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The BK Precision 8551 is a 350 W DC electronic load with rated voltage of 150 V and rated current of 60 A. The 8551 provides many features and capabilities typically found in performance instruments, at a value price.
| Model | 8550 | 8551 | |
| Input Ratings | |||
| Input voltage | 0 to 150 V | 0 to 150 V | |
Input current | Low | 0 to 3 A | 0 to 6 A |
| High | 0 to 30 A | 0 to 60 A | |
| Input power | 175 W | 350 W | |
| Minimum operating voltage | Low | 0.15 V at 3 A | 0.15 V at 6 A |
| High | 1.5 V at 30 A | 1.5 V at 60 A | |
| CV Mode | |||
Range | Low | 0 to 15 V | |
| High | 0 to 150 V | ||
Resolution | Low | 0.2 mV | |
| High | 2 mV | ||
| Accuracy | ±(0.05% + 0.05% FS) | ||
| CC Mode | |||
Range | Low | 0 to 3 A | 0 to 6 A |
| High | 0 to 30 A | 0 to 60 A | |
Resolution | Low | 0.05 mA | 0.1 mA |
| High | 0.5 mA | 1 mA | |
| Accuracy | ±(0.05% + 0.05% FS) | ||
| CR Mode | |||
| Range | 0.05 Ω to 30 kΩ | 0.03 Ω to 20 kΩ | |
| Resolution | 0.1 Ω | ||
| Accuracy | 1% | ||
| CW Mode | |||
| Range | 0 to 175 W | 0 to 350 W | |
| Resolution | 10 mW | ||
| Accuracy | ±(0.5% + 0.1% FS) | ||
| Transient Mode (CC mode) | |||
| T1 & T2 (1) | 100 μs to 60 s | ||
| Resolution | 2 μs | ||
| Accuracy | 1 μs + 100 ppm | ||
| Slew Rate (2) | 0.6 A/ms to 1.5 A/μs | 1.2 A/ms to 3 A/μs | |
| Readback Voltage | |||
Range | Low | 0 to 15 V | |
| High | 0 to 150 V | ||
Resolution | Low | 1 mV | |
| High | 10 mV | ||
| Accuracy | ±(0.08% + 0.05% FS) | ||
| Readback Current | |||
Range | Low | 0 to 3 A | 0 to 6 A |
| High | 0 to 30 A | 0 to 60 A | |
Resolution | Low | 0.1 mA | |
| High | 1 mA | ||
| Accuracy | ±(0.08% + 0.05% FS) | ||
| Readback Ripple (3) | |||
Range | Low | 0 to 15 V | |
| High | 0 to 150 V | ||
| Bandwidth | 250 kHz | ||
| Accuracy | 0.1% | ||
| General | |||
Protection | Over voltage protection (OVP), Over current protection (OCP), Over power protection (OPP), and Remote reverse voltage (RRV) | ||
| I/O Interfaces | RS232 and Handler | ||
| AC Input | 110 V/220 V ±10%, 50 Hz/60 Hz ±5% | ||
| Maximum Rated Input Power | < 50 VA | ||
| Temperature | 32 ºF to 104 ºF (0 ºC to 40 ºC) | ||
| Humidity | Indoor use, < 90% RH | ||
| Safety | EN 61010-2010+A1:2019, Low Voltage Directive (LVD) 2014/35/EU | ||
Electromagnetic Compatibility | EN61326-1:2021, CISPR 11, EN61000-3-2:2019+A1:2021, EN61000-3-3:2013+A1:2019+A2:2021, EMC Directive 2014/30/EU | ||
| Dimensions (W x H x D) | 8.4” x 3.5” x 15.4” (213 x 88 x 390 mm) | ||
| Weight | 6.61 lb (3 kg) | 10.58 lb (4.8 kg) | |
| Warranty | 3 Years | ||
| Standard accessories | Power cord and certificate of calibration | ||
(1) Fast pulse trains with large transitions may not be achievable.
(2) The slew rate specifications are not warranted but are descriptions of typical performance. The actual transition time is defined as the time for the input to change from 10% to 90%, or vice versa, of the programmed current values. In case of very large load changes, e.g. from no load to full load, the actual transition time will be larger than the expected time. The load will automatically adjust the slew rate to fit within the range (high or low) that is closest to the programmed value.
(3) Accuracy typical. Applies to supplementary Vpp, Ipp, and Ppp measurements.
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