- There are three models in this digital multimeter series: 7461A (6½ digits), 7461P (6½ digits with temperature measurement function), and 7451A (5½ digits), which have achieved high performance and low cost.
With the high-speed sampling function that uses an A / D converter, the sampling speed can be set arbitrarily. Therefore, it can be used for a variety of applications, from digitizing pulse signals to spaced logging measurements.
In addition, the function that can set the integration time arbitrarily enables accurate measurement of the average value of pulsed current and voltage.
In addition to these functions, the 7461P is capable of measuring temperatures with a resolution of 0.001 ° C using a platinum resistance temperature detector.
For systematization, it is equipped with two DC voltage measurements (fixed Bch 10 V range), so a lower cost measurement system can be constructed.
- 3 models are available according to the application
6½ digit display (7461A)
6½ digit display enables temperature measurement by Pt (7461P)
5½ digit display (7451A)
- High-speed sampling: 20,000 times / second (7461A / 7461P), 5,000 times / second (7451A)
- Variable integration function: 10 μs (7461A / 7461P) / 100 μs (7451A) to 10 s
- 2-channel input for DC voltage measurement
- Digital output (7461P) that can remotely control external devices
- Supports SCPI commands (7461A / 7461P / 7451A)
Data can be collected with high-speed sampling
By adopting the newly developed variable integration AD converter, the maximum sampling of 7461A / 7461P at 3½ digit resolution is 20,000 times, and that of 7451A is 5,000 times. Up to, the 7451A has achieved a measurement speed of 5½ digits, which is the highest level in its class. In addition, the sampling interval can be set from 50 μs to 3,600 s for the 7461A / 7461P and 200 μs to 3,600 s for the 7451A, so it is possible to perform accurate measurement interval data logging from the high-speed digitizing function. is.
|Maximum number of samplings (times / s)||memory||
5,000 / s
|20,000 / s||20,000 / s|
|GPIB||1,000 / s||1,000 / s||1,000 / s|
|Integration time||100 μs to 10 s||10 μs to 10 s||10 μs to 10 s|
|Sampling period||200 μs to 3,600 s||50 μs to 3,600 s||50 μs to 3,600 s|
|Maximum number of digits in 1 PLC||5½ digits||6½ digits||6½ digits|
|Measurement data memory||10,000||10,000||20,000|
* PLC: Power Line Cycle
Variable integration function that makes it easy to measure the average value of voltage and current
The 7461A / 7461P can set any integration time from 10 μs to 10 s, and the 7451A can set any integration time from 100 μs to 10 s. It is now possible to easily measure the average current consumption of mobile phones and LCDs. The newly developed variable integration AD converter can set the integration time of the AD converter itself arbitrarily and integrates with an analog amount, so unlike the digital method, wave loss does not occur during the integration time and an accurate average value can be measured. ..
Various measurements are possible with various trigger functions
Since it has a built-in level trigger that starts measurement when the level changes and a delta trigger function that starts measurement at the change width (⊿ value), it supports measurement in various situations. The maximum sampling speed at that time is about 200 times / sec (5 ms ~).
Low power resistance can be measured with 1/10 low current
In resistance measurement, the measured current may affect the object to be measured, such as heat generation, and the resistance measurement value may fluctuate. However, with low power resistance measurement 2 WΩ / 4 WΩ, the measured current is set to the normal 1 Since it can be measured at / 10, it is possible to reduce the effect of thermal fluctuations.
Temperature measurement with 0.001 ° C resolution is possible (7461P)
In addition to these unique DMM features, the 7461P is capable of 0.001 ° C resolution temperature measurements with platinum resistance temperature resistors. Therefore, the applications of DMMs are further expanded to include automobiles, home appliances, air conditioning, energy management, medical care, and inspection of industrial equipment. In addition, the output signal of the 7461P can be selected from comparator output and digital output. In particular, digital signal output can be used for control signals such as opening and closing of external devices, facilitating systematization.