5
2.2.1 AC Power Switch
When the AC power is turned on the unit starts up with the OUTPUT off,
R/T MODE selected, and the display in the PRESET mode.
2.2.2 Analog Output
A BNC connector can be used to monitor the temperature sensor value.
The transfer function of the output is dependent on the sensor type se-
lected. The thermistor current selection values are either 10µA or 100µA
and result in either 100 kΩ/V or 10 kΩ/V respectively. Both IC sensors have
a transfer function of 100°C/V.
2.2.3 Mode Switch
The Model 300 Series can be operated in either 1) constant R (thermistor
resistance), 2) constant T (IC sensors), or 3) constant I
TE
mode. The R/T
mode is used with temperature sensors and the I
TE
mode to maintain a
constant output current.
2.2.4 Output Section
Output ON Switch
Pushing this switch allows current flow to the TE module. The output stays
on, as indicated by the green LED above, until the switch is pushed again or
an error condition occurs.
Error Indicator LED
An ERROR condition occurs when there is an open circuit to the TE module
or temperature sensing device. The output current is automatically turned
off. Once the device is replaced or reconnected, pushing the output switch
twice will clear the error indication and restore the output on condition.
Limiting Indicator LED
This LED lights up whenever the output current reaches a user adjustable
threshold, limiting the current flow to the TE module. It usually occurs
during initial startup as the drive circuitry attempts to reach equilibrium.
Limit Set
A small slotted screwdriver is used to access a recessed trimpot to adjust
the unit’s output current limiting level. Toggle the DISPLAY section push-
button to the LIMIT indicator and adjust the readout (in Amps) with a
clockwise rotation to increase the protection level.
2.2.5 Status
The STATUS indicator LEDs show whether the device under temperature
control is being heated or cooled.
2.2.6 Display
A 3 1/2 digit green LED display is located in the top center of the front
panel. It reads in kΩ when displaying a thermistor resistance value, °C
when displaying an IC sensor temperature, or Amps when in the constant
current I
TE
mode. Pushing the switch cycles through the display values as
described below. Display modes can be toggled with the output on or off.
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