User`s guide

RIGOL Chapter 2 Front Panel Operations
2-30 M300 User’s Guide
 Precision
After setting the temperature sensor type to TC, use the up/down direction
keys to select Precision and use the left/right direction keys to select “1”
or “0.1”.
 T/C Check
The T/C Check (Thermocouple Check) function checks whether the TC is
connected correctly. After setting the temperature sensor type to TC, enter
the fourth step of the channel configuration guide, use the up/down
direction keys to select T/C Check and use the left/right direction keys to
select “ON” or “OFF”. When “ON” is selected, the instrument measures the
channel resistance (in the 20 kΩ range) automatically after each
thermocouple measurement to ensure a proper connection. If an open
connection is detected (greater than 5 kΩ), the instrument displays “OPEN
T/C”.
 Reference Source
Thermocouple measurements require a reference junction temperature.
After setting the temperature sensor type to TC, enter the fourth step of the
channel configuration guide, use the up/down direction keys to select Ref
and use the left/right direction keys to select “Fixed”, “Internal” or
“External”.
a) Fixed: select a fixed reference temperature. Then use up/down
direction keys to select Fixed and use the numberic keyboard to input
desired temperature. The range is from -20℃ to 80℃ (always specify
the temperature in ℃ regardless of the temperature units currently
selected). Using this type of reference source, you can obtain the
highest measurement precision.
b) Internal: select an internal isothermal reference temperature on the
module. Using this type of reference source, you will obtain the lowest
measurement precision.
c) External: before selecting external reference, please find the first
module which supports temperature measurement function from Slot1.
Then configure the first channel of this module to perform a
temperature measurement function. The selected type can be THER,
RTD or RTD 4W. Otherwise, you can not select external reference for
other channels. This channel is then reserved as the reference source.
At this point, you can select other external eferences for other channels.
If this channel is deleted or its function is modified, the channels taking
this channel as reference source will revert to the internal reference
automatically.
4 Use thermistor to measure temperature
A thermistor is made up of material of which the resistance changes with
temperature and it converts temperature variation information to resistance