How to choose the right voltage, current, polarity, accuracy, and control configuration
Choosing a laboratory high-voltage power supply involves more than selecting the highest voltage available. The right LabMate depends on five practical questions:
- What voltage range does the application require?
- How much output current can the load draw?
- Does the work require general-purpose or precision output?
- Should the high-voltage output be positive or negative relative to ground?
- Will the supply be operated only from its front panel, or integrated with an external control system?
This guide explains those choices and compares every current LabMate configuration.
Quick comparison
| Model | Adjustable output range | Maximum current | Output accuracy | Analog Remote I/O | Best fit |
|---|---|---|---|---|---|
| LabMate 10 | Separate 0 to +10 kV or 0 to −10 kV models | 2 mA | ±1% | Optional | General-purpose work that needs up to 10 kV and comparatively more current |
| LabMate 30 | Separate 0 to +30 kV or 0 to −30 kV models | 0.4 mA | ±1% | Optional | General-purpose work that requires more than 10 kV but has a lower current requirement |
| LabMate Precision 30 | Separate 0 to +30 kV or 0 to −30 kV models | 1 mA | ±0.1% | Standard | Accuracy-, ripple-, and stability-sensitive work up to 30 kV |
Important: Positive and negative LabMate supplies are separate, fixed-polarity models. They are not bipolar supplies and are not field-switchable.
Step 1: Choose the voltage and current range
Begin with the voltage required at the high-voltage electrode, then confirm the expected load current. Both ratings matter.
Choose LabMate 10 when the application stays at or below 10 kV
LabMate 10 provides adjustable, regulated output from zero to 10 kV at up to 2 mA. It is the practical general-purpose choice for electrospinning and electrospraying at moderate voltage, electrostatic and ionization experiments, detector or electrode biasing, component testing, and educational or development systems where 10 kV is sufficient.
Its 2 mA maximum current also makes it the higher-current option among the two general-purpose LabMate models. If the experiment needs no more than 10 kV but may draw more than 0.4 mA, LabMate 10 is generally the better starting point than LabMate 30.
Choose LabMate 30 when the application requires more than 10 kV
LabMate 30 extends the adjustable output range to 30 kV at up to 0.4 mA. It is intended for higher-field experiments such as electrospinning processes that require a larger electrode gap or greater electric-field potential, as well as specialized electrostatic, plasma, ionization, insulation, and bias-voltage work.
LabMate 30 is a higher-voltage supply, not a higher-power version of LabMate 10. Its maximum current is 0.4 mA, compared with 2 mA for LabMate 10. Choose it because the application requires the additional voltage range, and verify that 0.4 mA is sufficient for the load.
Allow useful voltage headroom—but do not oversize without a reason
Determine the highest voltage your established protocol or proposed experiment is expected to use. Allow enough range for reasonable process adjustment, electrode spacing, material variation, and future development. A 30 kV model may be operated below 10 kV, but the additional capability should serve a real experimental need. Choosing the smaller suitable range can simplify the setup and gives access to LabMate 10’s higher current rating.
When estimating the load, include the experimental device, intentional resistors, leakage paths, measurement equipment, and normal process current. Arcing and discharge events must be addressed by the complete system’s safety design; they should not be treated as normal steady-state load current.
Step 2: Decide whether general-purpose or precision output is required
LabMate 10 and LabMate 30 are general-purpose laboratory supplies with ±1% output accuracy. They are well suited to development, routine experiments, teaching, electrostatic work, and many electrospinning or electrospraying processes where a stable, adjustable high-voltage source is required but sub-percent accuracy is not the central measurement need.
LabMate Precision 30 provides adjustable output to 30 kV, up to 1 mA, and ±0.1% output accuracy. It is designed for work in which output accuracy, low ripple, stability, repeatability, or quantitative comparison between runs is especially important. Analog Remote I/O is included as standard.
Choose LabMate Precision 30 when the uncertainty or variation of the high-voltage source could materially affect the experiment, measurement, calibration, or process result. Choose the general-purpose model when ±1% accuracy is appropriate and the voltage/current range is the more important criterion.
Step 3: Choose positive or negative polarity
Polarity describes the high-voltage output relative to ground:
- A positive model adjusts from 0 V toward its positive rated voltage.
- A negative model adjusts from 0 V toward its negative rated voltage.
Polarity should be chosen from the electrical configuration and process requirements—not from a general assumption that one polarity is universally better.
Start with the established protocol
If you are reproducing published work, following a validated process, or connecting to equipment with a defined bias requirement, use the specified polarity. Confirm which electrode is driven at high voltage and which point is grounded or used as the reference.
Consider the material and process physics
Many electrospinning and electrospraying arrangements can operate with either polarity after suitable adjustment, but the results are not necessarily identical. Solvent and solute chemistry, charge carriers, electrode reactions, corona behavior, ion mobility, collector configuration, and nearby grounded structures can all make polarity significant.
Detector, ionization, plasma, and charged-particle systems commonly have a required electric-field direction or electrode-bias convention. In those cases, the system design determines the correct polarity.
Confirm before ordering
LabMate positive and negative models are separate products. A positive unit cannot be switched in the field to negative output, and a negative unit cannot be switched to positive output. If your work genuinely requires both polarities, plan for two suitable supplies or contact Spruce Science to review the setup.
Step 4: Choose Local Control or Analog Remote I/O
LabMate 10 and LabMate 30 are available in two control configurations. LabMate Precision 30 includes Analog Remote I/O as standard.
Local Control
Choose Local Control when an operator will set and monitor the power supply directly at the instrument. The front panel provides:
- Independent voltage and current-limit adjustment
- Turns-counting controls for fine adjustment
- Separate five-digit voltage and current displays
- High-voltage On/Off control
- Constant-current-mode indication
Local Control is the simplest choice for standalone benchtop experiments, manually adjusted setups, and applications that do not need external programming or monitoring.
Analog Remote I/O
Choose Analog Remote when the supply will be integrated into experimental equipment, a test station, a process controller, or a data-acquisition system. The interface supports:
- External voltage programming
- External current-limit programming
- Voltage and current monitor outputs
- Remote-mode selection
- High-voltage enable control
The Analog Remote configuration retains front-panel operation; it does not turn LabMate into a remote-only instrument. This makes it useful for both manual development and later system integration.
The interface uses 0–10 V analog control and monitor signals through a Micro HDMI Type-D receptacle. The connector is used as a compact physical interface only—it is not an HDMI audio/video connection, USB interface, Ethernet connection, or digital communications port. Connecting it to a computer requires suitable analog I/O or data-acquisition hardware.
Analog Remote models include an HDMI-A-to-Micro-HDMI-D cable and an HDMI breakout board for access to the interface signals. Because the two connector types use different pin numbering, use the supplied wiring chart rather than assuming that equally numbered pins connect to one another.
All current LabMate configurations
LabMate 10
| Configuration | Output | Control | Product page |
|---|---|---|---|
| LabMate 10 Positive — Local Control | 0 to +10 kV, 2 mA, ±1% | Front panel | View product |
| LabMate 10 Positive — Analog Remote | 0 to +10 kV, 2 mA, ±1% | Front panel + Analog Remote I/O | View product |
| LabMate 10 Negative — Local Control | 0 to −10 kV, 2 mA, ±1% | Front panel | View product |
| LabMate 10 Negative — Analog Remote | 0 to −10 kV, 2 mA, ±1% | Front panel + Analog Remote I/O | View product |
Compare all LabMate 10 configurations
LabMate 30
| Configuration | Output | Control | Product page |
|---|---|---|---|
| LabMate 30 Positive — Local Control | 0 to +30 kV, 0.4 mA, ±1% | Front panel | View product |
| LabMate 30 Positive — Analog Remote | 0 to +30 kV, 0.4 mA, ±1% | Front panel + Analog Remote I/O | View product |
| LabMate 30 Negative — Local Control | 0 to −30 kV, 0.4 mA, ±1% | Front panel | View product |
| LabMate 30 Negative — Analog Remote | 0 to −30 kV, 0.4 mA, ±1% | Front panel + Analog Remote I/O | View product |
Compare all LabMate 30 configurations
LabMate Precision 30
| Configuration | Output | Control | Product page |
|---|---|---|---|
| LabMate Precision 30 Positive | 0 to +30 kV, 1 mA, ±0.1% | Front panel + Analog Remote I/O standard | View product |
| LabMate Precision 30 Negative | 0 to −30 kV, 1 mA, ±0.1% | Front panel + Analog Remote I/O standard | View product |
Compare LabMate Precision 30 models
Features shared across the LabMate family
Every current LabMate model is a compact, regulated laboratory high-voltage power supply with automatic constant-voltage and constant-current crossover. The supply maintains the selected voltage while the load remains below the current limit. If the load reaches the selected limit, current regulation takes control and the output voltage adjusts in response to the load.
Current limiting is an operating function, not a substitute for grounding, guarding, interlocks, discharge provisions, or other high-voltage safeguards.
Each LabMate also includes:
- Separate live voltage and current displays
- Independent voltage and current-limit controls
- A 24 VDC power input and supplied AC-to-DC adapter
- An M5 threaded earth-ground stud
- A shielded, quick-disconnect high-voltage connector system
- A two-foot user-side high-voltage cable assembly
- A 47 kΩ series resistor in the user-side cable to help limit surge current during unexpected arcing events
The high-voltage connection uses a coaxial structure with a central high-voltage conductor and a grounded outer shield. This arrangement helps reduce capacitive coupling and electrical noise while adding a grounded barrier around the high-voltage path.
A practical selection checklist
Before choosing a configuration, write down the following requirements:
- Normal operating voltage: What voltage does the protocol or design actually use?
- Maximum required voltage: Is 10 kV sufficient, or is operation above 10 kV expected?
- Expected load current: Does the load fit within 2 mA for LabMate 10, 0.4 mA for LabMate 30, or 1 mA for LabMate Precision 30?
- Accuracy requirement: Is ±1% suitable, or does the work justify ±0.1% accuracy and precision-series output quality?
- Polarity: Is the driven electrode required to be positive or negative relative to ground?
- Control method: Will operation remain manual, or will the supply need external programming, monitoring, or high-voltage enable control?
- System integration: Are grounding, guarding, interlocks, clearances, discharge paths, and measurement equipment suitable for the chosen voltage?
Common selection examples
- A manually adjusted electrospinning setup operating below +10 kV: LabMate 10 Positive — Local Control is the natural starting point, provided 2 mA is sufficient.
- A 20 kV electrostatic experiment with low steady-state current: Choose the appropriate-polarity LabMate 30, then select Local Control or Analog Remote based on the integration requirement.
- A repeatability-sensitive 30 kV measurement system: LabMate Precision 30 provides ±0.1% accuracy, up to 1 mA, and Analog Remote I/O as standard.
- An automated test station operating to −10 kV: LabMate 10 Negative — Analog Remote provides fixed negative output together with external programming, monitoring, and enable control.
- An application needing 10 kV and more than 0.4 mA: LabMate 10 may be a better fit than LabMate 30 because its current rating is 2 mA, provided no operation above 10 kV is required.
Still deciding?
If the required voltage, current, polarity, or control method is uncertain, send Spruce Science a brief description of the application, including the intended voltage range, expected current, electrode configuration, grounding arrangement, and whether external control is needed. We can help identify the closest LabMate configuration before you order.
High-voltage safety
LabMate power supplies produce hazardous high voltage and can store dangerous energy. Contact with the high-voltage output may cause serious or fatal injury. Use the equipment only through trained, qualified personnel and within an appropriately designed, grounded, guarded, and interlocked system. De-energize the supply, verify zero output, and discharge stored energy before making or changing connections. Follow the product manual and your organization’s electrical-safety procedures.