MKS Baratron 628A - Page 36

Setup Cha
p
ter Two: Installation
28
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 is properly warmed up (refer to page 25 for warm up times) and
pumped down below its resolution (refer to Table 6, page 26, for recommended pressure
levels).
For best results, pump the transducer while it is warming up.
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. 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.
6. Re-install the plastic ring.
7. Adjust the ZERO pot (located on the top of the unit) to bring the output to exactly zero
Volts.