Quick Start Guide

Appendix 3 Common Questions
A7
Read this when you want to perform a certain task, or when the procedure for a
particular operation is unknown.
Refer to "7.1 Troubleshooting" (⇒ p. 81) if the display or operation seems
abnormal, or if damage is suspected.
Appendix 3 Common Questions
To Perform This Measurement
In this case Description Reference
Perform simultaneous mea-
surements with different sam-
pling rates
Set different sampling rates on Timebase 1 and Time-
base 2 from the Status screen of the Memory function,
where Timebase 1 or Timebase 2 can be selected for
each channel.
"4.2.3 Setting Different Sam-
pling Rates" in the Instruction
Manual
To send a warning when an
anomaly occurs
When a trigger is applied, a signal can be output from
the External I/O terminals.
"14.2.2 Trigger Output (TRIG
OUT/CAL)" in the Instruction
Manual
To use multiple recorders
Recording with multiple instruments can be performed
using the external control connectors.
"14.2.1 External Trigger Input
(EXT TRIG)" and "14.2.2 Trig-
ger Output (TRIG OUT/CAL)" in
the Instruction Manual
What happens to measure-
ment data when power to the
instrument is lost during mea-
surement?
Measurement data acquired prior to the power interrup-
tion is lost.
When [Auto-Resume] is enabled from the Environment
Settings Screen of the System Screen, recording
resumes automatically when power is restored. How-
ever, this action differs according to trigger settings.
(Default setting: [Off])
"12.2.2 Using the Auto-Resume
Function (Resume After Power
Restoration)" in the Instruction
Manual
To measure shock when
dropping a test object, and to
search for the vibration reso-
nance point.
Use an acceleration sensor with the Model 8947 Charge
Unit to measure vibration and shock.
To record actual effective
(true RMS) values of mains
voltage
True RMS values can be recorded using the Model 8959
DC/RMS Unit.
To record anomalous waveforms, enable level triggering
to acquire waveforms when the RMS voltage drops.
Example. Trigger: Level, Level: 90 V, Slope: ↓ (Falling)
To monitor 120 V (50 or 60
Hz) power for a drop to 80%
or lower
Using a voltage measuring input module, enable trigger-
ing upon voltage sag.
To observe instantaneous
power dropouts on 120 V (50
or 60 Hz) commercial mains,
and the internal voltages of
affected devices.
Measurements can be made by the combination of a
voltage measuring input module and a clamp with con-
nection cable. Changes in commercial power, changes
in internal voltage of devices and changes in current flow
to devices (using a clamp-on sensor) at the instant of
power dropout are recorded on separate channels, and
analyzed. By splitting the screen, power and device-volt-
age waveforms can be displayed in separate traces.
Split-Screen Display:
"7.2.1 Assigning Display Data
to Sheets" in the Instruction
Manual
To observe surge noise on
240 V (60 Hz) AC mains.
AC mains and surge waveforms can be measured simul-
taneously. Surge noise can be detected by the slope trig-
ger. Acquired waveforms can be analyzed by expansion
and zooming.