| Description/Model | 6415A (High Accuracy Type) | 6425A (High Voltage Type) |
| Digit | Decimal , 7dials | Decimal , 6dials |
| Resolution | 0.1ppm | 1ppm |
| Frequency Range | 50Hz to 10kHz | 40Hz to 1kHz |
| Ratio Accuracy | 0.5ppm(at 1kHz, referred to input) | 1ppm(at 60Hz, referred to input) |
| Maximum Input Voltage*1 | 0.35V rms/Hz | 5.0V rms/Hz |
| Input Impedance | Above 100kΩ(at 1kHz) | Above 50kΩ(at 60kHz) |
| Output Impedance | Below 5Ω | Below 20Ω |
| Output Current | 1A max | 1A max |
| Dimensions(W/H/D) | 450 / 130 / 240 (mm) | 450 / 130 / 400 (mm) |
*1 Voltage 350 V rms MAX