SCR 120E/200E/250E
Flat-Bed Recorders
User’s Guide
www.cooperinstruments.com
PH: 540-349-4746 • FAX: 540-347-4755
TABLE OF CONTENTS
1. Introduction............................................................................................................................. 1
2. Top View.................................................................................................................................2
3. General Description................................................................................................................ 3
4. Change of Paper......................................................................................................................4
5. Change of Pens........................................................................................................................ 4
5.1 Refill Pens....................................................................................................................... 5
5.2 Cleaning the Pen Carriage Rod....................................................................................... 5
6. Chart Drive Control Panel....................................................................................................... 5
7. Range Selection and Pen Control Panel.................................................................................. 5
8. Rear Panel View......................................................................................................................6
9. Troubleshooting ...................................................................................................................... 6
9.1 Change Fuses .................................................................................................................. 7
9.2 Restringing the Servo Unit..............................................................................................7
10. Technical Data .................................................................................................................... 8
11. Warranty Repair Policy....................................................................................................... 9
CF 129 ii SCR 120E
1. Introduction
Congratulations!
With the purchase of this flatbed recorder you have acquired an instrument that represents the successful
culmination of many years of intensive research and development. We placed special emphasis on
reliable operation and in design and construction of this instrument, user-friendly handling and useroriented possibilities.
A large part of the electronic is mounted on hybrid ceramics carrier material. High reliability and best
protection against interferences from outside result in this concept.
Recorders of the SCR 120E, 200E and 250E work with chart width of 120, 200 and 250 mm. The
recorders use a null balancing potentiometric system for one or for two independent channels. Each
channel is built for voltages from 1 mV -50V.
The pens for both channels are exactly the same and can be easily changed. If not used, they are stored
in adapters to avoid getting dry.
Your recorder is built and tested in accordance with VDE 57411 part 1/VDE 0411 part 1 (protection
arrangement for electronic measuring instruments), EMD and FCC regulations, and it left our company in
a perfect technical shape thus, we call it proven security.
Warning:
To ensure safe operation, please pay attention to all instructio ns and warnings which are included in this
manual. The recorders of the SCR 120E, 200E and 250E are suitable for horizontal use. Please ensure
that the recorder is not placed nearby a source of heat or acid vapors. Make sure that the adjusted line
voltage is the same as the mains voltage before you switch on the recorder.
If not otherwise specified, the recorder is set to:
230V 50 -60 Hz in UK
115V 50 -60 Hz in USA
Be sure that the power cord is plugged in before you connect any input and/or cont rol signals.
Warning:
Each disconnection of internal and external ground wires (green/yellow coded wires) may cause the
instrument to become dangerous. Please ensure that the maximum voltages between the inputs and
ground and the maximum input voltages are not higher than 50 Vpp.
Make sure that only fuses of the specified type and with the specified rated current are used for
exchange. It is not allowed to use repaired fuses or to short the fuse holder. If riskless operation is not
possible anymore, set the recorder out of operation and avoid unintentional use.
Riskless operation is not possible,
• if the recorder has visible damages
• if the recorder does not work anymore
• after longer storing under cad conditions
• showing heavy transport damage
CF 129 1 SCR 120E
2. Top View
1 Place to park pens, avoids drying out
2 Chart drive control panel
3 Range selection and pen control
4 Paper guides
5 Manual paper transport knob
6 Rear panel view
7 Mains power cord
CF 129 2 SCR 120E
3. General Description
Be sure that the power cord is plugged in before you connect any input and/or control signals.
The Power LED on the chart drive control panel must be on.
CF 129 3 SCR 120E
4. Change of Paper
• Switch the recorder off
• Unblock the paper guides and clap them to a vertical position
• Remove the empty roll in direction to the rear side
• Insert the new paper roll into the rear side of the recorder. Please ensure that the paper is
running out to the upper side as shown in the figure below
• Fold the paper that it ends in a point and move it through the recorder as shown in the figure
below
• Use the manual paper transport knob to move the paper forward
• Correct the paper position to have it parallel to the roller chain sprocket. Please ensure that the
holes in the paper fit exactly to the sprockets. This is important for accurate and trouble-free
paper transport.
• Clap the paper guides down and press them at the edges until they snap in
• Switch the recorder on
5. Change of Pens
• Switch the recorder off
• Move the pen holder to the paper center
• Take the pen at the rear end and lift it until it snaps out, then take it out of the holder
• Move the new pen over the carriage. Please ensure that it is exactly over the holder
• Press the pen down at the rear end until it snaps in
• Switch the recorder on
To prevent the pens from drying out when the recorder is not in use, put them in the slant adaptor on the
upper side of the front. Syringes and ink bottles are available to refill the pens.
CF 129 4 SCR 120E
5.1 Refill Pens
• Switch the recorder off
• Remove the pen from the pen holder
• Hold the pen with the tip to the upper side and remove the tip
• Fill a maximum of 1 ml ink of the pen color with a syringe into the tip hold
• Insert the tip in the tip hole and clean the pen
• Mount the pen on the pen holder
• Switch the recorder on
5.2 Cleaning the Pen Carriage Rod
Cleaning the pen carriage rod should be done periodically because dust particles harden and increase
the friction and use up the guiding plastics of the pen holders. To clean; use methyl alcohol only. Never
use oil or grease!
6. Chart Drive Control Panel
Press button (3) to activate the chart drive. The LED (7) is on when the chart drive is on. Use button (2)
to choose the chart speed range either in mm/min or in mm/s. Use button (8) to choose chart speeds
from 0.1 up to 2.0.
With buttons (4) and (5) the electrical penlift for channel one and two can be activated. The penlift is
independent from the chart drive function.
7. Range Selection and Pen Control Panel
1. Rotary switch to select the input range
Scale 1: mV 1 2 5 10 20 50 100 200
Scale 2: V 0.5 1 2 5 10 20 50
Maximum input voltage 50 V
2. Zero setting adjustment
Use the zero setting potentiometer to position the zero setting anywhere on the chart. Release the M/Obutton=input signal off=input signal disconnected to have the zero setting.
CF 129 5 SCR 120E
3. VAR-potentiometer
If the range is selected to 100 mV and the variable range expansion is set to 250% and the Zero setting is
adjusted to the left paper wide and the input voltage is 40 mV, then the pen moves to the right side of the
chart: 40 mV x 2.5=100 mV = full range
4. VAR/CAL-button
Release the button to work with calibrated input ranges. The VAR-potentiometer position is ignored.
Press the button to work with variable input ranges. The VAR-potentiometer position defines the
preamplification of the input signal up to 250% of the selected range
5. mV-V-button
Release the button to record mV-signals at the standard terminals at the rear. Press the button to record
V-signals
6. M/O-button
Release the button to disconnect the input signal and to disable the counter voltage. Press the button to
record input signals
8. Rear Panel View
To comply with electrical safety standards, the signal voltage and the voltage from signal input to earth
should never exceed 50 V.
The interfaces are at the rear side of the recorder.
Black terminal Low Connected to common ground of the channel and to protective
ground via a capacitor
Red terminal High mV/V input
9. Troubleshooting
The list below is made to help users to locate malfunctions and to repair them.
Error What is wrong How to repair
No recorder
function
Chart drive 1 Chart drive on/off button not
CF 129 6 SCR 120E
1 Power supply failure
2 Instrument is switched off
3 Power cord defect
4 Fuse blown
pressed
2 Chart drive control set to external
3 External clock frequency failure
4 Incorrect chart speed
5 Paper jam
Supply correct voltage
Set the power switch to on position
Replace it with a new one
Replace it with the correct new one
Check the line voltage selector
Press the chart drive on/off button
Set chart drive control internal
Vpp too low
Supply correct clock frequency
Check speed button and chart speed
switch positions
Insert paper correctly
Service system
Pen does not go
down
Zero setting Button M/O pressed Input signal to high
Pen moves not
regular
Pen vibrates Mains hum at the input Change Lo/Hi inputs and avoid mains
9.1 Change Fuses
• Turn the recorder off and disconnect it from the wall outlet
• Turn the fuse holder cap counter-clockwise to remove it and the fuse
• Insert a new fuse into the fuse cap
• Fit the fuse cap into the fuse holder and turn the fuse holder cap clockwise
• Connect the recorder to the wall outlet and switch it on. Do not use fuses of a different type or
with a different nominal currency! Do not use repaired fuses or shorten the fuse holder! If new
fuses blow again or if the recorder does not work properly, please inform Cooper Instruments by
calling 800-344-3921.
9.2 Restringing the Servo Unit
We recommend you contact Cooper Instruments to have a broken string repaired. If you want to repair it
yourself, please follow the description below:
• Order a new string: Length: L120 with 863 mm, L200 with 1023 mm and L250 with 1123 mm.
The strings are with loop and ring at the ends.
• Switch the recorder off and disconnect it from the wall outlet
• Remove the old string or parts of it
• Hang the string in the string wheel as shown below
1 Chart drive is off
2 Pen up/down button not pressed
3 Pen(s) inserted incorrectly
4 Lifting magnet blocked
Input open or incorrect signal supply Check input signal supply
Switch chart drive on
Press the pen up/down button
Insert the pen(s) correctly
The electronic is out of order, call
Cooper customer service
Set M/O button to 0 position
hum at the input
• Insert the string in the upper slot and wrap it ¾ rounds for channel 1 or 2 ¾ rounds for channel 2
clockwise around the string wheel
• Insert the string in the lower slot and wrap it 2 ¾ rounds for channel 1 or ¾ rounds for channel 2
counter-clockwise around the string wheel
• Fix the string at the string wheel with a pressure sensitive tape
• Pull the string wheel on the servopotentiometer axis; do not fasten it with the screw
• Wrap the long end of the string (without spring) 1 ½ rounds around the driving wheel and connect
it with other end to the pull spring
• Fasten the string at the clamp block on the sledge
CF 129 7 SCR 120E
• Move the pen sledge to the middle of the chart and insert a pen in the pen holder
• Remove the string wheel from the servopotentiometer axis and turn the servo potentiometer to its
middle position. Use an Ohmmeter to measure 2.5 Kohm
• Pull the string wheel on the servopotentiometer axis and fasten it with a screwdriver
• Connect the recorder to the wall outlet and switch it on. Check for correct function.
10. Technical Data
Number of channels 1- an d 2- channel versions
Chart Width L120E-120 mm
L200E-200 mm
L250E-250 mm
Input ranges 1 2 5 10 20 50 100 200 mV
0.5 1 2 5 10 2 50 V
Zero setting Chart width plus 200% suppression
Accuracy ±0.5% or ±20 µV
Linearity ±0.35%
Reproducibility ±0.35%
Full scale deflection time L120E˜0.12s
L200E˜0.18s
L250E˜0.2s
Pen speed ˜0.8 m/s
Input impedance DC mV-ranges >30 Mohm
DC V-ranges 2 Mohm
DC mA >1 Ohm
Source impedance <5 kOhm
Temperature drift mV-ranges ˜0.1 µV/·C
V-ranges ˜10 µV/·C
Long time drift ˜1 µV/Monat
Overload protec tion
The maximum input voltage is not allowed to exceed 50Vpp.
Range expansion Continuously adjustable up to 250% of the
Cut-off frequency ˜3.6 Hz Sine wave/ -3 db
CMRR >130 db
50/60 Hz -damping 45/52 db
Pen lift Separate controlled for each channel
Chart Drive
Chart speeds 0.1 0.2 0.5 1 2 5 10 20
Resolution 0.08 mm
Functions Fast forward and reverse
Environmental conditions
Temperature range +10°C to 40°C
Humidity range <80% relative humidity
< ±50 Vpp
selected range
mm/s or mm/min
CF 129 8 SCR 120E
Safety Protection class I, built according to VDE 0411
FCC rating VDE 0871 Class B
Power supply
AC voltage 115/230 V with external selector
Fuses Primary 115 VAC 400 mA slow blow
230 VAC 200 mA slow blow
Secondary 4x630 mA slow blow
1x1.25 mA slow blow
Power consumption <20 VA
Noise suppression Line filter
Dimensions (WxDxH) L120E 261x350x127 mm
L200E 340x350x127 mm
L250E 390x350x127 mm
Weight 3 kg
11. Warranty Repair Policy
LIMITED WARRANTY ON PRODUCTS
Any of our products which, normal operating conditions, proves defective in material or in workmanship
within one year from the date of shipment by COOPER, will be repaired or replaced free of charge
provided that you obtain a return material authorization from COOPER and send the defective product,
transportation charges prepaid with notice of the defect, and establish that the product has been properly
installed, maintained, and operated within the limits of rated and normal usage. Replacement or required
product will be shipped F.O.B. our plant. The terms of this warranty do not extend to any product or part
thereof which, under normal usage, has an inherently shorter useful life than one year. The replacement
warranty detailed here is the buyer’s exclusive remedy, and will satisfy all obligations of COOPER
whether based on contract, negligence, or otherwise. COOPER is not responsible for any incidental or
consequential loss or damage which might result from a failure of any and all other warranties, express or
implied, including implied warranty of merchantability or fitness for particular purpose. Any unauthorized
disassembly or attempt to repair voids this warranty.
OBTAINING SERVICE UNDER WARRANTY
Advance authorization is required prior to the return to COOPER. Before returning the item, contact the
Repair Department c/o Cooper Instruments at (540) 349-4746 for a Return Material Authorization
number. Shipment to COOPER shall be at buyer’s expense and repaired or replacement items will be
shipped F.O.B. our plant in Warrenton, Virginia. Non -verified problems or defects may be subject to a
$100 evaluation charge. Please return the original calibration data with the unit.
REPAIR WARRANTY
All repairs of COOPER products are warranted for a period of 90 days from date of shipment. This
warranty applies only to those items that were found defective and repaired, it does not apply to products
in which no defect was found and returne d as is or merely recalibrated. Out of warranty products may be
capable of being returned to the exact original specifications or dimensions.
* Technical description of the defect: In order to properly repair a product, it is absolutely necessary for
COOPER to receive information specifying the reason the product is being returned. Specific test data,
written observations on the failure and the specific corrective action you require are needed.
CF 129 9 SCR 120E
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