U-228

u-228
A recorder is 250mm wide. It is of a desk-top (flat bed) type. It responds to 1 and 2 channels.
The recorder comes standard with a polarity changeover switch, a recording-paper fast-forward switch, a recording-paper rewind knob, a recording-paper-end alarm, and a superimposed event marker that makes it possible to place a mark arbitrarily on a recording line.
A power source can be easily switched among 5 types of voltages: AC100, 115, 200, 220, 240V. It can be used in all parts of the world.
Options are available for use, including a recording-paper wind-up device, a handcart for a recorder, and a separate pen type event marker, etc.
U-228 Specification U-228 Application example U-228 INSTRUCTION MANUAL

Features

  • Shape is easy to write a comment.

    The length of a bed plate for charts is lengthened. This makes it easier to write a comment in longhand from above recorded waveforms.
    Moreover, switches are not arranged on the right sleeve panel so as not to become obstructive when a comment is written in longhand.

  • Built-in simple calibration power supply.

    A power source for calibration with the highest sensitivity to an input range is built in.
    Without separately make available a reference power source for calibration, a check of accuracy can be easily made in the following operating steps.
    (1) Set an input range of the input amplifier unit to the highest sensitivity.
    (2) Set the [MEAS/CHK/CAL] changeover switch to [CHK] and zero point (0%).
    (3) Set the [MEAS/CHK/CAL] changeover switch to [CAL]. If a pen is moved by the built-in power source for calibration and it stops at the position of full-scale (100%). This is normal.

    ※ If a pen is shifted in the direction of + (plus) or – (minus) from the position of 100%, calibration is needed.

  • Recording paper feed operation unit.

    All settings can be made for switching the speed of recording paper (chart paper), and switching the unit of speed, etc.
    A pen can be ascended or descended with a pen lift lever.
    It is possible to operate Channel 1 and Channel 2 respectively.
    With the MARK switch, a mark can be superimposed and placed on a recorded waveform.

  • Input terminal.

    Connections can be made through three types of signal lines: a signal line from which cladding is detached, a signal line to which a Y-crimp terminal is attached, and a signal line to which a banana plug is attached.

U-228 Specs

Model U-228-1P-500 (1channel)
U-228-2P-500 (2channel)
External dimensions 430(W)×123(H)×354(D)mm
(Projection things are not included.)
Mass 1P Approx. 7kg / 2P Approx. 8kg
Use environment
Temperature
  0to 40℃
Humidity
45to 85%RH (No dew condensation)
Power supply AC100, 115, 200, 220, 240V±10% Common for 50Hz and 60Hz
Operation method Automatic balancing system
Effective recording width 250mm
Measuring range 1 / 2 / 5 / 10 / 20 / 50mV
0.1 / 0.2 / 0.5 / 1 / 2 / 5 / 10 / 20 / 50 / 100 / 200V
(17 ranges)
Maximum allowable input voltage 1mV to 50mV range within 30V 100mV to 200 V range within 200V
Input Impedance 1MΩ (constant)
Input method Floating
Resistance Less than 10kΩ
Accuracy ±0.3% (23℃), Temperature Coefficient 0.025%/℃ Max.
Errors Between Ranges 2mV to 50mV Range
  : ±0.15% (23℃), Temperature Coefficient ±0.0050%/℃ Max.
0.1V to 200V Range
  : ±0.20% (23℃), Temperature Coefficient ±0.0075%/℃ Max.
Dead Band ±0.1%
Polarity Switch Provided
Pen Speed Less than 1/3sec
Zero Set Range +100% from right zero center
Chart speed (1)10，15，20，30，40，60 : mm/h, cm/h, mm/min, cm/min
24 steps and 23 speeds
(10mm/min and 60cm/h are overlapping) (2) Chart Drive by External Signal Chart speed
  : 1mm/min at 1Hz, 600Hz Max.
Input impedance
  : 4.7kΩ or more
External signal source Voltage
  : High level +2.0V to +20V
  : Low  level +0.8V to  -20V (Operable at TTL level)
Signal waveforms
  : Pulse, sine wave, square wave, triangular wave, etc.
   (Pulse width 50µsec or more)
Chart End Alarm Following actions take place when chart paper comes to an end
Buzzer is sounded / Chart drive is stopped / Pen is stopped / Lamp is flashed
Pen Lift Individually and manually operated
(Distance between pens : 4mm)
Event Marker Superimposing, Amplitude: +3.5±1 graduation,
Time: 0.2 to 0.4sec (With marker switch)
Calibration power supply Built-in (1V Max.)
Noise Rejection CMRR:DC 160dB or more, AC(50/60Hz) 160dB or more
NMRR:AC(50/60Hz) 64dB or more
Power consumption(TYP.) 1Pen At balanced 19VA / Max. 32VA
2Pen At balanced 21VA / Max. 47VA
Insulation resistance/Withstand voltage Between power supply and chassis (GND)
  : 50MΩ or more (DC500V megger)
Recording paper Roll Recording paper No.2516P50(Length 20m, right zero)
Recording pen 1P NDA-5R(Red)　/　2P NDK-18G(Green)
※Please use genuine products for recording paper. Any failure resulting from any recording paper other than genuine products are out of warranty.

Option

Another pen marker

Besides a recording pen of the main unit, a device makes it possible to place a mark in the right end part of recording paper by using an exclusive-use pen.
It is possible to place an arbitrary mark on a time axis.
Model : U-228-MRK

Recording paper take-up device

A device is used to wind up and store already recorded recording paper automatically.
It is possible to store recording paper neatly without making it slacken.
Model : U-228-TAK

Cart for recorder

Cart for recorder with drawer Model : CAR-1

Application example

Application example of U-228

  • Recording of output waveforms from analyzers.
  • Recording of output waveforms from various testers.
  • Various experiments at universities, research laboratories, and enterprises.
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