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Digital Multimeter
7461A / 7461P / 7451A
- Three models by use
- 6½-digit display (7461A)
6½-digit display and temperature measurement by Pt (7461P)
5½-digit display (7451A) - Fast sampling : 20,000 readings/sec (7461A/7461P)
5,000 readings/sec (7451A) - Variable integration time: 10 μs to 10 s (7461A/7461P)
100 μs to 10 s (7451A) - High-resolution DCI measurement: 1 nA (7461A), 10 nA (7451A)
- Two-channel DCV measurement
- Full array of trigger functions
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 10 V range fixed), so that low cost measurement system architecture is available.
Features
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.
| Function | 7451A | 7461A | 7461P | |
|---|---|---|---|---|
| Maximum sampling rate (readings/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 display/PLC | 5½ digits | 6½ digits | 6½ digits | |
| Data memory | 10,000 | 10,000 | 20,000 | |
*PLC: Power Line Cycle
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.
Temperature 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.
Easy System Configuration by Two-channel DCV Measurement
With the DCV-Bch input (10 V range fixed), current measurement and two-channel voltage measurement can be switched, which enhances the measurement throughput. (Rating voltage between Bch Hi and COM: ±12 V)
Applications
Standby Current Measurement of Cellular Phone
In a cellular phone, the peak current flows in the standby state at a constant period, and the base current flows in other states. This standby time varies depending on the adopted method. To measure the average current precisely, it is necessary to measure all current passing during the standby time. The 7461A or 7461P and the 7451A are capable of current waveform measurement including peak current measurement by fast sampling of 20,000 readings and 5,000 readings per second respectively. Also, these models are capable of accurate average current measurement by using the variable integration time function, in which the integration time can be set to any value up to 10 seconds.
Rising Signal Measurement by Delta Trigger and Pre-Trigger
The delta trigger starts measurement by detecting the slope of a signal. This function is convenient for starting measurement when data increases or is stabilized after convergence, and also supports various kinds of change patterns.
The pre-trigger is used to capture data before the trigger event. This function is convenient for analyzing signal states, for example, when an abnormal measurement value is detected.
Thermistor Low-Power Resistance Measurement
These multimeters are equipped with the low-power resistance measurement function as standard. This enables measurement of a thermistor or other heat sensitive elements with reduced effect from self-heating. When a thermistor is measured in the 1 kΩ range with the normal 4 WΩ function, the measurement current is 1mA and the resistance values will change significantly. On the other hand, the LP4WΩ function is used, the measurement current is 100 μA which is 1/10 the normal value 4 WΩ, and there will be small change in resistance values.
Low-Noise Current Measurement (7461A/7461P)
The 7461A and 7461P are stable in low current measurement and also highly sensitive with the minimum resolution of 1nA. Their performance is quite useful for evaluation and inspection of portable devices and electronic components that require low current consumption.
Evaluation of Solar Cells (7461P)
In the solar cell evaluation system, the 7461P is capable of shutter open/close control on the solar simulator by using the ambient tempeature measurement and digital output functions.
Specifications
Choice from Three Models According to Usage
This DMM series has three models: 5½-digit 7451A, 6½-digit 7461A, and 6½-digit 7461P capable of temperature measurement. As each of them has the high-speed sampling function, large data memory capacity and abundant external control signals, you can select the best model according to your use.
| 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 "Download."
Appearance
Supplied Accessories
Optional Accessories
High-Voltage Probe 1116
Voltage dividing ratio: 1: 1000
Input voltage dividing ratio precision: ±5 % (at 1000 V input)
Input resistance: 1000 MΩ
Maximum allowable input voltage: DC 24 kV (successive), DC 36 kV (30 s), (nominal value)
| Name | Part Number |
| Input cable (general-purpose, with test probes) | A01001 |
|
Input cable (for 4-wire resistance measurement) |
A01006 |
| Input cable (test probe) | |
| Input cable (test probe 1 m) | CC010001 |
| Alligator clip adapter (for CC010001) | CC015001 |
|
Internal temperature detecting sensor (JPt100) |
1104-010 |
| Sheath-type platinum resistance bulb (JPt100, Sheath outer diameter: φ3.2 mm) | 1104-001 |
|
Sheath-type platinum resistance bulb (JPt100, Sheath outer diameter: φ1.2 mm) |
1104-002 |
| Surface temperature detecting sensor (JPt100) | 1108-010 |
| Panel mount set (2U half) | A02039 |
| Panel mount set (2U half twin) | A02040 |
| Rack mount set (JIS 2U half) | A02263 |
| Rack mount set (JIS 2U half twin) | A02264 |
| Rack mount set (EIA 2U half) | A02463 |
| Rack mount set (EIA 2U half twin) | A02464 |
Download
Functions: (1) Obtains measued values the specified number of times at a specified interval (2) Sends remote commands
*Go to the download page.
Functions: Measures temperature the specified number of times at a specified interval with a PT resistor temperature sensor connected
*Go to the download page.
Function: Multi-channel measurement using the scanner 3100, capable of meausirng DCV and 2-wire resistnace by sequential scan of up to 40 channels and 4-wire resistance by that of up to 20 channels.
*Go to the download page.
