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Products
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DUAL TRACE OSCILLOSOCPE |
KM - 20 - 10 - 20MHz Oscilloscope
KM – 20 – 20 – 20MHz Oscilloscope
With Frequency Counter
Description
These 20MHz Oscilloscope are dual- channel oscilloscope with maximum
sensitivity of 1 mV/DIV. The time base provides a maximum sweep time of
0.2 µ S/DIV. When magnified by 10, the sweep speed is 20nS/DIV. These
oscilloscope employ a 6-inch rectangular type TOSHIBA cathode-ray tube
with red internal graticule. These oscilloscopes are sturdy, easy to
operate and exhibit high operational reliability.
Special Features :
• High luminance, internal
graticule Toshiba CRT
• Japanese electronic encoder, light handy and reliable
• Fully sealed long live vertical mode switch
• ALT Triggering Function. Two independent signals simultaneous
observation.
• Triggering Level Lock Function, Automatic Synchronize Function.
• Built-in 6 Digit Frequency Counter. (*available in model KM – 20-20)
• High intensity CRT with high acceleration voltage : The CRT is a high
beam transmission, high intensity type
with a high acceleration voltage of 2KV. It displays clear readable
traces even at high sweep speeds.
• The Oscilloscope has a trigger level lock function which makes the
triggering adjustment unnecessary.
• Alternate triggering : Even an observation of two waveforms of different
frequencies, the waveform of the each channel
is stably triggered.
• TV sync triggering : The oscilloscope has a sync separator circuit for
triggering of TV-V and TV-H signals.
• CHI Output : Terminated 50 output of channel 1 signal available on rear
panel for driving frequency counter or
other instruments.
• Z-Axis Input : Intensity modulation capability permits time or frequency
markers to be added. Trace blank with
positive signal, TTL compatible.
• X-Y operation : Set the switch to X-Y. Then the instrument works as an
X-Y oscilloscope. CH1 can be applied as
horizontal deflection (X-axis) while CH2 provide vertical deflection
(Y-axis).
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Input Power : AC/110/220V ±10%
Power Consumption : Approx. 40 VA
Weight : Approx. 8kg.
Frequency : 50/60 Hz
Dimension : 310(W) x 150(H) x455(D)mm |
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VERTICAL AXIS
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Sensitivity |
5mV ~ 20V/DIV
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Vernier vertical Sensitivity
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To 1/2.5 or less of panel – indicated value
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Sensitivity Accuracy
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< 3% (x5 MAG : < 5%)
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Frequency bandwidth
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DC ~ 20MHz (x5 MAG:DC ~ 7MHz)
AC coupling: Low limit frequency 10Hz. (with reference to 100KHz,
8DIV. Frequency response with- 3dB)
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Rise time |
Approx. 17.5nS (x5MAG:Approx. 50nS)
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Input impedance |
Approx. 1M
// Approx. 25pF
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Square wave characteristics
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Overshoot: < 5% (At 10mV/DIV range)
Other distortions and other ranges :
5% added to the above value.
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DC balance shift |
Adjustable on panel.
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Linearity |
< ±0.1 DIV of amplitude change when waveform of 2 DIV at graticule
center is moved vertically.
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Vertical Mode |
CH1 : CH1 single channel.
CH2 : CH2 single channel.
DUAL : CH1 and CH2 are Displayed. ALT or CHOP
selectable at any sweep rate.
ADD : CH1 + CH2 algebric addition.
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Chopping repetition frequency
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Approx. 250 KHz
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Input coupling |
AC , GND , DC
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Maximum input voltage
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300V peak (AC : frequency 1 KHz or lower)
When set probe switch at 1:1, the maximum effective readout is
40Vpp (14Vrms at sine wave ), or set probe switch at 10:1 , the
maximum effective readout is 400Vpp(140Vrms at sine wave).
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Common mode rejection ratio
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50:1 or better at 50KHz sinusoidal wave. (When sensitivities of
CH1 and CH2 are set equally)
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Isolation between channels (At 5mV/DIV range)
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>1000:1 at 50KHz
>30:1 at 20KHz
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CH1 signal output |
At least 20mV/DIV into a 50 ohm termination. Bandwidth is 50Hz to
at least 5MHz.
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CH2 INV BAL. |
Balanced point variation : < 1 DIV (Reference at
center graticule.) |
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TRIGGERING
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Triggering source
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CH1, CH2, LINE, EXT(CH1 and CH2 can be selected only when the
vertical mode is DUAL or ADD.) In ALT mode, if the TRIG. ALT
switch is pushed in, it can be used for alternate triggering of
two different source.
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Coupling
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AC : 20 Hz to full bandwidth
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Slope
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+ / -
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Sensitivity
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20 Hz ~ 2 MHz : 0.5 DIV, TRIG - ALT : 2 DIV, EXT : 200 mV 2 ~ 20
MHz : 1.5 DIV TRIG - ALT : 3 DIV, EXT : 800 mV TV : Sync pulse
more than 1 div ( EXT : 1V )
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Triggering modes
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AUTO: Sweeps run in the free mode when no triggering input signal
is applied. (Applicable for repetitive signals of frequency 25Hz
or over.)
NORM: When no triggering signal is applied, the trace is in the
ready state and not displayed.
TV-V : This setting is used when observing the entire vertical
picture of television signal
TV-H : This setting is used when observing the entire horizontal
picture of television signal. (Both TV-V and TV-H synchronize only
when the synchronizing signal is negative)
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EXT triggering signal input Input impedance Max. input voltage
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Approx. : 1M ohm // approx.25pF 300V (DC + AC peak), AC: Frequency
not higher than 1KHz
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HORIZONTAL AXIS
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Sweep time |
0.2 µ Sec ~ 0.5 Sec / DIV, 20 steps in 1-2-5
sequence |
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Sweep time accuracy
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+/-3% |
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Vernier sweep time control
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< 1/2.5 of panel-indicated value
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Sweep magnification
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10 times |
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x10MAG sweep time accuracy
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+/-5% (20nSec~50nSec are un calibrated)
+/-3%, x10MAG: +/-5% (20ns and 50ns are un calibrated) |
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Position shilft caused by x 10MAG
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Within 2 DIV. At CRT screen center
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X – Y MODE |
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Sensitivity |
Same as vertical axis. (X-axis: CH1 input signal; Y-axis:CH2 input
signal) |
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Frequency bandwidth |
DC to at least 500KHz |
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X-Y phase difference |
3Deg at DC ~ 50KHz
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Z – AXIS |
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Sensitivity |
20Vp-p (Positive-going signal decreases intensity)
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Frequency bandwidth |
DC ~ 2 MHz |
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Input resistance |
Approx. 47K
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Max. input voltage |
< 30V (DC+AC peak, AC frequency 1KHz)
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CALIBRATION VOLTAGE
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Waveform |
Positive-going square wave
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Frequency |
Approx. 1 KHz |
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Duty ratio |
Within 48:52 |
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Output voltage |
2Vp-p +/-2% |
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Output impedance |
Approx. 1 K ohm |
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CRT
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Type |
6-inch rectangular type, internal graticule
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Phosphor |
P31 |
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Acceleration voltage
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Approx. 2KV |
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Effective screen size
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8 x 10 DIV (1 DIV=10mm(0.39in)
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Graticule |
Internal |
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Trace rotation |
Provided |
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