Specifications
| AC voltage measurement | ||
| Range | 500 V | |
| Resolution | 0.1 V | |
| Accuracy 45 Hz – 66 Hz | 0.8% + 3 | |
| Input impedance | 360 kΩ | |
| Overload protection | 660 V rms | |
| Continuity testing (RLO) | ||
| Range (autoranging) | 20 Ω / 200 Ω / 2000 Ω | |
| Resolution | 0.01 Ω / 0.1 Ω / 1 Ω | |
| Open Circuit Voltage | >4 V | |
| Insulation resistance measurement (RISO) | ||
| Test voltages | 50-100-250-500-1000 V | |
| Accuracy of test voltage (at rated test current) | +10%, -0% | |
| Test voltage | 50 V 100 V 250 V 500 V 1000 V | |
| Insulation resistance range | 20 MΩ / 50 MΩ 20 MΩ / 100 MΩ 20 MΩ / 200 MΩ 20 MΩ / 200 MΩ / 500 MΩ 20 MΩ / 200 MΩ / 1000 MΩ | |
| Resolution | 0.01 MΩ / 0.1 MΩ 0.01 MΩ / 0.1 MΩ 0.01 MΩ / 0.1 MΩ 0.01 MΩ / 0.1 MΩ / 1 MΩ 0.01 MΩ / 0.1 MΩ / 1 MΩ | |
| Test current | 1 mA @ 50 kΩ 1 mA @ 100 kΩ 1 mA @ 250 kΩ 1 mA @ 500 kΩ 1 mA @ 1 MΩ | |
| Loop and line impedance (ZI) | ||
| Range | 10 Ω (Hi current mΩ mode)/20 Ω/200 Ω/2000 Ω | |
| Resolution | 0.001 Ω/ 0.01 Ω/ 0.1 Ω/1 Ω | |
| Prospective earth fault current, PSC test | ||
| Range | 1000 A / 10 kA (50 kA) | |
| Resolution | 1 A / 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 | |
| Model 1664 FC | A, AC, B5, S | |
| Notes | ¹Responds to AC ²General, no delay ³Time delay ⁴Responds to pulsed signal ⁵Responds 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 VAR Mode Type B – 6, 60, 200 mA | |
| Measurement range | RCD Type G | 310 ms 50 ms |
| RCD Type S | 510 ms 160 ms | |
| EV / RDC-DD | 6 mA – 10s 60 mA – 0.3s 200 mA – 0.1s | |
| Notes | ¹1000 mA type AC only 700 mA maximum type A in VAR mode The VAR Mode at RCD type B (smooth DC currents) generates the test currents acc. to IEC 62955 for RCD type A-EV or RDC-DD (6/60/200 mA and ramp <2 to 6 mA). | |
| RCD/FI-Tripping Current Measurement/Ramp Test (IΔN) | ||
| Current range | 30% to 110% of RCD rated current¹ <2 mA to 6 mA smooth DC³ | |
| Step size | 10% of IΔN² Linear rising within 30 s | |
| Dwell time | RCD Type G | 300 ms/step |
| RCD Type S | 500 ms/step | |
| Measurement accuracy | ±5% | |
| Specified trip current ranges (EN 61008-1) | 50% to 100% for Type AC 35% to 140% for Type A (>10 mA) 35% to 200% for Type A (≤10 mA) 50% to 200% for Type B | |
| Notes | ¹30% to 150% for Type A IΔN > 10 mA 30% to 210% for Type A IΔN = 10 mA 20% to 210% for Type B ²5% for Type B ³For RCD type A-EV/RDC-DD acc. to IEC 62955 | |
| Earth Resistance Test (RE) | ||
| Range | 200 Ω / 2000 Ω | |
| Resolution | 0.1 Ω / 1Ω | |
| Frequency | 128 Hz | |
| Output Voltage | 25 V | |
| Phase Sequence Indication | ||
| Icon |  Phase Sequence indicator is active. | |
| General Specifications | ||
| Size (L x W x H) | 10 x 25 x 12.5 cm | |
| Weight (incl. batteries) | 1.3 Kg | |
| Battery size, quantity | Type AA, 6 ea. | |
| Sealing | IP-40 | |
| Safety | Complies with EN/IEC 61010-1 and EN/IEC 61010-2-034 | |
| Overvoltage | CAT III / 500V; CAT IV 300V | |
| Performance | EN61557-1 to EN61557-7 and EN61557-10 | |
