MS1220 1.2GHz Signal Digitizer

Three types of operations to support all applications digital oscilloscope / analog oscilloscope / built-in type digitizer

The MS1220 adopts a sequential sampling system. Sampling frequency is known to determine the conversion time. This device has a sampling frequency of 1MHz that is about 13 times faster than that of conventional models. Since the conversion takes place within a very short time, a high-speed response is obtained. This is especially advantageous when the device is employed as a digitizer built in a user system. Moreover, its extremely wide measuring frequency band of 1.2GHz makes the device a valuable tool in evaluating and analyzing high-frequency analog circuits and ultra high-speed digital circuits.

The MS1220 comes equipped with three types of interfaces, so that it can adequately respond to all kinds of intended applications. The interface connectors are arranged on the back panel, as illustrated below :

When you load the diskette (DOS software), supplied with the device, into your personal computer, the screen [1.2GHz Digital Oscilloscope] appears automatically.

<Setup>
Use the [COMPUTER I / F] connector. Set the mode (described further below) to [DIGITAL]. You may use either a notebook-type or a desktop-type personal computer. Especially, if you select a notebook-type personal computer, all you have to do to use the device is to plug in the interface cable (MIC100) which is supplied as an accessory. It is very easy to handle the device, and it requires very little space.

<Operation and Settings>
To operate the device and make the necessary setting, use the function keys of the associated personal computer.

(1) Cursor Measurement
You will find this measurement method very handy when you need to read times or voltages from waveforms displayed on the screen. The cursor moves step by step when you operate a function key. However, the Shift key lets you move it 10 steps at a time, and the Ctrl key, 100 steps at a time.

The device measures the time between the O-cursor and the M-cursor. The number takes a positive or negative sign depending on whether the M-cursor is located to the right or the left of the O-cursor, respectively. Even when the M-cursor goes off the screen as you enlarge the waveform image, measurement is performed correctly.

Voltage measurement ( △V )

The device measures the differential voltage between the intersection of the O-cursor with the waveform and the intersection of the M-cursor with the waveform. The number takes a positive or negative sign depending on whether the M-cursor intersection is situated above or below the O-cursor intersection, respectively.

(2) Averaging Process
The device performs simple averaging. This function proves quite effective in extracting signals buried in noise. You can define the number of averaging times at 2n(n=0 to 8, selected by 9 steps).

(3) Enlargement of Waveform
The time base can be expanded with the O-cursor in center. Six different magnifications are available : × 1, × 2, × 4, × 8, × 16, and × 32. This feature comes in handy when you need to observe a small part closely.

(4) Loading / Saving of Waveforms
A maximum of four waveforms can be saved. You will find this function convenient when you have to compare the waveform currently displayed with those stored inside.

(5) Printer Output
You can easily obtain a hard copy of the current screen by printing it out as is.

TYPE2 : 1.2GHz Analog Oscilloscope
When simply coupled to an ordinary oscilloscope (enough with a 20MHz band), the MS1220 functions as an [1.2GHz analog oscilloscope] allowing high-speed waveforms to be observed.

<Setup>
Connect [CH1 SIG OUT], [CH2 SIG OUT], and [H-SYNC] to [CH1 INPUT], [CH2 INPUT], and [EXT TRIG INPUT] of the associated oscilloscope using coaxial cables. Set the mode (described further below) to [ANALOG]. Also, set the input sensitivity of the oscilloscope to 0.1V / div, and the sweep time to 0.5ms / div.

<Operations and Settings>
You operate the MS1220 and make the necessary settings via switches that are located on the front panel of this device. Numbers of VOLTS / FULL and TIME / FULL reduced to 1 / 10 are displayed in VOLTS / DIV and TIME / DIV on the tube screen of the oscilloscope. For example, if you have VOLTS / FULL : 50mV / Full and TIME / FULL : 50ns / Full, the oscilloscope tube screen will indicate 5mV / div and 5ns / div, respectively.

A / D-converted digital data are output as is at a high speed (max. 1µs / data). A real-time [high-speed signal processing system] can be built up by feeding these data into a user system, and then digitally processing the data. Because remote operations and settings are possible on this type of device, total control can be exerted on the device from the host side of the user system.
<Setup>
Use the [DIGITAL I / O] connectors. Set the mode (described further below) to [DIGITAL]. The device delivers the output data [CH1 (CH2) DATA0 to 7], as well as [H-SYNC] and [DATA CLK], which are synchronized to the former, through said connectors. The external system reels in the data according to [H-SYNC] and [DATA CLK]. [DATA CLK] is a maximum of 1MHz.

<Operations and settings>
While the device can be operated and the necessary settings made through the front panel of this device, the same operations and settings can also be performed remotely from the outside, through the [DIGITAL I / O] connectors. If you assign an address and set data corresponding to a set item, then apply a negative [LATCH] pulse, the setting will take effect at its. For this reason, you need to have the [REMOTE] terminal set in advance to Low level (remote status) . The [START], [LATCH], and [REMOTE] terminals are pulled up with 10kohm.

<Operating Sequence>
Upon receiving a [START] pulse, the device begins to capture waveforms, and delivers A / D-converted data, one by one, in correspondence to the sampling frequency. After the device completes the output, it waits for the next [START] pulse to arrive. If another [START] pulse arrives within a waveform capturing period, the device will restart.

While the one-sweep time (in low-speed sweep) remains constant at 5.12ms, the number of output dots changes with sampling period △T

While the number of output dots remains constant at 1,024 dots, the one-sweep time changes with the sampling period.

Interface cable (for notebook PC).
Interface cable (for the ISA buses of a desktop PC).
Interface cable (for the PCI buses of a desktop PC).

In addition, the card / boards inserted in a host computer are as follows, and they should be prepared by a user.

For notebook PC. DAQ Card-DIO-24

For the ISA buses of desktop PC. PC-DIO-24PnP and NI-DAQ

For the PCI buses of desktop PC. PCI-DIO-96 and NI-DAQ
(ALL are the products provided from National Instruments Corporation.)

Specifications　

When functioning as digital oscilloscope :

Functions

Cursor measurements

Time measurement(

T) and voltage measurement (

T1,

T2)

*Cursor moving steps : 1, 10, or 100 steps

Averaging process

Simple averaging

Number of averaging times 2ⁿ (n= 0 to 8)

Waveform enlargement

×1, ×2, ×4, ×8, ×16, and ×32

Waveform loading/saving

4 waveforms (REF1 to REF4)

Printer output

Output the screen display directly on a printer.

Sweep

Sweep mode

Continuous or single

Interfaces

Communication method

Port access method

I/O addresses

8bits × 5ports occupied

Signal level

TTL level

Connectors

50-pin, half-pitch connector

When functioning as a built-in digitizer :

Input / output signals

Output data

8bits × 2channels

Number of data

1,024 dots / sweep

Output synchronizing signal

H-SYNC and DATA CLK

Input control signal

START, LATCH, and REMOTE

*All three signal in negative logic (LATCH at the rise of negative pulse),

pulled up to +5V with 10kohm.

Negative pulse width of START and LATCH : 1µs or more.

Input set value

Set data and addresses

Set item	Address	Set data	Number of bits
CH1 VOLTS / FULL	0	50mV (0), 0.1V (1), 0.2V (2), 0.5V (3), 1V (4)	3bits
CH1 OFFSET	1	Negative full scale (0) to positive full scale (225)	8
CH2 VOLTS / FULL	2	Same as CH1	3
CH2 OFFSET	3	Same as CH1	8
TIME / FULL	4	10ns (0), 20ns (1), 50ns (2), 0.1µs (3), 0.2µs (4), 0.5µs (5), 1µs (6), 2µs (7)	3
DELAY	5	Minimum (0) to maximum (225)	8
TRIG LEVEL	6	Negative full scale (0) to positive full scale (225)	8
TRIG SLOPE	7	Negative (0), positive (1)	1

Signal level

TTL level

Connector

37-pin D-sub connector

Operation

Sequence

Single operation

*performs one sweep upon receiving a START pulse from the outside.

When functioning as an analog oscilloscope :

CH1, CH2 SIG OUT

Output voltage

1V / Full (± 0.5V)

Output resistance

Approx. 220ohm

Sweep time

5.12ms / sweep

H-SYNC

Output voltage

TTL level

Logic

High level during sweep

Common Specifications :

Vertical system

Number of input channels

2channel, CH1 and CH2, operating simultaneously

Input resistance

50ohm

Input sensitivity

50mV to 1V / Full, 1-2-5steps, switched in 5steps

Accuracy

± 3% of Full Scale

Offset range

± 0.5V

Dynamic range

1Vp-p (± 0.5V)

Frequency bandwidth

DC to 1.2GHz (-3dB)

Rise time

292ps or less

Square-wave characteristic

Waveform distortion smaller than 7%

VSWR

Less than 2.0

Channel isolation

40dB or less

Phase difference

100ps or less

Input damage level

±3.5V (DC + AC peak) max

Horizontal system

High-speed sweep time

10ns to 2µs / Full, 1-2-5 steps, switched by 8 steps

Accuracy

± 3% of Full Scale

Mode

ANALOG / DIGITAL

Low-speed sweep time

ANALOG mode : 5.12ms (of which 5ms corresponds to TIME / FULL).

DIGITAL mode : 1,024•

T (of which 1,000dots correspond to TIME / FULL).

Minimum delay time

60ns or less 10ns / Full

Sweep delay time

Approx. (High-speed sweep time) × 1

Number of output dots

ANALOG mode : 5.12 (ms) /

T dots

DIGITAL mode : 1,024dots

Trigger system

Signal source

External

Trigger system

NORM

Trigger resistance

50ohm

Input coupling

Polarity

Rise, fall

Frequency range

5kHz to 200MHz

Sensitivity

200mV or more (10kHz to 100MHz)

Trigger level range

± 1.5V

Sampling frequency

Max. 1MHz

Input damage level

7Vp-p (AC) ± 20V (DC)

A / D conversion part

A / D converter

8bits × 2channels

Sampling speed

Equal to the sampling frequency

General

Operating temperature

0 to 40°C (Guaranteed at 23 ± 10°C)

Operating humidity

Less than 40°C / 90%RH (Guaranteed at less than 33°C / 80%RH)

Storage temperature

-10°C to 60°C, less than 60°C / 80%RH

Power supply

90 to 127V AC

Power consumption

Approx. 20VA

Dimensions

320 (W) × 56 (H) × 350 (D) mm

Weight

Approx. 2.5kg

Accessories :

MIC 100 interface cable (for notebook-type personal computer) (1pc)

DSO software (1pc)

Instruction manual (1pc)

Power cord (1pc)

Fuse (1pc)

Options :

MIC 101 interface cable (for desktop-type personal computer)

MIB 100 interface board (for desktop-type personal computer)

BNC coaxial cable (1m)