* Please note that as of 1 January 2008 this instrument is no longer listed to UL 3111 by ETL. The design, construction, testing, and calibration of the instrument has not changed, but rather Hypatia no longer maintains the certification service of ETL due to the high costs of the service relative to the sales volume of this instrument. Please contact Hypatia Inc.if you have questions or concerns about this aspect of the instrument.
Certain UL, CSA, VDE, TUV, BABT and other safety certification
specifications require that your product's earth grounding system
pass an impedance test while simultaneously carrying a substantial
fault simulation current. The Model 309 fully satisfies these
requirements, including AC test current requirements, in a fast
and efficient manner as required in production line environments.
This instrument features a 16 bit Motorola 68HC16 microcontroller,
updatable flash memory based Operating Software, a network card
slot, and ActiveX software support to provide versatile automation
technology support. Very dense over-sampling of remotely sensed
waveforms at high A/D resolution (16 bit) and precision fixed
components provide clearly superior accuracy, yielding the highest
level of confidence in your safety verification measurements.
A five digit led display indicates impedance in milliohms from 0 to 100 ohms, and a precise dot or bar graph meter indicates true RMS test current (which may also be displayed digitally if desired). An additional display indicates test time in minutes and seconds. The test current is continuously variable from near 0 to over 60 amps. Generally no adjustment of the test current is necessary when testing similar products, but it should be monitored by reference to the bar graph or audio alerts. Basic accuracy is ±1%. Typical accuracy of current production instruments is better than .1% (1/10%) for all readings - tighter new specs will be published soon. Tests are timed in one second increments up to a maximum of one hour. Test termination and reset for next test occur automatically. Settable audio alerts for high impedance, low test current and high test current are provided. Test time, audio alert thresholds and other parameters are set by a rotary actuator and easy to follow menu interface with front panel display cues, and stored in flash memory. A 100 milliohm resistor mounted on the rear panel allows informal daily verification of impedance accuracy.
The network card slot is equipped with a standard multi-mode serial card which provides AppleTalk, LocalTalk, EIA-422/485 and EIA-232-E (aka RS-232). (LocalTalk software support is not yet available, but planned.) IEEE-488 (GPIB), USB and other cards are planned. Current software includes refined ActiveX programming support, a modified SCPI command set, a Windows® and Windows NT® utility which provides virtual instrument operation, calibration support, an Operating Software update installation utility, a duty cycle test utility, and additional functions. Software updates and support information are provided on the Web. Since the network interface is card slot based and the Operating Software is flash memory based, this instrument will evolve with you as networking and software technologies move forward.
Remote sensing is built into all probes, thus eliminating cable resistance errors. The probes are of modular design, easily interchanged, and offer a higher level of interconnection efficiency and versatility than connection systems from any other vendor, and unsurpassed measurement accuracy.
State of the art design utilizes only precision fixed components. There are no internal hardware adjustments, and therefore no internal access is necessary. Software calibration or performance verification are straightforward closed case procedures, yielding very high economy, safety and consistency of certification maintenance. Hypatia recertification is only $50 fob (1998).
Macintosh, AppleTalk and LocalTalk are trademarks of Apple Computer Inc. Windows and Windows NT are registered trademarks of Microsoft Corporation.
Specification Sampler (complete specifications)
Note: The typical accuracy of the latest instrument version is better than .1% (1/10%). Tighter new specifications will be published later.
° Impedance Measurement (true rms based):
Accuracy: ± 1% of reading ** Range: 0 to 100 ohms
° True RMS Digital Current Measurement:
Accuracy: ± 1% of reading ± 4 mA Range: 0 to 144 Amps rms
° True RMS Bar Graph Current Measurement:
Accuracy: ± 1% ± 4 mA Range: 2.5 to 77.5 Amps rms (0 to 2.5 Amps implied)
° Duty Cycle: Continuous to 35 Amps. Derate linearly to 50% at 60 Amps ° Input Power: 90 to 132 Vrms, 3.0 Amps maximum ° Temperature Range: 5 to 40 °C ° Network Slot Cards:
Multi-mode serial standard, which includes: AppleTalk, LocalTalk, EIA-422, EIA-232-E (aka RS-232), and EIA-485
° Half rack width x 11.21 cm (4.41") height ** All probes incorporate remote sensing. However, probe connection to unit under test contact impedance adds approximately 1 to 2 milliohms to measurements. This error is eliminated if the Model 109 Kelvin probes are utilized.
Hypatia Inc. Contact Information ucecage@Hypatia.com. Report mail misconduct to firstname.lastname@example.org.