Hioki LR8400-20, Инструкция по эксплуатации

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Appendix 9 Frequently Asked Questions
A
21
Appendix
Triggering
Question
Remedial Action
Reference page
Why does measurement not start
when "Wating for trigger" is dis-
played? Triggering is enabled. To start recording
immediately with the
START key, dis-
able all trigger criteria or the trigger func-
tion on the
[Trig & Alm] screen.
"5.3 Confirming All
Trigger and Alarm Cri-
teria Settings" (p. 116)
How to acquire data before a trig-
ger? Enable pre-triggering to acquire data
before trigger events. "Setting Criteria for Pre-
Trigger Measuring
(Pre-Trig)" (p .110)
How to acquire data only when an
external signal is HIGH? Apply the external signal to the
EXT.TRIG terminal, and set as follows:
[Ext trig] - [Start] :
↑
(Rising), [Stop] :
↓
(Falling)
Data will now be acquired only when the
external signal is HIGH.
"Using External Trig-
gering" (p .108)
How can I acquire data continu-
ously starting on 1/4/2010, daily
from 9:00 to 17:00, for one
month? Set as follows:
Measurement Criteria
[Interval] - [Cont] : Off, 8 hr 0 min 0 s
[Repeat] : On
Timer
[Start] : On, 10 Year, 4 Mon, 1 Day, 9
Hour 0 Min 0 Sec
[Stop] : On, 10 Year, 5 Mon, 1 Day, 9
Hour 0 Min 0 Sec
[Interval] : On, 1 Day, 0 Hour 0 Min 0
Sec
"3.2 Configuring Mea-
surement Settings" (p.
52)
"5.4 Periodic (Timer)
Measurements" (p.
117)
Is it possible to measure on 120
channels using two synchronized
HiLoggers? Measurement start can be synchronized
using an external trigger. Sampling can-
not be synchronized. "9.4 Synchronous
Measurements with
Multiple HiLoggers" (p.
166)
Measuring
Question
Remedial Action
Reference page
What should I do about zero off-
set when the input is shorted? Execute zero adjustment to compen-
sate for offset when the inputs are short-
ed. "2.7 Compensating for
Input Circuit Offset (Ze-
ro Adjustment)" (p. 50)
Even though a signal is only input
on CH1, why do similar wave-
forms appear on unused chan-
nels? An open-circuit input terminal can be af-
fected by signals on other channels. By
closing the input terminal circuit, normal
measurement is possible. If this is im-
practical, disable unused measurement
channels, or short the + and - terminals
together.
Why does it seem that measure-
ment fluctuations are larger on
UNIT2 than on UNIT1? A larger number of channels (input
units) raises the cut-off frequency for a
specific recording interval, and weakens
noise suppression. "3.8 Suppressing
Noise (Enable Digital
Filtering)" (p. 75)