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Features / Accessories / Documents

Digital Multimeter
7461A / 7461P / 7451A

High-speed and variable integration time DMM supporting multiple applications

These high-performance and low-price multimeter series consist of three models: the 6½-digit DMM 7461A, the 6½-digit DMM with temperature measurement 7461P and the 5½-digit DMM 7451A.
These multimeters realize high-speed sampling performance with selective sampling modes by adopting the newly developed A/D converter, supporting a variety of applications including digitization of pulse signals, logging measurement at certain intervals.
As another feature, the integration time can be set to any values. This enables correctly measuring the average values of pulsed current/voltage.
In addition, the 7461P is capable of temperature measurement with a resolution of 0.001 ℃ using a PT sensor.
Furthermore, these multimeters are provided with two channel DC voltage measurement (Bch 10V range fixed), so that low cost measurement system architecture is available.


Data collection by high-speed sampling
By adopting the newly developed variable integration time A/D converter, the 7461A or 7461P and the 7451A realize the highest sampling rate of 20,000 readings per sec and 5,000 readings per sec with 3½-digit resolution respectively. The sampling interval can be set from 50 μs to 3,600 s for the 7461A or 7461P, and from 200 μs to 3,600 s for the 7451A, which allows high-speed digitization and data logging at precise measurement intervals. 

Variable integration time for voltage or current average measurement
The integration time can be set from 10 μs to 10 s for the 7461A or 7461P and from 100 μs to 10 s for the 7451A, which allows you to easily measure the average current of cellular phones or LCDs. The newly developed A/D converter of which integration time can be set to any values is based on the analog integration technique, so that it provides precise average measurement data, differently from the digital method using a discrete sampling.

Full array of trigger functions
Various types of measurements are supported by the built-in trigger functions such as the level trigger and the delta trigger.
Maximum sampling rate: 200 readings/s (from 5 ms)

Low power resistance measurement
In resistance measurement, measurement current may cause heat generation in a measured device and variation in its measured values. Low-power 2 WΩ/4 WΩ resistance measurement uses only 1/10 of the typical measurement current, minimizing the effect of thermal fluctuation.

Temerature measurement with a resolution of 0.001 ℃ (7461P)
Additionally,  the 7461 is capable of temperature measurement with a resolution of 0.001°C using a PT sensor. It is useful in various fields including automotive, home appliance, air-conditioning, energy control, medical and industrial equipment fields.
The 7461P signal ouptut can be selected from comparator output and digital output. In particular, digital signal output is useful for controlling opening and closing external devices, allowing easy system configuration.

  7451A 7461A 7461P
Maximum display 319 999  1 199 999
Measurement speed (readings/s) 5,000 max 20,000 max
Variable integration
DC voltage measurement 1 μV to 1000 V 100 nV to 1000 V
Accuracy (typical value) 0.01 %/year 0.0035 %/year 
DC current measurement 10 nA to 3 A 1 nA to 3 A
Resistance measurement 100 μΩ to 300 MΩ 100 μΩ to 100 MΩ
AC voltage measurement (True RMS) 1 μV to 700 V  100 nV to 700 V
AC voltage frequency range  20 Hz to 300 kHz 20 Hz to 300 kHz
AC current measurement (True RMS) 10 nA to 3 A 1 nA to 3 A
Calculation function
Temperature measurement N/A             N/A             Pt100 (-200 ℃ to 
+850 ℃)/JPt100 
Data memory 10,000   10,000 20,000 
Interface USB, GPIB

*For the detailed specifications, please download the brochure from "Documents."