Appendix 9 Frequently Asked Questions
A20
How to minimize thermocouple
measurement error when moving
the HiLogger between places with
much different temperatures?
For thermocouple measurements, ter-
minal temperature is measured by an in-
ternal sensor to provide reference
juncti
on compensation. When the ambi-
ent temperature changes abruptly, or
when a
ir blows directly on the terminals,
errors occur due to thermal imbalance
between the terminals and temperature
sensor. When the HiLogger is moved to
a location with significantly different am-
bient temperature, allow at least 60 min-
utes for thermal equalization before
measuring.
"Instrument Installation"
(p .6)
When connecting a thermocouple
directly to the HiLogger, should
reference junction compensation
be set to external (EXT) or internal
(INT)? How is accuracy affected?
Select INT when connecting a thermo-
couple (or compensating leads) directly
to t
he HiLogger. Overall measurement
accuracy is the sum of the accuracies of
the thermocouple and the reference
junction compensation (RJC).
Example: when measuring 0 to 100C
with a K 100C f.s. thermocouple
For ±0.6C thermocouple accuracy and
±0.5C RJC accuracy, temperature
measurement
accuracy is ±1.1C.
"Temperature Mea-
surement Settings (us-
ing thermocouples)" (p
.56)
How to display only CH1 to CH3?
Select only the channels to be used on
the Input Channel Settings display. To
acquire data without displaying it, select
× as the waveform display color.
"Input Channel Set-
tings" (p .53)
"Selecting Waveform
Display Color" (p .65)
I want to measure motor tempera-
ture. How can I display the differ-
ence between ambient and
me
asured temperature in real
time?
Use the waveform calculation function.
Calculates and displays the waveform
of the real-time sum, difference, prod-
uct, or quotient of values measured on
two channel
s.
"7.3 Waveform Calcu-
lations" (p. 149)
How can I acquire maximum, min-
imum, and average values every
hour?
"Interval Calculation" calculates and dis-
plays the latest results after each inter-
val.
TXT format data can be saved to remov-
able storage in real time.
"7.1 Calculate Aver-
age, Maximum, Mini-
mum, and Etc." (p. 143)
I am measuring humidity with a
converter that converts 0 to 100%
RH to 1 to 5 V. How can I read hu-
midity directly?
Set the scaling method to [2-pt], and en-
ter the values.
(1:1 conversion 0, 2:5 conversion
100, units: %RH)
"3.6 Scaling Settings
(as needed)" (p. 69)
Question
Remedial Action
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