Data Sheet

3
Operation of the memory recorder functions
The input signal is converted*
1
to digital data that are stored
in the internal memory. The data can then be displayed on
the screen or printed out on paper*
2
. Once recorded, data are
backed up for five years by the internal battery, provided that
the start button is not pressed a second time (trigger mode: one-
shot). The necessary parts can be searched out on the screen so
that only the required waveforms are printed out*
2
.
*
1
The data sampling speed (sampling rate) is automatically set at 1/80 of the
time axis range. E.g., at 200 µs/division the sampling rate is 2.5 µs, at 5
minutes/division, the sampling rate becomes 3.75 sec.
*
2
The optional PRINTER UNIT 8992 is required.
■ Re al-time wave f orm judgement tr igger with const ant
monitoring of the voltage waveforms of AC power lines
(Memory recorder function only)*
6
The waveform judgement trigger constantly monitors the AC power
line for irregular waveforms. There are two ways to use this trigger.
One cycle of measured waveforms is observed with the judgement area
automatically created from the immediately preceding cycle waveform, or
the judgement area can be automatically created from the ideal sine wave.
In both cases, the trigger activates when the signal is detected to move
outside the reference area. This allows real-time monitoring of phenomena
in AC power lines that existing level triggers have not been able to
capture, such as momentary stops, sags, and impulses.
The level trigger can be set separately for each analog channel.
Also, when the printer is connected, the judgment area automatically
generated from the ideal sine wave can be printed as an overlay with the
measurement waveform.
*
6
The time axis can be used for all ranges above 10 ms/DIV (version 2.20 or later).
■ Example of abnormal
waveform recording
Waveform captured using the voltage-drop detection
trigger. This allows recording of the waveforms of
momentary voltage drops in power lines.
High-Speed Response for Capturing Transient Events
- Memory recorder function -
CH 1
Input voltage
A/D
conversion
A/D
conversion
Insulation
Insulation
High-speed writing
to internal memory
Display on color LCD
Storage on PC card
Waveform data
High-speed sampling of analog waveforms
Input voltage
Sampling period
Time
Printing on thermal printer
(option)
Transmission via
RS-232C
CH 4
Input voltage
Real-time waveform judgement trigger
Momentary
stop
Sag
Impulse
Drop
Sag
Impulse
Pattern comparison
Momentary stop
Voltage drop trigger Logic pattern trigger
Real-time waveform
judgement trigger
External
trigger
Timer trigger
Manual
trigger
Window out
Window in
Level, RMS level trigger
Window in/out trigger
Analog CH1-2
Logic A-B
Trigger source
AND / OR
Analog CH3-4*
*8808 only
Trigger functions capable of monitoring all 4 channels*
3
For all of the measurement functions, including recorder and
memory recorder, triggers can be set on all 4 analog input
channels and the 8 logic input channels. In addition to a simple
level trigger based on comparison with a single voltage value,
the following trigger conditions are also available:
● Window in/out trigger based on comparison of 2 voltage values
● Voltage drop trigger for AC power lines*
4
● RMS level trigger based on rms values*
5
● Waveform judgment trigger*
4
monitoring the waveforms of AC power
lines in real-time
● Pattern trigger monitoring the ON/OFF condition of a logic signal
*
3
MEMORY HiCORDER 8808-01. 2 channels in the case of the MEMORY HiCORDER 8807-01.
*
4
Memory recorder function only. For 50/60 Hz only.
*
5
RMS recorder function only. For 50/60 Hz only.
Level crossing
Time axis
Sampling
period
1-channel setting
256 kW/ch 3200 divisions
4-channel setting
64 kW/ch 800 divisions
200µs/DIV 2.5 µs 640 ms 160 ms
400µs/DIV 5 µs 1.28 s 320 ms
1ms/DIV 12.5 µs 3.2 s 800 ms
2ms/DIV 25 µs 6.4 s 1.6 s
5ms/DIV 62.5 µs 16 s 4 s
10ms/DIV 125 µs 32 s 8 s
20ms/DIV 250 µs 1 m 4 s 16 s
50ms/DIV 625 µs 2 m 40 s 40 s
100ms/DIV 1.25 ms 5 m 20 s 1 m 20 s
200ms/DIV 2.5 ms 10 m 40 s 2 m 40 s
500ms/DIV 6.25 ms 26 m 40 s 6 m 40 s
1s/DIV 12.5 ms 53 m 20 s 13 m 20 s
2s/DIV 25 ms 1 h 46 m 40 s 26 m 40 s
5s/DIV 62.5 ms 4 h 26 m 40 s 1 h 6 m 40 s
10s/DIV 125 ms 8 h 53 m 20 s 2 h 13 m 20 s
30s/DIV 375 ms 1 day 2 h 40 m 6 h 40 m
1min/DIV 750 ms 2 days 5 h 20 m 13 h 20 m
2min/DIV 1.5 s 4 days 10 h 40 m 1 day 2 h 40 m
5min/DIV 3.75 s 11 days 2 h 40 m 2 days 18 h 40 m