Bently Nevada 3300/46, Operation Manual

Page: 61 / 86

Ramp Differential Expansion Monitor Maintenance
13 Calibrate Channels [Cont]
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8. Activate t h e channel A gain adjust dip
switch (GA) b y moving i t t o t h e left. T h e
channel A bargraph w i l l b e g i n t o flash.
Measure the voltage at Test point channel A
(TA) using the multimeter. A d j u s t the power
supply t o the Full Upscale Voltage (FUSV)
(reference Table 10).
9. Press the GAP switch and use the System
Monitor (r) and (I) switches to adjust the gain
until the Test point channel A (TA) is at +5.0
+0.05 Vdc and the BYPASS LED is on steady
(not flashing). T h e flashing BYPASS L E D
indicates an overrange condition. If this occurs,
reduce the -gain using the System Monitor (I)
switch.
10. Deactivate the channel A gain adjust dip
switch (GA) b y moving it to the right. If the
short is removed from the calibration terminals
(CA) before the dip switch is deactivated, the
adjustment will not be stored.
11. Repeat steps 8 through 10 for channel B
substituting GB and TB.
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