12.0 OPERATING THE RH CALIBRATOR
In order to operate this instrument, it is assumed that you have read the
INSTALLATION section of this manual, and preliminary tasks have been done.
These include:
1. The Shipping Plug has been removed from the Saturator Fill Tube.
2. The Saturator has been properly filled with water.
3. The instrument has been connected to the AC power source.
4. If desired, the Analog and/or Serial Digital (RS-232) Output has been wired.
If not, the INSTALLATION chapter should be reviewed before proceeding.
Turn the Power Switch to the ON position. The small adjacent indicator lamp will
light, and the Digital Display will: (1) light up; (2) briefly indicate RH
CALIBRATOR by EDGETECH INSTRUMENTS INC.; and (3) go into the normal
display mode. A hum will be heard, indicating that the fans and vacuum pump
are operating.
12.1 SYSTEM STATUS
The status of the RH-CAL control systems may be seen in the upper right corner
of the Display. When first turned on, it will read STARTUP. At other times, it
may read MAX HEAT, or ABC: HEAT, or ABC: STABLE, or SEEKING DP. After
several minutes, the Display will read SERVOLOCK. This indicates that the
system is tracking the Dew Point, and that the RH condition in the chamber is
stabilizing.
The chamber should only be used for calibration when the display reads
SERVOLOCK and the RH reading has stopped changing and reads the setpoint
value +/- the RH-CAL accuracy specification.
12.2 KEYPAD OPERATION
The RH CALIBRATOR Panel has six keys that support user set up and
operation. The label for each key, and its function, is described below.
Key Function
C/F Toggles the displayed parameters, internal parameters and RS-232 output
between degrees Fahrenheit and Centigrade. Output values are also converted
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