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                            NOTES AND CAUTIONS

     This equipment is protected in accordance with IEC Safety Class 1. It has been
designed and tested according to IEC Publication 348, 'Safety Requirements for Electronic
Measuring Apparatus', and has been supplied in a safe condition.   The following pre-
cautions must be observed by the user to ensure safe operation and to retain the equip-
ment in a safe condition.

Defects and abnormal stresses

     Whenever it is likely that protection has been impaired, for example as a result of
damage caused by severe conditions of transport or storage, the equipment shall be made
inoperative and be secured against any unintended operation.

Removal of covers

     Removal of the covers is likely to expose live parts although reasonable precautions
have been taken in the design of the equipment to shield such parts.   The equipment
shall be disconnected from the supply before carrying out any adjustment, replacement or
maintenance and repair during which the equipment shall be opened.   If any adjustment,
maintenance or repair under voltage is inevitable it shall only be carried out by a
skilled person who is aware of the hazard involved.

     Note that capacitors inside the equipment may still   be charged when the equipment
has been disconnected from the supply.   Before carrying   out any work inside the equip-
ment, capacitors connected to high voltage points should   be discharged; to discharge
mains filter capacitors, if fitted, short together the L   (live) and N (neutral) pins of
the mains plug.

Mains plug

     The mains plug shall only be inserted in a socket outlet provided with a protective
earth contacts   The protective action shall not be negated by the use of an extension
lead without protective conductor.    Any interruption of the protective conductor inside
or outside the equipment is likely to make the equipment dangerous.


     Note that there is a supply fuse in both the live and neutral wires of the supply
lead.   If only one of these fuses should rupture, certain parts of the equipment could
remain at supply potential.

     To provide protection against breakdown of the supply lead, its connectors, and
filter where fitted, an external supply fuse (e.g. fitted in the connecting plug) should
be used in the live lead.   The fuse should have a continuous rating not exceeding 6 A.

     Make sure that only fuses with the required rated current and of the specified type
are used for replacement.   The use of mended fuses and the short-circuiting of fuse
holders shall be avoided.

     This equipment conforms with the requirements of lEC Directive 76/889 as to
limits of r.f. interference.

Section 1   GENERAL I N F O R M A T I O N

                   1.1           Introduction
                   1.2           Data s u m m a r y
                   1.3           Accessories

Section 2   OPERATION
                   2.,1          Installation
                   2.,2          Controls and c o n n e c t o r s
                   2.. 3         Preliminaries                                                     9
                   2.. 4         Connecting the component                                         10
                   2. 5          Resistance measurement                                           10
                   2.,6          Inductance m e a s u r e m e n t                                 12
                   2..7          Notes on inductlve l o s s balancing                             16
                   2.8           Using the D. C. Choke Adaptor Type TM 6113                       17
                   2.9           Capacitance m e a s u r e m e n t                                18
                   2.10          Notes on capacitive l o s s balancing                            21
                   2.11          Use of e x t e r n a l o s c i l l a t o r and d e t e c t o r   21

                   3.1           Circuit s u m m a r y                                            23
                   3.2           M e a s u r i n g b r i d g e a. c. supply                       24
                   3.3           M e a s u r i n g b r i d g e d. c. supply                       24
                   3.4           M e a s u r i n g bridge c i r c u i t s                         24
                   3.5           Amplifier d e t e c t o r                                        25
                   3.6           P o w e r supplies                                               26
                   3.7           D. C. Choke A d a p t o r Type TM 6113                           26

                   4.1           General                                                          28
                   4. 2          Removal from c a s e                                             28
                   4.3           A c c e s s t o components                                       28
                   4.4           Mains input adjustments                                          28
                   4.5           Working v o l t a g e s                                          28
                   4.6           R e p l a c e m e n t of valves                                  31
                   4. 7          Adjustment of p r e s e t components                             31
                   4.8           Checking the l o s s b a l a n c e diai calibration              36
                   4. 9          A c c e s s and adjustment to balance control a s s e m b l y    36

                   Universal bridge                                                               41
                   D. C. choke adaptor                                                            53

Section 6   C I R C U I T DIAGRAMS
                   Fig.    6.1   P o w e r supply and o s c i l l a t o r                         47
                   Fig.    6.2   Bridge                                                           49
                   Fig.    6.3   Detector                                                         51
                   Fig.    6.4   D. C. choke a d a p t o r                                        53

1313A (1)
                                     General information

1.1   INTRODUCTION                                     10kc/s; the detector output is available externally
                                                       to allow an oscilloscope or headphones to be used
                                                       for balance indication.
       TF 1313A is a general-purpose impedance
bridge with one tenth per cent measurement                    This bridge can be used for precision eval-
accuracy over a wide range of inductance, capac-       uation of resistance, capacitance and inductance,
itance, and resistance values. It offers except-       for measuring the dissipation factor of capacitors
ional discrimination and resettability, wide-range     and Q of inductors, and for quickly identifying
loss balancing, and facilities for using an external   unknown components. Measurements on high-loss
oscillator and detector.                               components are made easier by the low D and Q
                                                       ranges of the loss balance control and the relative
      The single direct-reading dial used for L,       independence between the adjustment of the main
C, and R measurements has coarse aiid fine con-        and loss balance controls. Its high discrimination
centric controls; the coarse one moves in 1%           and resettability make it particularly suitable for
steps and the fine gives continuously variable         comparative measurements such as checking the
interpolation between steps. The variable and          difference between an unknown and a standard
non-linear sensitivity of the detector facilitates     component. Measurements on inductors carrying
easy measurement of completely unknown comp-           d. c. can be made by using Adaptor TypeTM6113,
onents.    An external audio oscillator can be         which is available as an optional accessory, while
plugged in where L and C measurements are req-         an external d. c. supply can be connected direct
uired at frequencies other than the internal 1 and     for polarizing capacitors.

                                                                     Fig. 1.1   0-1% Universal bridge TF 1313A

                                                                                                       1313A (la)
                                                                                                            General information


 Resistance measurement

        Range                           3 m to 110 M. in eight r a n g e s with m a x i m a of 1 1  , 1 1 0  ,
                                        1.1 k, 11 k, 110 k, 1.1 M, 11 M, 110 M.

        Accuracy :                     Basic measurement e r r o r :

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