Hioki 8870-20 User manual

MEMORY HiCORDER

Measurement Guide

8870-20

October 2013 Revised edition 4 8870B980-04 13-10H

Introduction

Thank you for purchasing the HIOKI "Model 8870-20 Memory HiCorder."

This Measurement Guide consists of some basic application examples. Before using

the instrument, be sure to read the Instruction Manual carefully.

Introduction

Operation and Screen

Types (p. 2) Describes the screen types and an overview of the

operating keys

Measurement Procedure

(p. 4) Describes procedures from measurement prepara-

tion to analysis

Commercial Power Mains

Measurement (p. 6)

Shows the method for recording 220 V commercial

mains waveforms, and describes how to save data

after measurement.

To Monitor for Abnormal

Phenomena (p. 8)

Describes how to record abnormal phenomena such

as voltage drop like those that occur during electrical

outages as an example type of phenomena.

Also describes continuous monitoring using the trig-

ger function to record only particular phenomena,

and automatic saving while measuring.

To Measure Current (p. 10) Describes how to record current waveforms using a

clamp-on probe, and how to use the scaling function

to display current values.

Analysis (p. 12) View and calculate waveform measurement values

using the A/B cursors.

Operation and Screen Types

Select the item to

change.

Show available

setting options.

Select the desired

setting.

Changing screen contents

CF Card Slot

Logic Connector

External control terminals

AC Adapter

Socket CHARGE LED

USB Port

POWER

Switch

Operating Keys

(Rear)

Battery

Compartment

Apply the new set-

ting,

or cancel it.

BNC Terminals

WAVE/DATA

Selects among waveform

screen displays (p. 3).

SET

Displays the Settings

screens, and switches

among the screen tabs with

each press (p. 3).

FILE

Displays file information

(p. 3).

GAUGE

Alternately displays and

hides the measurement

scale on the Waveform

screen.

(Manual trigger)

Press to trigger manually.

ESC

Cancels changes to set-

tings.

Cursor Keys

Moves the position

of the cursor (blink-

ing selection) on

the screen.

ENTER

Accepts displayed

settings.

KEY LOCK

Disables keypad

operations. Press

and hold the left

and right cursor keys simul-

taneouslyforthreeseconds

to lock and unlock the keys.

Press to save data manual-

ly (p. 7).

Press the center key to se-

lect waveform scrolling or

A/B cursor movement, then

press the left and right cur-

sor keys to scroll or move

(p. 12).

Setup and display

Saving operations

Scroll waveforms and

read cursor values

Choose a screen

Start and stop measure-

ment. The LED at the left

lights green while mea-

suring.

Start and stop

measurement

Operating Keys

Operation and Screen Types

The screen switches each time you press the key. Operational information is dis-

played along the bottom of the screen.

Waveform Screen Numerical Screen

Waveform/Numerical Screens

Settings Screens

Setting Screen Calc/Save Screen

Comment Screen System Screen

File Screen

Press the left/right

cursor keys to se-

lect between the

Settings screens.

Measurement Procedure

Before measuring, be sure to read the "Usage Notes" in the Instruction Manual.

Measurement Procedure

Install the battery pack (option)

Rear View

We recommend using the battery pack to provide backup during power outages,

and to preserve measurement data.

Connect the power cord

Top View

Connect the measurement cable

When using a logic probe

When using a connection

cable or clamp sensor

Top View BNC jack

Logic connector

Insert a CF card (option)

Top View

Confirm that sufficient free space

is available, and for auto-saving,

that a CF card is inserted before

measuring.

Turn the power on

Right Side View

Measurement Procedure

Connect to the measurement object

Configure settings for measurement

Select the Setting screen.

• Horizontal axis (Timebase)

• Recording length [Shot]

• Vertical axis (Voltage range)

[Rng/div]

Make other settings as

necessary.

Timebase setting

Settings for CH1

Settings for CH2

Settings for logic

measurements

To record repeatedly with the same

measurement settings:

Trigger mode: [Repeat] (default setting)

Start and finish measuring

Start

Measurement Stop

Measurement

To record once and stop automatically:

Trigger mode: [Single]

Analyze and save

Commercial Power Mains Measurement

This procedure records the voltage waveform of 220 V AC

(50/60 Hz) commercial power. The procedure for saving data

after measurement is also described.

In this case, the measurement criterion is specified by a

Level trigger setting.

To measure cyclic waveforms such as that of commercial

mains, the waveform can be best observed by establishing a

specific level as a starting point using Level triggering.

Commercial Power Mains

Measurement

1Prepare the following before measuring

Trigger level

Connect to the

measurement points

Items to prepare

Model 8870-20

AC Adapter (supplied)

Model L9198 Connection

Cord

CF Card

"Measurement Procedure"

(p. 4)

CF card

Connect to CH1

Connect to

power outlet

Turn the power on

2Configure measurement settings

Make the following settings on the Measurement Settings screen. 1

How to select the timebase

The timebase can be calculated from the frequency and period: f[Hz] =1/t[s] (where fis the fre-

quency and tis the period)

Example: if the measurement frequency is 50 Hz

50 [Hz] = 1/t[s], so t= 1/50 [s] = 0.02 [s] = 20 [ms]

To display five cycles on the screen (which is 20 divisions wide), select the timebase setting

closest to the value calculated as follows: 20 [ms] 5/20 [div] = 5 ms/div.

[Timebase]

Set the time per divi-

sion on the horizontal

axis for viewing the

waveform.

The default settings for the

non-framed items can be

left as-is.

Change as needed.

Select

Apply

[Rng/div]

Setthe voltage perdi-

vision on the vertical

axis.

[Mag] Vertical Axis Magnification

Set the zoom to x1/2 when measur-

ing from 200 to 240 V AC commer-

cial power line.

Commercial Power Mains Measurement

In this case, we use the default [Select & Save] method to save waveform data.

Refer to "Analysis" (p. 12) for analysis methods.

3Start and stop measurement

Press the START/STOP key.

“Waiting for trigger” is displayed until the signal

rises above zero volts.

When the measurement criteria are met, trigger-

ing occurs and the waveform is recorded for the

specified duration (Recording Length).

Trigger level

0 V

Trigger slope [ ]

In this case, measurement data is 

recorded until you press the START/

STOP key again.

Waiting for trigger

4Save the data

Displays the Save

dialog.

• To reload data into the instrument or

load it into the Wave Processor pro-

gram, set the Format to Binary.

• To save a screen image (Screen

Shot), display the screen to save, and

press the SAVE key to display the

Save dialog.

• You can confirm the saved data on the

File screen by pressing the FILE key.

(p. 15)

Select

Apply

To Monitor for Abnormal Phenomena

This procedure is a method for recording occurrences of volt-

age drop-out phenomena such as occur in a power outage.

During continuous monitoring, measurement data is saved

automatically.

This is an example to record power outage by using voltage

drop trigger. This procedure causes a trigger event when

voltage drops from about 220 Vrms (311 Vpeak) to 198 Vrms

(280 Vpeak) on a 50 Hz commercial power input signal.

To Monitor for Abnormal

Phenomena

1Prepare the following before measuring

Trigger LevelT

½Cycle

Connect to the

measurement points

Items to prepare

Model 8870-20

AC Adapter (supplied)

Model L9198 Connection

Cord

CF Card

"Measurement Procedure"

(p. 4)

CF card

Connect to CH1

Connect to

power outlet

Turn the power on

2Configure measurement settings

With pre-triggering, you specify that waveform recording is to begin just prior

to the occurrence of an anomaly like a momentary interruption.

Pre-triggering is set by specifying the percentage of the overall waveform re-

cording length to be recorded before the trigger point. (For this example,

record 10 divisions of the waveform before any momentary power drop-outs.)

The trigger point is set to 10 divisions of a total recording length of 20 divi-

sions, so set the pre-trigger to 10/20 [div] 100 = 50 [%].

50%

20 div

(Recording length)

50%

Select

Apply

Make the following settings on the Measurement Settings screen.

[Timebase]

Set the time per divi-

sion on the horizontal

axis for viewing the

waveform.

[Rng/div]

Set the voltage per di-

vision on the vertical

axis.

[Mag] Vertical Axis Magnification

Set the zoom to x1/2 when measur-

ing from 200 to 240 V AC commer-

cial power line.

The default settings for the

non-framed items can be

left as-is.

Change as needed.

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