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1. What all IsoBlock sensors share
Every IsoBlock voltage sensor uses the same isolation architecture: the input signal is amplified, modulated into a magnetic field, transferred across a galvanic barrier, demodulated, and output as a ±10 V differential pair. This gives every IsoBlock these shared characteristics:
- Galvanic isolation from input to output - the measurement source is electrically separated from the DAQ
- DIN-rail mounting with spring cage connectors
- 100 kHz bandwidth (120 kHz on Q-4c)
- 0.2% accuracy (0.1% option on V-1c, V-4c, and V-3P)
- 112 dB CMR at 60 Hz (110 dB on Q-4c)
- Surge protection at every input channel
2. Key differentiators at a glance
| V-1c | V-4c | V-3P | Q-4c | |
|---|---|---|---|---|
| Channels | 1 | 4 | 4 (3-phase + N) | 4 |
| Input range | ±5 V to ±1.5 kV | ±10 mV to ±1.5 kV | 150 VAC to 1 kVAC | ±10 mV to ±2 V |
| Best accuracy | 0.1% | 0.1% | 0.1% | 0.2% |
| Isolation | ±1500 V 5 kV surge |
±1500 V 5 kV surge |
> ±1500 V 5 kV surge |
2500 V primary-secondary 1200 V ch-to-ch 4200 V surge ch-to-ch |
| Output | ±10 V diff. 7 VAC, ±5 V |
±10 V diff. (±5 V custom) |
7 VAC diff. | ±10 V diff. |
| Bandwidth | 100 kHz (500 kHz opt.) |
100 kHz | 100 kHz | 120 kHz |
| Power supply | 12-28 V | 12-28 V | 12-28 V | 8-28 V |
| Key differentiator | Smallest footprint, 500 kHz option, lowest power | 4 channels + millivolt ranges in one module | 3-phase + neutral in one module | High gain (up to 1000x), channel-to-channel isolation, quench-rated |
3. Selection guide
| Your measurement | Use this IsoBlock | Why |
|---|---|---|
| One isolated high-voltage channel, best accuracy | V-1c | 0.1% accuracy option, 500 kHz option, UL certified, lowest power (1.3 W) |
| Four isolated channels measuring different voltages | V-4c | 4 independent channels with own isolated references, includes millivolt ranges |
| Three-phase plus neutral voltage measurement | V-3P | Purpose-built for 3-phase. One module replaces four sensors. Delta/Wye configurable. |
| Millivolt signals with high gain and channel-to-channel isolation | Q-4c | Gain up to 1000x, 1200 V ch-to-ch isolation, quench-rated input protection |
| Superconducting magnet quench detection | Q-4c | Purpose-built for this. Time-of-flight quench location across cable segments. |
| Solar string monitoring or battery pack measurement | V-4c | 4 isolated channels, multiple voltage ranges, one DIN rail module |
| Grid power quality or motor drive measurement | V-3P | 3-phase + neutral, 7 VAC output, line-to-line and line-to-ground outputs |
| Signals above 100 kHz (up to 500 kHz) | V-1c | Only IsoBlock with 500 kHz bandwidth option |
4. Full comparison table
All values from Verivolt spec sheets. No estimates.
| Specification | IsoBlock V-1c | IsoBlock V-4c | IsoBlock V-3P | IsoBlock Q-4c |
|---|---|---|---|---|
| Channels | 1 | 4 | 4 (3-phase + N) | 4 |
| Accuracy | 0.2% std 0.1% opt. |
0.2% std 0.1% opt. |
0.2% std 0.1% opt. |
0.2% |
| Bandwidth | 100 kHz (500 kHz opt.) |
100 kHz | 100 kHz | 120 kHz |
| Input range | ±5 V to ±1.5 kV | ±10 mV to ±1.5 kV | 150 VAC to 1 kVAC | ±10 mV to ±2 V (5 gain settings) |
| Isolation primary-secondary | ±1500 V | ±1500 V | > ±1500 V | 2500 V |
| Common-mode surge | ±5000 V | ±5000 V | ±5000 V | 1500 V |
| Channel-to-channel isolation | N/A (1 ch) | Not specified | Not specified | 1200 V sustained 4200 V surge |
| CMR @ 60 Hz | 112 dB | 112 dB | 112 dB | 110 dB |
| Phase shift @ 60 Hz | < 0.05° | < 0.05° | < 0.05° | 0.10° |
| Input delay | 3.8 us | 5.7 us | 3.8 us | 5 us |
| Input impedance | 440 kOhm - 8 MOhm (range-dependent) |
440 kOhm - 8 MOhm (range-dependent) |
8 MOhm | > 10 MOhm |
| Output voltage | ±10 V, 7 VAC, ±5 V | ±10 V (±5 V custom) |
7 VAC | ±10 V |
| Output type | Differential pair | Differential pair | Differential pair | Differential pair |
| Non-linearity | < 0.04% | < 0.04% | < 0.04% | 80 ppm |
| Power supply | 12-28 V | 12-28 V | 12-28 V | 8-28 V |
| Gain temperature drift | ±50 ppm/°C | ±50 ppm/°C | ±50 ppm/°C | 65 ppm/°C |
| Certifications | UL 61010-1 UL 61010-2-030 |
UL 61010-1 UL 61010-2-030 |
CE | RoHS, CE |
5. IsoBlock V-1c - single-channel isolated voltage sensor
(500 kHz opt.)
16 standard input configurations from ±5 V to ±1.5 kV, plus custom. The only IsoBlock with a 500 kHz bandwidth option and a 7 VAC output option. Lowest power consumption at 1.3 W steady-state. Through delay: 3.8 us. UL 61010-1 and UL 61010-2-030 certified.
Smallest IsoBlock footprint. The 500 kHz bandwidth option and 7 VAC output make it the only IsoBlock that can go beyond 100 kHz and interface with AC-referenced DAQ inputs.
Single-point isolated voltage measurement where accuracy and phase shift matter. Power quality monitoring, EV battery cell testing, single-channel DAQ inputs. Use when you need one channel per measurement point rather than four in one module.
6. IsoBlock V-4c - four-channel isolated voltage sensor
Four independently isolated channels in one DIN-rail module. Each channel has its own isolated reference - four separate measurement sources at different potentials can be connected simultaneously. Includes millivolt input ranges (±10 mV, ±50 mV, ±100 mV, ±500 mV, ±2 V) that the V-1c does not offer. UL 61010-1 and UL 61010-2-030 certified.
Four isolated channels plus millivolt input ranges in one module. The V-4c is the only IsoBlock that can measure both millivolt-level signals and high-voltage signals (up to 1.5 kV) across four independently isolated channels.
Multi-channel isolated measurement. Solar string monitoring, battery pack voltage measurement, multi-channel power converter testing. Use when you need four isolated measurements on one DIN rail.
7. IsoBlock V-3P - three-phase plus neutral isolated voltage sensor
Purpose-built for three-phase systems. Four channels: three phases plus neutral. Outputs all line-to-line and line-to-ground signal pairs. Supports Delta and Wye configurations depending on the DAQ input type (NRSE or Differential). Input ranges: 150 VAC, 250 VAC, 500 VAC, 700 VAC, 1000 VAC. One V-3P replaces four differential sensors. 112 dB CMR at 60 Hz.
Only IsoBlock designed for three-phase plus neutral. One module replaces four separate sensors. The 7 VAC output is specifically scaled for AC measurement, matching the VAC input ranges directly.
Three-phase power monitoring, grid-tied inverter testing, motor drive input/output measurement, utility power quality analysis. Any application where you need all three phases plus neutral measured with galvanic isolation in one module.
8. IsoBlock Q-4c - isolated signal amplifier for millivolt measurement
4200 V surge
Designed for quench detection and location in superconducting magnets. Measures millivolt-level differential voltages with selectable gain (5x to 1000x) across four channels. Each channel is galvanically isolated from the others and from ground: 1200 V sustained and 4200 V surge channel-to-channel isolation. The input protection stage survives voltage spikes from magnet energy extraction.
Two gain configurations available: High-Gain (10 mV, 40 mV, 150 mV, 500 mV, 2 V) and Low-Gain (1 V, 2 V, 5 V, 10 V, 20 V). Gain is selected per channel via jumper headers. 2500 V primary-to-secondary isolation. Input impedance: > 10 MOhm. Non-linearity: 80 ppm. RoHS compliant and CE certified.
Channel-to-channel isolation (1200 V sustained, 4200 V surge) - no other IsoBlock offers this. High gain up to 1000x for millivolt signals. The Q-4c is the only IsoBlock built for applications where each channel must be isolated from every other channel, not just from the DAQ ground.
Superconducting magnet quench detection and location. Any application requiring galvanically isolated millivolt measurement with channel-to-channel isolation: big physics experiments, magnet testing, coil voltage monitoring. Also used as a general-purpose isolated signal amplifier when high gain is needed.
- Verivolt brochure: verivolt.com/downloads/verivolt-brochure.pdf
- IsoBlock V-1c spec sheet (PDF)
- IsoBlock V-4c spec sheet (PDF)
- IsoBlock V-3P spec sheet (PDF)
- IsoBlock Q-4c spec sheet (PDF)
Jump to
1. What all IsoBlock sensors share
Every IsoBlock voltage sensor uses the same isolation architecture: the input signal is amplified, modulated into a magnetic field, transferred across a galvanic barrier, demodulated, and output as a ±10 V differential pair. This gives every IsoBlock these shared characteristics:
- Galvanic isolation from input to output - the measurement source is electrically separated from the DAQ
- DIN-rail mounting with spring cage connectors
- 100 kHz bandwidth (120 kHz on Q-4c)
- 0.2% accuracy (0.1% option on V-1c, V-4c, and V-3P)
- 112 dB CMR at 60 Hz (110 dB on Q-4c)
- Surge protection at every input channel
2. Key differentiators at a glance
| V-1c | V-4c | V-3P | Q-4c | |
|---|---|---|---|---|
| Channels | 1 | 4 | 4 (3-phase + N) | 4 |
| Input range | ±5 V to ±1.5 kV | ±10 mV to ±1.5 kV | 150 VAC to 1 kVAC | ±10 mV to ±2 V |
| Best accuracy | 0.1% | 0.1% | 0.1% | 0.2% |
| Isolation | ±1500 V 5 kV surge |
±1500 V 5 kV surge |
> ±1500 V 5 kV surge |
2500 V primary-secondary 1200 V ch-to-ch 4200 V surge ch-to-ch |
| Output | ±10 V diff. 7 VAC, ±5 V |
±10 V diff. (±5 V custom) |
7 VAC diff. | ±10 V diff. |
| Bandwidth | 100 kHz (500 kHz opt.) |
100 kHz | 100 kHz | 120 kHz |
| Power supply | 12-28 V | 12-28 V | 12-28 V | 8-28 V |
| Key differentiator | Smallest footprint, 500 kHz option, lowest power | 4 channels + millivolt ranges in one module | 3-phase + neutral in one module | High gain (up to 1000x), channel-to-channel isolation, quench-rated |
3. Selection guide
| Your measurement | Use this IsoBlock | Why |
|---|---|---|
| One isolated high-voltage channel, best accuracy | V-1c | 0.1% accuracy option, 500 kHz option, UL certified, lowest power (1.3 W) |
| Four isolated channels measuring different voltages | V-4c | 4 independent channels with own isolated references, includes millivolt ranges |
| Three-phase plus neutral voltage measurement | V-3P | Purpose-built for 3-phase. One module replaces four sensors. Delta/Wye configurable. |
| Millivolt signals with high gain and channel-to-channel isolation | Q-4c | Gain up to 1000x, 1200 V ch-to-ch isolation, quench-rated input protection |
| Superconducting magnet quench detection | Q-4c | Purpose-built for this. Time-of-flight quench location across cable segments. |
| Solar string monitoring or battery pack measurement | V-4c | 4 isolated channels, multiple voltage ranges, one DIN rail module |
| Grid power quality or motor drive measurement | V-3P | 3-phase + neutral, 7 VAC output, line-to-line and line-to-ground outputs |
| Signals above 100 kHz (up to 500 kHz) | V-1c | Only IsoBlock with 500 kHz bandwidth option |
4. Full comparison table
All values from Verivolt spec sheets. No estimates.
| Specification | IsoBlock V-1c | IsoBlock V-4c | IsoBlock V-3P | IsoBlock Q-4c |
|---|---|---|---|---|
| Channels | 1 | 4 | 4 (3-phase + N) | 4 |
| Accuracy | 0.2% std 0.1% opt. |
0.2% std 0.1% opt. |
0.2% std 0.1% opt. |
0.2% |
| Bandwidth | 100 kHz (500 kHz opt.) |
100 kHz | 100 kHz | 120 kHz |
| Input range | ±5 V to ±1.5 kV | ±10 mV to ±1.5 kV | 150 VAC to 1 kVAC | ±10 mV to ±2 V (5 gain settings) |
| Isolation primary-secondary | ±1500 V | ±1500 V | > ±1500 V | 2500 V |
| Common-mode surge | ±5000 V | ±5000 V | ±5000 V | 1500 V |
| Channel-to-channel isolation | N/A (1 ch) | Not specified | Not specified | 1200 V sustained 4200 V surge |
| CMR @ 60 Hz | 112 dB | 112 dB | 112 dB | 110 dB |
| Phase shift @ 60 Hz | < 0.05° | < 0.05° | < 0.05° | 0.10° |
| Input delay | 3.8 us | 5.7 us | 3.8 us | 5 us |
| Input impedance | 440 kOhm - 8 MOhm (range-dependent) |
440 kOhm - 8 MOhm (range-dependent) |
8 MOhm | > 10 MOhm |
| Output voltage | ±10 V, 7 VAC, ±5 V | ±10 V (±5 V custom) |
7 VAC | ±10 V |
| Output type | Differential pair | Differential pair | Differential pair | Differential pair |
| Non-linearity | < 0.04% | < 0.04% | < 0.04% | 80 ppm |
| Power supply | 12-28 V | 12-28 V | 12-28 V | 8-28 V |
| Gain temperature drift | ±50 ppm/°C | ±50 ppm/°C | ±50 ppm/°C | 65 ppm/°C |
| Certifications | UL 61010-1 UL 61010-2-030 |
UL 61010-1 UL 61010-2-030 |
CE | RoHS, CE |
5. IsoBlock V-1c - single-channel isolated voltage sensor
(500 kHz opt.)
16 standard input configurations from ±5 V to ±1.5 kV, plus custom. The only IsoBlock with a 500 kHz bandwidth option and a 7 VAC output option. Lowest power consumption at 1.3 W steady-state. Through delay: 3.8 us. UL 61010-1 and UL 61010-2-030 certified.
Smallest IsoBlock footprint. The 500 kHz bandwidth option and 7 VAC output make it the only IsoBlock that can go beyond 100 kHz and interface with AC-referenced DAQ inputs.
Single-point isolated voltage measurement where accuracy and phase shift matter. Power quality monitoring, EV battery cell testing, single-channel DAQ inputs. Use when you need one channel per measurement point rather than four in one module.
6. IsoBlock V-4c - four-channel isolated voltage sensor
Four independently isolated channels in one DIN-rail module. Each channel has its own isolated reference - four separate measurement sources at different potentials can be connected simultaneously. Includes millivolt input ranges (±10 mV, ±50 mV, ±100 mV, ±500 mV, ±2 V) that the V-1c does not offer. UL 61010-1 and UL 61010-2-030 certified.
Four isolated channels plus millivolt input ranges in one module. The V-4c is the only IsoBlock that can measure both millivolt-level signals and high-voltage signals (up to 1.5 kV) across four independently isolated channels.
Multi-channel isolated measurement. Solar string monitoring, battery pack voltage measurement, multi-channel power converter testing. Use when you need four isolated measurements on one DIN rail.
7. IsoBlock V-3P - three-phase plus neutral isolated voltage sensor
Purpose-built for three-phase systems. Four channels: three phases plus neutral. Outputs all line-to-line and line-to-ground signal pairs. Supports Delta and Wye configurations depending on the DAQ input type (NRSE or Differential). Input ranges: 150 VAC, 250 VAC, 500 VAC, 700 VAC, 1000 VAC. One V-3P replaces four differential sensors. 112 dB CMR at 60 Hz.
Only IsoBlock designed for three-phase plus neutral. One module replaces four separate sensors. The 7 VAC output is specifically scaled for AC measurement, matching the VAC input ranges directly.
Three-phase power monitoring, grid-tied inverter testing, motor drive input/output measurement, utility power quality analysis. Any application where you need all three phases plus neutral measured with galvanic isolation in one module.
8. IsoBlock Q-4c - isolated signal amplifier for millivolt measurement
4200 V surge
Designed for quench detection and location in superconducting magnets. Measures millivolt-level differential voltages with selectable gain (5x to 1000x) across four channels. Each channel is galvanically isolated from the others and from ground: 1200 V sustained and 4200 V surge channel-to-channel isolation. The input protection stage survives voltage spikes from magnet energy extraction.
Two gain configurations available: High-Gain (10 mV, 40 mV, 150 mV, 500 mV, 2 V) and Low-Gain (1 V, 2 V, 5 V, 10 V, 20 V). Gain is selected per channel via jumper headers. 2500 V primary-to-secondary isolation. Input impedance: > 10 MOhm. Non-linearity: 80 ppm. RoHS compliant and CE certified.
Channel-to-channel isolation (1200 V sustained, 4200 V surge) - no other IsoBlock offers this. High gain up to 1000x for millivolt signals. The Q-4c is the only IsoBlock built for applications where each channel must be isolated from every other channel, not just from the DAQ ground.
Superconducting magnet quench detection and location. Any application requiring galvanically isolated millivolt measurement with channel-to-channel isolation: big physics experiments, magnet testing, coil voltage monitoring. Also used as a general-purpose isolated signal amplifier when high gain is needed.
- Verivolt brochure: verivolt.com/downloads/verivolt-brochure.pdf
- IsoBlock V-1c spec sheet (PDF)
- IsoBlock V-4c spec sheet (PDF)
- IsoBlock V-3P spec sheet (PDF)
- IsoBlock Q-4c spec sheet (PDF)
