Section D - Electronic Adjustment And Setup Procedures; Setting Up The Moisture Signal; Setting Up The Density Signal; Reassemble The Gauge - Troxler 3401 Installation Procedures Manual

5. Before installing the metal UBB cover verify the
setup procedure in Section D.
SECTION D -
and Setup Procedures
1. Place the gauge on the standard block. Turn
on the gauge.

Setting up the moisture signal:

2. Set the oscilloscope to 200 mV scale, ac coupled and very small
µsec(s) time base.
3. Locate the test point "M-ADJ" on the UBB. This is located at the
upper right of the UBB below the battery connections.
4. Place the scope probe in the test point and connect the ground lead
of the probe to the gauge aluminum base.
5. Using the scope and small screwdriver, adjust potentiometer R33
until you have a moisture signal at this test point with peak
amplitude of 600 mV.

Setting up the Density signal:

6. Locate the test point "D2-ADJ" and "D1-ADJ" on the UBB.
These are located on the lower side of the UBB left of the jumpers.
7. Place the scope probe in one test point and connect the ground lead
of the probe to the aluminum gauge base.
8. Using the scope and small screwdriver, adjust potentiometer R15
(for "D2-ADJ") and R7 (for "D1-ADJ") until you have a density
signal for each of these test points with a peak amplitude of 600
mV.

Reassemble the gauge:

9. Turn off the gauge and discharge the high voltage circuit by
shorting the "HV-Discharge" pins on the upper left corner of the
UBB with an insulated metal object such as a screwdriver.
10. Place and secure the metal cover on the UBB.
11. Reassemble the gauge.
12. The gauge will need to re-calibrated or
verified for accurate results according to
ASTM D2922.
Electronic Adjustment
7