9132 Portable IR Calibrator
User’s Guide
20
Press “SET” to accept the present setting and continue.
S
Accept scan setting
6.4.2 Scan Rate
The next function in the main menu is the scan rate. The scan rate can be set from .1 to 99.9
°
C/
min. The maximum scan rate however is actually limited by the natural heating or cooling rate
of the instrument. This is often less than 100
°
C/min, especially when cooling.
The scan rate function appears in the main menu after the scan control function. The scan rate
units are in degrees C per minute.
Sr=10.0
Scan rate in °C/min
Press “UP” or “DOWN” to change the scan rate.
Sr=2.0
New scan rate
Press “SET” to accept the new scan rate and continue.
S
Accept scan rate
6.5
Set-point Resistance
To display the Set-point Resistance, press the “SET” and “DOWN” keys simultaneously when
the temperature is displayed. When the “SET” and “DOWN” keys are released the temperature
is again displayed. This value is used to calibrate the unit and is not adjustable.
6.6
Temperature Scale Units
To toggle between °C and °F, press the “SET” and “UP” keys simultaneously when the tem-
perature is displayed.
6.7
Secondary Menu
Functions, which are used less often, are accessed within the secondary menu. The secondary
menu is accessed by pressing “SET” and “EXIT” simultaneously and then releasing. The first
function in the secondary menu is the heater power display.
6.8
Heater Power
The temperature controller controls the temperature of the well by pulsing the heater on and
off. The total power being applied to the heater is determined by the duty cycle or the ratio of
heater on time to the pulse cycle time. By knowing the amount of heating the user can tell if
the calibrator is heating up to the set-point, cooling down, or controlling at a constant tempera-
ture. Monitoring the percent heater power lets the user know how stable the well temperature
is. With good control stability the percent heating power should not fluctuate more than
±
1%
within one minute.
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