MR 300 C-A
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MR300C-A For objects with an extremely low resistance High Precision Resistance Meters Micro-ohmmeters The MR300C-A micro-ohmmeter enables you to perform highly accurate resistance measurements at objects with an extremely low resistance such as cables, contacts, fuses, power connections, graphite, carbon and metal samples. In the lowest measuring range of 100 µΩ the resolution is 10 nΩ! The MR300C-A micro-ohmmeter features a constant current system, which guarantees an extremely stable measuring current (max. 10A) during a measurement. The measuring result is calculated as the quotient of the voltage drop across an internal reference resistor and the (amplified) voltage drop across the test object. Before each main measurement, in which the measuring current flows, a zero measurement without measuring current is performed, in which any offset voltages, in particular the thermoelectric voltage, are determined at the test object. The zero point stored is compared with the actual value determined in the actual main measurement. After this, the result is displayed. Possibly a temperature conversion (see below) or other customer-specific conversions (e.g. linearization) are carried out before the result is displayed. Furthermore, the test object is measured more accurately, as it does not heat up. The temperature measurement converts the measuring value obtained to 20 °C using a coefficient of 0.392%/K for copper and 0.400%/K for aluminium. The object temperature is measured via a probe (option) or entered directly, the conversion can be switched off. Direct input of the temperature is the standard. As the MR300C-A performs a quotient measurement with exclusive reference to the internal reference resistances and compensates the offset voltages of the amplifiers and the thermoelectric voltage at the test object, an extreme stability of the measured values over long periods is reached. Due to this complex measuring procedure the measuring time of the MR300C-A is a little longer than that of comparable instruments. On the other hand, it is this complexity that guarantees the high accuracy and the The measurement error reached only very high long-term stability. depends on the stability of the reference The measuring current does not flow resistors. The modification and ageing continuously, but only for a short period of any components do not affect the of a measurement. For this reason, the result of the measurements in any way. heating-up of the instrument is Unlike reference voltages and currents, reduced, and therefore a more compact such long-term stable resistances can be realised easily. design of the MR300C-A is possible. Features • Measuring range from 100 µΩ – 10 kΩ, Ω Ω decadic • Overrange up to 80 % • max. resolution of 10 nΩ Ω • Display 4 ½ digits • Measuring error ≤ ± 0,02 % to ± 0,03 % depending on range • Temperature measurements and conversion to 20 °C (switchable) • Current flow time only 600 ms per measurement • Contact error detection prior to every single measurement • RS232C port to get external control over the instrument email: sales@schuetz-messtechnik.com Here you will get technical assistance as well as complete information regarding features, prices, shipment and reselling. Made in Germany SCHUETZ MESSTECHNIK GMBH, Rheinstrasse 7a, D-14513 Teltow 7. Edition August 2012. Cha

High Precision Resistance Meters Micro-ohmmeters Resistance measurement Range Overrange Max. error Max. error Measuring method Current Range selection Display Current flow time Temperature Compensation 100.00 jW - 10.000 kW, decadic 80%, to 17.999 (e.g. 179.99 |jW) ± 0.03% of reading ± 3 digit (100 jW - 1 mW) ± 0.02% of reading ± 2 digit (10 mW - 10 kW) integrating dual slope quotient 100 jA (10 kW) to 10 A (100 jW) automatically, using keypad, via RS232 LED, 4 V digits approx. 600 ms PT100: Copper - Aluminium selectable Available enhancements • PT100 1/10 DIN Temperature Probe • IEEE - 488...