| Battery Type | AA |
| AC Voltage Measurement |
| Range | 500 volt |
| Resolution | 0.1 volt |
| Accuracy 45-66 Hz | 0.8 percent + 3 |
| Input Impedance | 360 kΩ |
| Overload Protection | 660 volt RMS |
| Continuity Testing (RLO) |
| Range (Autoranging) | 20/200/2000 Ω |
| Resolution | 0.01/0.1/1 Ω |
| Open Circuit Voltage | >4 volt |
| Insulation Resistance Measurement (RISO) |
| Test Voltages | 50, 100, 250, 500, 1000 volt |
| The accuracy of Test Voltage (at rated test current) | +10 percent, -0 percent |
| Test Voltage | 50 volt 100 volt 250 volt 500 volt 1000 volt |
| Insulation resistance range | 20/50 MΩ 20/100 MΩ 20/200 MΩ 20/200/500 MΩ 20/200/1000 MΩ |
| Resolution | 0.01/0.1 MΩ 0.01/0.1 MΩ 0.01/0.1 MΩ 0.01/0.1/1 MΩ 0.01/0.1/1 MΩ |
| Test Current | 1 mA at 50 kΩ 1 mA at 100 kΩ 1 mA at 250 kΩ 1 mA at 500 kΩ 1 mA at 1 MΩ |
| Loop and Line Impedance (ZI) |
| Range | 10/0.001 Ω/High Current mΩ Mode |
| Resolution | 0.01/0.1/1 Ω |
| Prospective earth fault current, PSC test |
| Range | 1000 Amps/10 kA (50 kA) |
| Resolution | 1 Amps/0.1 kA |
| Computation | Prospective earth fault current (PEFC) or Prospective short circuit current (PSC) determined by dividing measured mains voltage by measured loop (L-PE) resistance or line (L-N) resistance, respectively. |
| RCD Testing, RCD Types Tested |
| RCD Type | AC¹ G²,S³ |
| Model 1663 | A4, AC¹, G²,S³ |
| Notes | Responds to AC General, no delay Time delay Responds to pulsed signal Responds to smooth DC signal |
| Tripping speed test (ΔT) |
| Current settings¹ | 10, 30, 100, 300, 500, 1000 mA – VAR 10-30-100 mA |
| Multiplier | x ½, x 1 x 5 |
| Measurement Range | RCD Type G | 310 ms 50 ms |
| RCD Type S | 510 ms 160 ms |
| Notes | 1000 mA Type AC only 700 mA maximum type A in VAR mode VAR mode not available for type B |
| RCD/FI-Tripping Current Measurement/Ramp Test (IΔN) |
| Current Range | 30 percent to 110 percent of RCD Rated Current |
| Step Size | 10 percent of IΔN² |
| Dwell Time | Type G | 300 ms/step |
| Type S | 500 ms/step |
| Measurement Accuracy | ±5% |
| Specified Trip Current Ranges (EN 61008-1) | 50 to 100 percent for Type AC 35 to 140 percent for Type A (>10 mA) 35 to 200 percent for Type A (≤10 mA) 50 to 200 percent for Type B |
| Notes | 30 to 150 percent for Type A IΔN > 10 mA 30 to 210 percent for Type A IΔN = 10 mA 20 to 210 percent for Type B |
| Earth Resistance Test (RE) |
| Range | 200/2000 Ω |
| Resolution | 0.1/1Ω |
| Frequency | 128 Hz |
| Output Voltage | 25 volt |
| Phase Sequence Indication |
| Icon | Phase Sequence Indicator is Active. |
| Size | 100 x 250 x 125 mm |
| Weight | 1.3 Kg |