YOKOGAWA DL350 - Connecting Thermocouples

2-43
IM DL350-03EN
Making Preparations for Measurements
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App
Index
2.13 Connecting Thermocouples
Connecting Thermocouples
If you are connecting the compensation lead of the thermocouple to the input terminal (binding post
terminal) of the 701261 (UNIVERSAL), 701262 (UNIVERSAL (AAF)), 701265 (TEMP/HPV), or 720266
(TEMP/HPV), loosen the terminal knob, pass the lead through the terminal, and tighten the knob.
L
H
Positive lead
Negative lead
To the thermocouple
Extension wires (or bare thermocouple wires)
WARNING
If over-range is indicated, the instrument may be receiving a voltage higher than the observed
waveform or measured waveform values. To prevent electric shock, check the input voltage
level.
Over-range indication
Indicates the number of the channel that over-range is occurring on
Channel indication when over-range is occurring on multiple channels
Indicates the smallest number among the channels that over-range is occurring on
CAUTION
• 701261 (UNIVERSAL), 701262 (UNIVERSAL (AAF)), 701265 (TEMP/HPV), or 720266
(TEMP/HPV) is isolated from the instrument. However, applying a voltage exceeding the
value below may damage the input section. If the frequency is above 1 kHz, damage may
occur even when the voltage is below this value.
Maximum input voltage (across the input terminals, H and L, at a frequency of 1 kHz or
less)
42 V (DC + ACpeak)
Maximum rated voltage to ground (across the input terminal L and earth at a frequency of 1
kHz or less)
42 V (DC + ACpeak) (CAT II, 30 Vrms)
• Correct measurements cannot be obtained when the positive and negative thermocouple
leads are connected in reverse.
• Immediately after connecting the thermocouple, the heat balance may be disturbed at
the input terminal section and may cause measurement errors. Therefore, wait about 10
minutes before making a measurement.