720256 4-Channel High-Resolution Isolation Module
The Yokogawa 720256-4 is a 4-channel High-Resolution Isolation Module that is capable of 3 MHz of bandwidth at an ultra high 16-bit resolution and ±0.25% accuracy with isolated BNC inputs.
With a sampling rate of 10 MS/s, high noise immunity, low noise, and the ability to deliver 600 V isolated measurements (powered by Yokogawa’s IsoPRO™ isolation technology), the 720256-4 combines accuracy, reliability, and safety in one compact design.
This module is ideal for testing and long-term monitoring for power generators and multi-output power supplies.
Key Features
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Ultra High Resolution: 10 MS/s sampling with 16-bit resolution delivers accurate waveform capture for high-frequency, high-voltage applications
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Optically Isolated Channels: Each input channel is optically isolated, providing robust protection against ground loops and common-mode interference while maintaining accurate differential measurements even in high-voltage systems. Using high-speed optical fiber-based transmission, IsoPROTM technology enables 600 V isolated measurements*.
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Consistent Signal Integrity: Maintains low noise and high accuracy across a wide measurement bandwidth
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Seamless System Integration: Fully compatible with Yokogawa’s ScopeCorder (DL950) and High-Speed DAQ (SL2000) platforms, the 720256-4 extends system capability without adding setup complexity
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Testing and Longterm Monitoring: Ideal for power generators and multi-output power supplies. Also provides dynamic analysis of multi-channel data recording applications.
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| Standard operating conditions | Temperature: 23 ±5 °C Humidity: 20 to 80 % RH After a 30 minute warm-up and after calibration |
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| Effective measurement range | 20 div (display range: 10 div) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of input channels | 4 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Input coupling settings | AC, DC, GND | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum sample rate | 10 MS/s | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Input type | Isolated unbalanced | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Frequency characteristics1 (−3 dB point when a sine wave of amplitude ±3 div is applied) | DC to 3 MHz | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Voltage scale setting | 5 mV/div to 20 V/div (1-2-5 steps) (when using 1:1 probe factor) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum input voltage (at a frequency of 1 kHz or less) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Combined with the 700929 (10:1), 702902 (10:1), or 701947 (100:1)2 | 600 V (DC+ACpeak) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Combined with the 701901 + 701954 (1:1)4 | 200 V (DC+ACpeak) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Direct input (cable that does not comply with the safety standards)6 | 42 V (DC+ACpeak) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum rated voltage to ground – between input and case and between inputs (at a frequency of 1 kHz or less) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Safety standard’s working voltage | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Combined with 700929 (10:1), 702902 (10:1), 701947 (100:1)3 or combined with 701901 + 701954 (1:1)5 | 300 Vrms CAT II, 400 Vrms (measurement category Other (O), 1500 V transient overvoltage) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Direct input (cable that does not comply with the safety standards)7 | 42 V (DC+ACpeak) (CAT II, 30 Vrms) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Vertical (voltage) axis accuracy DC accuracy1 | ±(0.25% of 10 div) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Input connector | BNC connector (isolated type) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Input impedance | 1 MΩ ±1 %, approx. 32 pF | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| −3 dB point when AC coupled | 10 Hz or less (1 Hz or less when using the 700929 or 702902, 0.1 Hz or less when using the 701947) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Common mode rejection ratio | 80 dB (50/60 Hz) or more (typical value8) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Residual noise level (input section shorted) | ±0.05 div 5 mV/div to 20 mV/div (typical value8) ±0.025 div 50 mV/div to 20 V/div (typical value8) |
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| Withstand voltage | 2300 Vrms for 2 seconds (across each input terminal and earth) (60 Hz) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Insulation resistance | 500 VDC, 10 MΩ or more (across each input terminal and earth) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| A/D converter resolution | 16 bit (2400 LSB/div) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Temperature coefficient | Zero point: ±0.02 % of 10 div/°C 50 mV/div to 20 V/div (typical value8) ±0.10 % of 10 div/°C 5 mV/div to 20 mV/div (typical value8) Gain: ±0.02%/°C (typical value8) |
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| Bandwidth limit | Analog filter: Select from Full and 400 kHz Cutoff characteristics: −18 dB/OCT (typical value8) Digital filter: Cutoff frequency: AUTO, 128 kHz, 64 kHz, 32 kHz, 16 kHz, 8 kHz, 4 kHz, 2 kHz, 1 kHz, 500 Hz, 250 Hz, 125 Hz, 62.5 Hz Filter format: IIR (except AUTO) Cutoff frequency (fc) when set to AUTO
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| Probe attenuation settings | Voltage probe: 1:1, 2:1, 5:1, 10:1, 20:1, 50:1, 100:1, 200:1, 500:1, 1000:1, 2000:1, 5000:1, 10 k:1, 20 k:1, 50 k:1 Current probe: 0.1 A:1 V, 0.2 A:1 V, 0.5 A:1 V, 1 A:1 V, 2 A:1 V, 5 A:1 V, 10 A:1 V, 20 A:1 V, 50 A:1 V, 100 A:1 V, 200 A:1 V, 250 A:1 V, 400 A:1 V, 500 A:1 V, 1 kA:1 V, 2 kA:1 V, 5 kA:1 V, 10 kA:1 V, 20 kA:1 V, 50 kA:1 V |
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| Cutoff frequency characteristics of the anti-aliasing filter (AAF) | When the filter is set to AUTO, the anti-aliasing filter (AAF) and low-pass filter are automatically set according to the sample rate.
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| Wiring / measurement points |
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1. Value measured under standard operating conditions.
8. Typical values represent typical or average values. They are not strictly warranted.
When AC coupled. DC components are not attenuated to 1/10 or 1/100 when the 700929, 702902, or 701947 is in use.
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Capture and analyze a wide variety of electromechanical signals and serial buses. High sample rate, long recording times, advanced triggers, and real-time analysis.