WIKA operating instructions, model CTH7000
EN
23
08/2020 EN/BG
4. Design and function
4.3.2.1 Selecting the thermometer input channel and different mode [A/B key]
The channel
Select
key [
A/B
] is used to change between channels and also to select the
differential mode (
A – B
). The channel selection order is.
Channel A
⇒
Channel B
⇒ Channel (A-B)
⇒
Channel A
A missing probe will be indicated on the display by a series of dashed lines.
In differential mode (when both channel A and channel B have probes connected), the
screen will look similar to the following example. The asterisk next to the ChA and ChB
legends will alternate as readings are updated.
1
Individual channels readings
2
Probe conversion for current channel
3
Different mode indicator
The probe conversion indicator (bottom-left) displays the conversion method for the
current reading (and so will alternate if the two channels have different conversion
methods).
4.3.2.2 Selecting relative temperature measurement [0 key]
The instrument displays a reading value relative to a fixed offset in Zero (or relative)
mode. Press the
Zero
[
0
]
key to select this mode.
In zero mode, the instrument stores the last reading (at the time of
Zero
key press) to
subtract from all subsequent readings. It continues doing this until it is either cancelled by
pressing the
[Zero]
key again or until power is removed.
1
3
2
1
3
2
