1523, 1524 Reference Thermometer
Using Clamp-On Ferrites
4
1.4.2.2 For Use As a Benchtop Instrument (AC Adapter)
The instrument was tested to Immunity Requirements for Controlled EM Environ-
ments. Utilized in this state the instrument is designed to operate in a controlled
electromagnetic environment. The instrument experiences degradation in the presence
of strong elds in the frequency range of 150 to 200 MHz and we suggest that it not be
used in close proximity to VHF transmitters.
1.4.3 Locking out non SI units
Through a specic key-press sequence, the user can choose to disable the °C °F toggle
switch so that temperature is displayed in SI units only. Once the units toggle switch
has been locked, subsequent key presses will not allow temperature to be displayed in
°F.
Instructions for locking out non SI units (see illustration below)
1. Simultaneously press and hold down the °C °F key and the BACKLIGHT key,
press the POWER ON key
2. The display will read: SI units only ON
3. Release the °C °F and the BACKLIGHT key
4. The °C °F key will no longer toggle between units
Figure 1
Press
Display reads:
SI units only ON
°
C
°
F
Press and hold
+
°
C
°
F
Release
+
Locking out non SI units
Repeating the steps above will enable the °C °F toggle switch allowing temperature to
be displayed in °F. The display will read: SI units only OFF
1.5 Using Clamp-On Ferrites
Clamp-on ferrites are provided for use in improving the instrument’s electromagnetic
(EM) immunity in environments of excessive EM interference, like areas of heavy
industrial equipment. We recommend placing the ferrites on the cables of probes at-
tached to the instrument.
To attach a ferrite to a probe cable, make a loop in the cable near the connector and
clamp the ferrite around half of the loop as shown in the diagram. The ferrite can be
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