New products now available from Measurements International.
Developed & designed by metrologists for metrologists & calibration technicians
Measurements International’s new Automated Resistance Standard model 1310A is an easy-to-use, cost-effective calibration instrument that will give the military sector, national and third-party laboratories complete confidence in resistance standards. Designed with input from a world-leading National Measurement Institute, customers can be confident this new design offers exceptional calibration results.
|9 resistors 1 Ω, 10 Ω, 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ, 1 external channel.||Complete line of decade value standards in one temperature-controlled enclosure.|
|Hand-picked high precision resistors in temperature-controlled chamber.||Delivers highest level of performance from the internal high precision resistors.|
|Internal resistance elements in a temperature-controlled chamber.||Excellent stability and extremely low-temperature coefficients.|
|Single output cable for direct plug-in.||Easy operation without requirement for changing wires.|
|Built for calibration of calibrators and DVMs.||Best stability < 2.5 μΩ/Ω/Year.|
|Built-in 4-terminal scanner.||Combining two instruments into one simple to use instrument.|
|External extra channel.||Connect to resistance value of your choice.|
|Front panel or GPIB controlled.||Simplifies operation for user.|
|Internally mounted temperature sensor PT100.||Users can connect to front panel and monitor internal oven.|
Figure 1. Drift of MI Resistor Over a 10 Year Period
Figure 2. 24 Hour Stability Testing Internal Temperature Chamber
Three Standards – One Box
Measurements International’s recently launched Automated Artifact Calibrator (1330A) is a highly versatile, accurate instrument that meets laboratory requirements for automated artifact calibration (to assign values to internally generated parameters) on calibrators and DMMs.
This process is typically performed using a small number of standards at recommended calibration intervals indicated in the calibrator or DMM manufacturers manual. The 1330A is composed of a temperature-controlled instrument enclosure, three reference standards, and a battery backup. Power supply is external (part of the power cable).
|Primary 1 Ω, 10 kΩ and 10 V references.||All standards provided in one temperature-controlled enclosure.|
|Clear connection for JVolt Comparison of 10 V Zener.||Providing highest level traceability.|
|Manual (push buttons on front panel) or automated control (select by GPIB interface).||Ability to select appropriate standard (choice of 3) for calibration.|
|Output connections to calibrator or DMM on front panel.||Choice of cables available (and supplied) feature direct plug-in for 57XX series calibrators or to the 3458A DMM.|
|Current standard value is extrapolated from prior calibrations.||Enhanced automation and improved accuracy.|
|Oven temperature monitored by internal PRT.||Provides better performance of artifacts as temperature
environment is stable and controlled to less than 100 m°C.
|Calibrated values of the standards entered in the unit.||No requirement for set-up.|
|Front panel display showing certification value.||Quick access and reference to information.|
Simplify Your Procedures. Simplify Your Work.
Never before has DC voltage calibration and/or verification of DVMs and calibrators been so easy or reliable. Measurements International’s recently launched 1340A is the metrology industry’s leading choice thanks to its simplistic design, backed with the best features for optimal performance.
Model 1340A is another fine example of MI’s history and world-leading experience in resistance. We invite metrologists and calibration technicians in national, military and third-party calibration laboratories to compare the performance of the 1340A against any products on the market today.
|10:1, 100:1 and 1000:1 reference divider outputs to 1100 V||Extreme precision to compare direct voltage levels of various sources to a 10 V voltage reference standard like a 1330A, 732B or 732C.|
|Industry-leading specifications require no self-alignment or calibration prior to use.||Customers no longer need to self-align or calibrate prior to each use. Saves time and money and frustration!|
|Utilizes a special design network of high precision resistors mounted in a temperature-controlled chamber.||Shields divider resistors from outside noise and provides temperature stability to improve performance.|
|Front panel direct connection to calibrator; divider output connection to DVM for testing; both done with supplied cables.||Ease of use, saves time and money.|
|Internally mounted temperature sensor PT100.||Users can connect to front panel and monitor
|New special hand-selected resistors and configuration.||Lengthy, self-alignment no longer required to create divider network.|
|Calibration of divider performed directly against a 1330A, 732B or 732C reference.||Industry-leading advancement in the DC voltage divider commercial products which delivers exceptional performance.|
Figure 1. Example: 1000 V in divided to 10 V out to be measured
Offering the easiest-to-use instrument with complete confidence.
Figure 2. The above diagram illustrates using a 1330A, 732B or 732C reference in the connection sequence. A DVM can be used as a NULL detector to determine the offset of the 57XX series on the 10:1 and 100:1 ratio.
No Self-Alignment Required
Figure 3: 24-Hour Stability of Temperature Chamber
The Measurements International model Z1000 prototype and initial design were done by METAS in Switzerland. It was designed to address and fill the need and requirement for a better way to calibrate LCR meters. The current method of calibration of LCR meters requires highly accurate impedance standards (inductors, capacitors and resistors) that have to have traceability maintained, in which the procedure for calibration is time-consuming and requires a lot of manipulation of the standards making the measurement procedure complicated. Another large drawback of the previous method was that only a small fraction of the measurement capability of the LCR meter is tested because the reference standards usually have a decade value and phase angles close to the -90 degrees (capacitors), 0 degrees (resistor) or 90 degrees (inductors).
With the release of the commercial Z1000 iSimulator, the process for calibration of LCR meters has been taken to a new level. The Z1000 covers the full calibration of LCR meters over simulated impedances from 100 Hz to 20 kHz while eliminating the need for external standards and providing a much simpler, easier-to-use method of LCR meter calibration.
If you are familiar with the current method used to calibrate LCR meters (external inductors, resistors, capacitors) then you are aware of the very time-consuming and multiple manual manipulation components of the process. The Z1000 was designed with this in mind. It was designed with a very user-friendly operational software that limits customer manual need for changing of connections and offers a simple step-by-step operation that provides constant automatic verification of the setup, and automatic switching and measurement procedures.
The Z1000 offers a new more advanced approach. In the Z1000, the current and the voltage measured by the LCR meter to calculate the impedance are independently generated by two external voltage sources.
Adjusting the amplitudes and the relative phase of the voltage sources, the synthesized impedance can cover the entire complex plane. This concept was first proposed in 1994. More recently, a new design of the Z1000 – based on recently available, high-grade electronics components that have been designed.
The Z1000 covers calibrations in the frequency range from 100 Hz to 20 kHz and the magnitude of the synthesized impedance ranges from 1 Ω to 10 MΩ with an arbitrary phase angle.
S1 supplies the voltage to HP, the second source S2 supplies the current to the LC port. Then the LCR meter calculates the value of the impedance. Because the two sources are independent, it is possible to arbitrarily choose the relative phase between the two, therefore the resulting impedance can be simulated to cover the entire complex plane.
A single MUX is used to accurately measure the actual voltage Vv supplied to HP input, and the voltage drop Vi generated by the current flow through ZCB.
The accuracy of the Z1000 is based on the accuracy of the LCR meter under test. This is because the uncertainty of the resistor is around 10-8 and the uncertainty of the clock is 10-12. Most LCR meters have a specification of about 500 ppm. When calculating the overall uncertainty, the resistor and clock are negligible!