Omega PCL422A Manuale utente

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User’s Guide

PCL422A

Rugged, Handheld

Process Calibrators

omega.com info@omega.com

Servicing North America:

U.S.A. Omega Engineering, Inc.

Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)

Engineering Service: 1-800-872-9436 (USA & Canada only)

Tel: (203) 359-1660 Fax: (203) 359-7700

e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves

the right to alter specifications without notice.

omega.com info@omega.com

Servicing North America:

U.S.A. Omega Engineering, Inc.

Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)

Engineering Service: 1-800-872-9436 (USA & Canada only)

Tel: (203) 359-1660 Fax: (203) 359-7700

e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

WARNING

Before attempting to interface the

PCL422A with any other device, carefully read the following instructions.

1. Introduction

The OMEGA Model PCL422A is designed to be a simple, low cost voltage/cur-

package.

The unit is capable of sourcing at ranges of 200mV, 2V, 20V, and 24mA.

Each range is displayed on the LCD readout. Upon power-up, the Model

This unit has the capability to store and recall up to two values in the setpoints

provided by the SP1 and SP2 keys.

The keys and the keys help achieve needed values by selecting

and scrolling digits.

The PCL422A has an RS-232 jack which can be accessed via a custom inter-

face cable available from OMEGA.

1.1 Customer Service

OMEGA Engineering

Tel: (203) 359-1660

Fax: (203) 359-7900

www.omega.com

email: [email protected]

1.2 Unpacking

1. Upon receipt of shipment, inspect the container and equipment for any

signs of damage. Take particular note of any evidence of rough handling

in transit. Immediately report any damage to the shipping agent.

NOTE : The carrier will not honor any claims unless all shipping material is

saved for their examination. After examining and removing contents, save

packing material and carton in the event re-shipment is necessary.

2. Remove the Packing List and verify that all equipment has been received.

If there are any questions about the shipment, please call OMEGA.

Set-up

Become familiar with the designations and polarities of the four output jacks

located on the top of the calibrator. Refer to the back panel label for polarity

information.

2. Operating Procedure

1. After power-up, select the desired output range. The 200mV, 2V, 20V,

and 24mA ranges can be selected by pressing the RANGE key until the

desired range is shown on the LCD readout.

2. Observe the proper polarity when connecting the output jacks. Red is

(+) and Black is (-).

3. Adjust output using the control keys.

When pressed, the keys select a digit on the LCD readout to be

scrolled. When these keys are pressed and held down, a blinking cursor

appears and covers up one of the digits indicating which digit is

selected. After a second more, the cursor starts to move in the direction

selected.

The keys scroll the digit up or down, respectively. As the outputs

are scrolled, the integral LCD readout displays the voltage or current

present at the output jacks.

4. The SP1 or SP2 keys will store or recall a value when pressed.

To store a value in SP1 or SP2, scroll to the desired output. Press and

hold down the SP1 or SP2 keys until the word “STORED” flashes onto

the LCD readout.

To recall a value in SP1 or SP2: momentarily press the SP1 or SP2 keys,

and the value needed from that particular setpoint should appear on the

LCD display.

5. The voltage output jacks are disabled while in the current output mode.

Likewise, the current output jacks are disabled when in the voltage

output mode. Therefore, only one type of output, either voltage or current

can be simulated at one time.

6. The purpose of the RS-232 jack on the PCL422A is to allow data from

the PCL422A to be transferred to a data collection device such as a PC

or a printer. When connecting the PCL422A to a computer, the following

specifications will apply:

a. Baud Rate 2400

b. 8 data bits with 1 stop bit

c. No Parity

Other commands can be sent to the PCL422A from the computer to do all

of the functions such as range change, output adjust, setpoint control, etc.

NOTE: A custom RS-232 cable from OMEGA will be needed. The part

number is C232SJ and can be ordered directly from OMEGA.

When connected to a computer, the PCL422A will begin to send data as

soon as the calibrator is turned on.

3. Operating Considerations and Precautions

1. While operating in the voltage mode, the calibrator’s output circuitry can

sink or source up to 1mA max. Loads greater than 1mA may cause the

calibrator to drop out of its accuracy specification. (See Figure 1)

When there is an excessive load, the word “OVERLOAD” will appear

intermittently on the LCD readout. Long term short circuit conditions will

not harm the calibrator but will cause the battery to decay. Maximum

short circuit is 25 mA.

Figure 1

PCL422A operating as a Precision Voltage Source

2. In the current mode, the maximum load driving capacity of the PCL422A

is 1000 ohms. If connections to the mA jacks are open or the load is

greater than the compliance voltage while trying to source a current, the

word “OPEN LOOP” will appear intermittently on the LCD readout. (See

Figure 2)

Figure 2

PCL422A operating as a Current Source

3. Current loop devices that derive their power supply from an external

power supply can be calibrated as shown in Figure 3.

Figure 3

PCL422A indicating current using an external power supply

−+

−

Volts

Unit

Under

Tes t

Max. Load

1 mA

(+)

(–)

−+

−

Volts

Unit

Under

Tes t

(+)

(–)

O to 24mA

up to

1000 ohms

−+

−

Volts

Unit

Under

Tes t

Power

Supply

(+)

4 to 20mA

30 Volts

Max.

4. This instrument is equipped with an automatic low battery indicator.

When the LCD “BAT” indicator appears, the battery should be replaced

immediately so that the calibrator’s output accuracy is maintained.

4. Accuracy

The PCL422A is checked against an traceable reference before

shipment to verify that each range falls within the .015%, ±2 counts of

accuracy specification. Long term accuracy, beyond one year, should

remain within .030%, ±2 counts of FSR. All of these ratings are based on a

18°C to 28°C ambient temperature.

From 18°C to 0°C and from 28°C to 50°C, there is an accuracy change of

.005% of full scale per °C. Therefore, allowances must be made for error

caused by wide temperature variations.

5. Maintenance

Only qualified service personnel should perform calibration, repairs, or

servicing not covered in this manual. If the calibrator fails, check the batteries

first, and replace them if needed.

Verify that the calibrator is being operated as explained in this manual. If the

calibrator is faulty, call OMEGA's customer service department for an AR

number to return the unit. Be sure to pack the calibrator securely, using the

original shipping container if it is available.

6. Rechargeable Battery Option

When continual service is required, a rechargeable “NI-Cad” 9V battery and

wall mount AC adapter/charger may be purchased. The AC adapter may be

left on continually to keep the charge up on the battery while the instrument

is in use or can be used to recharge a low battery over a 12-14 hour period.

The AC adapter/charger can also be used solely as an AC power supply

without battery installed.

When using the “Ni-Cad” battery, it is advisable to occasionally allow the

instrument to operate until the “BAT” indicator appears then recharge. This

procedure will cycle the battery and prevent any “memory” effects that are

associated with this type of battery.

7. Specifications

Voltage Output mA Output

Output Range: 200mV 2V 20V 24mA

Resolution: 0.01mV 0.1mV 1mV 1mA

Accuracy 18°C to 28°C: ±0.015% of Reading ±2 count

Temperature 0 to 18°C

Stability: 28 to 50°C ±50 ppm/C degrees

Load Capability: ±1mA for rated 1000 ohms

accuracy

Capacitive Load: No limitations N/A

Output Protection: Current limited Internal Resettable fuse

Power: 9V Alkaline battery or optional NiCd

Case Dimensions: 1.43" x 3.15" x 5.7"

Weight: 12 oz.

Specifications subject to change without notice

Indice

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