Cropico MTS Series

A test standard for milliohmmeters with 4 terminals and +/- full scale values

The MTS range of milliohmmeter test standards are designed for the simple and easy calibration of low resistance ohmmeters and Kelvin/Thomson bridges. The four terminal resistance values are switch selected and provision is made + and - full scale values. A four terminal zero value may also be selected, thus making zero and full scale calibration of instruments simplicity itself.

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Specifications

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Technical Specifications - MTS1A

MTS1A - Part Number: 930240
Resistance Value	Uncertainty of Adjustment at 20°C	Power Max (W)	Current Max (A)	Typical Temperature Coefficent
100kΩ	±0.01%	0.1	1mA	<10ppm/°C
10kΩ	±0.01%	0.1	3mA	<10ppm/°C
1kΩ	±0.01%	0.6	25mA	<10ppm/°C
100Ω	±0.01%	0.6	75mA	<10ppm/°C
19Ω	±0.01%	0.43	150mA	<10ppm/°C
10Ω	±0.01%	0.45	212mA	<10ppm/°C
1.9Ω	±0.01%	0.475	500mA	<10ppm/°C
1Ω	±0.01%	0.56	750mA	<10ppm/°C
100mΩ	±0.01%	0.625	2.5A	<10ppm/°C
10mΩ	±0.05%	0.25	5A	<10ppm/°C
1mΩ	±0.05%	0.1	10A	<10ppm/°C

Three models are available, the MTS1A which has 11 values from 1mΩ to 100kΩ and the MTS2 has 10 values from 400µΩ to 400kΩ, making it ideally suited for the calibration of digital instruments with a long scale length of 4,000 or 6,000 count. The MTS3 is designed for easy calibration for units such as the Cropico DO7010, where a pulsed current is produced. The test standards are housed in a rugged bench portable aluminium case with tilt handle. The internal standards are manufactured from premium quality resistance wire with low temperature and load coefficients. The units are supplied complete with a calibration certificate.

MTS2

MTS2 - Part Number: 930241
Resistance Value	Uncertainty of Adjustment at 20°C	Power Max (W)	Current Max (A)	Typical Temperature Coefficent
400kΩ	±0.01%	0.1	0.45mA	<10ppm/°C
40kΩ	±0.01%	0.1	1.5mA	<10ppm/°C
4kΩ	±0.01%	0.1	5mA	<10ppm/°C
400Ω	±0.01%	0.1	15mA	<10ppm/°C
40Ω	±0.01%	0.1	50mA	<10ppm/°C
4Ω	±0.01%	0.1	150mA	<10ppm/°C
400mΩ	±0.01%	0.1	500mA	<10ppm/°C
40mΩ	±0.01%	0.1	1.5A	<10ppm/°C
4mΩ	±0.1%	0.4	10A	<10ppm/°C
400μΩ	±0.1%	0.04	10A	<10ppm/°C

MTS3

MTS3 - Part Number 930242
Resistance Value	Uncertainty of Adjustment at 20°C	Current Max 2 Seconds (A)	Typical Temperature Coefficient
5Ω	±0.05%	1A	<10ppm
500mΩ	±0.05%	10A	<10ppm
50mΩ	±0.05%	10A	<10ppm
5mΩ	±0.1%	10A	<10ppm

The MTS3 is not intended to be used for measurments where a continuous current is used

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Technical Specifications

Technical specification
Working Temperature	+5 to +40°C
Storage Temperature	+5 to +50°C
Dimensions	215mm x 88mm x 250mm (W H D) approx
Mass	2.8kg approx
Terminal	4mm binding posts will accept spade tags and 4mm banana plugs. Low thermal E.M.F. types are used for the potential terminals
Switches	Combination switch with low thermal contacts for the potential selection and low resistance contacts for the current selection

Technical specification
Working Temperature	+5 to +40°C
Storage Temperature	+5 to +50°C
Dimensions	215mm x 88mm x 250mm (W H D) approx
Mass	2.8kg approx
Terminal	4mm binding posts will accept spade tags and 4mm banana plugs. Low thermal E.M.F. types are used for the potential terminals
Switches	Combination switch with low thermal contacts for the potential selection and low resistance contacts for the current selection

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