Probe for Soviet made oscilloscope

[conel]

Hello.

I bought my first oscilloscope and that`s USSR made analog oscilloscope SAGA. My model looks similar to C1-94, but there is no clear indication what model it is, except its brand.

Problem is, I don't have probe for it, and I couldn't find one.

Maybe someone on the forums knows how to "make" such "probe" yourself, or on which pin connect probing cable?

Photo of probe socket (it was probably called DIN5 socket):


According to my measurements, pins 1 and 5 are connected to each other. Then pin 3 and little metal piece (6) are connected to each other + to ground socket on right side of front panel.

As it's my first oscilloscope and I'm not exactly sure what I'm doing, I didn't try to connect anything to it, because I don't want to blow this thing just yet.

Any help would be really appreciated.

[Paul Price]

turn it on a get a trace and stick a small wire into each of the ungrounded orifices of the input connector, you will find one that will give you a display and maybe an other one that is not so sensitive. The sensitive one is X1 and the other pins supplying power for a FET probe or vacuum tube low-cap probe.

 You can then solder some test leads or banana jacks or even a  BNC connector to connect to just an ordinary scope probe that supports 30pF input capacitance.

You probably need a Putin-Probe, on sale in the Crimea, you can find these in small shops in Cuba, or on USSRbay.

Don't worry, you won't burn it out playing with it, it was made to survive at least three hot or cold wars.

[katzohki]

3 & 6 are Ground... so I would venture to say that 1 & 5 are signal input. Does it have a calibration output? Probably couldn't hurt it to try feeding that in.

Also, to add to Paul's suggestion: Put the scope on the smallest volts/division.

[conel]

I connected Atmega8 generating signal to pin 1, and ground to separate socket, and its working fine.

Thanks guys.

So now I have to "make" some kind of probe and figure out how to rotate lamp a bit to the right (it is of to the left, but still usable).

[balu]

Hi conel,

Check this document

http://www.mikrocontroller.net/attachment/69493/Reparaturanleitung.pdf

[balu]

And check this http://www.amateurengineer.com/?p=623

[katzohki]

Buy a probe. "Make" an adapter. Actually there is such a thing as DIN5 to BNC adapter, but I think you will be better off building your own rather than trying to find such an oddball.

In fact, here's a guy who made an adapter for the C1-94:
http://www.amateurengineer.com/?p=623

[conel]

Thank you. I’ll go with building adapter, and buying a probe.

I guess, that 10 USD China-made probe will be enough for such low-end scope? I don’t need this for any high frequency measures anyway.

[Paul Price]

Many professionals , and especially

but hams good

known oscilloscope C1 -94

(Fig. 1) . The device , with its rather

decent specifications ,

has a very small size and

weight , as well as relatively low

worth. With this model CPA -

Dhu gained popularity among spe -

ists involved in mobile

repair of various electronic tech-

nicknames that do not require a very broad

baseband input signals , and

differences of the two channels for simultaneous

measurements. Currently, the ex-

pluatatsii is sufficiently

large number of oscilloscopes.

In this regard, this article pre-

assigned to specialists who

it became necessary to repair and on-the-

construction oscilloscope C1 -94 . os-

lograf has the usual devices for

block diagram of this class

(Fig. 2) . It contains a vertical channel

deviation in ( CWE) , horizontal channel

tal deviation ( CLC ) , a calibrator

torr , the electron beam with the indicator

high-voltage power supply and

low-voltage power supply .

CEP consists of a switchable

input divider , pre-

amplifier , delay lines and tip -

of the amplifier. It is designed for amplification

tion signal in the frequency range

0 ... 10 MHz to the level required for

produce a given coefficient

vertical deflection (10 mV / div ...

5 V / div in 1-2-5 sequence ) with minimum

amplitude- frequency and phase- frequency

governmental distortions.

CLC includes an amplifier syn-

synchronization , trigger synchronization

the startup , sweep generator , the scheme

mu locking and power sweep.

It is intended to provide any -

linear deflection of the beam with a given co-

coefficient sweep from 0.1 ms / div

to 50 ms / div in 1-2-5 sequence .

Calibrator generates a signal

for calibration amplitude

and time.

Node electron beam indicator

torus consists of an electron beam

tube (CRT ) , CRT and power supply circuits

illumination scheme .

Low-voltage power - designed

chen to supply all functional

device voltages 24 V and q 12 V.

Consider working on the oscilloscope

level concept (Fig. 3) .

Analyzed through the input signal

SH1 connector and push button switch

B1 -1 ( "Open / Closed entrance ") post -

Paet on input switchable Delhi -

tor elements for R3 ... R6, R11, C2, C4 ...

C8. Scheme providing input divider -

a constancy of the input impedance

regardless of the position switches

the Tell vertical sensitivity B1

(.V / DIV . "). capacitors divider

provide frequency compensation

divider in the whole band .

The output of the divider analyzed signal

nal input to preliminary

CWE amplifier ( unit U1 ) . on the field

transistor T1 -U1 collected source-

repeater for AC input

signal. DC this cascade

cad ensures symmetry Desktop

mode for subsequent amplification stages

tributor . Divider resistors R1- U1 ,

R5- U1 provides input resistance

tion amplifier equal to 1M . diode

U1 and D1- D2 zener -U1 - providing

are input overload protection .

two-stage pre-

amplifier made ??with transistors T2

[katzohki]

Yes you can use a cheap probe. There should be some reviews or chat regarding cheap ebay probes somewhere around on this site.
Suggestion: Add a little shielding (aluminum foil or better) to your adapter when you build it.

[DmitryL]

Hello.

I bought my first oscilloscope and that`s USSR made analog oscilloscope SAGA. My model looks similar to C1-94, but there is no clear indication what model it is, except its brand.

Problem is, I don't have probe for it, and I couldn't find one.
Maybe someone on the forums knows how to "make" such "probe" yourself, or on which pin connect probing cable?
Photo of probe socket (it was probably called DIN5 socket):
According to my measurements, pins 1 and 5 are connected to each other. Then pin 3 and little metal piece (6) are connected to each other + to ground socket on right side of front panel.

As it's my first oscilloscope and I'm not exactly sure what I'm doing, I didn't try to connect anything to it, because I don't want to blow this thing just yet.
Any help would be really appreciated.

A long time ago I had a similar scope, but with an ordinary BNC connector.
I would recommend you to open the scope (nothing to be afraid of there) and check if you can fit a normal 50Ohm BNC there. The connector should have just 2 wires, one of them is connected to the scope's ground.

AFAIK this scope has 10Mhz bandwith, so that any lousy probe will do.

[Paul Price]

No, any probe will not do.

If your probe is a 10x probe there needs to be compensation adjustment calibration or the frequency response of the scope(even though it is limited to -3db at 10mHz) will show a incorrect/distorted of waveform/amplitude display of any signal component over a few hundred cycles.