Can one ESA620 run at either 120 V acor 220 V ac?
Can the ESA620 directly print test records or manual tests?
Does the ESA620 have autosequences with programmable test limits?
Does the ESA620 have internal memory for test record storage?
Does the ESA620 have the same range of ECG simulation features as the Impulse7000DP?
Does the ESA620 have the same range of ECG simulation features as the medTester5000C?
Does the ESA620 replace the medTester5000C?
With only one lead attached in dual lead or Patient Auxiliary, a current is detected for example 40 ÂµA. Why?
Explanation: This effect is not an issue when testing actual medical equipment; any current measured through a medical device's CF or BF leads is a result of real leakage through the medical device.
In the situation of one lead only, the Safety Analyzer is measuring the current flow due to its meter capacitance in addition to the current generated by the power source. Any safety analyzer will have some measurable capacitance between Protective Earth and the Analyzer's meter. The design of the Safety Analyzer minimizes this capacitance. When attempting to measure a very low leakage value, such as that from a CF patient monitor lead, even a 20 or 30 ÂµA current can be of concern. However, using a voltage source (mains voltage and resistor) could potentially set up a leakage path from the source coupled through meter's capacitance to Earth. Additionally, switching the polarity of the leads may appear to reduce this problem; in fact, the current is being coupled through capacitance to ground before going through the meter, so less current is detected.
An experiment using an ammeter on either side of the Safety Analyzer will tell you what the "true" current is that flows through the Patient Leads. The amount of current can be different between the ammeter and the Safety Analyzer. The ammeter is a wideband detector, and the Safety Analyzer is designed to replicate a patient's high frequency rolloff based upon the IEC and AAMI standards at approximately 1 kHz, so some higher current is possible on the ammeter if there is a high frequency component to the source.
When evaluating an ESA620, Fluke Biomedical recommends using an isolated power supply as the source: either an isolation transformer powering a calibrator used in the current source mode or an actual AC/DC current source. The best source is a truly isolated source: one that is powered by batteries. If an un-isolated source is used, use a Fluke multimeter on both sides of the Safety Analyzer's connections to determine the "true" current through both patient leads.
Fluke Biomedical has conducted extensive product validation on the ESA620; meter capacitance will not affect the measurements when the Safety Analyzer is used to test medical equipment in accordance with US & International medical device testing standards.