OMEGA 156 Instruction Manual

OMEGA

Model 156

Strip Chart Recorder

User ’s Manual

0115-0196 • 11/4/99

Introduction..........................................................................................................................................................3

Unpacking ..........................................................................................................................................................4

Specifications......................................................................................................................................................5

General ........................................................................................................................................................5

Servo System ..............................................................................................................................................5

Chart Drive System ......................................................................................................................................5

Setup Procedures................................................................................................................................................8

Electrical Connections..................................................................................................................................8

Setting Voltage ......................................................................................................................................8

Power Cord ............................................................................................................................................8

Chart Paper Installation................................................................................................................................9

Pen Installation ............................................................................................................................................9

Grounding ..................................................................................................................................................10

Input Signal Connections............................................................................................................................10

Recording Procedure..................................................................................................................................11

General Theory ................................................................................................................................................12

Power Supply..............................................................................................................................................12

Pen Drive System ......................................................................................................................................12

Chart Drive System ....................................................................................................................................12

Calibration Procedures......................................................................................................................................14

Power Supply..............................................................................................................................................14

Pen Drive System ......................................................................................................................................14

Chart Drive System ....................................................................................................................................14

Gain......................................................................................................................................................14

Offset....................................................................................................................................................15

Span ....................................................................................................................................................16

Special Features ..............................................................................................................................................18

Remote Chart Control ................................................................................................................................18

Remote Chart Programming/TTL ..............................................................................................................18

Operational Tips and Maintenance ..................................................................................................................20

Troubleshooting ................................................................................................................................................21

Analog Section............................................................................................................................................21

Chart Drive Section ....................................................................................................................................22

Accessories ......................................................................................................................................................23

2

Table of Contents

The dc analog recorder is an application of advanced
electronic techniques. Its solid state modular circuitry
yields high performance and reliability.

This graphic recorder may be used in many different
applications in the medical, teaching and industrial fields
where a precision instrument is of utmost importance.

Measurement of dc voltage, current, temperature and a
variety of other variables are made possible with the use
of these recorders.

3

Introduction

Remove the packing list and verify that you have received
all equipment. If you have any questions about the ship­ment, please call the OMEGA Customer Service
Department.

When you receive the shipment, inspect the container
and equipment for any signs of damage. Note 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 reshipment is necessary.

If the recorder fails to operate properly, check all connec­tions, cables and fuses. Ensure that all plug-in boards are
firmly seated in place. Double-check for “pilot error”
before calling the factory.

DO NOT RETURN RECORDERS FOR FACTORY
WARRANTY SERVICE WITHOUT SPECIFIC
AUTHORIZATION.

4

Unpacking

General

Power: 120/240 VAC + 10%, 50/60 Hz
Wattage: 15 Watts
Fuse: 3AG Slo-Blo 0.3A @ 120V

3AG Slo-Blo 0.15A @ 240V or
Two 5 x 20 Slo-Blo 0.16A@ 240V

Writing Method: Pens are disposable fiber tipped units

with self-contained ink supply.
Chart: 125 mm width; 30 meter length
Dimensions: 5.0” H x 10.8” W x 11.5” D
Weight: 8.0 lb.

Servo System

Span-Full Scale: 1mV, 2mV, 5mV, 10mV, 20mV,

50mV, 100mV, 500mV, 1V, 2V and 5V

(10mV through 50V with uncalibrated

10:1 attenuator)
Input Type: Floating (±100V single ended)
Input Impedance: 2.5 Megohms, 1mV to 5V ranges
Pen Response: Less than 50 cm/sec
Damping: Critically damped on all ranges

(requires no adjustment)
Accuracy: Linearity: ±5%

Deadband: ±0.1%

Repeatability: ±0.1%
Zero Adjust: Continuously adjustable from -100%

to +100% (full scale +100%

suppression) Right hand zero is

standard
Normal Mode: 35 db Typical @ 3Hz, 100 Volts

Maximum
Rejection: Begins filtering @ 3Hz, 100 Volts

maximum

Chart Drive System

Chart Drive: Stepper Motor
Chart Speeds: 1,2,3,4,5,6,10,12,15,20 and 30 cm per

minute and per hour, switch selectable
Chart Speed
Accuracy: Less than 0.03% error - typical 0.02%
Control: Internal: crystal oscillator

External: remote pulse train,TTL/CMOS

or contact closure for start/stop

5

Specifications

6

Figure 1: Single Channel Output/Control Location

7

Figure 2: Power Entry Module Voltage Selector

The procedures detailed in the following paragraphs must
be performed to prepare the recorder for operation.

Electrical Connections

Setting Voltage

Check the voltage selector block located next to the
power cord connector on the rear panel. The white plastic
tab indicates the voltage for which the instrument has
been configured. This has been factory set for the voltage
appropriate to your country (120 or 240 VAC; 50 or 60
Hz). If the voltage is incorrectly set, you should reset it to
the proper value before proceeding further. The recorder
will not function in 100 and 220 VAC positions.

1. Insert the blade of a small screwdriver in the slot
next to to the connector and pry open the fuse
block. Pull the fuse block straight out.

2. Using tweezers or a pair of long nose pliers, pull
the voltage selector card straight out.

3. Orient the plastic indicator for the proper voltage
as indicated in Figure 2, then press the selector
card back in place.

4. Ensure that the proper fuse is inserted for the
voltage selected as follows:

0.3A Slo-Blo for 120 VAC and

0.15A Slo-Blo for 240 VAC, 3AG or

0.16A Slo-Blo for 240 VAC, 5 x 20 mm

5. Snap the fuse block cover back in place.

Power Cord

Power to the recorder is provided by a standard modular
power cord assembly. Connect the power cord to the
receptacle next to the fuse block.

8

Setup Procedures