Hioki LR8431, Instruction Manual

Page: 190 / 204

Appendix 10 Frequently Asked Questions
A
32
When connecting a thermo-
couple directly to the HiLog-
ger, should reference junction
compensation be set to exter-
nal (EXT) or internal (INT)?
How is accuracy affected? Select INT when connecting a ther-
mocouple (or compensating leads)
directly to the HiLogger.
Overall measurement accuracy is
the sum of the accuracies of the
thermocouple and the reference
junction compensation (RJC).
Example: When measuring a tem-
perature from -100

C to 1,300

C
with a K thermocouple
The measurement accuracy is
±
1.5

C, obtained by adding the ref-
erence junction compensation accu-
racy of
±
0.5

C to the temperature
measurement accuracy of
±
1.0

C.
"Temperature Mea-
surement Settings"
(p.51)
How to display only CH1 to
CH3? Select only the channels to be used
on the Input Channel Settings dis-
play. To acquire data without dis-
playing it, select
×
as the waveform
display color.
3.4, "Setting Configu-
ration 2 – Input Chan-
nel Settings" (p.49)
"Selecting Waveform
Display Color" (p.56)
I am measuring humidity with a
converter that converts 0 to
100% RH to 1 to 5 V. How can I
read humidity directly?
Set the scaling method to
[2-pt]
, and
enter the values.
(1:1 conversion

0, 2:5 conversion

100, units: %RH)
"Converting Units
(Scaling function)"
(p.58)
Triggering
Question Remedial Action Reference page
Why does measurement not
start when "Wating for trigger"
is displayed? Triggering is enabled. To start re-
cording immediately with the
START
key, disable all trigger crite-
ria or the trigger function on the
[Trig
& Alm] screen.
4.3, "Confirming Trig-
ger and Alarm Crite-
ria Settings (List)"
(p.75)
How to acquire data before a
trigger?
Enable pre-triggering to acquire
data before trigger events. "Setting Criteria for
Pre-Trigger Record-
ing (Pre-Trig)" (p.72)
Question Remedial Action Reference page