Cropico has launched the 3000 series of portable, high-accuracy digital temperature indicators that features three units, all with one milli-Kelvin resultion for real-time displays. The series, designed for precision temperature measurement in a range of electronics, industrial, scientific and environmental monitoring applications, comes with a choice of inputs for platinum resistance digital thermometers and all popular thermocouple types.
The Cropico 3000 has inputs for Pt25 and Pt100 platinum resistance thermometers and thermocouples. The 3001 offers the same flexibility but does not include the PT25 input option, while the 3002 is designed for use with Pt100 platinum resistance thermometers only.
Monday, 19 July 2010
Thursday, 15 July 2010
Self Heating Thermometers - Resistance Measurement
Self-heating Thermometers
This effect can be minimised by using a large sensor element that is in good thermal contact with its measurement environment, while allowing sufficient time for the temperature to stabilise. An alternative is to use a short measurement pulse of current thus minimising the heating effect. A good thermometer may be configured to measure with either a continuous or a short current pulse ensuring that the best possible measurement is made.
Resistance Measurement
To measure the resistance of the temperature detector, a current must be passed through the device - typically a current 1mA to 5mA. A source current of 1mA flowing through the 100Ω resistance will generate 100μW of heat. If the sensor element is unable to dissipate this heat it will indicate an artificially high temperature.This effect can be minimised by using a large sensor element that is in good thermal contact with its measurement environment, while allowing sufficient time for the temperature to stabilise. An alternative is to use a short measurement pulse of current thus minimising the heating effect. A good thermometer may be configured to measure with either a continuous or a short current pulse ensuring that the best possible measurement is made.
Tuesday, 29 June 2010
D07 Plus - Accurate Low Resistance Measurement
Electric review has posted an article on the latest offering from Cropico, here is an excerpt with a link to the full article at the end of the post.
The Digital Ohmmeter D07Plus from Cropico, a specialist supplier of precision measurement
Adding to the popular Cropico digital micro ohmmeter range, the versatile, rugged and easy-to-use D07Plus simplifies resistance associated with electrical connections, weld integrity, cable and joint resistance, electric motors and other engineering applications.
Read full article here.Useful Links
Digital Thermometers, Temperature Measurement & Resistance Measurement from Cropico
Wednesday, 23 June 2010
What is an Ohmmeter?
An ohmmeter is a piece of electrical test equipment designed to measure electrical resistance, the opposite of electrical current (for that we use current meters).
There are two types of ohmmeter:
R= V / I
Therefore Resistance is equal to voltage divided by a constant current (I) which is provided by the ohmmeter itself.
For high precision measurements the above types of meter an inadequate. A high precision ohmmeter is required
There are two types of ohmmeter:
- Micro ohmmeter (microhmmeter or microohmmeter) - These make low resistance measurements.
- Megohmmeter (or megaohmmeter) - These devices measure larger resistance values.
R= V / I
Therefore Resistance is equal to voltage divided by a constant current (I) which is provided by the ohmmeter itself.
For high precision measurements the above types of meter an inadequate. A high precision ohmmeter is required
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