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Products
LN Series
Precision Unipolar and Reversible High Voltage Modules
LN001, LN2.5, LN005, LN010, LN015, LN020, LN030
Applications: mass spectrometers, electron microscopes, surface science instruments, nuclear instruments, photo multiplier tubes and micro-channel plates
- Unipolar and reversible versions available
- Exceptionally low levels of low frequency (LF) noise and drift
- High stability, low ripple, low microphony
- Low partial discharge
- Fast recovery from load transients
- Analogue or digital control options
- Differential analogue input
- Short circuit and flashover proof
- Positive, negative and remote reversible versions
- <10ppm/°C temperature co-efficient (tighter temp-co available upon request)
This range of precision high voltage modules has outputs that provide exceptionally low levels of noise, microphony and drift and is specifically designed for easy integration into systems requiring multiple high voltages. The modules are the ideal HV sources for mass-spectrometry, electron gun, ion gun, photomultiplier, nuclear and other applications.
All units are short circuit proof and use proprietary low noise techniques to achieve a very low ripple with negligible harmonics and exceptional low frequency noise performance. The units have a differential input to minimize coupling of noise. The power supplies are designed for reliability, building on the data gained from many years of field operation of LN predecessors.
Positive, negative, and electrically reversible outputs are available at voltages up to 30kV. The reversible unit has a solid-state switching mechanism that can change polarity at full output voltage whilst maintaining very low levels of noise and partial discharge during switching.
Standard units have a 1m low noise screened cable for the high voltage output, but other cable lengths are available. We manufacture customized versions of these units and would be pleased to discuss your application with you.
| Electrical Specification | |||||
|---|---|---|---|---|---|
| Unit Type | Max Output Voltage* | Output Current | LF Noise | Ripple at Full Load |
Temperature Coefficient (°C) |
| LN001xIP010 | 1kV | 5mA | <2ppm | <5ppm | <10ppm |
| LN2.5xIP010 | 2.5kV | 2mA | <2ppm | <5ppm | <10ppm |
| LN005xIP010 | 5kV | 1mA | <2ppm | <5ppm | <10ppm |
| LN010xIP010 | 10kV | 0.5mA | <2ppm | <5ppm | <10ppm |
| LN015xIP010 | 15kV | 0.33mA | <2ppm | <5ppm | <10ppm |
| LN020xIP010 | 20kV | 0.25mA | <2ppm | <5ppm | <10ppm |
| LN030xIP010 | 30kV | 0.166mA | <2ppm | <5ppm | <10ppm |
*Positive/negative or reversible depending on unit type
| Control and Monitoring | |
|---|---|
| Input | +24 volt dc ±5% <0.7A 0V input common to HV return and chassis
Max inrush <10A |
| Control of Output | 50mV to 5V for 1% to 100% ±2% Zin>100kΩ Internal or external potentiometer—see options |
| Voltage Monitor | 0V to +5V ±2% for 0% to 100% (Zout<1Ω Iout ≤2mA) |
| Current Monitor | 0V to +5V ±2% for 0% to 100%, Offset ±0.1% of FS (Zout=1R Iout ≤2mA) |
| Polarity Control | Low or <1V = -ve, >4.0V or OC =+ve |
| Inhibit | Low or <1V = Enabled >4.0V or OC = inhibited |
| Line Regulation | <10ppm over full input voltage range |
| Load Regulation | <10ppm for load changes from 10% to 100% load |
| Drift (after 1 hour warm up) | <10ppm per hour, <50ppm over an 8 hour period |
| Protection (all outputs) | Protected against intermittent arcing and continued short circuit to ground |
| Minimum Output Voltage | 1% of maximum for model. Output current is de-rated below 10% voltage |
Connections
HV Output
1m low noise shielded output cable.
Outer diameter: 6mm
Shield outer diameter: 4.4mm
Inner insulation diameter: 3.95mm
Control Input
Connector type: 15 way D-type male connector
| Pin Assignments | |
|---|---|
| 1 | +ve Control input |
| 2 | +5V Reference/Pot Wiper (if fitted) |
| 3 | Signal ground |
| 4 | Signal ground |
| 5 | 0V Power return |
| 6 | 0V Power return |
| 7 | 0V Power return |
| 8 | Polarity select i/p |
| 9 | -ve Control input |
| 10 | Current monitor o/p |
| 11 | Voltage monitor o/p |
| 12 | Inhibit |
| 13 | +24V dc input |
| 14 | +24V dc input |
| 15 | +24V dc input |
| Mechanical Specification Weight and Size |
|||
|---|---|---|---|
| Unit Type | Size (mm) | Weight (kg) | |
| Unipolar units | LN001xIP010 | 147 x 98 x 40 | 0.8 |
| LN2.5xIP010 | 147 x 98 x 40 | 0.8 | |
| LN005xIP010 | 147 x 98 x 40 | 1.0 | |
| LN010xIP010 | 200 x 98 x 40 | 1.2 | |
| LN015xIP010 | 200 x 98 x 40 | 1.7 | |
| LN020xIP010 | 210 x 120 x 55 | 1.7 | |
| LN030xIP010 | 210 x 120 x 55 | 1.7 | |
| Reversible Units | LN001RIP010 | 147 x 98 x 40 | 1.0 |
| LN2.5RIP010 | 147 x 98 x 40 | 1.0 | |
| LN005RIP010 | 147 x 98 x 40 | 1.2 | |
| LN010RIP010 | 195 x 140 x 48 | 1.5 | |
| LN015RIP010 | 240 x 165 x 52 | 3.5 | |
| LN020RIP010 | 240 x 165 x 52 | 3.5 | |
| LN030RIP010 | 240 x 165 x 52 | 3.5 | |
| Part Numbering | |||||
|---|---|---|---|---|---|
| Series | Voltage | Polarity | Options | Temp-Co (°C) | Lead Length (m) |
| LN | 001 kV 2.5 2.5kV 005 5kV 010 10kV 015 15kV 020 20kV |
R Reversible P Positive N Negative |
IP precision current monitor PR current monitor, pot & reference |
010 10ppm/°C | -1.0 1m -2.0 2m -3.0 3m |
Example: LN005RIP010-1.0 = 5kV reversible with current monitor, <10ppm/°C tempco with 1m output cable
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