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3-2 Operating Information
Normal Start-up
1) Connect the interface cable from the HCM-300 to the transducer.
(See figure on page 2-4 of this manual)
2) Verify that the AC power to be applied to the HCM-300 is correct (115 VAC).
3) Apply AC power to the HCM-300.
4) The HCM transducer has a local zero adjustment. Follow the zero
adjustment procedure described in the HCM-6000 series manual.
Caution
Before applying power to the instrument, ensure that the line voltage being
applied is correct. Failure to do so may result in damage to the instrument
which is not covered by the warranty.
Analog Output
The HCM-300 generates an analog signal which is directly proportional to the
displayed pressure. The analog output signal is given by:
The output signal is a DC voltage with a full scale reading for a given capacitance
manometer transducer corresponding to +10 VDC. For example, if one has a 100
Torr HCM transducer with a displayed pressure of 35 Torr, then the output volt-
age will be:
The uncertainty associated with the analog output voltage is given by:
(1)
(2)
(3)