LEADER 3100D

1

http://nice.kaze.com/av/3100d-no2.html

LEADER 3100D

On December 13, 2009, Yahoo auctioned a junk of

LEADER 3100D of 100 MHz DSO (Digital Storage

Oscilloscope) with 5,500 yen including tax.

Waveforms can be stored in memory and displayed.

Of course, it can also be used as a real display analog

oscilloscope.

There is also a lead-out function, it is very convenient.

Sensitivity · Voltage and time (frequency) etc. can be

found without counting the sweep range or screen

mesh.

Recently, the used price of the cathode ray tube

oscilloscope is decreasing. Is it because of the LCD TV

boom in the world? If it was five years ago, you can buy an oscilloscope that is over 50,000 yen in second hand at less

than 10,000 yen. The CRT oscilloscope is still easier to capture the fine waveform change than the digital ossescope.

Fixed price vs If you consider used prices, it may be worth more than the vintage FM tuner.

The auction comment from the auctioneer is below

I recently acquired it, it was able to be used normally for several days but suddenly the waveform is no longer

displayed

Waveform display can not be performed for both CH1 and CH2.

Adjusting the vertical position and the horizontal position only works CH2. Things like horizontal lines will move

accordingly.

Both lead-out cursors can be selected and move normally.

The lead-out character is displayed, and when you change the setting the display changes accordingly.

The exhibit is below

3100D body

Probe × 2

AC power cord

Front panel cover (LC-2074 optional 5,600 yen)

Copy of instruction manual × 2 volumes

The appearance is suitable for a year and there is no

big dent or scratch

There are no scratches and dirt on the waveform

display surface and it is very beautiful.

The knobs and buttons on the front panel are

beautiful.

There is no dust on the rear fan and it is beautiful.

The handle is locked normally at the desired angle.

2


I checked it as it was being sent

Allele ~ ~ ~ There is not a bad place anywhere! ! !

The power supply will be on properly and the display lamp will be initialized.

When you enter the measurement signal, the trigger is honed properly and the waveform is displayed.

Lead-out cursor also appears and its measurement is normal.

Waveform digital storage function is also normal.

There is no burn-in tube burning, the focus is good, the observed waveform converges considerably fine and

good.

Although it is beautiful on the whole, there are dirt like scratches.

The problem was reproduced after 1 day! ! !

Immediately after obtaining it was normal but the defect was reproduced on the next day. Auction is as

commented on.

Is there a problem occurrence timer structured in this 3100D? What? What?

I tried opening the cover

The picture on the right is an interior view from

the top. It is an orderly making like a measuring

instrument. Click on the picture to view the

enlarged picture.

The chassis is made of aluminum plate.

The cathode ray tube is Toshiba 150CWB31.

I am using a high-grade glass epoxy substrate

that was subjected to a green resist.

The two large boards seen from the top are

the Control & Digital section. The LATTICE GAL 16

VBA - 25 QP and the EP - ROM of Fujitsu MBM 27 C

512 - 15 on it are mounted on the IC socket.

A shield Ni - MH rechargeable battery of 3.6 V 50 mAh is mounted on the upper board. It is for backing up

memory.

The aluminum box attached to the rear panel at the bottom right of the photo is the switching power supply.

Based on the lot number of IC used, this 3100D is probably made in 1991.

3


The picture on the right is what I looked at from

the bottom. Click on the picture to view the

enlarged picture.

The large board is the analog section.

On the side visible from this picture, five

more daughter boards are mounted, and the

packing density is quite high.

Imposition parts are heavily used, and repair

at the time of breakdown (parts are too small) is

difficult.

Although there is a metal cover on the

bottom side of the board, there is a circuit of about -1,600 V in the inside part of this cover, it is dangerous to touch it

inadvertently. The "red colored mark" is displayed on the metal cover.

You can see a black cap on the left side of the metal cover, but here it is more dangerous as + 15,000 V is hanging.

There are quite a lot of adjustment volume and trimmer capacitor. It is designed to make all adjustments from the

side of this picture.


the right side.

There is no board etc. on this side.

The frame structure of the enclosure is well

understood. Although the strength of the

aluminum material is lower than that of the iron

plate, the frame structure is devised and the strength is raised.

Why it is basically based on aluminum material, it is to lighten it and not to influence (magnetism) to electron

beam irradiation of a cathode ray tube.


the left side. Click on the picture to view the

enlarged picture.

The board that can be seen from this side is a

vertical amplifier board. Y +, Y - vertical drivers are

also on this board.

Vertical amplifier board has many adjustment volume and trimmer capacitor.

A slightly thick gray coaxial cable that is visible on the right side near the CRT is the delay line.

4


Repair

1. Repair

No waveform appears

Looking at the internal maintenance

seal, it seems that it has been repaired

twice, "November 6, 1998" and

"November 30, 2009".

I doubt it is here

I asked LEADER to repair

"November 30, 2009".

And 5 days later "December 5,

2009" Yahoo auction is exhibited as a junk

item.

Then, it is natural to think that LEADER has sent Yahoo auctions as being said to be unrepairable.

Anxiety saying that it may be difficult to repair · · · came across my head.

Junk is almost like this.

Those who do not have confidence in their arms will not let out their hands, but they are Ikemasen.

When checking the internal

connectors, the F cable of the P6 connector

of the photo was completely diagonally

entered

P6 is the smaller one of the white

connectors from which the F cable is

unplugged.

Lightly lift both sides of the white

connector to disengage the latch so that

you can connect and disconnect the cable.

When P6 connector is correctly

reinserted, the waveform will now come

out.

Since the failure of this time was poor contact of the connector part, it disassembled into pieces and

cleaned all the connectors with anhydrous alcohol. I think that it was fixed completely.

The [POSITION] knob of the CURSOR part was on the verge of grease

This was completely fixed by inserting high-viscosity grease for binoculars over the shaft over time.

5


While inserting heat with a soldering iron, inserting grease goes well.

2. cleaning

The interior blew away the trash using a blower and brush.

The exterior wiped the dirt with multi cleaner D413 substitute for OA cleaner which

started using the whole recently. The front panel became beautiful.

The knobs were also cleaned with a multi-cleaner.

Setting menu

Since the 3100D uses a microcomputer, it has intelligence as well. As one

of them, there are menus that allow you to set display units and so on. To

display the main menu, press the [MENU] button.

Select the sub menu from the main menu and set the parameters.

Submenu depth varies.

The table below is the menu tree. Parameter defaults look like red

letters.

It is pleasing to be able to display dB and comment privately.

6


MAIN MENU SUB MENU Setting parameters

STORAGE

EQU.SAMPLING OFF

ON

AVERAGING

OFF

2

4

8

16

32

64

128

256

SMOOTHING OFF

ON

INTERPOLATION

OFF

PLS

SIN

PLOTTER

FUL

1/4

2/4

3/4

4/4

VIEWTIME

OFF

1S

2S

5S

CURSOR/MEASURE

MEASURE MODE

CURSOR

GO/NO-GO

PARAMETER

MEASURE SELECT

CURSOR

CURSOR LINE

2 LINES

4 LINES

2 + 1(SUB) LINES

2 + 2(SUB) LINES

CURSOR UNIT

VOLT (⊿V)

V

%

dB

TIME (⊿T) s

%

FREQ (1/⊿T) Hz

°

PARAMETER

PEAK-PEAK

TOP-BASE

OVERSHOOT

UNDERSHOOT

RISE TIME

FALL TIME

PULSE WIDTH

PERIOD

FREQUENCY

TV LINE

AUTO

525

625

COMMENT

COMMENT1

DISPLAY OFF

ON

EDIT CHARACTER

Enter a character string (maximum 28

characters)

POSITION Set position of character string

COMMENT2

DISPLAY OFF

ON

EDIT CHARACTER Enter a string (up to 10 characters)


COMMENT3

DISPLAY OFF

ON

EDIT CHARACTER Enter a string (up to 10 characters)


GP-IB DELIMITER

CR/LF

LF

ADDRESS Set GP-IB address

7


I tried it

1. Front panel

If you set the [STORAGE / REAL] switch to [STORAGE], you can use it as

DSO, and if you set it to [REAL] it can be used as an analog oscilloscope.

The operation when using it as an analog oscilloscope is easy. It will be

ready for DSO as well. The operation system is good.

There is no time unit of sweep time and input sensitivity display on the

rotary dial. Since the units of sensitivity and time axis are displayed together

with the waveform on the CRT screen, no display is required on the dial.

2. Rear panel

The power supply terminal is the same 3P type as the PC. Since the built-in power supply is a switching method,

the corresponding range of the input voltage is wide. It corresponds to AC 90 to 250 V / 48 to 440 Hz, and it can be

used around the world.

FUSE is 2A time lag type.

[EXT CLK INPUT] [GO / NO - GO OUTPUT (2)] [CH1 OUTPUT] [Z AXIS INPUT] There is a BNC terminal.

There is GP - IB connector.

If you connect a HPGL-compatible printer or plotter here, it seems that you can hard copy the observed

waveform.

8


There are many freeware & shareware that simulate HPGL.

Hardware and drivers that use the parallel port of the personal computer as the GP - IB interface are also made

public on the net.

Therefore, if it is devised, it seems that it can capture hard copy to the personal computer.

3. AUTO RANGE function

This is funny! It is a stupid function. We will automatically switch the sensitivity and change the time axis so that

the observed waveform fits inside the Braun tube.

This function works when you press the [VOLTS / DIV] [TIME / DIV] knob to light up the [AUTO RANGE] lamp.

4. On-screen label function

It is a function to add an optional comment to the observation screen and display it. Alphanumeric characters can

be used for characters.

It is convenient when photographing and saving the observation screen.

5. Delay sweep function

You can expand the time axis using B sweep for the waveform captured by A sweep. The usage is below.

When you press the [A] button of [HORIZ DISPLAY], it becomes A sweep. In this state, display an arbitrary

waveform.

When you press the [ALT] button, the waveform displayed by A sweep and the waveform displayed by B sweep

are displayed on the cathode ray tube surface.

You can change the B sweep time with the [TIME / DIV] knob.

If (B sweep time) <(A sweep time), a part of A sweep waveform should be displayed somewhat bright. This part

is expanded in time axis with B sweep.

By turning the [POSITION] knob of the CURSOR section, you can move this bright part and see what part is

expanding the time axis.

The [POSITION] knob and the [TIME / DIV] knob can be used to change the magnified part and the enlargement

time arbitrarily.

By pressing the [B] button, only the enlarged waveform can be displayed.

The vertical position of the enlarged waveform can be moved with the [TRACE SEP] control.

6. DSO function

How to use DSO mode

9


Set the [STRAGE / REAL] switch to the [STRAGE] side to enter the DSO mode. The result of "A / D conversion →

D / A conversion" of the input waveform on the cathode ray tube surface is displayed in realism.

To record a waveform, stop the waveform with the [HOLD] switch and press the [STORE] button to write it to

the internal memory.

To call up and display the stored waveform above, press the [RECALL] switch.

To hard copy the waveform captured by DSO to the GP - IB plotter, stop the waveform with the [HOLD] button

and press the [COPY] button.

How much can you use at a sampling rate of 40 MS / s?

Sampling the sine wave frequency ft with the sampling frequency fs will also generate alias frequencies of | ft -

fs | and | ft + fs |. This phenomenon always occurs in frequency multiplication and is also called "aliasing noise".

It is a funny story that I am planning to observe ft, actually I was watching ft-fs aliasing. This is a disadvantage of

DSO. fs want more than 100 times ft.

Therefore, if it is 40 MS / s, it is the observation limit up to 400 kHz. This level is sufficient for low frequency

observation but high frequency is impossible. It is not to overstage DSO.

The right picture is a DSO observation of a 10 MHz sine wave.

It does not seem like a very sine wave. Since the 10 MHz signal has a

sampling frequency of 40 MHz, the horizontal resolution that can express one

cycle is only 4 points.

Since the time for one horizontal point appears to be moro, I

measured this time with the lead - out cursor. Since it is 25.0 ns, it is 40 MHz

in terms of frequency conversion. I could prove that the sampling rate of 3100

D is 40 MS / s.

It is better to think about the 3100D DSO mode to about a low frequency omake.

7. Waveform observation example

When observing a signal of 10 MHz in real, it was displayed as

shown in the picture on the right.

[Input Channel] [Sensitivity] [Time / DIV] is displayed at the lower

left of the screen.

The X axis is A sweep 50 ns / div, and the Y axis shows that AC

coupling is carried out at 1 V / div.

Lead-out cursor

In 3100D, two pairs of lead-out cursors, X axis and Y axis, appear.

A total of 4 readout cursors can be moved to any position.

10


In this example, the cycle and wave height value of one cycle of the waveform are measured using the lead-out

cursor. The measurement result is displayed on the upper right of the screen. The period is 100.0 ns and the crest

value is 4.25 Vp-p.

8. Comprehensive evaluation

It is sufficient performance for waveform observation of audio system mainly for FM receiver. Since the band is

100 MHz, it is enough for FM IF 10.7 MHz observation and it can be used for RF system observation.

The lead-out function is quite good. The merit is below.

Since the unit of measurement is displayed on the screen together with the waveform, there is no

misunderstanding of units.

(Since you do not need to read the dial scale, you can observe without leaving your eyes on the screen.

Skill is required to read the observed waveform from the scale on the X and Y axes, but if you use the lead out

cursor, the 3100D will calculate automatically, so anyone can easily and accurately read it.

In the analog oscilloscope, if you read the observed waveform from the scale on the X and Y axes, you will get

an error by all means. The same is true for the 3100D, but with the lead-out cursor it can be read without error (with

the accuracy of the crystal oscillator).

The 3100D has good operability and can be recommended.

Since the vertical sensitivity is 0.5 mV / div, considerable microwave waveforms can be observed.

The fully automatic function called AUTO RANGE is extremely appreciated. Even if you change the

measurement point of the probe, it automatically sets observation. You can focus on observation work.

Move the lead-out cursor The operability of the [POSITION] knob is good.

Even at the same rotation angle, when you turn it quickly, the cursor position change is large, and when you

rotate it slowly, the cursor position change becomes minute.

The demand to quickly and accurately to the target position is satisfied. The control program by the built-in

microcomputer is excellent.

From the Panasonic VP-5020A, the waveform is displayed in a sharp manner and operability is also good.

Waveforms and characters are sharper than VP-5020A. I think that a CRT is good.

The rank as an oscilloscope is different. I think that the price is far higher than VP-5020A.

It is estimated, but it seems that the 3100D had exceeded the list price of 500,000 yen.

Fans are constantly turning, but quiet for that. It is grateful to be quiet in personal use.

11


9. Tricks

If you press the [VOLT] and [TIME] buttons of the [CURSOR] section at the same time and press both buttons as

well, the ⊿ T indication will be 1 / ⊿T and the frequency will be displayed.

If you press the [VOLT] and [TIME] buttons of the [CURSOR] section lightly and put both of them pressed up, the

lead-out cursor display at the top will disappear. The measurement unit display at the bottom remains displayed.

Cursor display may be troublesome depending on the observation situation, which is useful in this case.

specification

Even if you search on the net, 3100 D information will hardly hit.

· · · Accurate information of LEADER 3100D is being recruited · · ·

Information on LEADER 3100 A of 3100 D brothers was on the net.

The 3100D and 3100A are slightly different in appearance and color of the label, the others are exactly the same.

As a result of actually using 3100D, I felt that the specifications were similar.

Therefore, I posted the specification of 3100A almost as it was.

Mode Part Item Specification

Real

Vertical

Channel mode

CH1

CH2

ADD

ALT

CHOP

frequency band DC～100MHz -3dB

DC～20MHz -3dB (When bandwidth is limited)

Signal delay 20ns

Input sensitivity 0.5mV～5V/div

Input impedance 1MΩ, 27±3pF

Input coupling

AC

GND

DC

Maximum input voltage 400Vp

Level

Sweep mode

Triggered sweep

Automatic triggered sweep

Single sweep

Continuous delayed sweep

Alternate sweep

A sweep time 50 ns to 0.5 s / div (1 - 2 - 5 steps)

B sweep time 50 ns to 0.5 ms / div (1 - 2 - 5 steps)

Magnification 10 times (×10 MAG)

Trigger Trigger mode

ALT

CH1

CH2

LINE

EXT

12


Trigger coupling

AC

HF-REJ

DC

TV-FLD1

TV-FLD2

TV-LINE

XY mode X：CH1

Y：CH2

DSO

Vertical

Vertical decomposition energy 8 bit (256 point), 25 point/div

sensitivity 0.5 mV to 5 V / div (1 - 2 - 5 steps)

Large sampling 40MS/s (Single Channel)

20MS/s (Dual Channel)

Level

Horizontal decomposition energy 11 bit (2048 point), 200 point/div

Sweep mode

Trigered sweep

Automatic triggered sweep

Single sweep

Continuously delayed sweep

Trigger delayed sweep

Roll mode

Roll trigger mode

A sweep time 50 ns to 50 s / div (1 - 2 - 5 steps)

B sweep time 50 ns to 0.5 ms / div (1 - 2 - 5 steps)

Magnification 1 to 100 times (1-2-5 steps)

Memory capacity Display, Reference memory

8bits × 2k word × 2ch

General

Lead-out function

Measurement unit display (dB, ΔV, ΔT, ΔV%, ΔT%, 1 /

ΔT)

Cursor measurement (voltage, time)

GO/No-GO function Waveform determination

Automatic measurement range switching

function Sensitivity & Cycle

GP-IB HPGL support

Power supply AC90～250V, 48～440Hz, 60W

size 310(W)×150(H)×400(D)mm

weight 7.4kg

Other Release date 1991

List price 480,000円

LEADER 3100D

Documents

Transcript of LEADER 3100D