GENERAL DESCRIPTION
The Model 522 is a microprocessor controlled DC Voltage Calibrator and is a highly versatile reference source designed to meet the needs of today's demanding requirements for accuracy and stability. The unit's specified accuracies are traceable to the National Institute of Standards and Technologies.
APPLICATIONS
The Model 522 is a highly accurate reference which can be used in a variety of applications such as: the design, check and calibration of high speed, high resolution analog-to-digital converters; the design and certification of high speed data logging and process control systems; and the calibration of digital voltmeters and multimeters. It may be installed in systems as an “IMBEDDED STANDARD” and/or as a simulator. It may also be used for the design, testing, simulation and certification of thermocouples, strain gages and transducer instrumentation.
SPECIFICATIONS
VOLTAGE MODE SPECIFICATIONS
Range |
Full Scale |
Resolution |
Current |
Zo |
100mVdc |
±111.1110mVdc |
100nVdc |
EMF |
20 ohms |
10Vdc |
±11.11110Vdc |
10µVdc |
100mAdc |
10 milliohms |
100Vdc |
±111.1110Vdc |
100µVdc |
100mAdc |
10 milliohms |
Crowbar – Indicates selected/programmed short of terminals.
Accuracy (Relative to N.I.S.T. Standards):
The Accuracy statement is based on the “Limit-of-Error” (or “worst-case”) method. All other specifications noted hereafter, which affect accuracy, e.g.., line, load, temperature*, drift changes are included in the accuracy statement.
±(0.002% of setting + 0.0005% of range + 2µV).
Stability: 8 to 24 hours, ±0.00075%; 90 days, ±0.001%; 1 year, ±0.0015%.
Line And Load Regulation: ±0.0005% from no load to full load and/or for a 10% line fluctuation.
Noise And Ripple (rms): The following specifications are furnished in detail so the user can have complete confidence in the results of their tests.
Range |
0.1Hz to 100kHz |
100mV |
12µVrms |
1V (RA-7 Option) |
25µVrms |
10V |
35µVrms |
100V |
120µVrms |
CURRENT MODE SPECIFICATIONS
Range |
Full Scale |
Resolution |
Accuracy
±(% of setting +nA) |
Voltage Compliance |
10mAdc |
±11.11110mAdc |
10nAdc |
0.005 + 50 |
100V (max.) |
100mAdc |
±111.1110mAdc |
100nAdc |
0.005 + 200 |
100V (max.) |
Stability: 8hrs, ±0.00075%; 24 hrs, ±0.001%; 90 days, ±0.0015%; One Year, ±0.002%.
Line and Load Regulation: ±0.0005% from short circuit to full compliance and/or for a 10% line fluctuation.
GENERAL SPECIFICATIONS
Switching And Settling Times: Step changes, 5 milliseconds; range changes, 300 milliseconds.
Isolation:
Power transformer-to-analog output, 2.5 × 104M ohms, 300pF.
Control logic-to-analog output, optically isolated, 109 ohms, 130pF, 500Vdc.
Temperature:
Calibration: 23°C ±1°C
Ambient (limit-of-error), 20°C to 30°C
Operating Limit: –10°C to 50°C
Storage: –40°C to 85°C.
Temperature Coefficient: Ambient temperature, ±0.0005%/°C; operating limit, ±0.001%/°C.
Protection: Voltage mode, short-circuit and over-load protected. Current mode, open circuit protected. Indication by display message. Automatic recovery.
MECHANICAL SPECIFICATIONS
Power Requirements: 50 watts; 115 or 230V ac ±10%, 50Hz-60Hz.
Dimensions: 19" (48.3cm) wide, 3.5" (8.9cm) high, 18" (45.8cm) deep.
Weight: 14.7 lbs. (6.7kg) net; 23 lbs. (10.5kg) shipping.
TERMINALS
Output Terminals are mounted on both the front and rear panels. Both terminal sets are configured for remote sensing of the output as follows:
High Output and High Sense low Output and Low Sense Case Ground.
Rear Connector is mil. spec. type and is the primary location for the calibration/certification procedure.
The mate is supplied with new instruments.
Front Terminals are five-way binding posts. Mating connectors/cables are NOT supplied.
PROGRAMMING
Local (Manual): All functions can be controlled from the front panel.
Remote Control Included: IEEE-488.1 interface. The bus address is displayed on the front panel display and is selective via a dip-switch.
National Lab-Windows™: Drivers available on request.
Programming of the Model 522 is compatible to programs written for the Krohn-Hite Models EDC520 (A series) and the EDC521.
OTHER FEATURES
True Bipolar Operation
"Crowbar” Setting: A Zero Reference. This is in addition to the usual active output zero.
Alphanumeric Display
Output Connectors: Monitor Terminals on the front panel. Mil-Spec output connector on the rear panel. No terminal switching required when changing ranges.
GENERAL INFORMATION
Mounting: Rack mounting flanges are standard with all instruments at no charge. Bench mounting with removable tilt bale and feet.
Certification: A Certificate of Compliance is issued with each new instrument to certify the calibration and traceability to N.I.S.T.
Warranty: ONE FULL YEAR warranty on parts and labor includes specifications and performance.
OPTIONS
±1.0Vdc Range, Part No. RA-7: Resolution, 1µV; output current, 100mA; accuracy, ±(0.002% of setting + 0.0015% of range + 3µV).
Extended 1 Year Warranty: Part No. EW522.
Lab Windows and Lab View drivers are available for direct downloading from National Instruments at www.natinst.com.
Note: Drivers for Krohn-Hite Models EDC521 and EDC522 are listed under “520A”.
OPTIONAL ACCESSORIES
CAB-005: Cable, Two Conductor Shielded Balance Line
CAB-018: Cable, Multi-stacking Double Banana plug
CAB-023: Cable Set, Low Thermal EMF Retractable Banana
CAB-024: Cable Set, Low Thermal EMF Spade Lug
Specifications and prices are subject to change without notice.
* The limit-of-error applies over the standard ambient operating temperature. |
