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DMI 551

DMI 551
2Pages

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DMI 551 Digital Measuring Instrument The DMI 551 has implemented a flash detector which stores and shows the last voltage measurement and its polarity before a breakdown or flashover occurs. The instrument is specially designed for use in high voltage laboratories where a high degree of accuracy is necessary. Typical main applications of the DMI 551 include measurements of a voltage divider output or for automated product testing where the DMI 551 is integrated into a complete control and measuring platform. Impulse voltage measurement by capturing peak values of lightning or switching impulses. Impulse current measurement by acquiring the voltage across a current shunt. Triggering of generator and chopping gaps and any other measuring device. Flash detection of AC and DC flashovers. The generator can automatically be stopped from recharging Remote control to operate the unit from a computer or a laptop. The three separate measuring channels, as well as the trigger function are usable individually or in combination and can be activated by a software code. DC voltage measurement and evaluation of mean value and ripple factor. The Digital Measuring Instrument DMI 551 is a microprocessor controlled device for measuring AC, DC and impulse voltages. The instrument can also be used for firing a generator or a chopping sphere gap and to trigger an oscilloscope or any other measuring device. The triggers can be set for delays in time and in phase. AC voltage measurement by capturing rms, peak and peak/ 2 values. Plotter output for recording of AC and DC voltages on an external X-Y graph recorder. BENEFITS Easy to operate. Large LCD screen, case sensitive softkeys and special function keys reduce setup time and ensure intuitive and safe handling. Simple to upgrade. Software codes are used for activating the individual measuring modes. Uninstallation, transportation and reinstallation gets therefore superfluous. The instrument is built into a 19’’ standard housing with 3 height units. For ease of use the DMI 551 is equipped with a 5.2’’ liquid crystal display and a numerical keypad. Accurate and reliable. Well established hardware and extensively tested software allows meaningful and credible measurements. For remote control or data transfer the DMI 551 provides an RS 232 or a IEEE 488 interface. AC and DC measurements can be printed directly via a separate plotter port on an external X-Y graph recorder. Customized solution. Due to the flexibility of the DMI 551 many HV measuring applications can be covered with this single device. Cost effective investments are therefore guaranteed. For verifying AC voltage wave shapes the DMI 551 has implemented an AC out interface which can be connected to a CRO or other oscilloscopes. Transformer Testing As a measuring device the DMI 551 is in accordance to the international standard IEC 60060-2. Switchgear Testing Surge Arrestor Testing On customer request Haefely is able to calibrate the DMI 551 according to DKD (German Calibration Services) which is traceable to highest national and international standards a brand of Haefely is a subsidiary of Hubbell Incorporated. Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

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TECHNICAL SPECIFICATIONS AC Measurement Measurement modes Voltage range Frequency range Phase synchronisation Interfaces Remote control mean value, ripple Voltage range Ripple range System Configuration Processor peak value Voltage range 0 … 400 V (BNC jack) 0 … 1600 V (LEMO 4250) ± 1% rdg, ± 3 counts Measurement modes Impulse Measurement Measurement modes membrane type, 31 keys Environmental Conditions Operating temperature Humidity range Power Supply Line voltage Line frequency Power consumption Power supply switch Impulse inputs AC input/output DC input, Trigger outs Trigger delay X-Y...

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DMI 551 2Pages

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DMI 551
2Pages