Time Electronics
1041 Resistance Decade Box User Manual
6
3.3.2 Setting Resistance
Before use it is recommended that all the digit thumbwheels are rotated completely 2 times.
This will ensure the contacts are self-cleaned, maximizing their low contact resistance.
This is particularly beneficial if the decade box has not been used for a long time.
It is imperative that the switch setting should be unambiguous to avoid misreading the set
value. To prevent misreading, the 1041 incorporates a colour coding system to divide the
setting into 2 groups corresponding to ohms and milliohms.
To set resistance, use the thumbwheel digit switches to set the required values according to
the decade ranges.
For example, to simulate 138.51 Ω equivalent to 100
°C Pt100 (ITS-90):
• Set the 100 Ω bank switch to 1.
• Set the 10 Ω bank switch to 3.
• Set the 1 Ω bank switch to 8.
• Set the 0.1 Ω bank switch to 5.
• Set the 0.01 Ω bank switch to 1.
For a quick reference to the setting values of the 1041, please see the Resistance Setting
Table on the following page.
Note: All resistance boxes have a residual resistance, meaning that when the dials are set to zero a
small resistance remains. If you are making precision measurements or recalibrating the instrument,
this residual value must be subtracted from all measurements.
Typical values of residual resistance are shown in the specifications.
For precise values relating to your specific unit, refer to calibration certificate (if ordered).
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