YOKOGAWA 2768, User Manual, Page: 11 / 19

IM 2768-01E
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4. MEASURMENT
4.1 Preliminary Procedure
(1) Check of Galvanometer
Set the POWER SUPPLY function switch to ON, and the push button type switches
BA and GA to OFF.
Then position the galvanometer function switch at B CHECK.
Next, set the galvanometer function switch to INT. GA to check
if the pointer indicates 0 on the scale.
If the pointer is deflected from the zero on the scale, turn the zero adjustment screw to
shift the pointer to the zero on the scale.
(2) Connection of Resistor under Test (Rx)
Connect the resistor to be measured to Rx terminals.
A guard (3 terminal measurement) is required to measure a resistor higher than
100 kΩ accurately. (Fig. 4.1 and Fig. 4.2)
Rx
Rx
Rx
ρ 1 ρ 2
to Rx terminals
to Rx terminals
Conductor
to GUARD
terminal
to GUARD
terminal
GUARD
Fig. 4.1 Rx and GUARD terminal Connection
(3) Selection of Multiplying Factor (Range)
Select the multiplying factor judging from the estimated value of the resistor under test
connected to the Rx terminal.
(Refer to the table listed in paragraph 2.)