701251 High-Resolution Isolation Module
The Yokogawa 701251 is a 2-channel High-Resolution Isolation Module that is capable of 300 kHz of bandwidth at an ultra high 16-bit resolution and ±0.25% accuracy.
Not only does the 701251 have a sampling rate of 1 MS/s, high noise immunity, and the ability to deliver 600 V isolated measurements (powered by Yokogawa’s IsoPRO™ isolation technology), but it also delivers high sensitivity (down to 1 mV/div) and adds low noise (100 µV) to customer signals.
Key Features
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Ultra High Resolution: 1 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 701251 extends system capability without adding setup complexity
| Item | Specifications |
|---|---|
| Standard operating conditions | Temperature: 23 ±5 °C Humidity: 20 to 80 % RH After a 30 minute warm-up and after calibration |
| Effective measurement range | 20 div (display range: 10 div) |
| Number of input channels | 2 |
| Input coupling settings | AC, DC, GND |
| Maximum sample rate | 1 MS/s |
| Input type | Isolated unbalanced |
| Frequency characteristics1 (−3 dB point when a sine wave of amplitude ±3 div is applied) | 5 mV/div to 20 V/div: DC to 300 kHz 2 mV/div, 1 mV/div: DC to 200 kHz |
| Voltage scale setting | 1 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 | 140 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 | 5 mV/div to 20 V/div: ±(0.25 % of 10 div) 2 mV/div: ±(0.3 % of 10 div) 1 mV/div: ±(0.5 % of 10 div) |
| Input connector | BNC connector (isolated type) |
| Input impedance | 1 MΩ ±1 %, approx. 35 pF |
| −3 dB point when AC coupled | 1 Hz or less (0.1 Hz or less when using the 700929 or 702902, 0.01 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) | ±100 µV or ±0.01 div whichever is greater (typical value8, 9) |
| 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 bits (2400 LSB/div) |
| Temperature coefficient | Zero point: 5 mV/div to 20 V/div: ±(0.02 % of 10 div)/°C (typical value8) 2 mV/div: ±(0.05 % of 10 div)/°C (typical value8) 1 mV/div: ±(0.10 % of 10 div)/°C (typical value8) Gain: 1 mV/div to 20 V/div: ±0.02%/°C (typical value8) |
| Bandwidth limit | Select from Full, 40 kHz, 4 kHz, 400 Hz Cutoff characteristics: –12 dB/OCT (typical value8) |
| 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 |
| 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.
9. Residual noise may include spike-like noise components.
What is an Analog Input Module?
How an analog input module works: Using analog input module circuits, sensors, and/or transmitters, analog input converts voltage into a digital value to store and process on a computer.