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      PRACTICAL TECHNIQUES & KNOW-HOW FOR MAKING & MEASURING IN THE LABORATORY & WORKSHOP

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The Ronan X85 Calibrator

The Ronan X85 calibrator is a versatile voltage, current and resistance reference source and measuring device. With calibrated output and input sides is can be applied to a wide range of calibration tasks including the determination of dc transfer characteristics or active components and modules. The user and service manual can be downloaded here and a set of schematics at a higher resolution, from here.

The instrument was tested throughout its voltage ranges by comparison with a Solartron 7150plus Multimeter interfaced to a computer via a National Instruments GPIB-232CT-A converter. 10 settings in each of the voltage ranges, 100mV, 1V, 10V were measured and the results shown in the table below.

100mv range		1 volt range		10 volt range
Set volts	7150 reading	set volts	7150 reading	set volts	7150 reading
0.00000	0.000019	0.000000	0.000052	0.000000	-0.000619
0.01003	0.010045	0.099700	0.099658	0.998000	0.997280
0.02019	0.020216	0.200700	0.200705	2.009000	2.008600
0.03025	0.030260	0.300700	0.300650	3.009000	3.008700
0.04024	0.040264	0.400000	0.400050	4.004000	4.003500
0.05034	0.050358	0.500400	0.500400	5.008000	5.007700
0.06040	0.060415	0.600300	0.600370	6.009000	6.008200
0.07044	0.070460	0.700100	0.700260	7.007000	7.007600
0.08046	0.080487	0.799800	0.799930	8.005000	8.005300
0.09037	0.090419	0.898500	0.898650	8.993000	8.993300

Within the limitations of the 4 1/2 digits of the Ronan Calibrator compared with the 6 1/2 digits of the Solartron 7150plus, the table shows an excellent correspondence between the two instruments.