Overview
Enviro Test Construct Handheld AC Milliohm Meter with Four Terminal measurement is designed as low-resistance meter and a voltmeter with a wide resistance measurement range from 0.01 mΩ to 2 kΩ and is suitable for assembly line tests for all kinds of batteries. This meter comprises with m-Ohm and V mode that allows simultaneous measurement and comparison of battery internal resistance and open circuit voltage. It is equipped with Mini-USB RS232 interface which can be used for remote control, data acquisition and analysis. This meter adopts high performance 32-bit ARM processor.
Key Features
- Four Terminal Method
- Resistance measurement range from 0.01 mΩ to 2 kΩ
- DC Voltage range from 1 V to 50 V
- Maximum reading of resistance 2200 digits
- Maximum reading of voltage 5000 digits
- Built-in Mini-USB RS-232 interface
- 5 in (89 mm) 16M color TFT-LCD screen
- SCPI compatible command sets
- Keypad lock Function
- Data hold Function
- Auto power off
- 4 V Lithium 2200 mAh rechargeable battery
- Customizable beep feature
- Internal, External and Manual Trigger
- Short-circuit clear zero for all ranges
- ABS, PER and SEQ sorting methods
- Range Auto, Manual and Nominal mode
- Battery continuously works over 8 hours
Technical Specifications
| Parameters | AC resistance, DC voltage | ||
| Interface | Built-in USB, Charging Interface, U disc Interface | ||
| Signal Source | AC | 1 kHz | |
| Open Circuit Voltage | 30 mv | ||
| Current | 15 mA | ||
| Resistance Measurement Range | 0.01 mΩ to 2 kΩ | ||
| DC Voltage Range | 1 V to 50 V | ||
| Accuracy | Resistance | 0.5 % | |
| Voltage | 0.1 % | ||
| Maximum Display Digits | Resistance | 2200 digits | |
| Voltage | 5000 digit | ||
| Display Mode | TFT- LCD Mode | ||
| Input | 100 V to 240 V | ||
| Frequency | 50 Hz/60 Hz | ||
| Output | 9 V 1 A (DC) | ||
| Range | 6 ranges with Auto, Manual and Nominal Modes | ||
| Trigger Mode | Internal, Manual and BUS | ||
| Test Speed | 20 times/second | ||
| Hold Mode Speed Range | SLOW | 2 times/second | |
| MED | 10 times/second | ||
| FAST | 20 times/second | ||
| Auto Mode Speed Range | SLOW | 1.8 times/second | |
| MED | 6.8 times/second | ||
| FAST | 16 times/second | ||
| SCPI | Available | ||
| Baud Rate | 115200 bps | ||
| Weight | 22.3 oz. (650 g) | ||
| Dimensions | 5.13 in x 8.3 in x 1.5 in (130.23 mm x 210.76 mm x 37.88 mm) | ||
| Accurate Temperature | 73.4 ˚F ± 41 ˚F (23 ˚C ± 5 ˚C) | ||
| Accurate Humidity | ≤ 65 % RH | ||
| Warming Timing | >60 minutes | ||
| Adjustment Time | 12 months | ||
| Nominal Humidity | < 80 % RH | ||
| Working Humidity | 10 % RH to 90 % RH | ||
| Storage Humidity | 10 % RH to 90 % RH | ||
| Nominal Temperature | 59 ˚F to 95 ˚F (15 ˚C to 35 ˚C) | ||
| Operating Temperature | 50 ˚F to 104 ˚F (10 ˚C to 40 ˚C) | ||
| Storage Temperature | 32 ˚F to +122 ˚F (0 ˚C to 50 ˚C) | ||
Applications
- Internal resistance and voltage of the battery
- Alkaline batteries, Life assessment lead batteries
- UPS online measurement
- Batteries identification test
- Super capacitor ESR measurement
- Contact resistance
Main Functions
Correction:
Short-circuit clear zero correction for all ranges.
Comparator (Sorting Function):
Set up the sorting function for GN/DG sorting
Comparator methods:
- Absolute value of tolerance ± TOL sorting
- Percentage tolerance %TOL sorting
- Sequence comparison sorting
Beep Feature:
- Beep: OFF/GD/NG
- System Setup
- Keypad lock function
- Time and Date settings
- Language switch option
- Administrator account settings
- Background brightness settings
- Auto power off settings
Remote Control
Max baud rate: 115200 bps
SCPI available
ASCII transmit
Front Panel Summary:
Interfaces:
- USB Host port
- Mini-USB Slave Port
- Reserved Interfaces
- Power Adaptor
Replace Battery
The instrument has built-in rechargeable battery, the battery has been installed in the battery compartment of the instrument. Replace the battery according to the following procedure.
Adjust Support
The support has two positions:
60 degrees and 45 degrees
45 degrees makes the instrument more stable
Power Supply:
The instrument can be powered by Li battery. When the battery is low, power adapter is used to charge the battery.
Charge the battery
Use the power adaptor to charge the battery. The Power key is orange when charging the battery even the instrument is turned off. When the battery is full the indicator is out.
Power key is orange when charging.
Turn ON/OFF:
To turn ON/OFF the instrument press the power key.
Test Slots:
Insert the cable box into test slots.
Clips and cables:
Using the clips and cables of other brands may cause damage and after 1 to 2 years the surface of the accessories may get damaged which will leads to inaccuracy.
<MEAS Display> Page
Press [Meas] key to enter <MEAS DISPLAY> page.
The <MEAS DISPLAY> page includes following step:
- Trigger Mode [TRIGGER]
- Measurement Range [RANGE]
- Test Speed [SPEED]
- Comparator [COMP] ON/OFF
- [BEEP] Feature
- Soft key VIEW DATA – To enter [VIEWDATA] page
- Soft key SAVE DATA – To store Current Measurement Result into Internal Flash Disk
[TRIGGER]:
It includes three settings:
- Internal Trigger
- Manual Trigger
- BUS Trigger
Trigger Setting:
| Trigger | |
| Internal | Internal trigger |
| Manual | Press the [Enter] key once, the instrument runs a test cycle |
| BUS | The instrument runs a test cycle by receiving RS232 trigger command. |
Procedure to set the trigger:
| Step 1 | Press [Meas] key to enter <MEAS DISPLAY> page | |
| Step 2 | Use cursor keys to select [TRIGGER] field | |
| Step 3 | INT | Automatic Internal trigger |
| MAN | Manual trigger by pressing [Trig] key | |
| BUS | BUS trigger by RS232 SCPI command | |
Resistance [RANGE]
It has three range modes:
- AUTO range
- Manual range
- Nominal range
Resistance Ranges:
| Range | Description | Pros | Cons |
| AUTO | Automatically. Impedance range is automatically set by selecting the best range | Convenient | Test speed is slower than manual ranging |
| HOLD | The instrument will always use the user-specified range | Highest speed | Set the range initially |
| NOMINAL | Automatically Select the best range according to nominal value | Best mode for sorting | Only available in sorting mode |
Resistance Measurement Range:
| Range | Range Name | Measurement Range |
| 5 | 2 kΩ | 200 Ω ~ 2.2 kΩ |
| 4 | 200 Ω | 20 Ω ~ 220 Ω |
| 3 | 20 Ω | 2 Ω ~ 22 Ω |
| 2 | 2 Ω | 200 mΩ ~ 2.2 Ω |
| 1 | 200 mΩ | 0 mΩ ~ 22 mΩ |
Procedure of setting the range:
Procedure to set the trigger:
| Step 1 | Press [Meas] key to enter measurement page | |
| Step 2 | Use the cursor key to select [RANGE] | |
| Step 3 | AUTO | Auto range |
| HOLD | Current range is hold | |
| NOMINAL | Select the range according to resistance nominal value [ResNom] | |
| INCR+ | Increase range | |
| DECL- | Decline range | |
The DC voltage measurement range cannot be selected. Instrument always use automatic mode.
Test Speed:
SLOW, MED and FAST test speed can be selected.
Procedure to set test speed:
| Step 1 | Press [Meas] key to enter measurement range | |
| Step 2 | Use the cursor key to select [SPEED] field | |
| Step 3 | SLOW | |
| MED | ||
| FAST | ||
Comparator [COMP]
Set the comparator parameter in <SETUP> page and the page is about how to turn on/off the comparator.
| Step 1 | Press [Setup] key to enter measurement range | |
| Step 2 | Use the cursor key to select [COMP] field | |
| Step 3 | OFF | Comparator off |
| ON | Comparator on | |
[BEEP] Feature:
Procedure to set the beep
| Step 1 | Press [Meas] key to enter measurement range | |
| Step 2 | Use the cursor key to select [SPEED] field | |
| Step 3 | OFF | Turn beep off |
| GD | Beep while pass | |
| NG | Beep while fail | |
Icons on <MEAS Display>
| Icon | Description |
 | Powered by Li battery |
 | Powered by external power supply |
 | USB-Disk is available |
| H | Hold current data |
< SETUP> page
Press [Setup] key to enter <SETUP>page.
In <SETUP> page, if the testing is not progress the Instrument does not display the measurement result and comparator result.
The <SETUP> page includes following setup:
- Trigger Mode [TRIGGER]
- Measurement Range [RANGE]
- Test Speed [SPEED]
- Comparator [COMP] ON/OFF
- BEEP Feature
- Soft key CLEAR ZERO – Clear Zero Correction
- RESMODE – AC Resistance Sorting Methods
- VOLTCOMP– DC Voltage Sorting Methods
- ResNom – Input Resistance Nominal Value
- ResLow – Input Resistance Low Limit
- ResHigh – Input Resistance High Limit
- VoltNom – Input Voltage Nominal Value
- VoltLow – Input Voltage Low Limit
- VoltHigh – Input Voltage High Limit
Some settings can be also set up in <MEAS DISPLAY> page.
Short-circuit Clear Zero [CLEAR ZERO]
Press [Setup] key to enter < SETUP> page, and then press [CLEAR ZERO] soft key to do short-circle clear zero. Once it’s done with short-circuit clear zero the value will be saved into internal flash disk.
Note:
It is necessary to do short-circle clear zero. When replace the test fixture or test cables, it is must to do short –circle clear zero.
Connect the test clip as shown in the below figure.
RS232 [BAUD] rate
Connect the instrument to computer via Mini-USB to RS232 port and the instrument will communicate with PC, meanwhile the keypad will be locked. Use the SCPI language in Mini-USB programming.
Mini-USB to RS232 format:
- Data bits: 8
- Stop bits: 1
- Parity: none
| Step 1 | Press [SYSTEM] bottom soft key to enter <SYSTEM CONFIG> page | |
| Step 2 | Use the cursor key to select [BAUD] field | |
| Step 3 | 1200 | For the communication, converter opt with coupler isolation |
| 9600 | ||
| 38400 | ||
| 57600 | ||
| 115200 | Best for communication with PC | |
<SYSTEM INFORMATION>
| Step 1 | Press [Meas] or <Setup> key to enter main page |
| Step 2 | Press bottom soft key [SYSTEM] to enter <SYSTEM CONFIG> |
| Step 3 | Press soft key [SYSTEM INFORMATION] to enter <SYSTEM INFORMATION> page |
AC Resistance Range:
| Range | Max. Reading | Resolution | FAST | MED | SLOW | Test Current | |
| 0 | 20 mΩ | 22.00 mΩ | 0.01 mΩ | 0.8% ± 5 | 0.6% ± 3 | 0.5% ± 2 | 10 mA |
| 1 | 200 mΩ | 220.0 mΩ | 0.1 mΩ | 0.8% ± 4 | 0.6% ± 3 | 0.5% ± 2 | 1 mA |
| 2 | 2 Ω | 2.200 Ω | 1 mΩ | 0.8% ± 4 | 0.6% ± 3 | 0.5% ± 2 | 0.1 mA |
| 3 | 20 Ω | 22.00 Ω | 10 mΩ | 0.8% ± 4 | 0.6% ± 3 | 0.5% ± 2 | 10 µA |
| 4 | 200 Ω | 220.0 Ω | 100 mΩ | 0.8% ± 4 | 0.6% ± 3 | 0.5% ± 2 | 5 µA |
| 5 | 2 kΩ | 2.200 kΩ | 1 Ω | 0.8% ± 4 | 0.6% ± 3 | 0.5% ± 2 | 2 µA |
| Open-circuit Voltage: < 30 mVrms | |||||||
DC Voltage Range:
| Range | Max. Reading | Resolution | FAST | MED | SLOW | |
| 1 | 5.0000 V | 5.0000 V | 0.0002 V | 0.5 % ± 4 | 0.5 % ± 2 | 0.1 % ± 5 |
| 2 | 50.000 V | 50.000 V | 0.002 V | 0.5 % ± 4 | 0.5 % ± 3 | 0.1 % ± 5 |
