Changing The Display; Performing A Measurement - TESTO 835 Mode D'emploi

7.3 Changing the display

Various combinations of three measurement parameters in each case can be shown on
the display.
Symbols on the display:
IR sensor, TC probe,
temperature difference
- The instrument is switched on.
Select the desired measurement parameter display with [
Display [unit]
Max | [°C/°F] | Min
| [°C/°F] |
[%RH] | [°C/°F] |
[%RH] | [°C/°F] |
Max | [°CDtd/°FDtd] | Min
Max | a [-] | Min
w
7.4 Measuring
Observe information on IR measurement (chapter 12)/contact measurement (chapter
13).
- The instrument is switched on.

Performing a measurement

The measurement (IR and contact measurement) is started by pressing the trigger.
Remove orange protective cap from the lens.
1 Continual measurement disabled: hold down the trigger.
- SCAN is displayed.
or
Continual measurement enabled: press trigger.
- CONT is displayed.
2 Lock in on measurement object (IR) or position thermocouple (contact
measurement).
- When laser is enabled: the laser points mark the measuring range for IR
measurement.
3 Continual measurement disabled: release the trigger to end the measurement.
or
Continual measurement enabled: press the trigger again to end the measurement.
- HOLD is displayed.
- The measuring values are kept until the next measurement.
ambient humidity / ambient temperature probe,
Measurement parameters / comments
Max. IR temperature | IR temperature | Min. IR temperature
TC temperature | IR temperature | Temperature difference TC minus IR View only
available when thermocouple probe is plugged in.
[°Ctd/°Ftd] Ambient humidity | IR temperature | Ambient dew point temperature View only
available in testo 835-H1.
[°Ctd/°Ftd] Ambient humidity | Ambient temperature | Ambient dew point temperature View
only available in testo 835-H1.
Temperature difference IR minus dew point max. | current | min. View only
available in testo 835-H1.
Surface moisture max. | current | min. Calculated from dew point of ambient air
and surface temperature. 0.00 to 0.64: non-critical / 0.65 to 0.80: potentially
critical / 0.81 to 1.00: critical. View only available in testo 835 - H1.
7. Operation
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