SRS Labs CTC100, User Manual

Page: 27 / 177

Operation 15
CTC100 Programmable Temperature Controller
iate calibration curve.
If the sensor reading does not appear
The sensor reading is blank whenever it falls outside the limits of the calibration data or input
circuitry. Normally, a blank reading means that no sensor is connected. If a sensor is in fact
connected but the reading is still blank, try the following steps:
1. Ensure that the sensor is correctly connected. At a minimum, the sensor must be connected
to the +I and I pins.
2. Measure the resistance of the sensor with an ohmmeter to ensure that one of the wires is not
broken.
3. Bring up the channel setup screen for the input channel and check the following settings:
Sensor: must agree with the type of sensor that is in use.
Range: set to Auto or, i
larger than the sensor
resistance.
Current: Forward, Reverse, or AC. If the current is off, no sensor reading will appear.
Cal Type: must agree with the type of sensor that is in use.
Cal R0: for RTDs only; must agree with the type of sensor that is in use.
4. G
. Now the reading will
appear in ohms or volts instead of degrees. Is the value correct?
a custom calibration table, make sure that the sensor resistance or voltage is
within the range of the calibration table.
6. If reading in ohms is incorrect, remove the sensor and
instead connect a resistor of about the same value to the CTC100. If the reading is still
incorrect, the unit may need to be returned to SRS for recalibration.
P lot data
The CTC100 Channels howing. This screen has one button for
each input and output connector on the back panel of the instrument. The locations of the buttons
on the screen roughly correspond to the locations of the connectors on the back panel. In addition
there are buttons for three virtual channels, V1 V3, that do not correspond to back-panel
connectors.
To plot data:
1. On the Select screen, touch the buttons to highlight the channels that you want to plot.
2. Press the Show Data key on the CTC100
The Show Data screen has four blue tabs at the top that control the type of display:
Single: all selected channels are plotted together on a single graph.
Multiple: each selected channel is plotted in its own graph.
Ponytail: all selected channels are plotted together on a single graph, and the traces are
offset such that each channel starts at zero.
Custom: selected channels are assigned to plots with
screen, described on page 67.
Numeric: a numeric value is displayed for each selected channel.