Bently Nevada 3300/46, Operation Manual

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Ramp Differential Expansion Monitor Maintenance
1 13 I C a l i b r a t e Channels [Cont]
12. A c t i v a t e the meter adjust dip switch (MA) by
moving i t t o t h e left. T h e differential
expansion signal will begin to flash on the left
LCD display.
13. M e a s u r e the voltage at test point Channel A
(TA) using the multimeter. Adjust both power
supplies to ZPV (reference Table 9). Press
the GAP switch and use the System Monitor
(T) and (1) switches to adjust the voltage at
TA to +2.5 ± 0.03Vdc.
14. D e a c t i v a t e the meter adjust dip switch (MA)
by moving it to the right. I f the short is
removed from the calibration terminals (CA)
before the dip switch is deactivated, the
adjustment will not be stored.
15. R e m o v e the clip lead (jumper) from the
calibration terminals (CA).
TABLE 10. Formulas for Full Upscale Volts
84414-01
Full Upscale Volts (FUSV) Vdc
Single Ramp Option P r o b e A
Direction D u a l Ramp Option P r o b e A or B
Probe B
Upscale Toward
Probe A
Upscale Away
From Probe A
ZPV +(0.5 sin 8 )(TSF)(MR) Z P V + (0.5 tan 8)(TSF)(MR)
ZPV -(0.5 sin 8)(TSF)(MR) Z P V - (0.5 tan 8)(TSF)(MR)
Example: A user has a 25mm probe and a 0.25-0-0.25 inch full scale range. The monitor is configured
for upscale toward probe A with dual ramp angles of 14 degrees.
(1 inch = 1000 mils, 1 V = 1000mV)
TSF = 20mV/mil
MR = 0.5 inches
FUSV = -6.5Vdc + (0.5 sin 14)(20mV/mil)(1V/1000mV)(1000mils/inch)(0.5inches) - 5 . 2 9 Vdc
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LO 'd
£203/20L 'ON XV.4 O N I E N N W 9 9 : E 1 aim 66-80-011