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556/556H
High-Voltage Power Supply
Specifications PERFORMANCE OUTPUT POLARITY Positive or negative, selected by switch on rear panel. OUTPUT RANGE 50 to 3000 V; minimum usable voltage 10 V.OUTPUT LOAD CAPACITY 0 to 10 mA.  REGULATION £0.0025%
variation in output voltage for combined line and load variations within operating range
at constant ambient temperature.TEMPERATURE INSTABILITY <±50 ppm/°C after 30-minute warmup; operating range 0 to 50°C. LONG-TERM DRIFT <0.01%/hour and <0.03%/24-hour variation in output voltage at constant input line voltage, load, and ambient temperature after 30-minute warmup.OUTPUT RIPPLE <10 mV peak-to-peak, 20 Hz to 20 MHz. OVERLOAD PROTECTION Internal circuitry protects against overloads including short circuits.RESETTABILITY Output voltage can be reset to within 0.1%. CONTROLS POWER Front-panel toggle switch energizes unit when power cord is connected to appropriate source, and an adjacent red LED lamp indicates when power is applied. OUTPUT VOLTAGE One 6-position switch, one 5-position switch, and one 10-turn precision potentiometer; output voltage is the sum of the 3 settings.METER Front-panel toggle switch selects display of output voltage in V or load current in mA. POLARITY Rear-panel switch selects either positive or negative output polarity.CONTROL Rear-panel locking toggle switch selects the reference source for the output voltage. INT Selects the internal reference source; the front-panel controls select the output voltage.EXT Selects the external reference source; output voltage is proportional to magnitude of reference input. AC VOLTAGE Rear-panel slide switch selects either 115 V or 230 V ac input voltage.INPUTS AC POWER 103–129 V or 206–258 V, 47–63 Hz, 70 W nominal at full output power; supplied through international standard IEC power connector on rear panel. Fuse rating: 1.5 A, 250 V fuse for 115 V ac operation or 0.75 A, 250 V fuse for 230 V ac operation. EXTERNAL CONTROL Full range of output voltage can be based on an external dc reference level furnished through a rear-panel BNC connector; control voltage range is 0 through ±6.9 V dc; control voltage polarity must be the same polarity as that selected by the rear-panel Polarity switch; this input protected against over-voltages >±7 V. Input impedance >45 kW.OUTPUTS REGULATED DC OUTPUT The adjusted and regulated voltage, with selected polarity, is furnished simultaneously to the two SHV connectors on the rear panel. INDICATOR METER Front-panel LCD display indicates output voltage in kV ±10 V or load current in mA ±10 µA. Load current is sum of external load current and internal load current. Internal load resistance is ~5 MW. ELECTRICAL AND MECHANICAL POWER REQUIREMENTS 115 or 230 V ac, 47–63 Hz, 70 W nominally at maximum output load. WEIGHTSNet 556 3.6 kg (8.0 lb). 556H 5.7 kg (12.6 lb). Shipping 556 4.5 kg (10.0 lb). 556H 6.6 kg (14.6 lb). DIMENSIONS ORDERING INFORMATION
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