If Thermocouple Measurement Range is Exceeded, or
when a measured value far exceeds the range limit
(range label)
• Example: Using a type T thermocouple with range -200 to +400°C
When a measured value exceeds the measurement range of the
thermocouple and far exceeds the range limit (range label), the
waveform saturates at the top of the screen, as shown at the right.
• When a measured value far exceeds range limit (range label),
"OVER" or "-OVER" is displayed in place of numerical/cursor val-
ues, and the following values are applied to calculations and data
storage.
• With burn-out detection enabled, burn-out is detected when mea-
surement input exceeds the range of the thermocouple, and far
exceeds the selected measurement range.
Input type Input range +OVER value -OVER value
Thermocouple
(Tc)
100C 327.67 -327.68
500C 1638.4 -1638.4
2000C 3276.7 -3276.8
[C]
1000
400
0
-200
-1000
About Burn-Out Detection
• When burn-out detection (Burn Out) is enabled (On), a tiny sensing current is applied during each
recording interval during thermocouple measurements to detect broken wires.
• Detection current is timed to avoid affecting measured values.
• For a specific recording interval, the filter cut-off frequency is higher when burn-out detection is
enabled, so noise suppression is less effective.
See:"Chapter 11 Specifications": "Cut-off frequency" (p .237)
• When measuring the temperature of the range's +f.s., the wire is considered to be broken when
the thermocouple resistance exceeds nearly following values. When burn-out detection is en-
abled with extended thermocouple wires, be sure that the wire diameter is sufficient.
Unit:
For example, measurement in the 100
C range with a K-type thermocouple and 0.32 mm diameter
wire extended beyond about 20 meters is detected as a burn-out.
Range
100Cf.s. 500Cf.s. 2000Cf.s.
Thermocouple
K 260 5400 4370
J 470 4150 1630
E 1520 7400 390
T 220 5440 5440
N 520 1470 590
R9040880
S90801300
B
2090
W 220 910 3090
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