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screwdriver or similar tool. Remove the VOLTAGE SELECTOR CARD
and move the INDICATOR pin so that it lines up with the desired voltage
designation on the cover. To change the fuse(s), loosen the Phillips head
screw 2 turns, remove the fuse block by sliding up, then away from the
Phillips screw. Change fuses. (Note: for some European installations, 2
fuses may be required; otherwise, a dummy fuse is used in the Neutral
[lower] holder.) Insert the FUSE BLOCK and slide back onto the Phillips
screw and pedestal. Tighten the Phillips screw and replace the cover.
Reinstall the COVER assembly into the Housing. For 220/240 Volt
operation, a 3/4 Amp, 250 VAC, 3AG Slo Blo fuse is also used.
2.4.2 Recorder Output
The RECORDER OUTPUT enables the instrument to be connected to a
high-speed chart recorder (preferred recording device) or an oscilloscope
using a standard BNC cable to display the decay time curve. This output
is the same signal that drives the SAMPLE CHARGE meter. NOTE: The
double pulse generated when the TEST state is activated will affect the
scope trigger. A storage oscilloscope must be used in the single shot
mode and the time base adjusted so the actual discharge waveform will
be displayed which begins with the second pulse. The first pulse is the
sensor self zero that is activated when the decay measurements begins.
The output level is an inverted ±10 Volt analog signal corresponding to
the SAMPLE CHARGE meter reading. A –10V signal corresponds to a
+5kV reading on the SAMPLE CHARGE meter and conversely a +10V
signal corresponds to a –5kV reading.
2.5
Faraday Test Cage
The Faraday Test Cage is designed to hold the test sample and shield it from
any outside electrostatic interference. The standard magnetic electrodes are
designed to hold film or fabric samples magnetically. While the Clamp
Electrodes are used to hold sheet, foam, and samples up to one inch thick,
optional I.C. Tube Electrodes for non-destructive testing of I.C. Shipping Tubes,
Loose Fill Electrodes for testing loose fill chips, and Ring Electrodes for non-
destructive testing of bottles, cups and canisters are available.
2.6
System Test Module
2.6.1 STM-2
The STM-2 System Test Module performs in a manner similar to an
actual test sample. It contains only resistors and utilizes the capacitance
of the electrode assembly to determine decay time. It performs the same
function as the previous STM-1. It can be used in all prior Model 406
Static Decay Meters.
The STM-2 can be used to set the full scale of the SAMPLE CHARGE
meter.
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