Graphtec GL840 Midi Logger Quick Start Guide

This guide provides basic operations for the Graphtec GL840 Midi Logger. For in-depth information, refer to the USER'S MANUAL (PDF) on the CD-ROM.

Accessories Included

Quick Start Guide
Ferrite core
AC cable/AC adapter
CD-ROM

Before use, check the exterior of the unit for any cracks or damage.

Nomenclature

Top Panel

Analog signal input terminals: Standard terminal (B-564) and Withstand High Voltage high-precision terminal (B-565).

Power jack for humidity sensor: For optional humidity sensor (B-530).

Wireless LAN connection terminal: For optional wireless unit (B-568).

SD CARD2: Slot for SD memory card.

Front Panel

AC adapter jack: Connects to the AC adapter.

External input/output terminals: For LOGIC/PULSE, EXT TRIG/SAMPLE, ALARM, and input/output cables (B-513).

GND terminal: Ground connection.

Operation status LED: Indicates POWER, START, and CHARGE status.

GS sensor and terminal/adapter connection terminal: For optional sensors like temperature/humidity, acceleration, current, CO2, and illumination/ultraviolet sensors.

LAN interface terminal: For network connection.

USB interface terminal: For PC connection.

Monitor: Displays waveforms and data.

Control panel keys: For operating the device.

Power switch: Turns the unit on/off.

Bottom Panel

Battery cover: Accommodates two battery packs (optional B-569).

Tilt foot: For adjusting the unit's angle.

Label: Contains product information.

Connection Procedures

Connect the AC Adapter

Connect the DC output of the AC adapter to the "DC LINE" connector on the GL840.

Connect the Grounding Cable

Use a flathead screwdriver to push the button above the GND terminal while connecting the ground cable. Connect the other end to ground.

Connect to the Analog Input Terminals

Various input types can be connected:

Voltage input: DC voltage input.
Thermocouple input: Requires compensation wire if needed.
Resistance temperature detector input: Lead wire resistance should be 1Ω or less per wire, and all three wires must be the same length.
Current input: Requires a shunt resistor to convert current signals to voltage (e.g., 250-ohm resistor for 4-20mA to 1-5V conversion).

Caution: Connect wires to the specified channel number indicated on top of the terminal block.

Connect the External Input/Output Cable

The B-513 input/output cable (sold separately) is required for connecting input/output signals such as logic/pulse input, alarm output, trigger input, and external sampling pulse input.

Signal assignment:

Logic/pulse input: Orange (1, 2, 3, 4), Grey (1, 2, 3, 4), Pink (Trigger input/external sampling input)
Alarm output: Yellow (1, 2, 3, 4)
GND: Shielded

Internal Memory and SD Card

The internal memory is displayed as SD1 or SD CARD1 and is not removable.

Mounting SD CARD 2

To mount: Open the protective cover, insert the SD memory card until it clicks and is firmly placed. Ensure the SD card is unlocked.

To remove: Gently push the SD memory card to release it, then pull to remove.

Caution: Push the SD card gently before pulling to remove it. The POWER LED blinks when the GL840 is accessing the SD memory card.

Connect with PC

Using a USB cable: Attach the supplied ferrite core to the USB cable. The USB driver must be installed on the PC. Refer to the "USB Driver Installation Manual" on the CD-ROM.

Using A-type and B-type connectors: Connect the GL840 and PC using the appropriate cable.

Safety Guide for using GL840

Maximum input voltage of standard terminal (B-564)

Exceeding specified voltage can damage the input relay. Never input voltage levels exceeding the specified value.

Between +/- terminals(A): Max input 60Vp-p (20mV to 2V ranges), 110Vp-p (5V to 100V ranges).
Between Channel to channel (B): Max input 60Vp-p, Withstand voltage 350 Vp-p at 1 minute.
Between Channel to GND (C): Max input 60Vp-p, Withstand voltage 350 Vp-p at 1 minute.

Maximum input voltage of Withstand High Voltage high-precision terminal (B-565)

Exceeding specified voltage can damage the input relay. Never input voltage levels exceeding the specified value.

Between +/- terminals(A): Max input 60Vp-p (20mV to 2V ranges), 110Vp-p (5V to 100V ranges).
Between Channel to channel (B): Max input 600Vp-p, Withstand voltage 600Vp-p.
Between Channel to GND (C): Max input 300Vp-p, Withstand voltage 2300 VACrms at 1 minute.

Warm-up

The GL840 requires approximately 30 minutes for optimum performance.

Unused channels

To prevent impedance issues and noise fluctuations in unused analog input channels, set them to "Off" in the AMP setting menu or short the '+' and '-' terminals.

Noise countermeasures

To reduce fluctuations due to extraneous noise:

Connect the GL840's GND input to ground.
Connect GL840's GND to the measurement object's GND.
Operate with batteries (optional B-569).
In the AMP settings menu, set the filter to a setting other than "OFF".
Set the sampling interval to enable the digital filter (refer to the table below).

Sampling Interval Table:

Number of Measuring Channels	Allowed Sampling Interval	Sampling Interval which enables Digital Filter
1 Channel or less	10 msec or slower	50 msec or slower
2 Channels or less	20 msec or slower	125 msec or slower
5 Channels or less	50 msec or slower	250 msec or slower
10 Channels or less	100 msec or slower	500 msec or slower
11 to 20 Channels	200 msec or slower	1 sec or slower
21 to 50 Channels	500 msec or slower	5 sec or slower
51 to 100 Channels	1 sec or slower	10 sec or slower
101 to 200 Channels	2 sec or slower	10 sec or slower

* Number of Measuring Channels refers to active channels with input settings other than "OFF".

* Temperature measurements are not taken when the sampling interval is set to 50 ms or faster.

In the "OTHER" menu, set the commercial power frequency (50 Hz or 60 Hz).

Descriptions of the Control Panel Keys

CH GROUP: Switch between channel groups (10 channels per group).
SPAN/TRACE/POSITION: Adjust range, display, and position settings for individual channels. Use ▲/▼ to select channels and ◀/▶ to change values.
TIME/DIV: Change the time axis display range on the waveform screen.
MENU: Open setup menus (AMP, DATA, TRIG, I/F, WLAN, OTHER).
QUIT (LOCAL): Cancel settings and return to default status or local mode.
DIRECTION KEYS (◀/▶/▲/▼): Navigate menus, adjust span settings, or move cursors during data replay.
ENTER: Submit settings and confirm selections.
FAST FORWARD (KEY LOCK): Move cursor quickly during replay or change operation. Hold both keys for 2 seconds to lock/unlock keys. Password protection is available by pressing ◀ + ENTER + ▶.
START/STOP (USB DRIVE MODE): Initiate or stop recording. Switches to USB DRIVE mode when power is turned on with the key pressed.
REVIEW: Replay recorded data.
DISPLAY: Switch between waveform and digital display modes (Waveform + Digital, Full-screen Waveform, Digital + Calc).
CURSOR (ALARM CLEAR): Switch between cursors A and B during replay. Clear alarms if set to "Alarm Hold".
FILE: Operate internal memory (SD1), SD memory card (SD2), perform screen copy, and save/load settings.
NAVI: Access easy capture, easy trigger, and wireless LAN connection settings.

Descriptions of the Menu Screens

The screen displays various information:

Status message display area: Shows operating status.
Time/DIV display area: Shows current time scale.
Status mark: Indicates status (e.g., STOP, REC, PLAY).
Wireless sensor display: Shows wireless LAN connection status and radio field intensity.
Device access display (Internal memory/SD card 2/wireless LAN display): Indicates access to internal memory (SD1) or SD card (SD2).
Remote lamp: Shows remote status (Yellow = Remote, White = Local).
Key lock lamp: Shows key lock status (Red = locked, White = not locked).
Clock display: Shows current date and time.
AC/Battery status indicator: Shows AC power and battery operating status.
Waveform operation display area: Shows the mode selected by the SPAN/TRACE/POSITION key.
Digital display area: Shows input values for each channel.
Quick settings: Easily set parameters.
Alarm display area: Shows alarm output status.
Pen display: Shows signal positions, trigger positions, and alarm ranges.
File name display area: Displays the recording file name.
Scale lower limit: Displays the lower limit of the active channel's scale.
Waveform display area: Displays input signal waveforms.
Scale upper limit: Displays the upper limit of the active channel's scale.
Recording bar: Indicates remaining media capacity during recording or display position/cursor information during replay.

Measurement Procedure

The basic process is: Preparations -> Setup -> Record -> Replay.

1. Preparations: Hardware set up for Data Recording

Connect Thermocouple to CH 1 terminal (Temperature).
Connect wire to CH 2 terminal (Voltage).
Connect the AC power supply.
Turn the power supply on.

2. Setup: Menu Operation

Configure settings for used channels. Factory defaults are generally sufficient.

Basic Setup Menu Operation: Use ENTER, and QUIT keys. Use ▲/▼/◀/▶ keys to move the cursor and select items or input values.

Example: Voltage and temperature measurements

Push [MENU] key to display the setup menu.
Set Input to "TEMP" and Sensor to "TC-T" for CH1, and Range to "100°C".
Set Input to "DC" and Range to "1V" for CH2.
Set all other channels to "Off". Use [CH GROUP] to switch to other channel groups if needed.

3. Data record: How to Record

Start data recording: Push [START/STOP] key. Confirm with [ENTER].
Screen status during data recording: Progress is shown on the screen with elapsed time and remaining time.
Stop recording: Push [START/STOP] key. Confirm with [ENTER]. The GL840 returns to Free Running mode.

Recorded data can be viewed during recording by pressing the [REVIEW] key.

4. Data Replay: How to Replay Recorded Data

Selecting a file to replay: Push [REVIEW] key, select the data, move cursor to [OK], and press [ENTER].
Replay screen: Displays scroll bar, level display area, quick settings, time display, and cursor. Use keys to navigate and check values.

Push [QUIT] key to end data replay. The GL840 returns to Free Running mode.

Additional features

Trigger Functions to Control Recording Start/Stop Operations

Trigger functions control the timing of recording start and end.

Example: Start recording when CH1 temperature exceeds 20°C

Push [MENU] key and open the "TRIG" menu.
Set "Start Source" to "Level".
Push [ENTER] for "Level Settings".
Set the "Mode" parameter for CH1 to "H" and the "Level" to "20°C".
Move cursor to "OK" and push [ENTER].
Push [QUIT] to return to the TRIG menu.
Push [START/STOP] key to start recording. The unit will be in "Armed" status until the trigger condition is met.

Span, Trace and Position Functions to Adjust the Waveform Display

These functions adjust the waveform display without affecting recorded data.

How to change the Span setting: Adjusts waveform amplitude. Set span for CH 1 to 110°C.
How to change the Trace setting: Makes waveform visible or invisible. Set CH 1 to "On" or "Off".
How to change the Position setting: Adjusts waveform position. Set CH 1 position to "+90°C to -20°C".

Specifications

Standard Specifications

Item	Description
Number of analog channels	GL840-M or GL840-WV (20ch per terminal or max 200ch with extension unit)
External input and output functions	Trigger input/External sampling (1ch), Logic input (4ch), Pulse input (4ch), Alarm output (4ch)
PC interface	Ethernet (10BASE-T/100BASE-TX), USB (HighSpeed)
Built-in memory device	Internal memory (SD1): approx. 4GB, SD CARD2 slot (up to 32GByte)
Sampling interval	10ms/1ch MAX (GBD/CSV format), various intervals available
Back-up functions	Setup parameters: EEPROM/Clock (Lithium battery)
Clock accuracy	±0.002% (approx. 50 seconds per month)
Operating environment	0 to 45°C, 5 to 85%RH
Power supply	AC adapter (100-240 VAC), DC input (8.5-24 VDC), Battery pack (optional)
Power consumption	Various VA/A ratings depending on condition (LCD on, screen saver, recharging)
Display	7-inch TFT color LCD (WVGA800 × 480 dots)
Display language	Japanese, English, French, German, Chinese, Korean, Russian, Spanish
External dimensions (approximate)	GL840-M: 240 x 158 x 52.5 mm, GL840-WV: 240 x 166 x 52.5 mm
Weight (approximate)	GL840-M: 1,010g, GL840-WV: 1,035 g
Vibration-tested conditions	Equivalent to automobile parts Type 1 category A classification

External Input/Output Functions

Item	Description
Input specifications (pulse/logic, trigger/external sampling)	Max input voltage: 0 to +24V (single-ended), Input threshold voltage: approx. +2.5 V, Hysteresis: approx. 0.5 V
Alarm output specifications	Open collector output (5 V, 10 kΩ pull-up resistance)

Common specification of the terminal in the input section

Item	Description
Number of input channels	M3 screw type, 20 channels (max 200 with extension unit)
Method	Photo MOS relay scanning, isolated, balanced input
Measurement Voltage accuracy	Various ranges available (20/50/100/200/500 mV, 1/2/5/10/20/50/100 V, 1-5 V F.S.)
Temperature accuracy	Thermocouple: K, J, E, T, R, S, B, N, W (WRe5-26); Resistance temperature detector: Pt100, JPt100, Pt1000 (IEC751)
Humidity	0 to 100% (voltage 0 V to 1 V scaling conversion)
A/D converter	16-bit Delta-Sigma A/D converter
Temperature coefficient	Gain: 0.01% of F.S./°C, Zero: 0.02% of F.S./°C
Common mode rejection ratio	At least 90 dB
Noise	At least 48 dB

Specification of input section (GL840-M with standard terminal)

Item	Description
Measurement accuracy (23°C ±5°C)	Voltage: ±0.1% of F.S.; Thermocouple: Various accuracies based on type and temperature range.
When 30 minutes or more have elapsed after power was switched on	Sampling 1 s/20 ch, Filter ON (10), GND connected
Type	Measurement Temperature Range	Measurement Accuracy
T	0 to 100°C	±5.2°C
	100 to 300°C	±3.0°C
R/S	300 to 1600°C	± (0.05% of rdg +2.0°C)
	300 to 1760°C	± (0.05% of rdg +2.0°C)
	400 to 600°C	±3.5°C
B	600 to 1820°C	± (0.05% of rdg +2.0°C)
K	-200 to 1370°C	± (0.05% of rdg +1.0°C)
E	-200 to 800°C	± (0.05% of rdg +1.0°C)
T	-200 to 400°C	± (0.1% of rdg +0.5°C)
J	-100 to 1100°C	± (0.05% of rdg +1.0°C)
N	-200 to 1300°C	± (0.1% of rdg +1.0°C)
W	0 to 2000°C	± (0.1% of rdg +1.5°C)
Reference contact compensation accuracy	±0.5°C
Resistance temperature detector (3-wire system)	Type	Measurement Temperature Range	Applied current	Accuracy
Pt100	-200 to 850°C	1mA	±1.0°C
JPt100	-200 to 500°C	1mA	±0.8°C
Pt1000	-200 to 500°C	0.3mA	±0.8°C
Maximum input voltage	Between +/- terminals: 20mV to 2Vrange (60Vp-p), 5V to 100V range (110Vp-p)
Withstand voltage	Between input terminal/input terminal: 1 minute at 350Vp-p, Between input terminal/GND: 1 minute at 350Vp-p

Specification of input section (GL840-WV Withstand High Voltage high-precision terminal)

Item	Description
Measurement accuracy (23°C ±5°C)	Voltage: ±0.1% of F.S.; Thermocouple: Various accuracies based on type and temperature range.
When 30 minutes or more have elapsed after power was switched on	Sampling 1 s/10 ch, Filter ON (10), GND connected
Type	Measurement Temperature Range	Measurement Accuracy
T	0 to 100°C	±4.5°C
	100 to 300°C	±3.0°C
R/S	300 to 1600°C	±2.2°C
	300 to 1760°C	±2.2°C
	400 to 600°C	±3.5°C
B	600 to 1820°C	±2.5°C
K	-200 to 1370°C	±0.8°C
E	-200 to 800°C	±0.8°C
T	-200 to 400°C	±0.6°C
J	-100 to 1100°C	±0.6°C
N	-200 to 1300°C	±1.0°C
W	0 to 2000°C	±1.8°C
Reference contact compensation accuracy	±0.3°C
Resistance temperature detector (3-wire system)	Type	Measurement Temperature Range	Applied current	Accuracy
Pt100	-200 to 850°C	1mA	±0.6°C
JPt100	-200 to 500°C	1mA	±0.6°C
Pt1000	-200 to 500°C	0.3mA	±0.6°C
Maximum input voltage	Between +/- terminals: 20mV to 2Vrange (60Vp-p), 5V to 100V range (110Vp-p)
Withstand voltage	Between input terminal/input terminal: 1 minute at 600Vp-p, Between input terminal/GND: 2300 VACrms 1 minute

Installation Guide

For the installation procedure of the GL840 application software (USB driver / GL100_240_840-APS), refer to the "Application Software Manual" included in the attached CD-ROM.

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