RM4104ASEB datasheet(8/16 Pages) SAMES

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PRELIMINARY

RM4104ASEB

USING THE RM4104ASEB METER

RM4104ASEB SETUP

The

RM4104ASEB

meter

equipped

with

several

solderable selectors, which allow the meter to be set up

according to the required specifications. Table 3 describes

the functionality of the various jumpers. When working on

the meter it should be noted that the meter is referenced to

the live voltage and care should be taken to avoid electric

shock.

Name

Option

Description

Closed

Open

These

jumpers

are

used

for

calibration purposes. Refer to the

"Calibrating the Meter" section.

J11

Closed

Open

Closing these jumpers will connect

the on-board power supply to the

SA4104A and leaving them open will

disconnect

the

on-board

power

supply from the SA4104A. This may

be useful for debugging purposes.

J12

J16

VDD

VSS

Used to select the required rated

conditions. Refer to the "Setup of R0,

R1, R2, R3 and FMS for Different

Rated Conditions" section.

Table 3: RM4104ASEB Jumper options

EXTERNAL CONNECTIONS

The meter should be connected as shown in Table 4 and

illustrated in Figure 5. The shunt is connected to J19, the

Live In to J21 and the Neutral to J20. The external “+” and

“-“ terminals on the box are connected to the opto-isolator

output, J22. The stepper motor is connected to J23.

Name

Function Description

LIVE IN: Live current input and Live voltage

input if supplied separately

LIVE OUT: Live current output

No connection (Neutral output if required)

NEUTRAL: Neutral Voltage

+ and -

Opto-isolated pulse output. This should be

connected to the measurement or calibration

equipment if no optical pickup is available.

Table 4: External connection description

CALIBRATING THE METER

The RM4104ASEB is calibrated by means of a resistive

ladder on the voltage sensing network. The eight resistors

can be chosen to represent any desired calibration range.

The calibration accuracy can be extended by adding

resistors to the ladder network. Soldering a jumper in

parallel with a resistor closed will remove that resistor form

the voltage divider network thereby providing a higher input

current to the SA4104A. The RM4104ASEB is calibrated

by first short circuiting resistor R8. If the error is now

positive a larger resistance is required so the jumper

across R8 is opened before proceeding to the next resistor

in the network (R9). If the error is negative then the

process can be continued with the next resistor. These

steps are repeated for all eight resistors in the ladder

network. The SA4104A is linear over the dynamic range

required by the IEC61036 specification, so calibration is

only required at one current value. Typically the basic

current (Ib) is chosen as the calibration point. The

repeatability of error measurements at Ib is typically better

than 0.1%so the error of the meter can be measured

accurately by a single integration of a very small number of

pulses.

LIVE IN

LIVE OUT

NEUTRAL

Isolated Pulse Output

LIVE IN

LIVE OUT

NEUTRAL

Isolated Pulse Output

Figure 5: External connection diagram for the

RM4104ASEB meter

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