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Module I/O Specifications
A28 Power Supply
A28 Power Supply
This spec is for the complete assembly which includes the transformer and plug-in boards.
Input
❒ Overvoltage protected.
❒ +21 Volts and +25 Volt supplies always on, all other supplies controlled with front
panel power switch.
❒ Short circuit protected.
❒ Thermal shutdown capability.
❒ Two supply short protection (shorting +25 unregulated is protected only by fuse).
❒ Fan turns off with power down.
❒ Fan speed is a function of temperature.
Outputs
Nominal Line Voltages: 100, 120, 22, 240
Tolerance: +7%, -14%
Frequency Range: 48 to 440 Hz
Supply
Voltage
Tolerance
incl. load
limit Line Rel.
Ripple RMS
Max CW
Spur
a
RMS
a. This is the spec for rates greater than 60 kHz. For rates less then 60 kHz the spec increases
by 6 dB per octave until we reach a maximim of 100 µV at rates less than 600 Hz.
Total noise 20
Hz-20 MHz
Noise nV/√Hz
@20 kHz
+38 V 1% .3A .1 mV 1 µV 1mV 400
+15 V 1% 4.2 A .1 mV 1 µV .3 mV 150
-15 V 1% 2.6 A .1 mV 1 µV .3 mV 150
+5.2 V 1% 12.8 A .1 mV 1 µV .1 mV 50
-5/2 V 4% 3.0 A .1 mV 1 µV .1 mV 50
+12 Aux V 1% 2.0 A .1 mV 1 µV .2 mV 100
+25 Unreg -10% +60% 3A fuse 1V 10 µV
+21 V 1% 1 A Three terminal regulator