MKS Baratron 622D, Руководство пользователя

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Chapter Two: Installation Setup
27
Note
Use the coarse zero adjustment only if the zero potentiometer fails to
provide sufficient adjustment.
The COARSE ZERO control is accessible through the side of the instrument, as shown in
Figure 5.
Figure 5: Location of the COARSE ZERO Adjustment Control
Follow the steps below to adjust the coarse zero:
1. Install the transducer in a system with a power supply/readout.
2. Turn the transducer on.
3. Be sure the transducer has been operating for at least 15 minutes and is pumped down
below its resolution (refer to Table 6, page 26, for recommended pressure levels).
4. Center the ZERO pot located at the top of the transducer (adjust the screw to leave an
equal amount of adjustment both clockwise and counterclockwise).
5. Remove the top plastic outer ring by rotating 45° CCW for 626D 0.10 Torr only.
6. Turn the COARSE ZERO’s multi -position switch (located on the side of the unit) to a
position that produces the output signal closest to zero Volts.
7. Re-install the plastic ring.
8. Adjust the ZERO pot (located on the top of the unit) to bring the output to exactly zero
Volts.
COARSE ZERO
Adjustment
ZERO
Potentiometer
ZERO
Type 62X
Pressure
Transducer
+15 VDC-250 mA
PIN SIGNAL
2 Sig Output
5 Pwr Com
6 -15 VDC
7 +15 VDC
12 Sig Com
15 Chassis