IM 2768-01E
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7. FOR MORE EFFECTIVE USE OF THE INSTRUMENT
7.1 How to Use the Measuring Dial (Rs)
The measuring dials (Rs) can be used as 5 dial variable resistors by separating them from
the bridge circuit.
The accuracy is 0.006% in maximum as shown in paragraph 2.
It can be varied from 0.1 Ω to 11.1110 kΩ in 0.1 Ω step.
Use Rs terminals and set POWER SUPPLY function switch to OFF to use
this instrument as a variable resistor.
7.2 To Connect External Accessory Equipment
(Galvanometer and Power Source)
When an external galvanometer which sensitivity is higher than the internal galvanometer,
or any additional power sources are required for measurement, connect them as follows:
(1) Connection of External Galvanometer
Connect the required galvanometer to EXT. GA terminals.
Set the galvanometer function switch to EXT. GA.
At the same time, the guard and the ground must be secured.
Electronic Galvanometer 2709 is recommended to be used as an external galvanometer.
(Maximum sensitivity 0.2 µA/div, input resistance 1 kΩ.)
Note: Model 2709 has been discontinued.
(2) Connection of External Power Source
When a battery or a DC power source unit is required to be installed externally,
connect it to EXT terminals and set POWER SUPPLY function switch to
EXT. Ground side terminal of EXT. BA terminals.
Accordingly connect the ground side of the external power source unit to side
of this instrument.
(3) Caution
(a) When internal batteries are not in use for long period,
remove the batteries from the instrument.
(b) In case a DC power source unit is used, if the ripple of the unit is large,
the satisfactory operation of the galvanometer may not be expected
due to the influence of the large ripple.