Time Electronics
1041 Resistance Decade Box User Manual
9
5 Maintenance and Repair
Dismantling the Instrument
Remove the rubber protection cover then removal of four screws enables the metal case
cover to be taken off which provides access to all parts of the instrument.
Repair
NOTE: No repair work should be undertaken by the customer while the instrument is under warranty as such
work may render the warranty invalid.
Certain of the precision components used in this instrument are not readily available and
make repairs by the customer difficult if these components are damaged.
Overload conditions can cause a unit failure
To avoid overload, power dissipation in the resistive elements must be kept below 1 W.
To achieve this the maximum current must not exceed that given in the RANGE table shown
in specifications. Current will be proportional to the applied voltage. The maximum allowed
working voltage that can be applied at the maximum setting for each range is also shown in
the table.
If multiple banks are being used, the current must not exceed that of the lowest rated bank.
For example, if you set 107.79 Ω:
• The 100 Ω bank switch to 1.
• The 10 Ω bank switch to 0.
• The 1 Ω bank switch to 7.
• The 0.1 Ω bank switch to 7.
• The 0.01 Ω bank switch to 9.
In this setting the 100 Ω bank has the lowest current rating at 100 mA, therefore the current
flowing through all the selected resistive elements in all the banks being used, must not
exceed 100 mA.
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