TR-2 Thermoelectric Temperature Regulator
TR-2 Thermoelectric Temperature Regulator
3
Adjusting the Set-Point Temperature
The TR-2 displays two temperature values: the actual temperature and the set-point temperature. These values
are the same when the TR-2 has been running long enough to stabilize. The actual temperature is displayed (in
degrees C) on the TR-2.
To adjust the set-point temperature:
1. Press and hold the set-point temperature button to display the set-point temperature. The factory default
set-point temperature is 20
o
C.
2. Toggle the switch to change the set-point temperature. Release the set-point temperature button once
you reach the desired set-point.
3. Store the new set-point into memory. Press and hold the toggle switch down and press the set-
temperature button, then release the switch.
4. Verify the new set-point has been stored into permanent memory by unplugging the ADC interface cable
for approximately five seconds. Reattach the ADC cable and follow Step 1 again to display the stored set-
point.
Specifications
TR-2 Thermoelectric Temperature Regulator Specifications
Temperature regulator type:
Peltier thermoelectric device
Set-point temperature range:
15 °C below ambient to 37 °C
Set-point temperature default:
User-programmable; factory-set to 20 °C
Temperature control of optical bench:
To +/- 0.1 °C
Baseline and spectral stability (measured
over 24-hour period, for spectrometer only):
+/- 0.001 Absorbance Units (AU)
Effect on integration time:
Integration times >10 seconds can be achieved
without significant increase in dark spectra (if
cooled to minimum temperature only)
Note: If the ambient temperature changes significantly (> 5
o
C), the user should employ the “Correct for
Electrical Dark” feature in OOIBase32 Spectrometer Operating Software. The "Correct for Electrical Dark"
function compensates for ambient temperature changes that shift the analog signal by several counts.
This "shifting" is an electrical effect due to changing voltage references. The shifting is not optically
related. Ambient temperature changes of 5 °C typically produce a shift of the entire spectra of 5-10
counts.
Pinouts
The TR2 interfaces to the S2000 using the H1 and H2 connectors. The pin-out for these signals is show below. In
addition, the TR2 has a J3 connector that communicates the various temperature signals. The J3 pinouts are
shown below.
When Multiple S2000-TR2 assemblies are stacked together, several signals in the J3 connector need to be
connected between all of the TR2 boards in the stack. The table below defines these signals. In this setup, the
display only shows the actual and set-point temperatures from a single unit. Typically, this unit is the Master
Spectrometer Channel.
