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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.
Features
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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) |
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External dimensions |
430(W)×123(H)×354(D)mm (Projection things are not included.) |
Mass | 1P Approx. 7kg / 2P Approx. 8kg |
Use environment |
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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) |
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
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
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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