1.9 Model 648 Specifications
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1.9 Model 648
Specifications
1.9.1 Output
Type:
Bipolar, 4-quadrant, DC voltage/current source
Current generation:
Fully linear regulation with digital setting and analog control
Current range:
±135 A
Compliance voltage (DC):
±75 V
Power:
9.1 kW nominal
Nominal load:
0.5
)
, 0.5 H
Maximum load resistance:
0.55
)
for ±135 A DC operation at +10% to -5% line
voltage
Minimum load resistance:
0.41
)
for ±135 A DC operation at +5% to -10% line
voltage
Load inductance range:
0 H to 1 H
Current ripple:
10 mA RMS (0.007%) at 135 A into nominal load
Current ripple frequency:
Dominated by the line frequency and its harmonics
Temperature coefficient:
±50 ppm of full scale/°C
Line regulation:
±75 ppm of full scale/10% line change
Stability (1 h):
2 mA/h (after warm-up, internal setting)
Stability (24 h):
10 mA/24 h (typical, internal setting, dominated by temperature
coefficient and line regulation)
Isolation:
Differential output is optically isolated from chassis to prevent ground
loops
Slew rate:
50 A/s into nominal load (dominated by magnet characteristics),100 A/s
maximum into a resistive load
Settling time:
<1 s for 10% step to within 1 mA of output into nominal load
Harmonic distortion:
≤
0.1 Hz at ±135 A sine wave into resistive load, <0.02% THD;
≤
10 Hz at ±10 A sine wave into resistive load, <0.30% THD
Attenuation:
-0.5 dB at 10 Hz (external programming input)
Protection:
Short circuit, line loss, low line voltage, high line voltage, output over
voltage, output over current, and over temperature
Connector:
Two lugs with 8.64 mm (0.34 in) holes for M8 or 5/16 in bolts
1.9.2 Output
Programming
Internal current setting
Resolution:
1.0 mA (20-bit)
Settling time:
600 ms for 1% step to within 1 mA (of internal setting)
Accuracy:
±20 mA ±0.05% of setting
Operation:
Keypad, computer interface
Protection:
Programmable current setting limit
Internal current ramp
Ramp rate:
0.1 mA/s to 50.000 A/s (compliance limited)
Update rate:
12.3 increments/s
Ramp segments:
5
Operation:
Keypad, computer interface
Protection:
Programmable ramp rate limit
External current programming
Sensitivity:
10 V/135 A
Resolution:
Analog
Accuracy:
±20 mA ±1% of setting
Input resistance:
20 k
)
differential, 50 k
)
common-mode
Operation:
Voltage program through rear panel, can be summed with internal
current setting
Limits:
Internally clamped at ±10.1 V and bandwidth limited -3 dB at 40 Hz (2 pole,
low pass filter)
