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1021 Technical Manual
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7.2. Linearity
The linearity of the output is determined by specially matched resistors mounted on the rear
of the digit switch. The matching is done when the 1021 is manufactured. Under normal
operating conditions the high performance of these resistors ensures that the 1021 linearity
will remain within specification for the instrument’s lifetime.
Should the resistors be damaged or become faulty a replacement procedure should be
adopted ensuring that the replacement resistor(s) is matched to the others on that digit
bank. The 1K ohm values should be matched to 0.01%, the 100 ohms to 0.05%, the 10
ohms to 0.5% and the 1 ohm to 5%.