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Figure 1. Error and ... through the unit under test, and to a 50 ohm termination.
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TEST PROCEDURES FOR CURRENT MONITORS
In calibrating our current monitors, we make use of low inductance precision resistors whose resistance value is calibrated with NIST traceable standards. The value of resistance used depends on the sensitivity of the current monitor under test. Resistors of 1, 0.1 and 0.01 ohms are available, and for monitors of intermediate sensitivity, multiple turns of the test conductor are used. A current pulse is generated by gating the output of a power supply with an IGBT transistor switch. The switch is controlled by a pulse generator. The pulse current passes through the current monitor and through the calibrated low inductance resistor to ground. The voltage drop across the resistor is subtracted from the voltage produced by the Current Monitor and the difference signal is observed on an oscilloscope (Figure 1). This display is used to measure error and droop.
Figure 1. Error and Droop Test Setup
Since the Current Monitors are linear, it is not necessary to use large current pulses. The pulse source which we utilize has settings for 8.0 and 0.8 amperes, and a pulse width of up to 1 millisecond, with a low duty cycle. All current monitors are tested for rise-time performance at two points in the manufacturing cycle. The test set-up is shown in the accompanying diagram (Figure 2).
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Figure 2. Rise-time Test Setup The pulse generator is either a Tektronix PG 508 or a fast pulser designed and built in-house. Current from the output jack is fed through the unit-under-test to a 50 Ohm termination. The current monitor is connected to a second in-line termination at the oscilloscope input. The oscilloscope is triggered by applied current at the terminating resistor. The HP 54615B digital storage oscilloscope is used. For low sensitivity models, the HP 462A amplifier is used between the Current Monitor and the termination. A setting of 40 dB is usually used. The variable rise-time feature on the function generator is used for the test. The range setting for this control, as well as the settings for the oscilloscope, are made according to which model is being tested. The test consists of setting the variable rise-time control so that the leading edge of the square wave shows the rise-time given in the specification sheet for the particular model being tested. The overshoot and ringing must be less than 10% of the squarewave transition amplitude. The effect of test wire location is then checked by moving the test wire about in the Current Monitor hole. If variations in the waveform occur outside the 10% limit for overshoot and ringing, the unit needs corrective work.
