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7100 Calibration Bath
User's Guide
9.5
9.6
9.7
42
New units selected
Un= F
Press "SET" to accept the new selection and resume displaying the bath
temperature.
S
Set the new units and resume temperature display
Secondary Menu
Functions which are used less often are accessed within the secondary menu.
The secondary menu is accessed by pressing "SET" and "EXIT" simulta-
neously and then releasing. The first function in the secondary menu is the
heater power display.
Heater Power
The temperature controller controls the temperature of the bath 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. This value
may be estimated by watching the red/green control indicator light or read di-
rectly from the digital display. By knowing the amount of heating the user can
tell if the bath is heating up to the set-point, cooling down, or controlling at a
constant temperature. Monitoring the percent heater power lets the user know
how stable the bath temperature is. With good control stability the percent heat-
ing power should not fluctuate more than ±1% within one minute.
The heater power display is accessed in the secondary menu. Press "SET" and
"EXIT" simultaneously and release. The heater power will be displayed as a
percentage of full power.
S+E
Access heater power in secondary menu
Heater power in percent
12 Pct
To exit out of the secondary menu press "EXIT". To continue on to the propor-
tional band setting function press "SET".
E
Return to temperature display
Proportional Band
In a proportional controller such as this the heater output power is proportional
to the bath temperature over a limited range of temperatures around the
set-point. This range of temperature is called the proportional band. At the bot-
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