| AC and DC Voltage Measurement TRMS | |
| Range | 500 V |
| Resolution | 0.1 V |
| Accuracy 45 to 66 Hz | 0.8% + 3 |
| Input Impedance | 3.3 MΩ |
| Overload Protection | 660 V rms |
| Continuity Testing (RLO) | |
| Range (Autoranging) | 20/200/2000 Ω |
| Resolution | 0.01/0.1/1 Ω |
| Open Circuit Voltage | >4V |
| Insulation Resistance Measurement (RISO) | |
| Test Voltages | 50-100-250-500-1000 V |
| Accuracy of tTest voltage (at rated test current) | +10%, -0% |
| 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 0.01/0.1/1 MΩ |
| Test Current | 1mA at 50 kω 1mA at 100 kω 1mA at 250 kω 1mA at 500 kω 1 mA at 1 Mω |
| Loop and Line Impedance (ZI) | |
| Range | 10 ω/0.001 ω/ High current mω mode |
| Resolution | 0.01/0.1/1 ω |
| Prospective Earth Fault Current, PSC Test | |
| Range | 1000 A/ 10 kA (50 kA) |
| Resolution | 0.01/0.1/ 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 1664 | A, AC,B |
| Notes | ¹Responds to AC ²General, no delay ³Time delay 4Responds to pulsed signal 5Responds to smooth DC signal |
| Tripping Speed Test (ΔT) | |
| Current Setting¹ | 10-30-100-300-500-1000 mA – VAR 10-30-100 mA |
| Multiplier | x½, x1, x5 |
| Measurement Range | RDC Type G: 310 ms, 50 ms RDC Type S: 510 ms, 160 ms |
| Notes | ¹1000 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 to 110% of RCD rated current¹ |
| Step Size | 10% 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% for Type AC 35 to 140% for Typer A (>10 mA) 35 to 200% for Type A (≤10 mA) 50 to 200% for Type B ²5% 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 |
| Earth Resistance Test (RE) | |
| Range | 200/2000 ω |
| Resolution | 0.1/1 ω |
| Frequency | 128 Hz |
| Output Voltage | 25 V |
| General Specifications | |
| Battery Size, Quantity | Type AA, 6 ea |
| Safety | Complies with EN61010-1 Ed 2.0 (2001-02), UL61010, ANSI/ISA –s82.02.01 2000 and CAN/CSA c22.2 No. 1010 2nd edition |
| Overvoltage | CAT III / 500V; CAT IV 300V |
| Performance | EN61557-1 to EN61557-7 Second Edition and EN61557-10 Second Edition |
| Dimensions | 3.94 x 9.84 x 4.92" (10 x 25 x 12.5 cm) |
| Weight | Including Batteries: 2.87 (1.3kg) |


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