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3

VOLTMETER RANGE CHANGE CONNECTIONS

APOLLO VOLTMETER INPUTS & CONFIGURATIONS

10

9

8

7

6

5

4

3

2

1

1M

75K

CW

25-turn built-in scaling pot, provides a continuously variable division rate of ÷1 through ÷13. When connected

in conjunction with the multi-tap voltage divider, direct readout from virtually any proportional transducer.

900K

90K

9K

1K

IN

V

÷10

÷100

÷1000

COMM.

0-1.999V

BASIC INPUT

115 VAC

50/60 HZ

POWER IN

Range Selection Jumper

Voltages over 1.999V are connected to

a multi-tap precision divider (Terminal 3

and 7) whose output is then jumpered

back to the basic 0-1.999V input. See

"Voltage Range Connections" below.

(+)

(-)

OPERATING POWER - Maximum power line variation ±10% 

(Terminals

3 and 8)

Basic Apollo

Voltmeter

Input Range

0-1.999V

(+)

(-)

BASIC

VOLT-

METER

CIRCUIT

FRONT PANEL

FINE SCALE

ADJUSTMENT

PRECISION

MULTI-TAP

RANGE CHANGE

VOLTAGE DIVIDER

SCALING ADJ. POT FOR

NON-VOLTAGE READOUT

DECIMAL

POINT

SWITCHES

DISPLAY

The simplified schematic (left) shows all of 

the features that permit the Apollo Voltmeter 

to cover in-plant voltage related measurements. 

The basic voltmeter range is 0 to 1.999 V. For 

higher voltage readout, a multi-tap precision 

voltage divider can be connected to extend the 

range up to 300 V. A built-in scale adj. pot. 

extends the capability of Apollo Voltmeters 

even further to provide direct readout from 

transducers that generate signal voltage 

outputs proportional to RPM, PSI, FPM, etc. 

Note: When used to readout in scaled units 

other than voltage, the front panel adjustment 

can be used as a fine trim scaling adjustment.

SCALING FOR DIRECT READOUT OF OTHER 

VARIABLES

In many industrial applications, a voltage sensing instrument is required to 

display a reading in terms of PSI, RPM, or some other variable. The signal 

voltage being measured is normally generated by a transducer which senses the 

variable and delivers a linearly proportional output voltage.

The multi-tap divider and the scale adj. pot. of the Apollo Voltmeters can be 

connected in tandem 

(series)

 to scale 

(divide)

 virtually any signal voltage up to 

300 V max. down to the basic 0 to 1.999 V input range to get the desired reading. 

The multi-tap voltage divider provides coarse ranges of division and the scaling 

pot. provides continuous selection of division factors between the taps.

Note: The normal decade division factors (÷10, ÷100, and ÷1000) have been 

adjusted in this schematic to account for parallel connection of the scale pot. 

resistance which increases these factors as shown.

In order to determine the jumper wiring configuration of the Apollo for a 

scaled application, we must first determine the division factor required to 

provide the desired display.

USING THE FORMULA:

VT  x  D.D.P.  =  D.F.

D.R.

10

9

8

7

6

5

4

3

75

K

900K

90K

9K

1K

12

105

1005

BASIC

VOLT-

METER

CIRCUIT

TRANS-

DUCER

MAX

VT

1M

V

SCALING

POT

1

13

WHERE:

 

VT  =  Maximum Transducer Output

 

D.D.P  =  Display Decimal Point

 

D.R.  =  Desired Reading

 

D.F.  =  Division Factor

  

D.D.P.

 

0.000 

=  1 

The Display Decimal Point

 

00.00 

=  10 

(D.D.P.) is determined by

 

000.0 

=  100 

the desired decimal point

 

0000 

=  1000  placement in the readout.

Then we connect the divider and pot. to obtain the adjustable division range 

we need to bracket the proper division factor 

(See “Scaling Connection 

Diagrams” below)

.

EXAMPLE 1:

 A pressure transducer delivers a 5.5 V signal @ 120.0 PSI 

maximum.

VT  x  D.D.P.  =  5.5  x  100  =  4.58 D.F.

D.R.                120.0

This division factor falls between 1 and 12, so connect per 

“Diagram A”

 

below. Calibrate by adjusting the scaling pot. to get the proper readout at a 

known pressure.

SCALING CONNECTION DIAGRAMS

10

9

8

7

6

5

COMM.

1 ≤ D.F ≤ 12

Diagram C

Diagram A

Diagram B

Diagram D

12 ≤ D.F ≤ 105

105 ≤ D.F ≤ 1,005

1,005 ≤ D.F ≤ 13,000

VT

(+)

(-)

4

3

COMM.

3

6

4

5

7

8

(-)

T

V

9

10

(+)

(-)

COMM.

3

6

4

5

7

8

VT

(+)

9

10

10

3

6

4

5

7

8

9

(-)

COMM.

VT

(+)

EXAMPLE 2:

 A tachometer generator delivers 210 VDC at maximum 

machine speed which is to be indicated as 575 FPM on an Apollo Voltmeter.

210 V (Max. from tach. gen.)  x  1000 (D.P.P.)  =  365 (D.F.)

575 (Desired Readout)

This division factor falls between 105 and 1005, so connect per 

“Diagram 

C”

 above. Calibrate by adjusting the scaling pot. to get the proper readout at a 

known speed.

8

7

6

5

4

3

(+)

(-)

COMM.

0-1.999V

COMM.

3

(-)

4

5

8

(+)

6

7

0-19.99V

(3 & 8) 0-1.999V INPU

RANG

E

(3 & 7) 0-19.99V INPU

RANG

E

(3 & 7) 0-199.9V INPU

RANG

E

3

COMM.

4

5

(-)

8

6

7

(+)

0-199.9V

JUMPER

JUMPER

(3 & 7) 0-300V INPUT

 RANG

E

COMM.

3

4

5

(-)

8

JUMPER

6

7

(+)

0-300V

Содержание APLI

Страница 1: ...not specified by the manufacturer the protection provided by the equipment may be impaired SPECIFICATIONS 1 DISPLAY 3 1 2 digit 0 56 14 2 mm high 7 segment LED minus sign displayed when current or voltage is negative Decimal points inserted before 1st 2nd or 3rd least significant digits by DIP switch selection 2 POWER 115 VAC 10 50 60 Hz 6 VA Isolation 2300 Vrms for 1 min between input and supply ...

Страница 2: ...al radio transmitter Also Signal or Control cables within an enclosure should be routed as far away as possible from contactors control relays transformers and other noisy components 4 Long cable runs are more susceptible to EMI pickup than short cable runs 5 In extremely high EMI environments the use of external EMI suppression devices such as Ferrite Suppression Cores for signal and control cabl...

Страница 3: ...o the basic 0 to 1 999 V input range to get the desired reading The multi tap voltage divider provides coarse ranges of division and the scaling pot provides continuous selection of division factors between the taps Note The normal decade division factors 10 100 and 1000 have been adjusted in this schematic to account for parallel connection of the scale pot resistance which increases these factor...

Страница 4: ...sensitivity 199 9 mA since the 1 3 amp actual current exceeds the maximum current rating of this range See Specifications for maximum current 11 10 9 8 7 6 5 3 CW 900Ω 90Ω 9Ω 9Ω 0 1 999MA 0 19 99MA 0 1 999A 0 199 9MV BASIC INPUT BASIC VOLT METER CIRCUIT SCALE ADJ 4 COMM 1Ω 0 199 9µA TYPICAL RANGE SELECTION 0 120 0MA MAX DISPLAYED AS 0 100 SEE THE EXAMPLE AT RIGHT I 0 199 9MA INSTALLATION ENVIRONME...

Страница 5: ...r He replaces the access plug to keep dust out of the Apollo The Apollo voltmeter now indicates the oven temperature and the baker can monitor his temperature precisely 1 2 3 4 5 6 7 8 9 10 115 VAC 50 60HZ COMM 1000 100 10 V 1 999V IN SCALE ADJUST OVEN HIGH COMM SHIELD 375 THERMOMETER DIGITAL TEMPERATURE MONITORING IN A BISCUIT BAKING OPERATION TYPICAL VOLTAGE CURRENT MEASUREMENT APPLICATIONS VOLU...

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