Page 44 · 5400 Series TECSource User’s Manual
4-Wire Measurement
For the best performance in accurate voltage measurement, the TECSource
supports remote voltage measurement for the TEC using a 4-wire Kelvin
connection. To use remote TEC voltage sense, wire pins 2 (+) and 9 (–) to the
corresponding terminals as close to the TEC module as is reasonable.
To enable the remote TEC voltage sense function, change Advanced Menu » 4-
wire VTE to Yes. The voltage indicated on the display will now be measured
through pins 2 and 9 instead of TEC+ and TEC- at the instrument. When 4-wire
VTE is enabled, the Cable R setting is ignored.
Analog Output
The Analog Output provides an adjustable, bi-polar voltage output controlled
user-selected functions. The output can used as a control input to another
instrument, data logged or simply monitored as a process variable.
The voltage can be controlled using one of the following functions, as set in the
Analog Out » Func menu item.
Direct – with this function, the analog output voltage can be directly
controlled to a specific value. A second menu item, Analog Set, will
appear, and the voltage can be adjusted from -5V to +5V, and the
corresponding voltage will be generated.
T Error – with this function, the analog output voltage is proportional to
the temperature error (actual minus set point). When set to this
function, a second menu item, T Error, will appear to control the
transfer function of temperature error to output voltage. T Error is in
°C/V. The output function looks like this:
For example, if the actual temperature was 25.4°C, and the set point
CAUTION
Do not confuse remote TEC voltage sense with the
remote sensor input (pins 10 & 11 on the 17W2
connector), as they are two very different functions, and
crossing their functionality could damage the instrument
or the mount.
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