Tenmars TM-508A User manual

MILLIOHM METER

TM-508A

HB2TM508A001

User’s Manual

TENMARS ELECTRONICS CO., LTD

 
CONTENTS 
 
1Features ...................................................3 
2General specifications..............................3 
3Instrument description..............................5 
4Notice in prior to the testing......................6 
5Electrical specifications:...........................6 
6Measurement by the Four Wire type one 
pair of coated clip............................................7 
7Precise Impedance measurement............8 
8Battery Replacement................................9 
9Replacement of fuse ..............................10 
10 Maintenance and Care...........................10 
11 END OF LIFE .........................................11 

TM-508A

EN-3

1 Features

1. Very low impedance measurement by Four Wire

type one pair coated clip.

2. There is a fuse (0.5A/250V) to pro the input circuit.

3. Applicable measurement of Resistance, motor coil,

transformer, Printed Circuit Board.

4. Accurate measurement of conductor, light electricity

and welding point.

5. Wide measurement range, 0.1 mΩto 20kΩin 6

positions.

6. D –H Switch: Lockup readings for LCD display.

2 General specifications

1. Display:

3-1/2 digits, LCD display with

max. reading of 1999 with

decimal point and measurement

unit.

2. Overload

indication:

“OL” indication.

3. Zero Adjust:

External zero adjust knob.

4. Low battery

indication:

Replace battery as LCD display

“ ”

5. Reading speed:

2.5 times per second.

6. Operating

attitude:

Max. 2000 meters above level.

7. Operating

In-door use, under

TM-508A

EN-4

ambience:

environmental pollution grades

two.

8. Operating

temperature

and R.H. value:

5°C to 40°C, 80%RH or lower.

9. Storage

temperature

and R.H. value:

-10°C to 60°C, 70%RH or lower.

10.Power supply:

1.5V × 6 NEDA 15F IEC R6 JIS

SUM-3

11. AC adapter：

AC input Voltage is 100Vac to

240Vac 0.3A with input

frequency of 60 HZ or

50HZ,Free Voltage DC output is

9VDC(8~11VDCMax) Supply

current：＞0.5ADC. Socket：pin

Ground Casing Positive External

Diameter 3.5mm internal

Diameter 2.0mm

12. Dimension

and weight:

160 x 100 x 52mm. approximate

500g.

13. Accessories:

One set of testing clips and

instruction manual.

14. Fuse

specification:

0.5A/250V, 5Øx 20mm. FAST

MIN INTERRUPTS RATINGS

1500A.

TM-508A

EN-5

3 Instrument description

1. RX socket:

For testing clips input.

2. LCD display:

Indication of measured value and

unit.

3. ZERO ADJ.

Knob:

For zero adjustment.

4. Power switch

and Range

selector switch:

Selection in functional range of

the meter.

5. D-H:

Lock up the LCD reading.

6. DC Power

socket:

For AC adapter output DC Voltage

is 9VDC(8~11VDCMax).

FIG (1)

TM-508A

EN-6

4 Notice in prior to the testing

1. Don not connect the testing input terminals LO,

RX, RX, HI,) any input voltage directly, so as to

prevent any possible damage to the internal

circuits of the meter.

5 Electrical specifications:

( 23°C±5°C, 80% RH or lower )

Accuracy : ±( ……….% reading +……… digit):

Range

Accuracy

Resolution

Testing

current

Open Voltage

200mΩ

0.1mΩ

100mA

Approx.

4.8VDC

2Ω

1mΩ

10mA

20Ω

±(0.3%+

4dgt)

10mΩ

10mA

200Ω

0.1Ω

1mA

2kΩ

1Ω

1mA

20kΩ

10Ω

100uA

TM-508A

EN-7

6 Measurement by the Four Wire type one

pair of coated clip

To guarantee an higher precise measurement of

this digital Ohmmeter, an accurate wide range

impedance testing equipment, and to eliminate any

Improper Influence of measurement, especially in

effect of the impedance of testing leads, the

following procedures should be followed.

FIG(2)

1. Please refer to the table shown above, a

testing current is passed in individual testing

range (from HI end to the LO end).

2. The specific electric current flows through

any unknown resistance RX.

3. The Voltage VX can be measured on RX1,

RX2 terminals,

VX = RX x IS therefore RX = VX / IS

4. The unknown resistance value can be given

on LCD display from VX voltage value to be

measured.

5. To obtain accurate impedance measured

without any resistance value impedance

TM-508A

EN-8

between terminals RX1 and RX2.

7 Precise Impedance measurement

1. Insert an RED testing lead into “HI” socket and

another RED testing lead into the adjacent “RX”

socket; insert a BLACK testing lead into “LO”

socket and another BLACK testing lead into the

adjacent “RX” socket,

2. Select the function switch to 200 mΩposition.

3. Short circuit the two testing clips, adjust “ ZERO

ADJUST KNOB” (3-5) to a” 000” reading value on

the LCD.

FIG(3)

TM-508A

EN-9

4. Measure the resistance on PCB by using the

two-point type of measurement per shown in figure 4.

FIG(4)

5. The measured value is shown on LCD .

8 Battery Replacement

The meter is powered by 1.5V battery x6pcs (NEDA

15F IEC R6 JIS UM-3). Use the following procedure to

replace the battery:

1. Replace battery immediately when LCD displays

“ ”.

2. Turn the function switch to the "OFF" position.

3. Use a screwdriver to unfasten the screws on the

battery cover and remove the cover.

4. Take out the old batteries and replace with new

batteries, taking care to note the correct polarity.

TM-508A

EN-10

5. Re-install the battery cover and tighten the holding

screws.

9 Replacement of fuse

For a safety protection of the electrical circuit

please replace new fuse complying the

specification 0.5A/250V, 5Øx 20mm. FAST

MIN INTERRUPT RATINGS 1500A.

1. Select the function range switch to “OFF”

position. To unscrew the bottom case by

using a screwdriver.

2. Pull out the burned fuse and replace a new

one.

3. Close the bottom case and tighten screw.

10 Maintenance and Care

1.That all necessary requirements of inspection and

maintenance are not mentioned in this manual, a

qualified technician should perform it.

2.This meter is a precision digital instrument, whether

in use or in storage, please do not exceed the

specification requirements to avoid any possible

damage or danger during use.

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