Model 4431T Shielded Bag Test System - Operating Manual
14
D00003 Rev. K.
T, nsec 100 200 300 400
Figure 6-2: Test bag
position
6.3 Running the test.
This section describes manual testing. (See the next section for automatic testing.)
Set the FUNCTION switch on the front panel of the 4431 Discharge Unit to MAN nJ.
Adjust the Voltage on the Discharge Unit for a reading of 1,000 ±10 Volts.
Set the oscilloscope CH1 vertical sensitivity to 50mV/div, Horizontal time base to 50nsec/div, and
CH1 trigger level to 50mV. Trigger mode is NORMAL.
Turn on the HV.
Press the SINGLE button on the oscilloscope, then initiate a discharge, using either the 4431
Discharge Unit front panel TEST button or the foot switch. Each time these two steps are done, a
discharge will occur.
The current pulse generated by the discharge will be detected by the capacitive sensor and will be
displayed on the oscilloscope. Typical waveforms for a static shielding bag are shown in Figure 6-3.
Figure 6-3: Typical shielded bag
waveform
The waveform data may be transferred from the oscilloscope onto a FLASH memory device or to a
computer via USB, for processing by user software.
