IM 2769-10E
―
10
―
5. CAUTIONS
5.1 Cautions for Operation
(1) Insert the multiplying factor switching plug securely into the jack.
(2) Be sure that the GA sensitivity switch is first set to G
2
position.
Then, proceed to G
1
, and to G
0
.
(3) The maximum allowable current of each built-in resistor is indicated on the panel respectively.
Be sure not to exceed this current value. (Refer to Table 2.1 of 2. SPECIFICATIONS.)
(4) Never fail to BA switch to
and GA sensitivity dial to
GA
OFF
, when the measurement is completed.
5.2 Cautions for Maintenance
(1) When the instrument is used after a long period of time,
clean carefully the multiplying factor switching plug, dial and
the slide resistor of the measuring dial, with soft clean cloth.
In this case, be careful not to change the contacting pressure of the slider of the slide resistor.
(Avoid using sandpaper or the like when cleaning.)
(2) Remove the self-contain batteries when the instrument is stored for a long period.
(3) The panel and case of this double bridge are made of ABS resin and
has sufficient mechanical strength.
However, they are low resistive against heat and chemicals.
An organic solvent, such as lacquer thinner, should be strictly avoided
when cleaning the panel or case.
5.3 Calibration
Periodic calibration (once a year) is to be conducted in the following manner.
5.3.1 General Check
(1) Check the dials, name plate, terminals, plug, switches, etc., and
see if there are loose connections or defects.
(2) Check if the self-contained battery is exhausted.
5.3.2 Check on Operation
Measure the value of a standard resistor (100 Ω, 10 Ω, ....., 0.001 Ω), and check that
the measured result is within allowable error of 0.5% at 1.0 and 10 on the dial scale.
For this check, use of the 2792A or 2792 Series standard resistor is recommended.
(2792 Series have been discontinued.)
