Campbell Scientific VDIV10.1, VDIV2.1 User Manual

e

VDIV10.1, VDIV2.1 Voltag

Divider Terminal Input Modules

Revision: 5/07

Copyright © 1996-2007

Campbell Scientific, Inc.

Warranty and Assistance

The VDIV10.1, VDIV2.1 VOLTAGE DIVIDER TERMINAL INPUT
MODULES are warranted by CAMPBELL SCIENTIFIC, INC. to be free

from defects in materials and workmanship under normal use and service for
twelve (12) months from date of shipment unless specified otherwise.
Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation
under this warranty is limited to repairing or replacing (at CAMPBELL
SCIENTIFIC, INC.'s option) defective products. The customer shall assume
all costs of removing, reinstalling, and shipping defective products to
CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will
return such products by surface carrier prepaid. This warranty shall not apply
to any CAMPBELL SCIENTIFIC, INC. products which have been subjected
to modification, misuse, neglect, accidents of nature, or shipping damage. This
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warranties of merchantability or fitness for a particular purpose. CAMPBELL
SCIENTIFIC, INC. is not liable for special, indirect, incidental, or
consequential damages.

Products may not be returned without prior authorization. The following

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cont
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VDIV10.1, VDIV2.1 Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.

1. Function........................................................................1

2. Specifications ..............................................................1

2.1 VDIV10.1.................................................................................................1

2.2 VDIV2.1...................................................................................................2

3. Wiring............................................................................2

4. Programming ...............................................................3

4.1 Example....................................................................................................3

4.1.1 CR1000, CR800, CR850.................................................................4

4.1.2 CR3000, CR5000............................................................................4

4.1.3 CR9000(X)......................................................................................4

4.1.4 CR7.................................................................................................4

4.1.5 CR10(X)..........................................................................................4

4.1.6 CR23X............................................................................................4

4.1.7 21X .................................................................................................5

Figures

Table

1-1. Terminal Input Module ...........................................................................1

2-1. Voltage Divider Module Schematic........................................................2

3-1. Wiring for Differential Voltage Measurement........................................2

3-2. Wiring for Single-Ended Voltage Measurements ...................................3

3-1. VDIV10.1 or VDIV2.1 Connections to Campbell Scientific

Dataloggers ..........................................................................................3

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VDIV10.1, VDIV2.1 Voltage Divider Terminal Input Modules

1. Function

Terminal input modules connect directly to the datalogger's input terminals to
provide completion resistors for resistive bridge measurements, voltage dividers,
and precision current shunts. Voltage dividers are used to divide a voltage to
provide a reduced voltage output that is a fraction of the original voltage. The
VDIV10.1 is a 10:1 voltage divider, the output voltage is one tenth the input
voltage, and allows a voltage up to ±25 volts to be measured on a ±2500 mV
range (CR10(X)) and up to ±50 volts to be measured on a ±5000 mV range
(21X, CR7, CR9000(X), CR23X, CR1000, CR800, CR850, CR3000, CR5000).
The VDIV2.1 is a 2:1 voltage divider, the output voltage is one half the input
voltage, and allows a voltage up to ±5 volts to be measured on a ±2500 mV
range (CR10(X)) and up to ±10 volts to be measured on a ±5000 mV range
(21X, CR7, CR9000(X), CR23X, CR1000, CR800, CR850, CR3000, CR5000).

Each voltage divider module may be used to measure one differential voltage
or two single-ended voltages.

2. Specifications

2.1 VDIV10.1

10:1 Resistive Divider
Resistors

Ratio Tolerance @ 25 °C
Ratio Temperature
coefficient
Power rating 0.25 W
Maximum Input Voltage 50 volts

H

L

G

H

L

AG

H

L

AG

FIGURE 1-1. Terminal Input Module

90 kΩ/10 kΩ
±0.02%

2 ppm/°C

1

VDIV10.1, VDIV2.1 Voltage Divider Terminal Input Modules

H

L

10 k

90 kΩ

H

Ω

90 kΩ

L

2.2 VDIV2.1

3. Wiring

or G

10 kΩ

G

FIGURE 2-1. Voltage Divider Module Schematic

2:1 Resistive Divider
Resistors

Ratio Tolerance @ 25 °C
Ratio Temperature

10 kΩ/10 kΩ
±0.02%

2 ppm/°C
coefficient
Power rating 0.25 W
Maximum Input Voltage 10 volts

Each voltage divider module may be used to measure one differential voltage
(Figure 3-1) or two single-ended voltages (Figure 3-2).

2

Datalogger

H

L

AG or

G or

Shield

H

L

G

SENSOR
H Output

L Output

FIGURE 3-1. Wiring for Differential Voltage Measurement

VDIV10.1, VDIV2.1 Voltage Divider Terminal Input Modules

Datalogger

H

L

AG or

G or

H

L

G

Shields

SENSOR
Signal
Ground

SENSOR
Signal
Ground

FIGURE 3-2. Wiring for Single-Ended Voltage Measurements

TABLE 3-1. VDIV10.1 or VDIV2.1 Connections to

Campbell Scientific Dataloggers

Function

Label/Lead

CR10X,
CR510

CR800, CR850,
CR3000, CR5000,
CR23X, CR1000

21X/CR7

Output High H 1H 1H 1H
Output Low L 1L 1L 1L
Ground G AG

4. Programming

4.1 Example

The output of the voltage divider is measured with the appropriate voltage
measurement instruction. A differential input is measured with the differential
voltage instruction (P2 with the CR23X, CR10(X), 21X, or CR7; VoltDiff with
the CR800, CR850, CR3000, CR5000, CR9000(X), CR1000). A single-ended
input is measured with the single-ended voltage instruction (P1 with the
CR23X, CR10(X), 21X, or CR7; VoltSE with the CR800, CR850, CR3000,
CR5000, CR9000(X), CR1000). Select the smallest input voltage range that
will accommodate the maximum expected output. The smallest possible range
will provide the best resolution.

For example, suppose we want to measure the voltage of a 12 volt battery
system that may actually experience voltages in excess of 14 volts. Using the
VDIV10.1 10:1 voltage divider, the 14 volt output will be divided to 14/10 =

1.4 volts or 1400 mV. Thus the voltage range on which to make the
measurement is the ±2500 mV range on the CR10(X), CR800, CR850, and
CR1000, the ±5000 mV range on the CR23X, 21X, CR3000, CR5000, and
CR9000(X), and the ±1500 mV range on the CR7.

The multiplier to use with the voltage measurement must take into account the
divisor, the calibration of the sensor, and the units desired for the result. In
this example, voltage is divided by 10 and read by the datalogger as millivolts
(i.e., (V/10) x 10

3

= V x 102). To output directly in volts, we use a multiplier

of 0.01.

3

VDIV10.1, VDIV2.1 Voltage Divider Terminal Input Modules

The following examples show the measurement instruction for each of the
different dataloggers to measure the battery voltage described above.

4.1.1 CR1000, CR800, CR850

Public BattVolt
VoltDiff (BattVolt,1,mV2500,1,True ,0,250,0.01,0)

4.1.2 CR3000, CR5000

Public BattVolt
VoltDiff (BattVolt,1,mV5000,1,True ,0,250,0.01,0)

4.1.3 CR9000(X)

VoltDiff(BattVolt, 1, mV5000, 5, 1, 1, 0, 0, 0.01, 0)

4.1.4 CR7

1: Volt (Diff) (P2)
1: 1 Reps
2: 7 ± 1500 mV Slow Range
3: 1 In Card
4: 1 DIFF Channel
5: 1 Loc [ BattVolt ]
6: 0.01 Mult
7: 0 Offset

4.1.5 CR10(X)

1: Volt (Diff) (P2)
1: 1 Reps
2: 25 ± 2500 mV 60 Hz Rejection Range
3: 1 DIFF Channel
4: 1 Loc [ BattVolt ]
5: 0.01 Mult
6: 0 Offset

4.1.6 CR23X

1: Volt (Diff) (P2)
1: 1 Reps
2: 15 5000 mV, Fast Range
3: 1 DIFF Channel
4: 1 Loc [ BattVolt ]
5: 0.01 Multiplier
6: 0 Offset

4

4.1.7 21X

1: Volt (Diff) (P2)
1: 1 Reps
2: 5 ± 5000 mV Slow Range
3: 1 DIFF Channel
4: 1 Loc [ BattVolt ]
5: 0.01 Mult
6: 0 Offset

VDIV10.1, VDIV2.1 Voltage Divider Terminal Input Modules

5

VDIV10.1, VDIV2.1 Voltage Divider Terminal Input Modules

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