DigiVac 801W Series Руководство по эксплуатации - Страница 7
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▪ 50 torr (50,000 microns) or higher for dry mechanical and diaphragm pumps).
▪ Connect Voltmeter leads to "Com" and "Vac" pins.
▪ The voltage should be approximately .161 Volts dc. Make slight adjustments, if necessary,
so the low end vacuum reading is correct.
If the above readings cannot be attained, either
the instrument, the gauge tube, or the cable is
defective. Gauge tubes often become
contaminated with oil. Cleaning the gauge tube
with a strong solvent, such as a carburetor
cleaner can often improve or restore its
calibration.
To the right is an 801/810 series unit with the
front panel removed. The atmosphere pot is at
the top and the zero is at the bottom in the
center.
The various test points are at the top of the
board and are identified with writing. For user recalibrations, it is only necessary to adjust
the zero pot. It can be reached through a hole in the front panel, so disassembly is not
necessary.
7.0
CONTROL SETPOINTS
To adjust the control setpoints of the Model 200P, carefully remove the display lens. This is
accomplished by gently prying the bottom of the lens with a small screwdriver (available
from Radio Shack). On the left of the instrument are two potentiometers and a three
position jumper strip. The jumper strip has a shorting bar attached to it. When this bar is
removed, the unit displays indicated vacuum. When placed so as to short out the left two
pins, the unit will display the #1 setpoint. When placed on the right, it displays #2. Place
the jumper for the desired setpoint, and adjust the potentiometer.
On the Model 800 series gauges with controls, the setpoints are adjusted by pressing front
panel mounted buttons and turning the adjacent potentiometers. When the button is
pressed, the setpoint shows up on the display.
8.0
Rs-232 OUTPUT
On units equipped with Rs232, the current value on the screen is sent out the Rs232 port
approximately one time per second.
The parameters are: 9600 baud, 8 data bits, 1 stop bit, no parity.
No prompting or handshaking by the user is required.
Model 200P with red lens removed
Jumper
Set Pot
801/810 series
Atm
Vac
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