TMA

ES-5211 Rev.7

Specifications subject to change without notice.

INSTALLATION

Power input

AC:

operational voltage range: rating ±10%,

50/60 ±2 Hz, approx. 2VA

DC:

operational voltage range: rating ±10%

(ripple 10% p-p max.)

approx. 80mA at 24V

approx. 160mA at 12V

Operating temperature: -5 to +60°C (23 to 140°F)

Operating humidity: 30 to 90% RH (non-condensing)

Mounting: surface or DIN rail

Dimensions: W50×H80×D123 mm (1.97"×3.15"×4.84")

Weight:

400 g (0.88 lbs)

P. 2 / 4

Accuracy: ±0.1%

Temp. coefficient: ±0.015%/°C (±0.008%/°F)

Response time: ≤0.5 seconds (0 – 90%)

Line voltage effect: ±0.1% over voltage range

Insulation resistance: ≥100MΩ with 500V DC

Dielectric strength: 1000V AC @1 minute

(input to output to power)

2000V AC @1 minute (input to ground)

2000V AC @1 minute (output to ground)

EXPLANATIONS

■The TMA Telemetering Module provides 1 to 5mA DC current signal. The current signal has a high impedance

of 5MΩ and thus the signal level is not affected by leadwire resistance of cable connected to the receiving

instrument, the receiving resistor receives a current signal proportional to the input signal 1 to 5V DC.

The current varies only by 0.02% (=1kΩ / 5MΩ) when the leadwire resistance value changes from 0Ω to 1kΩ.

3

4

1

2

3

4

1

2

TMA-S

TMA-R

TRANSMITTING

POINT

RECEIVING

POINT

E

INPUT

OUTPUT

1kΩ

r

r

1 – 5mA DC

1 – 5mA DC

■AVAILABLE NTT LINE

Among the several circuit lines opened by NTT (Nip-

pon Telephone & Telegraph), the TMA utilizes the

“special DC line” of 50 b/s.

The following shows the conditions to use this line.

■LEADWIRE RESISTANCE

Most popular wire size among the cables for city

telecommunication lines is that of 0.65 mm diameter.

This wire has about 100Ω of leadwire resistance for 1

kilometer with return, thus 3kΩ is for about 30

kilometers.

0.65

0.90

Cable size

1.25

2.00

Approx. Resistance

(Ω/km; including return)

100

55

35

20

ITEM

DATA

Transmission speed

50 b/s max.

Technical configuration

2-wire (metalic return)

4-wire (metalic return

Communication

Uni-directional, full-duplex

Intersection

Not allowed

Circuit protection

Required

Electrical characteristics

Current 45mA max.

Voltage between lines 100V max.

Voltage to ground 50V max.