- USB 2.0 and USB 1.1 compatible
- Opto Isolated from computer
- Dual channel with 150 MHz bandwidth
- Deflection factor: 10mV/div to 5V/div in 1-2-5 sequence
- Max real time sampling rate 100 MS/s
- Max equivalent sampling rate 10 GS/s
- Large internal memory: 1Msample each channel
- Software for Windows 98SE, Windows ME, Windows 2000, Windows XP, Windows Vista, and Windows 7.
Part of the ETC Measuring Lab 3 (EML3) series, the M774 is a dual-channel USB digital storage oscilloscope (DSO) compatible with USB 2.0 and USB 1.1 interfaces. The computer connection is isolated up to 500Vp from the measuring circuits of the oscilloscope. Ease of installation and the USB connection to a computer make this DSO extremely portable. The storage scope is powered by the USB bus; its low, maximum power consumption of 2.35W makes this oscilloscope an ideal choice for use with a battery-powered notebook in the field.
The scope inputs are accessible via BNC connectors and are compatible with standard probes (with minimum of 30 pF compensation range). Internal storage (1M samples per channel) is used as a fast data buffer to store a measured waveform.
The PC control software included with the scope provides full control of the DSO. All standard features of modern DSOs (hold acquisition process, hold-off, zoom etc.) and many more (saving/loading the waveforms for future use, export to clipboard, printing the results together with scope settings) are available. The fast USB2.0 data transfer offers extremely rapid display refresh, creating the impression of an analog instrument.
Four standard acquisition modes (AUTO, NORMAL, SINGLE, MANUAL) are available. The trigger event is created by a dual level triggering system equipped with digital pulse length filter and event counter on each level. Channel A, channel B and the external trigger input can be selected as trigger sources. The threshold of the channel A and channel B triggers is settable over the entire range of the scope screen. The threshold of the external trigger is fixed to about 1.5V and is TTL and CMOS compatible. The sophisticated triggering system allows to display waveforms with very complex trigger events (i.e. row of a video signal).
The time base in 1:1 display mode (no zoom) is settable from 5ns/div to 100ms/div in sequence of 1-2-5. It is possible to set the time base from 625ps/div to 204.8s/div using different zoom settings.
The M774 Roll Mode allows you to turn the oscilloscope into a data logger (the amount of acquired data that can be stored only depends on the available free disk space of your computer).
A printed installation guide and a detailed user’s guide on CD are part of the M774 package. Integrated tool tips make the PC software easy to use. Compatible with Windows 98SE, Windows ME, Windows 2000, Windows XP and Windows Vista operating systems. The oscilloscope screen can be resized according to your monitor resolution (minimum 800x600).
Optional Development Software
The M774 Development kit (optional software package) is available, which allows you to write your own application software that interfaces to the storage scope.
M774 Isolated Digital Storage Scope Features
Vertical deflection system
|No. of divisions ||8 |
|No. of pixels per division ||32 |
|Deflection factor range ||10mV/div to 5V/div in 1-2-5 sequence |
|Accuracy ||±2% of current value + 1 pixel |
|Resolution ||8 bits (0.39%) |
|Frequency response (-3dB) ||DC: 0-150 MHz, AC: 1.2 Hz-150 MHz |
|Step response rise time ||max. 2.4 ns |
|Channel isolation ||min. –60 dB |
|Resistance ||1 MΩ +5%, -2% |
|Input resistance inaccuracy adjustment ||Digital for absolute accuracy ±2% of current voltage + 1 pixel |
|Capacitance ||28 pF ±2 pF |
|Zero setting accuracy ||±2% of the screen |
|Maximum input voltage ||±200V at 100 kHz or less |
|System type ||Dual level |
|Trigger source for primary level ||selectable Channel A, Channel B or external trigger input |
|Trigger source for secondary level ||selectable Channel A, Channel B or external trigger input |
|Threshold setting ||Channel A and Channel B on the whole display range. External fixed on about 1.5V |
|Slope selection ||Leading or trailing edge independently on each source |
|Minimum trigger pulse period ||5 ns |
|Minimum trigger pulse length ||2.5 ns |
|Maximum voltage on external trigger input ||–10V to +13V at 20 kHz or less |
|Adjustments ||Digital filter with valid pulse length settable up to 131072*Ts for each level and counter of valid triggering events settable from 1 to 32768 for each level. HOLD-OFF settable up to 1048576*Ts with selectable AUTO mode, to sample proper amount of data before trigger. (Ts – actual real-time sampling period.) |
Data acquisition system
|No. of divisions ||10 |
|No. of pixels per division ||50 |
|Mode of operation ||Sampling before and after trigger with continual selection of the trigger position |
|Record length ||Settable from 1024 to 1048576 (1M) samples for each channel |
|Time base range in 1:1 mode ||5 ns/d to 100 ms/d in 1-2-5 sequence |
|Time base range using different ZOOM modes ||625 ps/d to 204.8 s/d |
|Time base accuracy ||0.01% to 100ns/d, 0.5% for 50ns/d to 5ns/d |
|Real-time sampling frequency ||1 kHz to 100 MHz |
|Equivalent sampling frequency ||1 kHz to 10 GHz |
|Display range with respect to trigger event ||1048576 samples before and 1048576 samples after trig. event in length of 1048576 samples |
Probe compensation generator
|Output connector ||BNC, together with External trigger input |
|Output impedance ||1kΩ to parallel with 10nF and approx. 50Ω serial |
|Output waveform ||Pulse with 1:1 duty cycle |
|Frequency ||1465 Hz |
|Output voltage (no load) ||3.3V ±5% |
|Power source ||USB interface via USB cable (power ground isolated from ground of measuring inputs) |
|Max. current ||470 mA |
|Maximum working voltage ||500Vp while the voltage [V] * frequency [Hz] factor must not exceed 50000 [V Hz] |
|Resistance ||> 2GΩ |
|Capacitance ||Approx. 150pF |
|Dimensions without feet and connectors ||165 × 111 × 35 mm |
|Dimensions with feet and connectors ||182 × 111 × 39 mm |
|Weight ||550 g |
M774 Package Contents
- M774 device
- USB cable
- Safety grounding cable
- Installation guide
- CD with software and user’s guide
Digital Storage Oscilloscope Documentation
Kits containing the M774 You may want to consider the following kits that feature the M774 with probes and carrying case with protective foam inserts.
- K774 — M774/RM with two 200MHz/1:1:10 switchable oscilloscope probes
- KUNI — M774/RM with two 200MHz/1:1:10 switchable oscilloscope probes and one 150MHz/1:100 oscilloscope probe
- KPWR — M774/RM with two 150MHz/1:100 oscilloscope probes and one 200MHz/1:1:10 switchable oscilloscope probe
M774 Isolated Oscilloscope Add-On Option
The Development Kit is an API allowing you to add control functions for the scope in your own software applications. It works in Windows 98SE, Me, 2000, XP and Vista. It comes with descriptions and examples of all libraries written in Inprise Delphi, Borland C++ and Microsoft Visual Basic.
Optional Recommended Products for this Item