HVA 0.01 % Laboratory Standard
- STABILITY < 0.005 % / YEAR
- <0.01 % DC RATIO ACCURACY
- < 0.1 % AC RATIO ACCURACY
- LOW TEMPERATURE COEFFICIENT
The HVA ac/dc Voltage Divider is designed as a calibration standard for dc and ac voltages. The HVA is highly immune from changes in temperature and humidity. Its unique toroidal shielding renders proximity effects negligible. No appreciable capacitance is produced by the shield structure, and the unit is estimated to be at least 99.9 % resistive.
The resistors forming the core of the HVA are individually wound and characterized to assure the highest quality. Careful selection and processing of these resistors yields a ratio temperature coefficient of less than five ppm per degree C (<0.000 5 %).
The dc output impedance of the HVA is 1000 ohms (3000 for HVA-150); the ac output is matched for a one megohm (input impedance) thermal converter or other ac meter.
Standard models are listed, but custom or special ranges can be supplied. For example, a common optional configuration is a dual dc output of 1 V & 10 V. Extended range models (above 150 kV) can be manufactured by stacking two or more HVA dividers.
Every HVA is provided with ISO 17025 accredited, traceable calibration at both dc and 60 Hz.
A specially fitted shipping container is available, and is recommended for customers who will be regularly transporting their standard to other labs for recertification or use.
| Model | Max kV dc / ac | Resistance | Ratio |
| HVA-50 | 50 dc / 35 ac | 50 Megohm | 50,000 : 1 |
| HVA-100 | 100 dc / 70 ac | 100 Megohm | 100,000 : 1 |
| HVA-150 | 150 dc / 100 ac | 300 Megohm | 100,000 : 1 |
| For special values, use the below format | |||
| Model | Input | Output 1 | Output 2 |
| HVA-(A)-)B)-(C) | (A) | (B) | (C) |
To order the Transit Container, please specify: HVA-CASE
Physical
- HVA-50 & 100: 24"x24"x28" (61x61x71cm) 45# (22 kG)
- HVA-150: 24"x24"x32" (61x61x81cm) 50# (25 kG)
