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- ADCMT Digital Multimeter 7481
8½-digit high-precision and high-accuracy digital multimeter for system calibration
8½-digit high-precision and high-accuracy digital multimeter for system calibration
The 7481 is an 8½-digit digital multimeter with high resolution of 0.01 ppm. It is suitable for use in research and development fields or calibration organizations, and calibration of inspection systems for electronic components or semiconductors. The 7481 achieves high-resolution measurement such as 10 nV for DC voltage measurement, 100 fA for DC current measurement and 1 μΩ for resistance measurement, and also guarantees high relative accuracy 5 ppm per year for voltage measurement.
In addition, the self-calibration function allows high-accuracy measurement at any time, and external calibration can be performed with a smaller number of standards. The 7481 has not only the GPIB and the USB as interface for automatic systems but also input terminals on the rear panel for easy system configuration.
Digital Multimeter
Model:
7481
Maker:
ADC CORPORATION
Features
| High-accuracy digital multimeter equipped with simple calibration function | ||||
| DC voltage | Resistance | DC current | DC voltage ratio | |
| Maximum display | 119 999 999 | 119 999 999 | 11 999 999 | 99 999 999 |
| Relative accuracy* | 0.5＋0.1 | 2＋0.2 | 5＋10 | 1.25＋0.25 |
| Condition | 10 V range | 10 kΩ range | 1000 μA range | 10 V range |
| *Relative accuracy: ppm of reading ± ppm of range, 23°C ± 1°C, 24 hours | ||||
| All you need to perform external calibration for the 7481 are two sources: a DC voltage standard (10 V) and a resistance standard (10 kΩ). By the two-source calibration and the self-calibration function, all rages of DC voltage, DC current and resistance are calibrated and internal errors due to ambient temperature change can be removed. As a result, high-accuracy measurements are guaranteed. Calibration values are stored in the internal memory together with its calibration date, and these data can be read out by the GPIB or USB. | ||||
| High-precision A/D converter | ||||
| The 7481 adopts a self-developed multi-scope integration system for A/D conversion. So, it realizes high-precision linearity and excellent stability as standard, making it possible to perform high-accuracy measurements. | ||||
| Low-noise design | ||||
| The 7481 offers measurement with less dispersion by its low-noise ranging amplifier. | ||||
| Ratio measurement function | ||||
| In ratio measurement, the reference DC voltage is measured by using the 4 WΩ measurement terminal in addition to normal DC voltage measurement, and its voltage ratio is gained by calculation. Using this function, it is possible to measure attenuator voltage division ratio and electric power, eliminating error factors of the external supply source in resistance measurement. | ||||
| Various functions convenient for measurements | ||||
| 50,000 data internal memor | ||||
| Front/rear input terminal external control | ||||
| 4-wire contact check function | ||||
| Comparator function | ||||
Specification
| Maximum display | 119 999 999 |
| DC voltage measurement | 10 nV to 1000 V |
| Accuracy (typical value) | 5 ppm/year |
| DC current measurement | 100 fA to 1 A |
| Resistance measurement | 1 μΩ to 1000 MΩ |
| AC voltage measurement (True RMS) | N/A |
| AC current measurement (True RMS) | N/A |
| Calculation function | ✓ |
| Temperature measurement | ✓ |
| Data memory | 50,000 |
| Interface | GPIB , USB |
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