way green binding post. The CHASSIS GND terminal is bonded to the chassis of the model 6636 and to the power ground of the line input connector. OM6636-B-00...
  • Page 12 Section 1 OM6636-B-00 12 February 2015...

  • Page 13: Specifications

    Section 2 SPECIFICATIONS 2.1. GENERAL SPECIFICATIONS MODEL 6636 RESISTANCE STANDARD General Specifications Operating Temperature °C °F Storage Temperature -20 to +60 °C -4 to +140 °F Operating Humidity (non-condensing) < 50 % RH Storage Humidity (non-condensing) < 90 % RH Temperature Stability (24 hours) °C...

  • Page 14: Resistance Specification

    Metrology Institute, and expressed as a total uncertainty with a coverage factor of k = 2. A traceable ISO/IEC 17025 calibration report stating the measured values and uncertainty is provided with each resistor. Calibration Uncertainty can be located on Guildline’s Scope of Accreditation.

  • Page 15: Operating Instructions

    3.1. INSTALLATION The model 6636 has been shipped with the line input voltage set to 240 V with the fuse removed unless specifically requested to be set to another voltage level. The line input selectors must be set to the correct line voltage before power is applied to the instrument. Remove the warning label positioned across the power cord only after checking the setting of the operating voltage.

  • Page 16: Power Entry Selection

    Section 3 and P2. Set the ohmmeter to the best range for measuring 112 with an excitation current of 1 mA or less. Measure the resistance of the PRT (R ). The change in internal chamber temperature from the previously measured resistance value may be estimated by the following equation: Where R is the previously measured resistance value.

  • Page 17: Maintenance

    Section 4 MAINTENANCE 4.1. PREVENTIVE MAINTENANCE 4.1.1. Cleaning The instrument requires very little maintenance other than periodic dusting of the outside of the enclosure. Use alcohol to clean around the standard resistor terminals to avoid formation of leakage paths. 4.1.2. Temperature Check the internal temperature with the imbedded PRT before using the resistors as references and also periodically.

  • Page 18: Temperature Control

    Section 4 has exceeded 34 °C 3 C, either from a high ambient temperature or failure of the control circuit. Proceed to paragraph 4.3.3. Check the internal temperature with the imbedded PRT to compare the calculated temperature with the value given in the Report of Calibration.
  • Page 19 Section 4 NOTE 2: If this reading is not obtained, check Q1. Check the operation of the temperature sensitive oscillator. If the resistance of RT1/RT2 is greater than the resistance of Rl, then the oscillator should be running. Check with an oscilloscope between TP1 (collector of Q102) and Pl-7.

  • Page 20: Over Temperature

    Section 4 DEVICE VOLTAGE READINGS (Pl-7 Common) HEATER ON HEATER OFF Q101 -3.05 -3.2 -5.2 -3.05 -3.2 -5.2 Q102 -5.4 -5.2 -3.05 -5.4 -5.2 -3.05 Q103 -2.95 -3.05 -5.3 -2.95 -3.05 -5.3 Q104 -1.4 -2.0 -1.45 -----------Variable-------- Q105 -0.75 -1.42 -1.45 -----------Variable-------- -0.75...

  • Page 21: Principles Of Operation

    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...

  • Page 22: Temperature Sensitive Oscillator

    5.2. TEMPERATURE SENSITIVE OSCILLATOR P1-12 P2-D T101 Q102 Q101 P1-10 P2-C RT1/RT2 C104 P2-A P1-9 R110 Figure 5-2: TEMPERATURE SENSITIVE OSCILLATOR Temperature changes are sensed by the thermistor RT1/RT2 connected with Rl across the 1:2 ratio autotransformer T101. As the temperature decreases, the thermistor resistance increases and the voltage divider output to the base of Q101 increases.

  • Page 23: Heater Driver

    5.4. HEATER DRIVER P1-16 -12 V OVER TEMP R114 P2-F Q104 HEATER Q105 HEATER P1-14 P2-E R119 R121 R122 P1-7 P2-J Figure 5-4: HEATER DRIVER The voltage across C107 causes base current in the emitter follower Q104, which in turn drives another emitter follower Q105.

  • Page 24: Power Supply

    5.6. POWER SUPPLY -12 V POWER P1-20 CR106 CR102 P1-16 R107 -8.2 V P1-21 CR107 CR101 C101 Figure 5-5: POWER SUPPLY A universal power transformer T2 allows for operation 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 of R107, CR101 and C101.

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