DMM/2-Channel Oscilloscope with 30-MS/s Sampling
Berthesis
LEADER ELECTRONICS CORP.
Table of Contents
| 1. | INTRODUCTION 1-1 |
|---|---|
| 1.1 | General Description 1-1 |
| 1.2 | Features 1-2 |
| 1.2.1 | DMM Section 1-2 |
| 1.2.2 | Oscilloscope Section 1-2 |
| 1.2.3 | Other Features 1-3 |
| 1.3 | Specifications 1-4 |
| 1.3.1 | Display 1-4 |
| 1.3.2 | DMM Section 1-4 |
| 1.3.3 | Oscilloscope Section 1-6 |
| 1.3.4 | Logic Scope Section 1-8 |
| 1.3.5 | Printer Output Section (LOGIC SCOPE Input Section) 1-9 |
| 1.3.6 | Memory Card (Separately Sold Option) 1-9 |
| 1.3.7 | General Specifications 1-9 |
| 2. | OPERATING PRECAUTIONS 2-1 |
| 2.1 | Avoiding Excessive Inputs 2-1 |
| 2.2 | Battery Operation 2-2 |
| 2.3 | External DC Power 2-3 |
| 2.4 | High Temperature and Humidity 2-3 |
| 2.5 | Avoid Excessive Shock 2-3 |
| 2.6 | LCD Contrast |
| 2.7 | BANK Memory Backup 2-3 |
| 3. | PANEL DESCRIPTIONS |
| 3.1 | Power Group |
| 3.2 | Display Group 3-2 |
| 3.3 | DMM/Scope Function Group 3-3 |
| 3.4 | DMM Group |
| 3.5 | VERTICAL Group |
| 3.6 | TRIGGER Group |
| 3.7 | SWEEP Group |
| 3.8 | FUNCTION Group |
| 3.9 | Other Group |
Providence and the second
| 4. | USING THE DMM 4-1 |
|---|---|
| 4.1 | Panel Controls Used 4-1 |
| 4.2 | Range Switching 4-1 |
| 4.3 | Low-Power Resistance Measurement (LPΩ) 4-2 |
| 4.4 | Diode Test and Continuity 4-2 |
| 4.5 | Data Logger Function 4-3 |
| 4.6 | Printout of the Display Screen 4-6 |
| 5. | USING THE OSCILLOSCOPE |
| 5.1 | Panel Controls Used |
| 5.2 | Probe Calibration 5-2 |
| 5.3 | Display Screen |
| 5.4 | AUTO RANGE and AUTO SETUP 5-4 |
| 5.5 | Establishing Triggering to Freeze Waveforms on the Display Screen 5-6 |
| 5.6 | Sweep Time and Display Mode 5-8 |
| 5.7 | Observation of One-Time Signals 5-10 |
| 5.8 | Memory Configuration and Size 5-10 |
| 5.9 | LONG Memory Mode |
| 5.10 | Waveform Storage and Recall 5-12 |
| 5.11 | Waveform Comparison |
| 5.12 |
Automatic Input Signal Peak-to-Peak Voltage
and Frequency Measurement |
| 5.13 | Display Screen Printout 5-17 |
| 6. | USING THE LOGIC SCOPE |
| 6.1 | Panel Controls Used |
| 6.2 | Logic Probe (Separately Sold Option) |
| 6.3 | Display Screen |
| 6.4 | Memory Size and Sampling Frequencies |
| 6.5 | Waveform Storage and Recall |
| 6.6 | Waveform Comparison |
| 6.7 | Display Screen Printout |
| 7. | CALENDAR AND TIME SETTINGS |
| 8. | AUTO POWER-OFF SETTING AND CANCELING |
Rogida'i Edenni - Mic
anime and a second second
| 9. | MEMORY CARD | 9-1 |
|---|---|---|
| 9.1 | Using the Memory Card | 9-1 |
| 9.2 | Battery Replacement and Data Protection | 9-3 |
presentation states of the second
1. INTRODUCTION
1.1 General Description
The Model 300 is a portable DMM/oscilloscope featuring a digital storage oscilloscope with 30-MS/s sampling and digital multimeter functions in a single, highly portable package.
It has a full compliment of the latest features, such as a logic scope function for easy logic timing observation, memory-card memory expansion, and even an AUTO SETUP function that displays the input waveform optimally on the display screen automatically.
1.2 Features
1.2.1 DMM Section
- In addition to the six basic measurement functions (DC/AC voltage, DC/AC current, resistance, and low-power resistance), the Model 300 features a continuity beeper function to test for circuit shorts.
- Full autoranging is provided, making range selection simply a matter of applying the probes to the measurement points. Manual range selection is also possible.
- DMM measurement values can be displayed simultaneously with waveforms, and the electrical isolation between the DMM and scope sections enables simultaneous waveform observation and DMM measurements on completely different circuit parts.
- A data logger function is provided which enables printout of measured values at a given time interval. The provision for a built-in clock and the ability to determine the measurement of time is convenient in unmanned periodic production-line voltage monitoring.
1.2.2 Oscilloscope Section
- High-speed sampling (30 MS/s for one channel and 15 MS/s for two channels), and 10-MHz bandwidth for adequate coverage of the video band.
- 128 points (7 bits) of vertical-axis resolution and 180 words of horizontalaxis resolution
- The memory size can be selected as 180 words or 1800 words for observation of long waveforms.
- A high-capacity bank memory is provided, enabling storage of up to ten displayed waveforms for each channel. This is battery backed up so that contents are not lost when power is switched off.
- In addition to the bank memory, each channel can store up to 40 waveforms using a memory card, enabling easy memory expansion.
- An automatic setup function provides instant optimization of the input waveform display, by automatically optimizing the vertical-axis and horizontal-axis ranges and trigger levels.
- The currently input waveform and a waveform from bank memory can be simultaneously displayed. This enables easy waveform comparison, so that by storing a standard waveform in bank memory, a go/nogo comparison can be made on an input waveform.
- A printout of a displayed waveform can be made on a dedicated printer, a useful feature in generating reports and other documentation.
- The technique of storing an input waveform in memory and playing the waveform back (digital storage operation) is convenient in observing onetime events.
- A pretriggering function can be used to observe parts of a waveform before the trigger occurs, a feature not possible with normal oscilloscopes.
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- The horizontal-axis range can be selected as slow as 20 s/div, a convenient feature in observing extremely slow-changing signals.
- An X-Y display can be obtained with CH1 serving as the X axis and CH2 serving as the Y axis, enabling Lissajous pattern observation of two signals.
1.2.3 Other Features
- A large, high-contrast LCD screen is used, providing a wide viewing angle and a sharp display even outdoors.
- A logic scope function is provided as a convenience in timing observations of logic signals.
- Battery operation is possible using just four type AA (R6) batteries, and the Model 300 is small enough and light enough to be highly portable, enabling it to be carried and used anywhere.
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1.3 Specifications
| 1.3.1 | Display | |||
|---|---|---|---|---|
| Туре | STN dot-matrix liquid-crystal display | |||
|
Dot configuration
Waveform display area Settings display area |
V: 128 dots × H: 240 dots
V: 128 dots × H: 180 dots V: 128 dots × H: 60 dots |
|||
| Dot size | V: 0.43 mm × H: 0.43 mm | |||
| Effective display area | V: 60 mm × H: 113 mm | |||
| Scales |
V: 8 div × H: 12 div (1 div = 15 dots)
(Scales displayed with half-tone contrast.) |
|||
| Contrast adjustment | Located on the side panel. | |||
| 1.3.2 | DMM Section | |||
| Measurement functions |
DC voltage, AC voltage, DC current, AC cur-
rent, resistance, low-power resistance*, con- tinuity check, diode test * Used for in-circuit resistance measure- ment; open-circuit resistance- measurement voltage is lower than a diode's Vth. |
|||
| Maximum display | 3199 (dot-matrix LCD) | |||
| Range selection | Autoranging and manual selection | |||
|
Autoranging operation:
Up-range at 2800 to 3199 Down-ranging at 269 or lower |
||||
| Polarity switching | Automatic; both + and - are displayed. | |||
| Input terminals | Three: V, Ω/mA, and COM | |||
| Sampling rate | 2.5 times/s | |||
DC voltage measurement (DCV)
| Range | Resolution | Measurement Accuracy |
Input
Impedance |
|---|---|---|---|
| 320.0 mV | 100 µV | ±(0.35% of rdg + 3 dgts) | 100 MΩ min. |
| 3.200 V | l mV | ±( " ) | Approx. 11 MO |
| 32.00 V | 10 mV | ±( " ) | Approx. 10 MΩ |
| 320.0 V | 100 mV | ±(0.5% of rdg + 3 dgts) | - |
| 1000 V | 1 V | ±(0.6% of rdg + 3 dgts) |
AC voltage measurement (ACV) (40 Hz to 500 Hz)
| Range | Resolution | Measurement Accuracy |
Input
Impedance |
|---|---|---|---|
| 3.200 V | 1 mV | ±(1.0% of rdg + 5 dgts) | Approx. 11 MΩ |
| 32.00 V | 10 mV | ±( * ) | Approx. 10 MΩ |
| 320.0 V | 100 mV | ±( " ) | н |
| 750 V | 1 V | ±(1.2% of rdg + 5 dgts) | - |
Resistance measurement (Ω)
| Range | Resolution | Measurement Accuracy |
Open-Circuit
Voltage |
|---|---|---|---|
| 320.0 Ω | 100 mΩ | ±(0.4% of rdg + 3 dgts) | Approx. 1.5 V |
| 3.200 kΩ | 1Ω | ±( * ) | 0.65 V ±0.2 V |
| 32.00 kΩ | 10 Ω | ±( " ) | |
| 320.0 kΩ | 100 Ω | ±( " ) | |
| 3200 kΩ | 1 kΩ | ±(1.0% of rdg + 3 dgts) | • |
| 32.00 MΩ | 10 kΩ | ±(2.0% of rdg + 3 dgts) | я |
Low-power resistance (LPΩ)
| Range | Resolution | Measurement Accuracy |
Open-Circuit
Voltage |
|---|---|---|---|
| 3.200 kΩ | 1Ω | ±(0.5% of rdg + 3 dgts) | 0.45 V max. |
| 32.00 kΩ | 10 Ω | ±(") | |
| 320.0 kΩ | 100 Ω | ±(") | - |
| 3200 kΩ | 1 kΩ | ±(1.0% of rdg + 4 dgts) | - |
| 32.00 MΩ | 10 kΩ | ±(2.0% of rdg + 4 dgts) | - |
Current measurement (DCA, ACA) (ACA: 40 Hz to 500 Hz)
| Function | Range | Resolution | Measurement Accuracy |
|---|---|---|---|
| DCA | 320.0 mA | 0.1 mA | ±(1.0% of rdg + 3 dgts) |
| ACA | 320.0 mA | 0.1 mA | ±(1.5% of rdg + 3 dgts) |
Resistance between input terminals: Approx.1 Q (not including fuse resistance)
Continuity check/Diode test ( */····)
1.3.3
| Threshold level | Approx. 1 kΩ max. |
| Open-circuit voltage | Approx. 1.5 V |
| Response time | Approx. 100 ms |
| Display | The continuity mark is displayed on the LCD and a beeper sounds. |
| Other uses | Diode go/nogo checking |
| Print function |
Displayed data can be hardcopied on a dedi-
cated printer. |
| Data logger function | |
| Interval time | 5 s to 10 min., settable in 1-5-10-30 steps (6 ranges) |
| Number of data | 10 to 200, and ∞ , settable in 1-2-5 steps (6 ranges) |
| (10 to 200 when outputting to a memory card.) | |
| Output method |
Dedicated printer or memory card (output is
possible from the memory card to the print- er) |
| Oscilloscope Section | |
| Vertical axis |
Resolution: 7 bits (128 points), common to
two channels |
| Sensitivity | 5 mV/div to 20 V/div, in 1-2-5 steps (12 ranges) |
| Range switching | Up, down, and auto |
| Accuracy | 3% (reference: 8 div) |
| Frequency response |
DC coupling:DC to 10 MHz (reference: 8
div), -3 dB |
|
AC coupling:10 Hz to 10 MHz (reference: 8
div), -3 dB |
|
| Input impedance | 1 MΩ ±2%, 25 pF ±5 pF |
| Vertical modes | CH1, CH2, dual, add, sub, X-Y |
| Input withstand voltage | 400 V (peak-to-peak + DC) |
| Input coupling | AC, DC, ground |
1-6
| Autoranging range | 50 Hz to 10 MHz | |
| Horizontal axis | Display resolution: 180 points | 1 |
| Sweep method | Automatic, triggered, single, roll, and scroll | |
| Sweep time |
0.1 µs/div to 20 s/div, in 1-2-5 steps (26
ranges) (with a memory size of 1.8 kwords: 10 µs/div to 200 s/div) |
|
| Accuracy | ±(0.05% + 1/2 point) | 1.8. |
| Triggered sweep | 50 ms/div to 0.1 µs/div | |
| Range switching | Up, down, auto | |
| Maximum conversion rate | Single trace: 30 MS/s, Dual trace: 15 MS/s | |
| Autoranging range | 1 µs/div to 50 ms/div | |
| Triggering | ||
| Signal source | CH1, CH2, External | |
| Coupling | DC, HF-rej | |
| Sensitivity |
CH1, CH2: 0.5 div, DC to 10 MHz
External: TTL level, DC to 10 MHz |
|
| Trigger slope | +, - | |
| Pretrigger positions |
3 points: 1 div, 6 div, and 11 div
(with a memory size of 1.8 kwords: 6 div) |
|
| Memory | ||
| Working memory | 180 words × 2 CH or 1.8 kwords × 2 CH | Seesarch d |
| Bank memory |
180 words × 10 × 2 CH or 1.8 kwords × 1
× 2 CH with battery backup |
|
| Auto setup function |
Automatic optimization of vertical-axis,
horizontal-axis and vertical position set- tings and trigger level |
|
| Print function | Hardcopy output of the display screen to a dedicated printer | |
| Waveform comparison function |
The waveform in working memory can be
displayed simultaneously with a waveform in bank memory. |
đ |
|
The waveform from bank memory is dis-
played with half contrast and the scales are blanked. |
||
| Overlaid display function |
A newly input waveform is displayed in
overlay, without erasing the old waveform. |
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Automatic peak-to-peak voltage Operates at a displayed amplitude of 1 div or measurement function greater 5 mVp-p to 160 Vp-p Measurement range 3% + [0.07 × (VOLTS/DIV setting value] Measurement accuracy Automatic frequency Operates at a displayed period of 1 div or measurement function greater 2 Hz to 10 Hz Measurement range 0.05% + [0.07 × (TIME/DIV setting value] Measurement accuracy Logic Scope Section 1.3.4 Sampling Maximum sampling frequency 15 MHz Vertical axis Number of input channels 8 ch H: 2.0 V min L: 0.8 V max. (TTL level) Threshold voltage Horizontal axis Auto, triggered, and single sweep Sweep method 1 µs/div to 50 ms/div, in 1-2-5 steps (17 Sweep time ranges) (with a memory size of 1.8 kwords: 10 µs/div to 0.5 s/div) ±(0.05% + 1/2 point) Sweep accuracy Triggering CH1, CH2, and External Signal source DC coupling: Coupling and sensitivity H: 2.0 V min. L: 0.8 max. (TTL level) Polarity +, -3 points: 1 div, 6 div, 11 div Pretriggering position
Memory
Working memory
Bank memory
180 words or 1.8 kwords
180 words × 10 or 1.8 kwords × 1 with battery backup
| Print function |
Hardcopy outp
dedicated print |
ut of the display screen to a
er |
|
|---|---|---|---|
| Input terminals |
In common wi
special probe u |
th printer output connector,
sed (sold separately) |
|
| 3.5 | Printer Output Section (LOGIC SCOPE Input Section) | ||
| Interface |
8-bit parallel
(for dedicated r |
nodel 710 Printer) | |
| Output connector | Mating cable: |
Dedicated LC-2082 printer
cable (used also as the input for the dedicated LP-2087 |
|
Memory Card (Separately Sold Option) 1.3.6
Storage capacity
| Oscilloscope mode | 180 words × 40 × 2 ch or 1.8 kwords × 4 × 2 ch |
|---|---|
| Logic scope mode | 180 words × 40 or 1.8 kwords × 4 |
| DMM mode | Storage of up to 200 data logger mode data |
| Battery used | CR2016 |
4 years at 25°C 9 months at 0° to 60°C
1.3.7 General Specifications
Battery life
DMM-to-oscilloscope isolation withstanding voltage
Probe calibration voltage
Auto power-off function
Real-time clock function
Power requirements
Power consumption
Dimensions
tween the DMM input terminals and the SCOPE ground.
1.1 kV (DC + AC peak) for one minute be-
Logic Probe)
Approx. 4 Vp-p, squarewave
If not key switch operation is made for approximately 5 minutes or longer, the power is automatically shut off.
The current time is displayed in the lower left part of the screen in the HOLD condition.
SUM-3 (LRP6) alkali batteries (4)
External DC input voltage: 6.5 V±10%
4 W. typical
240 (W) × 44 (H) × 165 (D) mm
Weight
Operating environment
Accessories
1.2 kg (not including batteries)
0 to 40°C, 10 to 80% humidity
- Arcing-protected circuit-protection fuse (0.5 A) for DMM current/resistance measurement
- DMM test leads (UL approved) (1 set)
- Waveform measurement probes (LP-16BX) (2)
- Strap (LC-2235)
- Type SUM-3 batteries (4)
Separately sold options
Accessory kit
Carrying case (LC-2234)
Memory card (LM-2900-3)
AC adaptor (LPS-1910)
the Model 300
External trigger cable (LC-2073)
Dedicated printer Model 710 Provided with printer cable for connection to
LP-2087 Logic Probe
1-10
2. OPERATING PRECAUTIONS
2.1 Avoiding Excessive Inputs
Take care that none of the input terminals of the Model 300 is subjected to input levels higher than the maximum specified levels, as this can cause burnout of input circuitry and damage to internal circuits.
(1) DMM Section
- Between V and COM 1.1 kV (p-p + DC) for 1 minute
- Between Ω and COM 250 V (p-p + DC) for 1 minute
- Between mA and COM 0.5 A (fuse protected)
(2) Oscilloscope Section
| ٠ | Vertical input terminal | 400 V (p-p + DC) , 1 kHz for 1 minute |
|---|---|---|
| ٠ | External trigger input | 100 V (p-p + DC), 1 kHz for 1 minute |
| ٠ | Probe (LP-16BX) | 600 V (p-p + DC), 1 kHz for 1 minute |
-
(3) Isolation Withstand Voltage Between the DMM and Oscilloscope Sections
- Between DMM input and 1.1 kV (p-p + DC) for 1 minute SCOPE GND
A "maximum of 400 V (p-p + DC)" refers to the condition, as shown in Fig. 2-2, in which the absolute value at the peak is 400 V.
Relatives and a first state state of the second
Replacement of the Current-Measurement Terminal Protective Fuse
When the rear battery cover is opened, the fuse can be seen next to the batteries, as shown in Fig. 2-3. Replace this fuse with a spare.
2.2 Battery Operation
(1) Battery replacement
When the battery voltage drops, the "LOW BATT" indicator on the front panel will light. If this indicator lights, it is time to replace the batteries of the Model 300.
Replace all four batteries with batteries of the same type, and avoid mixing new and old batteries.
If the Model 300 is to be left unused for a long period of time (one month or longer), be sure to remove the batteries from the Model 300 to prevent both depletion and leakage.
- Slide the battery cover in the "OPEN▶" direction to open it.
- (2) Replace all batteries with new ones, taking care to observe proper polarity.
Battery Life
(2)
Battery life will depend upon the type of battery, the ambient temperature, and the measurement conditions.
Table 2-1 gives some general value to be used as a guide in battery operation with various types of batteries.
V. MODE: DUAL, SWEEP MODE: AUTO, TIME/DIV:1ms/div
Table 2-1 Approximate Operating Times
|
Ambient
temperature |
Alkali
Batteries |
Manganese
Batteries |
Rechargeable
Nicad Batteries |
|
|---|---|---|---|---|
| 0°C | 35 min. | No operation | 1 hour | |
| 20°C | 2 hour 15 min. | 25 min. | 1 hour 15 min. | |
| 40°C | 3 hours | 45 min. | 1 hour 20 min. | |
Care is required when either the NORM or SINGLE sweep mode is selected, as the battery life is greatly shortened in the trigger wait condition.
Note: Batteries will generate heat after a long period of battery operation, but this is not an abnormal condition.
2.3 External DC Power
Take care with the polarity and input voltage.
- Input voltage 6.5 V ±10%
- Maximum input voltage 7.5 V
Use only the LPS-1910 AC adaptor (6V 800mA).
2.4 High Temperature and Humidity
Use the Model 300 in its specified operating environment of 0 to 40°C and 10 to 80% humidity. Use under severe environmental conditions can cause failures.
2.5 Avoid Excessive Shock
When carrying the Model 300, take care that it is not allowed to be dropped or otherwise subjected to excessive shock, as this can cause operational or permanent failures.
2.6 LCD Contrast
The contrast of the LCD display changes with temperature, and the overall display density increases when the ambient temperature is high. If this happens, turn the CONTRAST adjustment down to lower the screen contrast.
2.7 BANK Memory Backup
The bank memory contents are backed up by a dedicated battery. If the Model 300 is powered on for 8 hours, these contents will be held for at least one month.
3. PANEL DESCRIPTIONS
This section will describe the front panel switches, knobs, and connectors of the Model 300.
Note that each time a key switch operation is accepted by the Model 300 a beeper is sounded.
The circled numbers in this section refer to number in the drawings applied to controls and connectors.
Panel markings have been indicated in all capitals in the descriptions that follow.
Descriptions of the various switch and control groups follow.
Power Group
POWER switch (slide switch) 0
The positions of this switch (from the bottom) are EXT DC-OFF-BATT. In the BATT setting, the Model 300 is powered from internal batteries, and in the EXT DC setting, it is powered from an external AC adaptor.
2 DC 6.5V IN connector
This is the input connector for the dedicated AC adaptor. It is used in powering the Model 300 for continuous operation from the AC line.
LOW BATT indicator
This indicator lights to indicate that the supply voltage has dropped.
Display Group
LCD panel
4
The scales consist of 8 vertical and 12 horizontal divisions, which are displayed with half contrast.
(5) CONTRAST knob
This potentiometer is used to adjust the contrast of the waveforms and characters displayed on the LCD. Setting it to the top increases the display density.
3.3
Fig. 3-4
DMM function selection switch (key switch)
This switch selects the DMM function.
--------------------------------------
This switch selects the OSCILLOSCOPE function.
If the DMM switch (6) and OSCILLOSCOPE switch (7) are pressed simultaneously, both functions will be displayed simultaneously.
s 1.000C SCOPE function selection switch (key switch)
This switch selects the LOGIC SCOPE function.
SA MINI GIOUP
Fig. 3-5
3-3
- ⑨ V input terminal
- Ω/ ₩ /mA input terminal
- ① COM input terminal
The input terminals consist of V (used for voltage measurement), Ω/ # /mA (used for resistance, continuity, and current measurements), and the common terminal COM used for a variety of measurements.
Take care that the maximum allowable applied voltages for these terminals are not exceeded.
1 Function selection switches (push-lock switches)
These switches are used to select the voltage (V), resistance (Ω), continuity (Ω/ ¥ /mA), and current (A) measurement functions.
① AC/DC LPΩ/Ω switch (push-lock switch)
This switch is used to select either AC or DC for voltage and current measurements, and to switch the open-circuit measurement voltage for resistance measurements.
10 RANGE switch (push switch)
This switch is used to switch between autoranging and manual range selection, and to switch the range in the manual range selection mode. If it is held down for more than 1 second, autoranging is selected.
3.5 VERTICAL Group
(5) CH1 or X IN connector
16 CH2 or Y IN connector
These are the vertical input connectors. Their ground contacts are internally connected. Take care not to exceed the maximum allowable applied voltage limit of these connectors.
- 1 CH1 AC-GND-DC switch (slide switch)
- (B) CH2 AC-GND-DC switch (slide switch)
These switches are used to select the coupling for the signals applied to the input connectors. DC selects DC coupling, while AC selects AC coupling through a DC-blocking coupling capacitor. In the GND setting, the input of the amplifier is grounded, and the vertical-axis input terminal is open.
- (1) CH1 POSITION adjustment (rotary potentiometer)
- ② CH2 POSITION adjustment (rotary potentiometer)
These potentiometers are used to adjust the vertical position. Turning one of these knobs clockwise moves the waveform for that channel upward, and turning it counterclockwise moves the trace downward.
- ② CH1 VOLTS/DIV
- ⑦ CH2 VOLTS/DIV ◀ and ► switches (key switches)
These switches are used to switch the vertical-axis input sensitivity.
VERTICAL AUTO RANGE
This function automatically sets the input sensitivity. To enable it, press both VOLTS/DIV 4 and b switches at the same time.
Vertical operating mode selection switches ( and ) (key switches)
These switches are used to select the vertical mode (CH1, CH2, DUAL, ADD, SUB, and X-Y).
AUTO SETUP switch (key switch)
This is used to automatically set the vertical-axis input sensitivity, the position, the sweep time, and the trigger level.
29 PROBE CAL output terminal
This terminal makes available a probe calibration signal.
3.6 TRIGGER Group
LEVEL adjustment (rotary potentiometer)
This is used to adjust the trigger level which establishes the start of the triggered sweep.
② SOURCE switch (key switch)
This switch is used to select the trigger source.
28 SLOPE switch (key switch)
This switch is used to select the trigger slope.
(3) PRETRIG DIV switch (key switch)
This switch is used to establish the position of the trigger point on the sweep.
(i) HF-REJ switch (key switch)
This is used to band-limit the trigger signal. It attenuators trigger signals above 100 kHz.
(1) EXT TRIG IN connector
This is the connector for an external trigger signal. It accepts TTL logic level signals. Be careful not to exceed the maximum allowable applied voltage limit.
Rise time or Fall time: Input signal at 500 ns or low.
3.7 SWEEP Group
3 MODE- switch (key switch)
This switch is used to select the sweep function (AUTO, NORM, and SINGLE).
3 TIME/DIV ◀ and ► switches (key switches)
These switches are used to set the sweep time per division of the display.
TIME AUTO RANGE
This function sets the sweep time automatically. It is enabled by pressing both the switches at the same time.
RUN/HOLD switch (key switch)
This switch is used to start and stop measurements.
(5) HOLD indicator
This indicator lights when the measurement is stopped.
สร้างการเกิดของสร้างสาวอย่าง
3.8 FUNCTION Group
The FUNCTION group is operative when the HOLD indicator (3) is lighted.
BANK 1-10 switch (key switch)
This switch is used in the oscilloscope mode or logic scope mode to store the display screen into bank memory, and when comparing a bank memory waveform with another waveform on the display. It does not function in the DMM mode.
For details on operation, refer to Section 5.10 (Waveform Storage and Recall), Section 5.11 (Waveform Comparison), Section 6.5 (Waveform Storage and Recal), and Section 6.6 (Waveform Comparison).
3 MEMORY CARD switch (key switch)
This switch is used in the oscilloscope mode or logic scope mode to swap data stored in bank memory with data stored on a memory card. It does not function in the DMM mode.
In the NORM mode, the memory size is such that one swappable group consists of ten waveforms. In the LONG mode, one swappable group is consists of one waveform.
For details on operation, refer to Section 9 (MEMORY CARD).
③ DATA LOGGER switch (key switch)
In the DMM mode, this switch is used to print out the measured values at a fixed time interval. It is used for data logger operation, and does not function in the oscilloscope or logic scope mode.
For details on operation, refer to Section 4.5 (Data Logger Function).
③ SYSTEM switch (key switch)
In the oscilloscope mode or logic scope mode, this switch is used to:
- turn on or off the automatic measurement function that displays the peak-to-peak voltage and frequency of the input signal,
- turn on or off the auto power-off function, and
- change the calendar and time setting.
It does not function in the DMM mode.
For details on operation, refer to Section 5.12 (Automatic Input Signal Peak-to-Peak Voltage and Frequency Measurement), Section 7 (CALENDAR AND TIME SETTINGS), and Section 8 (AUTO POWER-OFF SETTING AND CANCELING).
④ SET ▲ and ▼ switches (key switches)
These switches are used to select various items and make settings when functions (b) to (b) described above are operating.
3.9 Other Group
Fig. 3-10
MEMORY SIZE switch (key switch)
This switch is used to select the working memory capture size in number of words.
ACCUM switch (key switch)
In the HOLD mode, this switch serves as the PRINT switch.
In the RUN mode, this switch serves as the ACCUMULATE (overlay) switch.
ASSING CONTRACTOR
PRINTER/LOGIC PROBE connector
This is the output connector for the dedicated printer.
It serves also as the input connector for the logic scope.
- Memory card insertion slot
- Istrap guide
- (6) Stand feet
- Battery cover Battery
4. USING THE DMM
4.1 Panel Controls Used
Fig. 4-1
4.2 Range Switching
When the DMM switch (6) is pressed to select the DMM function, the rangeswitching mode is set to autoranging.
In the autoranging mode, when the RANGE switch (1) is pressed a change is made to manual range selection.
In the manual range selection mode, each time the RANGE switch (1) is pressed the measurement range is up-ranged.
If the RANGE switch (1) is held down for longer than 1 second, a switch will be made from manual range selection to autoranging.
Ranging Operations in the Autoranging Mode
When the measurement results reach the following limits, the range is automatically switched.
| Autoranging up-range: | Switch to the next higher range at 2800 to 3199 counts |
|---|---|
| Autoranging down-range: | Switch to the next lower range at below 269 counts |
| Warning display: | When the measurement result exceeds 3199 positive counts, the display will indicate "+" and when it exceeds 3199 negative counts, it will indicate "". In addition, a beeper will sound as a warning. |
4-1
4.3 Low-Power Resistance Measurement (LPΩ)
Low-power resistance measurement is used in in-circuit measurement of resistances that are connected in parallel with diodes or transistors.
The resistance is measured with an open-circuit input terminal voltage of 0.45 V or lower. Note that because of the reduced measurement voltage, measurement accuracy is reduced.
In the DMM mode, press the Ω switch ①.
Next, press the LPQ/Q switch (). "LP" will on the LCD display panel.
Make the measurement by connecting the resistance to be measured across the input terminals () and ().
Table 4-1 shows measurement examples obtained by measuring a circuit such as shown in Fig. 4-2.
Table 4-1
| NOR | МΩ | LP | Ω | |
|---|---|---|---|---|
| R |
Measured
Value |
Error |
Measured
Value |
Error |
| 22 kΩ | 19.44 kΩ | -11.6% | 21.72 kΩ | -1.3% |
| 100 kΩ | 90.0 kΩ | -10.0% | 97.2 kΩ | -2.8% |
4.4 Diode Test and Continuity
A beeper is provided to indicate circuit continuity.
This can also be used to determine diode type and perform go/nogo diode tests.
In the DMM mode, press the # /->>>> (continuity) switch ①.
Measurement is made between the input terminals () and ().
If the displayed value falls below approximate 200 (approx. 500 Ω), the beeper will sound, indicating continuity. The following values will approximately indicate the following conditions.
| Open | Approx. 1500 |
|---|---|
| Short | Approx. 0 |
| Silicon diode | Approx. 550 |
| Germanium diode | Approx. 230 |
4.5 Data Logger Function
Using this function, the DMM measurement value is printed on a dedicated printer or output to a memory card a specified number of times at a fixed time interval.
Data stored onto a memory card can be output to a dedicated Model 710 Printer.
Procedure
This function operates in the DMM mode.
- (1) When the RUN/HOLD key ③ is pressed, the HOLD indicator ⑤ lights, indicating the HOLD condition.
- (2) When the DATA LOGGER key (3) is pressed, the data logger mode is enabled, and the data logger mode setting menu shown in Fig. 4-4 appears.
In the data logger mode, if the DATA LOGGER key ③ is pressed once again, return is made to the HOLD condition.
Transfer - Sales States of American
| Function | Setting | Setting value menu |
|---|---|---|
| • | LOGGER | SET |
| ОUТРUТ | ER PRINTER/CARD | |
| TIME | 10 M I |
N 5/10/30 SEC
1/ 5/10 MIN |
| NUMBER | 100 |
10/20/50/
100/200/∞/ |
| START | 0001 DC+0.000 V | |
| CPRINT | ||
Fig. 4-4
(3) Output Destination Setting
Set the output destination to either PRINTER or CARD.
Use the ▲ or ▼ keys ④ to bring the highlighted display section to OUTPUT of the function part of the menu.
If both the ▲ and ▼ keys are pressed at the same time for this setting, the highlighted portion of the display moves to setting value part of the display (middle column).
Use the ▲ or the ▼ key to highlight either PRINTER or CARD in the setting value part of the menu.
If both the A and V keys are pressed at the same time for this setting, the output destination is set. The highlighted portion of the display returns to the OUTPUT item.
(4) Interval Time Setting
The output interval can be set to 5 s, 10 s, 30 s, 1 min., 5 min., or 10 min.
Use the ▲ or ▼ keys ® to bring the highlighted display section to TIME of the function part of the menu.
If both the A and V keys are pressed at the same time for this setting, the highlighted portion of the display moves to setting value part of the display (middle column).
Use the ▲ or the ▼ key to select the interval time from the setting value menu.
If both the ▲ and ▼ keys are pressed at the same time for this setting, the interval time is set. The highlighted portion of the display returns to the TIME item.
(5) Number of Measurements Setting
The number of measurements can be set to 10, 20, 50, 100, 200, or ∞. Note, however, that when the output destination has been set to CARD, the number of measurements cannot be set to ∞.
Use the ▲ or ▼ keys ④ to bring the highlighted display section to NUMBER of the function part of the menu.
If both the ▲ and ▼ keys are pressed at the same time for this setting, the highlighted portion of the display moves to setting value part of the display (middle column).
Use the ▲ or the ▼ key to select the number of measurements from the setting value menu.
If both the ▲ and ▼ keys are pressed at the same time for this setting, the number of measurements is set. The highlighted portion of the display returns to the NUMBER item.
(6) Measurement Start
When the other settings have been made, use the A or V key ① to move the highlighted portion of the display to START.
If ▲ and ▼ are pressed simultaneously, operation is started.
When measurement is started, the number of measurements and measured value are displayed to the right of "START".
If the DATA LOGGER key ③ is pressed before the completion of printing, printing is stopped, and return is made to the HOLD condition.
Fig. 4-5 shows and example of a printout.
| DC. VOLTAGE | |
|---|---|
|
START TIME
INTERUAL NUMER 0002 0003 0005 0005 0005 0005 0005 0005 |
8:58341000000000000000000000000000000000000 |
← Measurement mode
Measurement starting time
← Interval time
← Number of measurements
Fig. 4-5
If the output destination is set to CARD, "INIT Y/N" might appear in the setting value column. If this happens, it is necessary to initialize the memory card.
Memory Card Initialization
If you had already been using a memory card in either the oscilloscope or the logic scope mode, to prevent accidental erasing of data, "INIT Y/N" appears to verify whether it is ok to initialize the memory card.
Remember that when a memory card is initialized, all data on the memory card is erased.
A memory card that has never been used will also require initialization.
The initialization procedure is as follows.
- With the START of the function section of the menu highlighted, press the ▲ and the ▼ keys simultaneously so that INIT Y/N is displayed.
- (2) Each time the ▲ or ▼ key is pressed, Y and N are selected alternately.
- (3) Move the highlighted portion to the Y and press ▲ and ▼ at the same time to execute the initialization.
Printout From a Memory Card
It is possible to print out data that has been stored onto a memory card.
The procedure is as follows.
- Use the ▲ or ▼ key to move the highlighted portion of the display to the CPRINT of the function column.
- (2) Press the ▲ and the ▼ keys at the same time to output data from the memory card to the printer.
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4.6 Printout of the Display Screen
The display screen can be printed out on the dedicated Model 710 Printer (separately sold option).
Connections to the Model 710
Fig. 4-7
Procedure
Press the RUN/HOLD key 3 to light the HOLD indicator 3 and enable the HOLD condition.
(2) When the ACCUM key (2) is pressed, printout begins.
Fig. 4-8 shows a printout example
| DC-3.192 V | + | DC voltage measurement |
|---|---|---|
| AC 1.895 U | ← | AC voltage measurement |
| 224.3KQ | ← | Resistance measurement |
| LP 224.3KQ | + | Low-power resistance measurement |
| DC+246.0mA | ← | DC current measurement |
4-6
5. USING THE OSCILLOSCOPE
5.1 Panel Controls Used
Fig. 5-1
When both the DMM and OSCILLOSCOPE functions are to be operated simultaneously, (1)/(2) to (1)/(2) of the DMM are also used. Note that simultaneous operation is not possible when TIME/DIV is 0.1 s/div or below for ROLL and SCROLL.
When the RUN/HOLD key 39 is in the HOLD condition, only the keys of Fig. 5-2 are operable.
Fig. 5-2
2 Probe Calibration
The accessory probe (LP-16BX) enables switching between ×1 and ×10.
In the ×10 setting, the signal at the probe tip is attenuated by 1/10 before being applied to the OSCILLOSCOPE section.
For this reason, the measured voltage values must be multiplied by 10.
This probe requires adjustment.
Fig. 5-3
Adjust the capacitance compensation trimmer to compensate for the input capacitance of the oscilloscope so that the frequency response is flat in the ×10 setting.
Make contact between the probe tip and the PROBE CAL terminal (5) and set TIME/DIV to 1 msec/div. Adjust to obtain the properly compensated waveform as shown in Fig. 5-4.
The CAL signal frequency depends upon the TIME/DIV setting.
If the probe in connected to the CAL terminal and the AUTO SETUP function is activated, the TIME/DIV setting will be 1 µs/div. When calibrating the probe, set TIME/DIV to 1 ms/div.
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5-2
5.3 Display Screen
The display screen when the oscilloscope function is operating appears as shown in Fig. 5-5.
| ③ MODE | Indicates the V.MODE ③ setting. |
|---|---|
| (b) CH1 | Indicates the CH1 input sensitivity ② setting value. |
| © CH2 | Indicates the CH2 input sensitivity Ø setting value. |
| @ MODE | Indicates the MODE setting. |
| © TIME | Indicates the sweep time 3 setting value. |
| (f) SOURCE | Indicates the TRIGGER SOURCE @ setting. |
| ® SLOPE | Indicates the TRIG SLOPE @ setting. |
| h HF-REJ | Indicates the HF-REJ @ on/off condition. |
| ① POINT | Indicates the PRETRIG DIV (2) setting value. |
| () SIZE | Indicates the MEMORY SIZE ① setting. |
| BANK NO. |
Indicates the name of the memory in which the dis-
played waveform is stored. |
| ① DISP. MODE |
Indicates the waveform capture condition (RUN,
HOLD, or READY). This is AUTO in the AUTO SETUP condition. |
| @ TIME |
Indicates the current time when the HOLD indica-
tor is lighted. |
5-3
| General Control Contro | Indicates the CH1 (19 ground level with a marker. |
|---|---|
| O CH2 GND POS | Indicates the CH2 @ ground level with a marker. |
| ⑦ TRIG LEVEL | Indicates the vertical position at which the TRIG LEVEL @ is set with a marker. |
| ( DMM |
Indicates the DMM measurement value when the DMM and oscilloscope are operating simultaneous-
ly. |
| T FREQ | Indicates the input signal frequency. |
| (§) CH1 Vp-p |
Indicates the peak-to-peak voltage of the CH1 in-
put signal. |
| ① CH2 Vp-p |
Indicates the peak-to-peak voltage of the CH2 in-
put signal. |
| (1) PRETRIG POINT cursor |
Indicates the trigger point set by the PRETRIG
DIV (2) as a horizontal position marked by a dotted line. |
| 𝔅 Scales | These are displayed with half contrast, so that they appear a bit fainter than waveforms. |
5.4 AUTO RANGE and AUTO SETUP
The Model 300 has three automatic setting functions that make optimum set tings of front panel conditions according to the input signal conditions.
| (1) | Automatic input sensitivity setting: | Sets the vertical-axis range to the optimum value. |
|---|---|---|
| (2) | Automatic sweep time setting: | Sets the horizontal-axis range to the optimum value. |
| (3) | AUTO SETUP: |
Sets the vertical-axis range and po-
sition, the horizontal-axis range, and the trigger level. |
These three automatic setting functions do not operate under the following conditions, however.
- When the TIME/DIV ③ is set to 0.5 µs/div to 0.1 µs/div (except AUTO SETUP)
- When the TIME/DIV ③ is set to 0.1 s/div to 20 s/div (except AUTO SETUP)
- When the V. MODE @ is set to ADD, SUB, or X-Y
- When the MEMORY SIZE is set to LONG
Also, these three automatic setting functions operate when the switch is pressed, and are canceled upon completion of the automatic setting.
During operation of an automatic setting function, the DISP MODE item ① on the display indicates "AUTO".
When an automatic setting operation is made, the MODE ③ is automatically set to AUTO and the HF-REJ ③ is set to off.
---------------------------------------
Fig. 5-6
(1) Automatic Input Sensitivity Setting (VERTICAL AUTO RANGE)
When the ◀ and ► VOLTS/DIV keys ② (or ◀ and ► VOLTS/DIV keys ③) are pressed at the same time, the VERTICAL AUTO RANGE function is activated.
If the amplitude of the signal under measurement is not known, when this function is turned on the signal's amplitude is sensed, and the optimum value between 5 mV/div and 20 V/div is automatically set (so that the waveform does not extend beyond the uppermost and lowermost lines on the screen).
(2) Automatic Sweep Time Setting (TIME AUTO RANGE)
When the ◀ and ► TIME/DIV keys ③ are pressed at the same time, the TIME AUTO RANGE function is activated.
If the frequency of the signal under measurement is not known, when this function is turned on, the signal's frequency is sensed, and the optimum value from 1 µs/div to 50 ms/div is set automatically (so that approximately two to five cycles of the signal are displayed).
If more than approximately five cycles of the signal are displayed even at 1 µs/div, operation is terminated at the 1 µs/div setting.
Similarly, if fewer than approximately two cycles are displayed even at 50 ms/div, operation is terminated at the 50 ms/div setting.
The channel for automatic setting depends upon the setting of V.MODE 3, and is as shown in Table 5-1.
| Operating Mode | Setting Channel |
|---|---|
| CH1 | CH1 |
| CH2 | CH2 |
| DUAL | CH1 |
Table 5-1
(3) AUTO SETUP
In addition to the above-described VERTICAL AUTO RANGE and TIME AUTO RANGE functions, the AUTO SETUP function optimizes the vertical-axis position and trigger level simultaneously.
The sweep time and trigger source settings depend upon the V. MODE ③ setting, and is as shown in Fig. 5-1.
When the AUTO SETUP key ② is pressed, the vertical-axis position and trigger level are set to fixed settings regardless of the settings of the corresponding potentiometers.
After the automatic setting is made, the automatic setting is canceled by operating these potentiometers.
5.5 Establishing Triggering to Freeze Waveforms on the Display Screen
In observing waveforms using an oscilloscope, the most important operation is that which properly freezes a waveform on the display. It is proper triggering that achieves this condition.
(1) Triggered Sweep Method
Triggered sweep modes consist of the AUTO, NORM, and SINGLE modes. Each time the MODE key ② is pressed, these switch through the sequence AUTO → NORM → SINGLE → AUTO
AUTO (automatic sweep)
With no input the sweep is in the free-run condition, with the swept trace visible on the display.
When a signal is applied, the oscilloscope goes into triggered sweep operation automatically.
Triggering is not possible when the input signal frequency is lower than 30 Hz.
- AUTO is the normally used sweep mode setting.
- NORM (triggered sweep)
In this mode, the waveform is displayed in sync with a signal set at the trigger section.
If there is no trigger signal, the last triggered signal is continuously displayed.
The NORM setting should be used with input signals of 30 Hz and lower.
SINGLE (single sweep)
This is used to measure one-time pulses and events.
(2) Trigger Signal Selection
The trigger signal source can be selected as one of the following three sources.
- CH1: Triggering is done on the signal applied at the CH1 or X IN connector (5).
- CH2: Triggering is done on the signal applied at the CH2 or Y IN connector (B.
- EXT: Triggering is done on the signal applied to the EXT TRIG IN connector D.
Each time the SOURCE key Ø is pressed, the trigger signal source is switched through the sequence CH1 → CH2 → EXT → CH1.
Normally this trigger source is set to either CH1 or CH2, depending upon the setting of V. MODE ②.
For video signals, apply the sync signal (horizontal or vertical) to the EXT TRIG IN connector (1) and use external triggering to obtain a easily frozen display.
(3) Trigger Position Adjustment
PRETRIG POINT Setting
Since the Model 300 is a digital storage oscilloscope, it is capable of observation of parts of a waveform before the trigger point.
The PRETRIG DIV key ② can be used to set the horizontal position of the trigger point on the display to 1 div, 6 div, or 11 div.
The setting condition is indicated by a dotted line cursor on the display screen.
The portion of the waveform to the right of the cursor line occurred after the trigger point, and the portion to the left of the cursor line occurred before the trigger point. This is normally set to 6 div.
If the MEMORY SIZE (1) is set to LONG, this setting is fixed at 6 div.
In the ROLL and SCROLL modes, since triggered sweep is not possible, the PRETRIG DIV key 2 does not operate in these modes.
TRIG LEVEL Setting
The TRIG LEVEL (3) sets the trigger position as a vertical position on the input signal. The TRIG LEVEL setting condition is indicated by a mark to the left of the waveform display on the screen. It normally set at the center.
In Fig. 5-7 on the following page, the TRIG LEVEL marker and PRETRIG POINT cursor intersection point is the trigger point.
5.6 Sweep Time and Display Mode
The MODE Ø, TIME/DIV Ø, and MEMORY SIZE Ø settings can be used to make the following display mode settings.
| Memory Size | NORM ( | 180 words) | LONG (1.8 kwords) | ||
|---|---|---|---|---|---|
|
Sweep Mode
Sweep Range |
AUTO/
NORM |
SINGLE |
AUTO/
NORM |
SINGLE | |
| 0.1 µs to 0.5 µs/div |
Equiv.
sampling |
Interpolated
display |
|||
| 1 µs to 5 µs/div |
Real
sampling |
Real
sampling |
|||
| 10 µs to 50 ms/div |
Real
sampling |
Real
sampling |
Real
sampling |
Real
sampling |
|
| 0.1 s to 0.5 s/div | Roll |
Real
sampling |
Real
sampling |
||
| 1 s to 2 s/div | Roll | Roll | |||
| 5 s to 20 s/div | Scroll | Roll | |||
| 50 s to 200 s/div | Roll | ||||
| 1 - 1 | 1.1 | - | * | 0 | |
|---|---|---|---|---|---|
| ' 8 | nı | P | n | -7 | |
| ~ | ~ | - |
(1) Real Sampling Mode
This is the normal operating mode.
The input signal is first captured into memory and then played back to the display.
(2) Equivalent Sampling Mode
In this mode, the waveform is displayed with a number of sweeps.
A proper waveform display is not possible with non-repetitive signals, and care is also required because inaccurate triggering will cause abnormal waveform display.
(3) Interpolated Display
In high-speed sweep ranges above the maximum sampling rate of the Model 300, the number of sampled point per sweep is reduced.
The points between actually sampled points are calculated internally and interpolated in the display.
(4) ROLL Mode
When the sweep time becomes long, because the screen update is slow, operation automatically switches to ROLL or SCROLL mode.
In the real sampling mode, the entire displayed waveform is updated by a new waveform. However, in the ROLL mode, the old waveform is sequentially replaced by the new waveform.
In this mode, sync is not achieved, and the waveform writing point moves from left to right.
(5) SCROLL Mode
In this mode, the waveform writing point is at the right edge of the screen, and the changes in input signal are recorded regardless of triggering.
The written data moves sequentially to the left, and when the left edge is reached, it is erased.
This mode emulates the action of a pen recorder, with the pen position at the right edge of the screen, the chart paper being the display screen, and the take up mechanism being the left edge of the display screen.
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5.7 Observation of One-Time Signals
This type of operation is used to observe signals that only occur one time, or those which occur at unpredictable times,
Care is required with the trigger section settings, since if proper triggering is not achieved, the waveform will not be displayed.
Procedure
(1) Press the SWEEP/MODE key @ to select "SINGLE".
"READY" will be displayed at the DISP MODE ① position on the display, indicating that the Model 300 is waiting for an input signal.
In this condition, the HOLD indicator (3) is extinguished.
- (2) When a signal is input, a waveform measurement is performed just one time, the HOLD indicator S lights, and the waveform is displayed.
- (3) If the RUN/HOLD key
Note that the SINGLE setting is not possible when the TIME/DIV setting is as follows.
- 0.1 sec div to 20 sec/div
- 0.1 µs/div and V. MODE 3 set to DUAL
5.8 Memory Configuration and Size
The Model 300 memory configuration and display operation are related as shown in Fig. 5-10.
5-10
The storage memory size can be switched between NORM (180 words) which corresponds to the display screen, and LONG (1.8 kwords) which is ten times longer.
It is possible to store the display screen into the bank memory.
The number of screens that can be stored into bank memory depends upon the memory size, as follows.
For a memory size of NORM (180 words): 10 screens
For a memory size of LONG (1.8 kwords): 1 screen
5.9 LONG Memory Mode
In the LONG memory mode, the storage memory size is ten times that of the NORM mode (i.e., 1.8 kwords).
The display is compressed to 1/10 on the horizontal axis.
Fig. 5-11
Each time the MEMORY SIZE key (1) is pressed, the memory size alternates between NORM and LONG.
In the LONG memory mode, the sweep time range is 10 µs/div to 200 s/div.
Waveform Expansion
In the LONG memory mode, it is possible to expand the waveform display tenfold along the horizontal direction.
The procedure is as follows.
- (1) When the RUN/HOLD key ③ is pressed, the HOLD indicator ④ lights, and the HOLD condition is enabled.
- (2) The display can be expanded up to ten times in 1-2-5 steps, by means of the TIME/DIV key 3.
- (3) The center of the waveform expansion can be move by means of the ▲ and ▼ keys @. A marker appears at the bottom of the display screen to indicate what part of memory contents have been expanded.
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5.10
anastana ang
Waveform Storage and Recall
It is possible to store the display screens into and play display screens back from bank memory. The bank memory is backed up by a dedicated battery, so that contents are held even with power switched off.
The number of screens that can be stored in bank memory depends upon the memory size.
For a memory size of NORM (180 words): 10 screens
For a memory size of LONG (1.8 kwords): 1 screen
Waveform Storage
Waveform storage is performed by the following procedure.
When the display screen to be stored is obtained, press the RUN/HOLD key 3.
The HOLD indicator (5) will light, and the HOLD condition will be entered.
(2) When the BANK key (3) is pressed, the BANK MEMORY mode is enabled, and the display appears as shown in Fig. 5-14. In this screen example, the MEMORY SIZE (3) is NORM.
If the MEMORY SIZE () is LONG, only bank number 10 is displayed.
In the BANK MEMORY mode, if the BANK key (3) is pressed once again, return is made to the HOLD condition.
| BANK. M | S E | ЕТ |
|---|---|---|
| З | 1 | 90/04/20 12:00 |
| 2 | 90/04/20 18:30 | |
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | ||
| 8 | 90/04/20 12:00 | |
| 9 | ||
| 1 0 | ||
| RT | ||
| BANK. M | BANK. M S |
Fig. 5-14
- (3) Use the ▲ or the ▼ key (1) to move the highlighted portion of the display to the "STORE" item in the function column.
- (4) If both ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section.
- (5) Select the bank number using the ▲ or the ▼ key ④. In doing this, only empty memory numbers will be possible to select. If all numbers have been stored into, delete unwanted memory contents.
- (6) If the ▲ and ▼ keys ④ are pressed at the same time, the waveform from working memory is stored into the specified bank number. When the storage is performed, the date and time when the storage was made will appear to the right of the bank number in the display.
Note
If the MEMORY SIZE ① is LONG, storage will not be possible unless all memory bank memory locations are empty.
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Waveform Deletion
If a bank memory location is not empty, it will not be possible to store a new waveform into the location. If this is the case, the old unwanted memory contents must first be deleted. The procedure for doing this is as follows, using the example of Fig. 5-14.
- Use the ▲ or the ▼ key ④ to move the highlighted portion of the display to the "DELETE" item in the function column.
- (2) If both ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section.
- (3) Select the bank number for deletion, using the ▲ or the ▼ key ④.
- (4) If the ▲ and ▼ keys ④ are pressed at the same time "Y/N" appears underneath the DELETE in the display.
- (5) Each time the ▲ or ▼ key @ is pressed, the highlighted portion changes alternately between "Y" and "N".
Highlight the "Y" and press both the ▲ and the ▼ key ④ to delete the contents at the selected bank memory number.
Waveform Playback
The procedure for playing back a waveform from memory is as follows.
- (1) Press the RUN/HOLD key 3 to light the HOLD indicator 3, indicating that the HOLD condition has been enabled.
- (2) Each time the ▲ or ▼ key ④ is pressed, the waveform stored in the bank memory locations are displayed.
5.11 Waveform Comparison
It is possible to obtain an overlaid display of a waveform which is stored at a specified bank memory number with the working memory waveform.
The bank memory waveform is displayed with half-tone contrast, and the scales are blanked when doing this.
The contents of the working memory remain in the character display area.
Note
If the bank memory waveform was from the LONG memory mode, waveform comparison is not possible.
The procedure is as follows.
- Press the RUN/HOLD key I to light the HOLD indicator I, indicating that the HOLD condition has been enabled.
- (2) When the BANK key (3) is pressed, the BANK memory mode is enabled, and the display screen appears as shown in Fig. 5-14.
Comparison of a Held Waveform With One in Bank Memory
The procedure is as follows.
- Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "COMP" of the function section.
- (2) If both the ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section of the display.
- (3) Use the ▲ or the ▼ key ④ to select the bank number.
- (4) When the ▲ and ▼ keys ④ are pressed at the same time, the waveform of the specified bank number is displayed overlaid on the waveform from working memory.
Comparison Between Waveforms From Bank Memory
It is possible to make a comparison after transferring the waveforms into working memory.
The procedure is as follows.
- (1) Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "RECALL" of the function section.
- (2) If both the A and V keys (1) are pressed to make the setting, the highlighted portion moves to the selection section of the display.
- (3) Use the ▲ or the ▼ key ④ to select the bank number.
- (4) When the ▲ and ▼ keys @ are pressed at the same time, the bank number is set, and the waveform in the selected bank number is transferred into the working memory.
It is possible to obtain a comparison display with the same procedure as followed to compare a "held" waveform with one in bank memory.
Note
When RECALL is used to play back a waveform from bank memory, the waveform that had been in working memory is lost.
5 12 Automatic Input Signal Peak-to-Peak Voltage and Frequency Measurement
The peak-to-peak voltage and frequency of the input signal can be measured, and the results of these calculations can be displayed on the screen.
For 2-channel simultaneous operation, the frequency display is that of the CH1 signal.
Automatic Input Signal Peak-to-Peak Voltage Measurement
Measurement accuracy depends upon the displayed waveform deflection, and decreases for a small-almplitude waveform. At a displayed amplitude of less than 1 division, since measurement error is large, a " ------ " display results.
When using a 1/10 probe for the measurement, the values displayed must be multiplied by 10.
Automatic Frequency Measurement
In automatic frequency measurement, the frequency is calculated from the period of the displayed waveform and this value is displayed.
The measurement accuracy will depend upon the displayed period of the waveform, decreasing as the period becomes short (i.e., as the number of displayed cycles increases).
At a displayed period of less than 1 div, since measurement error is large, a "....." display results.
In the case of complex waveforms such as those of video signals, care is required, as erroneously measured values may be displayed.
Note also that the portion a waveform that is overlapping with the automatically measured value display will disappear.
Enabling the Automatic Input Signal Peak-to-Peak Voltage (Frequency) Measurement Mode
The procedure is as follows.
- Press the RUN/HOLD key
- (2) When the SYSTEM key (2) is pressed, the system setting mode is enabled.
In this system setting mode, if the SYSTEM key ③ is pressed once again, return is made to the HOLD condition.
| Function | Setting |
|---|---|
| SYSTEM | MSET |
| VOLT | 0 N |
| FREQ | 0 N |
| AUTO. PW. OFF | 0 F F |
| CLOCK | 90/04/20 17:20 |
Fig. 5-16
5-16
新闻的 ////////////////////////////////////
- (3) Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "VOLT (FREQ)" of the function section of the display.
- (4) If both the ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion of the display moves to the setting area.
- (5) Each time the ▲ or ▼ key ④ is pressed, the status switches alternately between ON and OFF.
- (6) Press the A and V keys (1) at the same time to make the setting.
5.13 Display Screen Printout
The display screen can be printed out using the dedicated Model 710 printer (separately sold option).
Connections to the Model 710
Refer to Fig. 4-6.
Procedure
- (1) Press the RUN/HOLD key ③ to light the HOLD indicator ⑤, indicating that the HOLD condition has been enabled.
- (2) When the ACCUM key (2) is pressed, the printout begins.
Fig. 5-18 shows a printout example.
Fig. 5-18
5-17
6. USING THE LOGIC SCOPE
6.1 Panel Controls Used
Manageratic a Strangen of Cod
Fig. 6-1
Fig. 6-2
6.2 Logic Probe (Separately Sold Option)
Using the separately sold LP-2087 Logic Probe, it is possible to make timing observations of 8 channels of logic signals.
The printer output connector serves as the input connector for the logic probe.
In making signal observations, use only the Leader LP-2087 Logic Probe.
6.3 Display Screen
When the logic probe function is operating, the display screen appears as shown in Fig. 6-4.
exert-secondensisten in
Fig. 6-4
| ③ MODE | Indicates the MODE @ setting. |
|---|---|
| (b) TIME | Indicates the sweep time 3 setting value. |
| © SOURCE | Indicates the TRIGGER SOURCE @ setting. |
| @ SLOPE | Indicates the TRIG SLOPE @ setting. |
| POINT | Indicates the PRETRIG DIV @ setting value. |
| ① SIZE | Indicates the MEMORY SIZE (1) setting. |
| ® BANK NO. |
Indicates the name of the memory in which the dis-
played waveform is stored. |
| b DISP. MODE | Indicates the waveform capture condition (RUN, HOLD, or READY). |
| () TIME |
Indicates the current time when the HOLD indica-
tor is lighted. |
| ③ PRETRIG POINT cursor |
Indicates the trigger point set by the PRETRIG
DIV (2) as a horizontal position marked by a dotted line. |
| & Scales | These are displayed with half contrast, so that they appear a bit fainter than waveforms. |
6.4 Memory Size and Sampling Frequencies
The storage memory size can be switched between NORM (180 words) which corresponds to the display screen, and LONG (1.8 kwords) which is ten times longer.
In the LONG memory mode, although the length is ten times that of the NORM mode, this is displayed in 1/10 compressed form on the display screen.
Table 6-1 shows the relationship between sweep range and sampling frequency.
| Sweep Sampling Fr | Frequency | equency Sweep | Sampling Frequency | |||||
|---|---|---|---|---|---|---|---|---|
| s/div | 180 words | 1.8 kwords | s/div | 180 words | 1.8 kwords | |||
| 1 µs | 15 MHz | 1 ms | 15 kHz | 150 kHz | ||||
| 2 | 7.5 | 2 | 7.5 | 75 | ||||
| 5 | 3 | 5 | 3 | 30 | ||||
| 10 | 1.5 | 15 MHz | 10 | 1.5 | 15 · | |||
| 20 | 750 kHz | 7.5 | 20 | 750 Hz | 7.5 | |||
| 50 | 300 | 3 | 50 | 300 | 3 | |||
| 0.1 ms | 150 | 1.5 | 0.1 s | 1.5 | ||||
| 0.2 | 75 | 750 kHz | 0.2 | 750 Hz | ||||
| 0.5 | 30 | 300 | 0.5 | 300 | ||||
Table 6-1
and the second
6-3
6.5 Waveform Storage and Recall
It is possible to store the display screens into and play display screens back from bank memory. The bank memory is backed up by a dedicated battery, so that contents are held even with power switched off.
The number of screens that can be stored in bank memory depends upon the memory size.
1 screen
For a memory size of NORM (180 words): 10 screens
For a memory size of LONG (1.8 kwords):
Waveform Storage
The procedure is as follows.
When the display screen to be stored is obtained, press the RUN/HOLD key 3.
The HOLD indicator (3) will light, and the HOLD condition will be entered.
(2) When the BANK key (3) is pressed, the BANK MEMORY mode is enabled, and the display appears as shown in Fig. 6-6. In this screen example, the MEMORY SIZE (1) is NORM.
If the MEMORY SIZE (1) is LONG, only bank number 10 is displayed.
In the BANK MEMORY mode, if the BANK key (1) is pressed once again, return is made to the HOLD condition.
Function Selection Bank number
| BANK. N | A SE | ΞТ | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| STORE | 3 | 1 | 9 ( | 0/0 | 4, | 12 | 0 | 1 | 2 | : | 0 | 0 |
| 2 | 9 ( | 0/0 | 4/ | 2 | 0 | 1 | 8 | : | 3 | 0 | ||
| RECAL | , L | 3 | ||||||||||
| 4 | ||||||||||||
| COMP | 5 | |||||||||||
| DELET | 1 F | 0 | ||||||||||
| DELEI | E | 0 | 0 ( | 0 / 0 | 1 | 12 | 0 | 1 | 2 | 0 | 0 | |
| a | 51 | 0/0 | 4/ | 4 | U | 1 | 4 | • | 0 | U | ||
| 1 0 | ||||||||||||
| RT |
- (3) Use the ▲ or the ▼ key ④ to move the highlighted portion of the display to the "STORE" item in the function column.
- (4) If both ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section.
- (5) Select the bank number using the ▲ or the ▼ key ④. In doing this, only empty memory numbers will be possible to select. If all numbers have been stored into, delete unwanted memory contents.
- (6) If the ▲ and ▼ keys ④ are pressed at the same time, the waveform from working memory is stored into the specified bank number. When the storage is performed, the date and time when the storage was made will appear to the right of the bank number in the display.
Note
If the MEMORY SIZE ④ is LONG, storage will not be possible unless all memory bank memory locations are empty.
Waveform Deletion
If a bank memory location is not empty, it will not be possible to store a new waveform into the location. If this is the case, the old unwanted memory contents must first be deleted. The procedure for doing this is as follows, using the example of Fig. 6-6.
- Use the ▲ or the ▼ key ④ to move the highlighted portion of the display to the "DELETE" item in the function column.
- (2) If both ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section.
- (3) Select the bank number for deletion, using the ▲ or the ▼ key .
- (4) If the ▲ and ▼ keys ④ are pressed at the same time "Y/N" appears underneath the DELETE in the display.
- (5) Each time the ▲ or ▼ key ④ is pressed, the highlighted portion changes alternately between "Y" and "N".
Highlight the "Y" and press both the ▲ and the ▼ key ④ to delete the contents at the selected bank memory number.
Waveform Recall
The procedure for playing back a waveform from memory is as follows.
- Press the RUN/HOLD key ③ to light the HOLD indicator ⑤, indicating that the HOLD condition has been enabled.
- (2) Each time the ▲ or ▼ key ④ is pressed, the waveform stored in the bank memory locations are displayed.
6.6 Waveform Comparison
It is possible to obtain an overlaid display of a waveform which is stored at a specified bank memory number with the working memory waveform. The bank memory waveform is displayed with half-tone contrast, and the scales are blanked when doing this.
The contents of the working memory remain in the character display area.
Note
If the bank memory waveform was from the LONG memory mode, waveform comparison is not possible.
The procedure is as follows.
- Press the RUN/HOLD key 3 to light the HOLD indicator 3, indicating that the HOLD condition has been enabled.
- (2) When the BANK key (2) is pressed, the BANK memory mode is enabled, and the display screen appears as shown in Fig. 6-6.
Comparison of a Held Waveform With One in Bank Memory
The procedure is as follows.
- Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "COMP" of the function section.
- (2) If both the ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section of the display.
- (3) Use the ▲ or the ▼ key ④ to select the bank number.
- (4) When the ▲ and ▼ keys ④ are pressed at the same time, the waveform of the specified bank number is displayed overlaid on the waveform from working memory.
Comparison Between Waveforms From Bank Memory
It is possible to make a comparison after transferring the waveforms into working memory.
The procedure is as follows.
- Us the ▲ or ▼ key ④ to move the highlighted portion of the display to the "RECALL" of the function section.
- (2) If both the ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion moves to the selection section of the display.
- (3) Use the ▲ or the ▼ key ④ to select the bank number.
- (4) When the ▲ and ▼ keys ④ are pressed at the same time, the bank number is set, and the waveform in the selected bank number is transferred into the working memory.
It is possible to obtain a comparison display with the same procedure as followed to compare a "held" waveform with one in bank memory.
Note
When RECALL is used to play back a waveform from bank memory, the waveform that had been in working memory is lost.
6.7 Display Screen Printout
The display screen can be printed out using the dedicated Model 710 printer (separately sold option).
Connections to the Model 710
Refer to Fig. 4-6.
Procedure
Press the RUN/HOLD key
(2) When the ACCUM key (2) is pressed, the printout begins.
Fig. 6-8 shows a printout example.
Fig. 6-8
7. CALENDAR AND TIME SETTINGS
Fig. 7-1
Setting the Current Time
The procedure is as follows.
- (1) Press the RUN/HOLD key (3) to light the HOLD indicator (5), indicating that the HOLD condition has been enabled.
- (2) When the SYSTEM key 3 is pressed, the system setting mode is enabled.
In this system setting mode, if the SYSTEM key ③ is pressed once again, return is made to the HOLD condition.
FunctionSettingSYSTEM SETVOLTONFREQAUTO. PW. OFFOFFCLOCK90/04/20
7-1
- (3) Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "CLOCK" of the function section of the display.
- (4) If both the ▲ and ▼ keys ④ are pressed to make the setting, the highlighted portion of the display moves to the year setting area.
- (5) Each time the ▲ or ▼ key ④ is pressed, the value changes.
- (6) Press the ▲ and ▼ keys ④ at the same time, the screen proceeds to the next setting.
Follow the same procedure as for the year setting to make the month, day, hour, and minute settings, in this sequence. Remember that the time is expressed on this clock using 24-hour clock notation.
After setting the minute, press the A and V keys (1) simultaneously to enter the current time setting.
Note
It is not possible to set non-existing dates.
8. AUTO POWER-OFF SETTING AND CANCELING
When the auto power-off function is enabled, power is automatically shut off if there is not key switch or potentiometer operation for longer than 5 minutes.
Procedure
- Press the RUN/HOLD key
- (2) When the SYSTEM key (3) is pressed, the system setting mode is enabled.
In this system setting mode, if the SYSTEM key ③ is pressed once again, return is made to the HOLD condition.
| Function | Setting | |
|---|---|---|
| SYS | TEM SET | |
| VOLT | 0 N | |
| FREQ | 0 N | |
| AUTO. PW. O | FF OFF | |
| CLOCK | 90/04/20 17:20 | |
Fig. 8-1
- (3) Press the ▲ or the ▼ key ④ to move the highlighted portion of the display to the "AUTO.PW OFF" of the function section.
- (4) If both ▲ and ▼ keys ④ are press at the same time, the highlighted portion of the display will move to the ON/OFF setting item.
- (5) Each time the ▲ or the ▼ key alternately between ON and OFF.
If both ▲ and ▼ keys ④ are pressed at the same time when ON is displayed, the auto power-off function is enabled.
If both ▲ and ▼ keys ④ are pressed at the same time when OFF is displayed, the auto power-off function is canceled.
9. MEMORY CARD
9.1 Using the Memory Card
The Model 300 can be used in combination with a separately sold memory card (LM-2900-3) to expand memory capacity.
The memory card can be used in the data logger, oscilloscope, and logic scope modes.
In the oscilloscope and logic scope modes, one memory card is used to store waveforms.
In the data logger mode, it is possible to store data on the memory card, with the memory card replacing the printer as the output device, although sharing with other modes is not possible.
For use of the memory card in the data logger mode, refer to Section 4.5 (Data Logger Function).
In the oscilloscope mode or logic scope mode, the memory card is used as follows.
In the MEMORY CARD (external memory control) mode, it is possible to swap contents of bank memory in block units, storage of up to 4 blocks being possible.
Fig. 9-1
Insert the card into the memory card insertion slot () in the direction of the arrow with the seal facing up until it locks into place.
The procedure is as follows.
- Press the RUN/HOLD key
- (2) When the MEMORY CARD key (2) is pressed, the MEMORY CARD mode is entered, and the display appears as shown in Fig. 9-3
In the MEMORY CARD mode, if the MEMORY CARD key ③ is pressed once again, return is made to the HOLD condition.
| Function | Selection | М | emory ban | k number | |
|---|---|---|---|---|---|
| CARD. M | SET | ||||
| CHANGI | E G 1 | G 1 | G 2 | G 3 | G 4 |
| * 0 1 | 1 1 | 31 | |||
| * 0 2 | *12 | 32 | |||
| DELETI | Ε | * 0 3 | 13 | 33 | |
| * 0 4 | 14 | 34 | |||
| Y/1 | V | * 0 5 | 15 | 3 5 | |
| * 0 6 | *16 | 36 | |||
| INIT | 07 | 17 | 37 | ||
| 08 | 18 | 38 | |||
| Y/1 | V | 09 | 19 | 39 | |
| 10 | 2 0 | * 3 0 | 40 |
* indicates already written into memory locations.
Fig. 9-3
Card Initialization
When using a new card for the first time, it is necessary to initialize the card. When any card is thus initialized, any previous contents are lost. The initialization procedure is as follows.
- With the START of the function section of the menu highlighted, press the ▲ and the ▼ keys simultaneously so that INIT Y/N is displayed.
- (2) Each time the ▲ or ▼ key is pressed, Y and N are selected alternately.
- (3) Move the highlighted portion to the Y and press ▲ and ▼ at the same time to execute the initialization.
Swapping Bank Memory With the Contents of a Specified Block
This operation (CHANGE) exchanges the contents of a specified block of a memory card with the bank memory contents. The procedure is as follows.
- Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "CHANGE" of the function section.
- (2) If both the ▲ and ▼ keys ④ are pressed at the same time to make the setting, the highlighted portion moves to the selection section.
- (3) Use the ▲ or ▼ key ④ to select the memory block number.
(4) If the ▲ and ▼ keys ④ are pressed at the same time, the data of the specified memory block is exchanged with all the data in bank memory.
Deletion of a Specified Block
This operation (DELETE) deletes a specified memory block. The procedure is as follows.
- Use the ▲ or ▼ key ④ to move the highlighted portion of the display to the "DELETE" of the function section.
- (2) If both the ▲ and ▼ keys ④ are pressed at the same time to make the setting, the highlighted portion moves to the selection section.
- (3) Use the ▲ or ▼ key ④ to select the memory block number.
- (4) If the ▲ and ▼ keys ④ are pressed at the same time to make the setting, the specified memory block number is set and "Y/N" appears beneath the DELETE item on the display.
- (5) Each time the ▲ or ▼ key ④ is pressed, the highlighted position alternates between "Y" and "N". Select "Y" and press both ▲ and ▼ keys ④ at the same time to delete the specified memory block.
9.2 Battery Replacement and Data Protection
The LM-2900-3 Memory Card that is used with the Model 300 is a RAM memory card which contains its own internal backup battery.
The battery life is four years at 25°C. When the end of the battery life is exceeded, the data stored on the memory card is lost, so that periodic replacement is necessary.
Battery Replacement
Insert the memory card into the Model 300 and apply power when replacing the battery. If the power is switched off, or an attempt is made to replace the battery with the card no inserted into a powered-up Model 300, stored data will be lost.
The procedure is as follows.
- Use a thin flatblade screwdriver or similar tool to push out on the battery case groove in the direction of the arrow as shown in Fig. 9-4.
- (2) Complete remove the battery case from the memory card, and insert a new battery, with the + side facing upwards.
- (3) Replace the battery case.
- Note: The battery used is a type CR1016 lithium battery.
Fig. 9-4
Data Protection
To prevent accidental deletion of valuable data, the memory card features a protect switch.
- WRITE: In this setting, it is possible to write data onto the memory card. This is the normal setting.
- PROTECT: In this setting, writing of data onto the card is prohibited, so that it is not possible to use a card set this way in oscilloscope or logic scope mode bank memory data exchange, or in storage of data onto the memory card in the data logger mode.
in same states the second
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