The SigOFIT Gen 3 MOIP350P fiber-optic-isolated probe enables the measurement of low and high voltages with a bandwidth of 200 MHz and a common-mode level of up to 85 kVpk. Thanks to Micsig’s exclusive SigOFIT™ optical isolation technology, the SigOFIT probe is laser-driven and delivers extremely high common-mode rejection ratio (CMRR) and isolation voltage. Unlike conventional differential probes, which can measure only high-voltage signals, the SigOFIT probe enables the measurement of differential signals in voltage ranges from ±0.01 V to ±20 kV. This achieves a full measurement range and a very high signal-to-noise ratio. Third-generation semiconductor devices, such as SiC and GaN, are capable of switching high voltages in a matter of nanoseconds. This generates high-energy, high-frequency harmonics.
The use of high-quality coaxial attenuation tips and industry-standard MCX and MMCX connectors perfectly suppresses the oscillations in the SigOFIT probes caused by high-frequency common-mode noise. Unlike previous-generation probes, the SigOFIT Gen 3 series enables calibration-free measurements and requires no automatic zero adjustment. This reduces setup time and allows engineers to begin measurements immediately, while maintaining excellent accuracy and long-term stability. In addition, the MOIP200P probe features a very low input impedance of < 3 pF, a very high common-mode rejection ratio of up to 122 dB, and a highly accurate DC gain of 1%.
| Specification | MOIP1000P not yet available | MOIP500P not yet available | MOIP350P | MOIP200P |
|---|---|---|---|---|
| Bandwidth | 1 GHz | 500 MHz | 350 MHz | 200 MHz |
| Rise time | ≤ 450 ps | ≤ 800 ps | ≤ 1 ns | ≤ 1.75 ns |
| CMRR | DC: 180 dB; 1 GHz: 108 dB | DC: 180 dB; 500 MHz: 114 dB | DC: 180 dB; 350 MHz: 118 dB | DC: 180 dB; 200 MHz: 122 dB |
| Differential Voltage Range | Standard: OP50 (MMCX), ±25 V OP5000 (MCX), ±2500 V Other test ranges customizable. | Standard: OP50 (MMCX), ±25 V OP5000 (MCX), ±2500 V Other test ranges customizable. | Standard: OP50 (MMCX), ±25 V OP5000 (MCX), ±2500 V Other test ranges customizable. | Standard: OP50 (MMCX), ±25 V Other test ranges customizable. |
| Noise | <0.3 mVrms | <0.3 mVrms | <0.3 mVrms | <0.3 mVrms |
| DC Gain Accuracy | 1% | 1% | 1% | 1% |
| Common Mode Voltage Range | 85 kVpk | 85 kVpk | 85 kVpk | 85 kVpk |
| Power Supply | DC 12 V | DC 12 V | DC 12 V | DC 12 V |
| Fiber cable length | 2 m (Customizable) | 2 m (Customizable) | 2 m (Customizable) | 2 m (Customizable) |
| Interface | Universal BNC | Universal BNC | Universal BNC | Universal BNC |
You can find all technical data here
The combination of probe and attenuation tip determines the probe's technical specifications. To find the right tip for your intended application, it is important to correctly determine the key parameters: differential voltage range, maximum input voltage, and input resistance. If you are unsure, we recommend contacting our technical support team.
| Attenuator Model | Jack type | Attenuation ratio | Voltage range | Non-destructive voltage (max.) | Input impedance |
|---|---|---|---|---|---|
| OP20-3 | MMCX | 20:1 @ 0 dB 2:1 @ 20 dB | ±10 V ±1 V | 1000 Vpk | 4.47 MΩ || ≤ 4 pF |
| OP50-3 | MMCX | 50:1 @ 0 dB 5:1 @ 20 dB | ±25 V ±2.5 V | 1000 Vpk | 4.19 MΩ || ≤ 2 pF |
| OP100-3 | MMCX | 100:1 @ 0 dB 10:1 @ 20 dB | ±50 V ±5 V | 1000 Vpk | 4.10 MΩ || ≤ 2 pF |
| OP200-3 | MCX | 200:1 @ 0 dB 20:1 @ 20 dB | ±100 V ±10 V | 2500 Vpk | 8 MΩ || ≤ 1 pF |
| OP500-3 | MCX | 500:1 @ 0 dB 50:1 @ 20 dB | ±250 V ±25 V | 2500 Vpk | 5 MΩ || ≤ 1 pF |
| OP1000-3 | MCX | 1000:1 @ 0 dB 100:1 @ 20 dB | ±500 V ±50 V | 2500 Vpk | 20.94 MΩ || ≤ 1 pF |
| OP2000-3 | MCX | 2000:1 @ 0 dB 200:1 @ 20 dB | ±1000 V ±100 V | 2500 Vpk | 20.52 MΩ || ≤ 1 pF |
| OP5000-3 | MCX | 5000:1 @ 0 dB 500:1 @ 20 dB | ±2500 V ±250 V | 2500 Vpk | 40.82 MΩ || ≤ 1 pF |
| OP10000-3 | LCX | 10000:1 @ 0 dB 1000:1 @ 20 dB | ±5000 V ±500 V | 8000 Vpk | 40.82 MΩ || ≤ 1 pF |
SiC & GaN device can switch high voltages in a few nanoseconds, the signal may have high-energy high-frequency harmonics. Even at the highest bandwidth, the SigOFIT probe still have nearly 100dB CMRR, perfectly suppressed the oscillation caused by high-frequency common-mode noise, no redundant components. It's the best choice for 3rd-gen semiconductor test & measurement.
The test leads of SigOFIT probe are short and with coaxial cable transmission, has less than 2.5pF input capacitance, very safe to test GaN.
Language: English
File Size: 4.88 MiB
Release Date: 13.07.2026
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File Size: 1.15 MiB
Release Date: 07.07.2026
Language: English
File Size: 713.47 KiB
Release Date: 12.05.2026