Spectrum SC-100 Manuale utente

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SPECTRUM Instruments Ltd. P:1-800-778-3428 F:1-866-782-0106 E: info@spectrum-instruments.com

Sensor Checker

SC-100

Rev. 1.0

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SPECTRUM Instruments Ltd. P:1-800-778-3428 F:1-866-782-0106 E: info@spectrum-instruments.com

Caution

Please read this manual carefully before

operating the SC-100 Sensor Checker

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Contents

1. Product Description................................................................................................................................................... 4

2. SC-100 Map and legend............................................................................................................................................ 5

3. Using SC-100 Sensor Checker.................................................................................................................................. 6

3.1 Sensor simulation mode.......................................................................................................................................... 7

3.2 Sensor checker mode .............................................................................................................................................. 8

4. Maintenance............................................................................................................................................................ 10

5. Device Dimensions................................................................................................................................................. 11

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SPECTRUM Instruments Ltd. P:1-800-778-3428 F:1-866-782-0106 E: info@spectrum-instruments.com

1. Product Description

SC-100 is a battery operated, easy to use instrument which is used to check sensor condition by measuring

bias voltage and to electronically simulate IEPE sensor output from accelerometers.

Power is supplied from one internally mounted 9V alkaline battery. There is also a LED indication of LOW

battery.

Operational mode can be selected by side switch mounted on left side. There is also a visual indicator of

selected mode placed on the front panel. In the middle position device is OFF.

In BOV TEST mode, the user can read measured bias voltage on the screen, and sensor status indicated on

the LED diodes on the front panel. There are three predefines sensor status’ which are related to the bias

voltage and they are: SHORT CIRCUIT, SENSOR OK and OPEN CIRCUIT.

In SIGNAL GENERATOR mode, the instrument produces a fixed frequency sinusoidal signal to simulate

accelerometer or velocity sensor output.

Specification

Outputs

Type BOV - Bias Output Voltage

IEPE (ICP®) - current sinking

Signal Generation

Amplitude 100mV RMS, sinusoidal

Amplitude accuracy ±1.0%

Frequency 160Hz

Frequency accuracy ±1.0%

THD <1%

Environmental characteristics

Temeprature

Operating -10°C to +65°C

Storage -18°C to +65°C

Humidity 95% R.H. maximum

Power

Battery 1 x 9V Alkaline 9V (6LR61) battery

Physical characteristics

Dimension 150mm x 80mm x 30mm

Weight 0.5kg typical

Case Molded plastic case

Connection BOV, IEPE – BNC

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2. SC-100 Map and legend

Figure 1. Legend of SC-100

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3. Using SC-100 Sensor Checker

Selection of available functions is done by a side-switch mounted on the left side of the device. The front

panel includes six indicating LED diodes. Two LED diodes placed on left side of front panel indicate

operating mode of the device. The upper diode indicates SIGNAL GENERATION mode and the lower

indicates BOV TEST mode. When the device is off, both diodes are off. Three LED diodes placed on the

upper right position indicate status during BOV TEST. The possible indications are SHORT CIRCUIT,

SENSOR OK and OPEN CIRCUIT. The bottom right LED diode is battery empty indicator and battery

should be replaced when this diode lights up.

There is also a LCD screen which displays measured bias voltage in volts, when the device operate in BOV

TEST mode.

Figure 2. Empty battery notification

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3.1 Sensor simulation mode

Figure 3. SIGNAL GENERATION mode

SIGNAL GENERATOR mode is triggered by

placing side-switch in upper position. In this

operational mode, the Sensor Checker produce a

sinusoidal output voltage signal of 100mV RMS

at 160 Hz. In this case, the LCD screen is off, and

only the LED diode which indicates opearating

mode on front panel is lit. These values are fixed,

and not changeable. Values are choosen based on

standard of industrial accelerometer with

100mV/g, to produce 1g RMS readout on measure

instrument. Detailed table with converted values

for testing different types od vibration sensor is

provided below.

160Hz

units

RMS

PEAK

100

141.4

m/s2

9.81

13.87

1.41

mm/s

9.75

13.79

ips

0.38

0.54

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3.2 BOV TEST mode

BOV TEST mode is triggered by placing side-switch in lower position. In this operational mode, sensor

checker can be used to test functionality of IEPE sensors. This is done by measuring bias voltage of

connected sensor. In this case, the BNC connector on top is used as an input for sensor. This checker is

suitable for checking bias voltage for all sensors that support IEPE standard. There is also a notification

about measeured voltage on LCD display on front panel and visual status of sensor with three LED diodes

placed on the front panel. Possible states are SHORT CIRCUIT, SENSOR OK and OPEN CIRCUIT.

Figure 4. Short circuit situation

If a measured voltage is below 7V, a SHORT

CIRCUIT LED diode (red LED) is lit up. BOV

readings below 7V usually indicate sensor

damage. Common sources of sensors damage are

exposure to excessive temperature, excessive

shock, electrostatic discharge or damaged

amplifier. If a measured voltage is near 0V it can

indicate a short connection between cable wires.

Figure 5. Good bias voltage situation

If a measured voltage is below 15V and greater

than 7V a SENSOR OK LED diode (green LED)

is lighted up and it usually means that sensor is in

good condition. It is recommended to check

documentacion for nominal bias voltage for

sensor under test.

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Figure 6. High bias voltage situation

If a measured voltage is greater than 15V an

OPEN CIRCUIT LED diode (yellow LED) is lit

up and it usually means the sensor amplifier is

disconnected or reverse powered. In most cases,

the problem is in the connector or sensor cabling.

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SPECTRUM Instruments Ltd. P:1-800-778-3428 F:1-866-782-0106 E: info@spectrum-instruments.com

4. Maintenance

If an Empty battery LED light up, battery should be replaced. Battery can be changed by opening a battery

compartment on backside of the device.

Figure 7. Battery replacement

For this operation you need a flat screwdriver.

First, you must put screwdriver in a backdoor

opening hole. After that, gently pull the

screwdriver to the front of the Sensor Checker.

Door should be opened. Take out a battery and

replace it with a new one. Place a battery in such

way that there is not tension on the battery cable.

Place a backdoor and gently push till it close.

Sensor Checker is now ready to be used again.

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