TELEVAC CC-10 - Crystal gauge atmospheric pressure adjust mode

CC-10
INSTRUMENT MANUAL
Phone:(215) 947-2500 fax:(215) 947-7464 e-mail:sales@televac.com web site:www.televac.com
CC-10 MANUAL REV D
Page 13 of 40
Y
TELEVA
SP2 ,SP3 Setting Mode The settings of SP2L, SP2H, SP3L and SP3H are possible. Follow the same
procedure as SP1L/SP1H setting.
The crystal gauge atmospheric pressure adjust mode The crystal sensor which covers pressures from Atmosphere
to about 10 millitorr need to be calibrated at atmosphere when the instrument is first installed. Because the gauge
is factory calibrated before shipment, the calibration at user site is not usually necessary unless the physical
elevation of the user‟s location is substantially above sea level. When the crystal sensor is replaced for
maintenance or if the displayed value at atmosphere is shifted, perform the calibration as follows.
T h e c r ys t a l g a ug e a t m osph e r i c p r e ssu r e a d j us t m e n t m od e : when “parameter lock” is enabled this
adjustment is not possible. Make sure if lock is disabled before the programming. (Refer to 4.2)
Note: The same adjustment can be triggered from I/O pin #14. See section 8.
HV
SP2
SP1
SP3
SP3
SP2
SP1
HV
Torr
Torr
X10
X10
FUNC
FUNC
ENT
ENT
Blink
Crystal Gauge
ATM Adjust Mode
Crystal Gauge
ATM Adjust Mode
Lit Blink
The character “01 on” on the display shows the unit is in this mode
Make sure the system is vented to atmosphere then push [ENT] key. It triggers the
adjustment, instructing the sensor to fit the measurement to the pre-set atmosphere
value at the event.
*As to the pre-set atmosphere value see below.
Note: If, by some mis-operation, the adjustment is triggered when the system is
in vacuum “ErrA” is displayed and the adjustment will not be completed.
The unit regards the crystal sensor signal as the pre-set atmosphere pressure
and adjusts the measurement to fit the value. The default atmospheric pressure
value is 760 Torr. If actual atmospheric pressure is considerably different from
760Torr (for instance a high altitude locale) changing the atmosphere value is
necessary. To change the Atmosphere value setting, follow the procedure below.
(1) Push horizontal arrow key [→] to indicate the current set value.
(The set value is displayed in Torr unit.) The first digit will blink.
(2) Select the digit to be changed with [→] key. Then select the
value by vertical arrow key[↑].
(3) Push [ENT] key to register the new set value. The unit returns to measure
mode.
* These procedures only change the Atmosphere pressure value. To perform
the Atmospheric pressure adjustment, enter this mode again and press [ENT]
key.
* When the unit shipped the value is set at 760 Torr. This procedure is not
necessary unless the customer site is high above sea level and the
Atmosphere pressure is much lower than 760
Torr.
8-5