EZ OS-5100RA User manual

Oscilloscope
Analog Readout Oscilloscope
Operation Manual

Oscilloscope
Analog Readout Oscilloscope
Operation Manual

DECLARATION OF CONFORMITY
according to ISO/IEC Guide 22 and EN 45014
Manufacturer’sName: EZDigitalCo.,Ltd.
Manufacturer’s Address: 222-28, Nae-dong, Ojeong-gu, Bucheon-si,
Gyeonggi-do R. O. K, 421-160
Declares that the product:
Product Name: OSCILLOSCOPE
Model Numbers: OS-5100RA
OS-5100RB
Date: Feb. . 1997.
Conforms to the following product specifications:
Safety: EN 61010-1 : 1993 + A2:1995
(IEC 10101 : 1990 + A1:1992
+A2:1995, modified)
CertifiedbyTUVRheinland
EMC: EN 55011 : 1991
EN 61000-3-2 :1995
EN 61000-3-3 :1995
EN 50082-1 :1992
CertifiedbyVDE
Supplementary Information:
The product herewith complies with the requirements of the Low Voltage Directive
73/23/EEC and the EMC Directive 89/336/EEC.
Bucheon, Gyeonggi
CheolYoung Kim
Location QualityAssurance Manager

WARRANTY
Warranty service covers a period of one year from the date of original purchase.
In case of technical failure within a year, repair service will be provided by our service
center or sales outlet free of charge.
We charge customers for repairs after the one year warranty period has been expired.
Provided that against any failure resulted from the user’s negligence, natural disaster or
accident, we charge you for repairs regardless of the warranty period.
For more professional repair service, be sure to contact our service center or sales
outlet.

Introduction
Thank you for purchasing a EZ product. Electronic measuring instruments produced by
EZ Digital are high technology products made under strict quality control. We guarantee
their exceptional precision and utmost reliability. For proper use of the product, please
read this operation manual carefully.
NOTE
1. To fully maintain the precision and reliability of the product use it within the range
of standard setting (temperature 10℃～35℃, humidity 45%～85%).
2. After turning of power, please allow a pre-heating period of as long as some 15
minutes before use.
3. This equipment should be used with a triple line power cord for safety.
4. For quality improvement the exterior design and specifications of the product can
be changed without prior notice.
5. If you have further questions concerning use, please contact the EZ Digital service
center or sales outlet.

Safety Summary
Safety Precautions
Please take a moment to review these safety precautions. They are provided for your
protection and to prevent damage to the oscilloscope. This safety information applies to
all operator and service personnel.
Caution and warning statements.
CAUTION : Is used to indicate correct operating or maintenance proceduresinorder
to prevent damage to destruction of the equipment or other property.
WARNING : Calls attention to a potential danger that requires correct procedures or
practices in order to prevent personal injury.
Caution (refer to accompanying documents) and Warning.
Protective ground (earth) symbol.

SPEC MODEL OS-5100SRS
* Environmental Charac.
1) Temperature range for
rated operation
+10℃to +35℃(+50℉to +95℉)
2) Max. ambient operating
temperature
0℃to +40℃(+32℉to +104℉)
-20℃to +70℃(-4℉to + 158℉)
3)
Max. storage temperature
4) Humidity range for
rated operation 45% to 85% RH
5) Max. ambient operating
humidity
35% to 85% RH
* READOUT
1) Cursor Readout ΔV, ΔT, 1/ΔT
2) Frequency Counter Marking for Auto setup from 100Hz to 50MHz
3) Resoultion 1/100 DIV
* Probe Adjust
1) probe Adjustment About 1KHz 0.5Vp-p(±2%) square wave.
Duty rate : 50%

1-3. PRECAUTION
Before you operate this instrument, follow the following procedure to ensure safe
operation and to prevent any damage to the instrument.
1-3-1. Line Voltage Selection
1. Voltage Range : 90 ~ 250VAC
2. Frequency Range : 48 ~ 440 Hz
3. Fuse : 250V / 1.6A(Time Lag)
Caution This product has the ground chassis(3 wire power cord is used).
Check whether any other equipment connecting with this product requires
the transformer before use.
Do not directly connect it to the AC power nor to the circuit directly
connected to the AC power.
Otherwise serious personal injury or damage to this product for a long time
without trouble.
1-3-2. Installation and Handling Precautions
when placing the OS-5100RA(RB) in service at your workplace, observe the following
precautions for best instrument performance and longest service life.
1. Avoid placing this instrument in an extremely hot or cold place. Specifically,
don? leave this instrument in a close car, exposed to sunlight in midsummer,
or next to a space heater.
2. Do not use this instrument immediately after bringing it in from the cold. Allow
time for it to warm to room temperature. Similarly, don? move it from a warm
place to a very cold place, as condensation might impair its operation.
3. Do not expose the instrument to wet or dusty environments.
4. Do not place liquid-filled containers (such as coffee cups) on top of this
instrument. A spill could serious damage the instrument.
5. Do not use this instrument where it is subject to servere vibration, or strong
blows.

6. Do not place heavy objects on the case, or block the ventilation holes.
7. Do not use this oscilloscope in strong magnetic fields, such as near motors.
8. Do not insert wires, tools, etc. through the ventilation holes.
9. Do not leave a hot soldering iron near the instrument.
10. Pre-heating in necessary after moving.
11. Do not place this oscilloscope face down on the ground, or damage to
the knobs may result.
12. Do not use this instrument upright while BNC cables are attached to the
rear-panel connectors. This will damage the cable.
13. Do not apply voltages in excess of the maximum ratings to the input
connectors or probes.
14. This oscilloscope is to use UL listed double insulated probes only.

1-4. ACCESSORY
The following accessaries are included in the packing of this product :
1. Operating manual : 1 copy
2. AC power cord : 1 EA
3. Probe : 2 EA (option)
4. Fuse : 2 EA
1-5. SYMBOL
Caution : refer to accompanying documents.
Danger : High Voltage.
Protective ground (earth) terminal.
1-6. SAFETY
This instrument has been designed and tested in accordance with IEC Publication
1010-1 (overvoltage category Ⅱ, pollution degree 2), Safety requirements for
electrical equipment for measurement, control, and laboratory use. The CENELEC
regulations EN 61010-1 correspond to this standard. This instruction manual
contains important information and warning which have to be followed by the user
to ensure safe operation and to retain the oscilloscope in a safe condition.
The case, chassis and all measuring terminals are connected to the protective
earth contact of the appliance inlet. The instrument operates according to
Safety Class I (three-conductor power cord with protective earthing conductor
and a plug with earthing contact).
The mains/line plug shall only be inserted in a socket outlet provided with a
protective earth contact. The protective action must not be negated by the use of
an extension cord without a protective conductor.
The mains/line plug should be inserted before connections are made to measuring
circuits.
The grounded accessible metal parts (case, sockets, jacks) and the mains/line
supply contacts (line/live, neutral) of the instrument have been tested against
insulation breakdown with 1500Vrms.

1-7. EMC
This instrument conforms to the European standards regarding the electromagnetic
compatibility. The applied standards are : Generic immunity standard EN50082-1,
(for residential, commercial and light industry environment) Emission standard
EN55011 (for ISM Equipment), EN61000-3-2, EN61000-3-3.

2. OPERATING INSTRUCTIONS
2-1. FRONT PANEL FUNCTION
OS-5100RA
OS-5100RB

1.INTENSITY : Clockwiserotationincreasessweepbrightness.
2. TEXT INTENSITY : Clockwise rotation increases character brightness.
3. FOCUS : To obtain maximum trace sharpness.
4. SCALE ILLUMINATION : To adjust graticule illumination for photographing
the CRT display.
5. TRACE ROTATION : Allows screwdriver adjustment of trace
alignment with regard to the horizontal graticule
lines of the CRT.
6. POWER SWITCH : Push in to turn instrument power on and off.
7. CH1 X IN CONNECTOR : For applying an input signal to vertical amplifier
channel 1, or to the X-axis(horizontal) amplifier
during X-Y operation.
8. CH2 Y IN CONNECTOR : For applying an input signal to vertical amplifier
channel 2, or to the Y-axis(vertical) amplifier during
X-Y operation.
9. CH 3 CONNECTOR : For applying an input signal to vertical amplifier
Channel 3.(only for 5100RA)
10. CH 4 CONNECTOR : For applying an input signal to vertical amplifier
channel 4. (only for 5100RA) For applying external
trigger signal to the trigger circuits.
11. PROBE ADJUST : Outputs square wave (0.5V, 1kHz) to calibrate probe
and vertical amplifier.
12. GROUND CONNECTOR : Provides an attachment point for a separate ground
lead.
13. VERTICAL BLOCK
a. POSITION : The key which moves the Y axis position of the
waveform from CH1~4.
b. VOLTS/DIV : Changes from 2mV to 5V with 1-2-5 step. When
push key, operate as UNCAL.
c. AC/DC/GND : Waveform is operated toggling AC/DC/GND.
d.0.1V/0.5V : Changestotwo states of 0.5, 0.1V and applies only
for CH3, 4 (only for 5100RA).
e. AC/DC : Changes waveform to AC/DC and applies only for
CH3, 4(only for 5100RA).
f. CH2 INV : Changes the polarity of CH2 waveform.
g. CH3/CH4 : Selects CH3, 4 on QUAD (only for 5100RA).

14. HORIZONTAL BLOCK
a. POSITION : Moves the X-axis position of sweep.
b. TIME/DIV : Changes the time of sweep from 50ns to 5s with 1-
2-5 step.
c. X 10 MAG : Amplifies the X side of sweep 10 times.
d. A/B : Selects A time, B time.
15. MODE KEY & SELECT KEY
a. VERTICAL MODE : CH1, CH2, CH3, DUAL, ADD, QUAD.
(only for 5100RA)
b. HORIZONTAL DISPLAY : A, B, ALT, X-Y.
c. TRIGGER MODE : AUTO, NORM, TV-V, TV-H, SNGL.
d. TRIGGER SOURCE : CH1, CH2, VERT, CH3, CH4, LINE.(only for
5100RA)
e. TRIGGER COUPLING : AC, DC, HF-R, LF-R.
f. SELECT : Marks the selection of each position with ▶ when
mode keys are displayed.
16. MISCELLANEOUS FEATURES
a. TEXT ON/OFF : Toggles the character on CRT as Mode Menu sign,
Mode Menu clear sign and the whole screen clear by
key input.
b. AUTO SET : This key input lets the sweeped waveform of any
position marked as suitable size and position.
c. CURSOR : Moves cursor when it is displayed.
(1) ΔV/ΔT : Toggles three cursors of Y-axis, X-axis and off.
(2) SELECT : This is cursor selection key which moves cursor
with ▽ sign when cursor is displayed.
d. TRIG LEVEL : This key adjusts waveform to be stable when it is
sweeped. To select the trigger signal amplitude at
which triggering occurs. When rotated clockwise,
the trigger point moves toward the positive peak of
the trigger signal.
When this control is rotated counterclockwise, the
trigger point moves toward the negative peak of the
trigger signal.

e. HOLD OFF : This key is adjusted for the stable synchronism of
waveform. This is used at the position 0% usually.
Allows triggering on certain complex signals by
changing the holdoff time of the main A sweep.
The avoids triggering
on intermediate trigger points within the repetition
cycle of the desired display. The holdoff time
increases with clockwise rotation.
f. TRACE SEPARATION : Changes Y-axis position of B sweep on ALT
selection of Hori display.
g. DLY? POSITION : Changes X-axis position of B sweep on ALT
selection of Hori display.
h. SLOPE : Determines the starting point of the selection of
rising edge and dropping edge of waveform.
i. B TRIG? : On ALT selection of Hori Display, this is selected
for synchronizing of B time.
j. SGL READY : When Trigger Mode is on SNGL, this is selected for
display of waveform each one time.
k. ALT/CHOP : This can be selected when two or more waveform is
displayed.
I. BW LIMIT : This terminal diminishes 20MHz or more noise for
diminishing high frequency noise.

2-2. REAR PANEL FUNCTION
REAR
1. ACINLET :Connectionandremovalcanbeeasywith the using
of AC power cord.
2. FUSE
3. CH1OUTPUT :Amplifiessomepartofsignalwhichwasinput
to CH1, and provides it for frequency counter
or the other equipments.
4. EXT BLANKING INPUT: This terminal input signals for the brightness
modulation of CRT. Brightness decreases
with + signal input and it increases with- signal
input.

2-3. INSTALLATION AND BASIC OPERATION
2-3-1. Character Display
1. Description of each position
a. When cursor is displayed, ∆TA(TB), ∆V1 (V2, V3) are marked here.
b. When cursor is displayed, ∆1/TA, and Auto Setup frequency are marked here.
c. ‘MG’is marked here on X 10 MAG.
d. ‘>’is marked here on UNCAL of A Time DIV (pressed state).
e. A Time DIV is marked here.
f. HOLD OFF, TRIG LEVEL are marked here.
g. VERT MODE, HORI DISPLAY, TRIGGER SOURCE, TRIGGER MODE,
TRIGGER COUPLING MENU are marked here.
h. Selection sign of select key is marked here.
i. Contents of CH1 is marked here when VERT MODE is QUAD.
J. Contents of CH2 is marked here when VERT MODE is QUAD.
k. ‘BW’is marked here on operation of BW LIMIT KEY.
I. ‘CHOP’is marked here on operation of ALT/CHOP KEY.
m. Contents of CH1 is marked here when VERT MODE is CH1, DUAL, ADD.
Contents of CH3 is marked here when VERT MODE is CH3, QUAD.
n. ‘+’sign is marked here on VERT MODE is ADD.
o. ‘↓’ sign is marked here with the operation of CH2 INVERT when VERT
MODE is CH2, DUAL, ADD, QUAD.
p. Contents of CH2 is marked here when VERT MODE is CH2, DUAL, ADD.
q. ‘B-T’ is marked here on B TRIG?D KEY operation after ALT selecting of
HORI Display.
r. ‘>’is marked here on UNCAL when HORI display is B or ALT.
s. B Time DIV of HORI display is marked here.
t. ‘’, ‘’sign is toggled here on SLOPE KEY operation.

2-3-2. Initial Display
1. Setting at the power on
a. VERT MODE : CH1
b.HORIDISPLAY : A
c. TRIGGER MODE : AUTO
d. TRIGGER SOURCE : CH1
e.TRIGGERCOUPLING : AC
f. TIME / DIV : 1ms
g.VOLTS/DIV : 5V
h. CURSOR : ∆V1
i. AC/DC/ GND : AC
j. HOLD OFF : 0%
k. SOUND : ON
l. TEXT ON / OFF : ON

2-3-3. Probe Adjustment
When applying the external signal to measure using oscilloscope, use probe. The
applied waveform is displayed on the CRT of oscilloscope. The product has two points :
×1 (direct connection) and ×10 (attenuation). At ×10 point, the input impedance of
oscilloscope increases, which attenuates the input signal by 1/10. Therefore, it is
necessary to multiply 10 to the measurement unit (VOLTS/DIV)
The damping probe is used for high frequency measurement because of the reduction of
input capacity which distorts signal and reduces the load. Using any incorrectly
calibrated probe may cause error in the measurement. So adjust the probe as follows :
1. Connect probe to CH1 X IN, With CH1 Trigger Coupling set to DC, connect tip to
PROBE ADJUST. In this case, set the probe damping position to ×10 and set
VOLTS/DIV to 10mV.
2. Adjust TRIGGER LEVEL to stabilize screen. When the top or a part of spherical
wave is slanted or has any tooth, adjust the probe adjustment trimmer as shown in
Fig. PROBE COMPENSATION using small screw driver.
PROBE
PROBE COMPENSATION

2-3-4. Vertical Mode
1. Menu Selection
a. CH1 : When the first of select key is pressed, ▶ sign is displayed beside
CH1 of screen and the content is displayed at the position of 3.
onlythesignalwhichinputtoCH1isdisplayedonCRT.
b. CH2 : When the 2th of select key is pressed, ▶ sign is displayed beside
CH2 of screen and the content is displayed at the position of 4.
onlythesignalwhichinputtoCH2isdisplayedonCRT.
c. CH3 : When the 3th of select key is pressed, ▶ sign is displayed beside
CH3 of screen and the content is displayed at the position of 3.
onlythesignalwhichinputtoCH3isdisplayedonCRT (only for
5100RA)
d. DUAL : When the 4th of select key is pressed, ▶ sign is displayed beside
DUAL of screen and the content is displayed at the position of 3.
onlythesignalwhichinputtoCH1andCH2isdisplayed on CRT.
e. ADD : When the 5th of select key is pressed, ▶ sign is displayed beside
ADDofscreenandthesamecontentsofd.??signisdisplayed
between3,4.