oscilloscope

I'm a newbie wanting to muck about with picaxe projects partly to
learn and partly to make some long-wished-for gadgets, eg datalogging
battery charging and meteorological/power generation info, and a
keyless front door lock.

I'm confused about the pros and cons of these two CRO alterrnatives.
The first seems to be a cheap analogue machine.
Costs new about $US 350

The second, a USB computer-based "black box" that doesn't seem to want
to tell me what the bandwidth is. Maybe it's in there somewhere, but I
don't know enough to tell. This is around $US 250

I'd appreciate any advice regarding the usefulness of these in general
electronics, picaxe, and education for me.
Cheers, jack

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20Mhz Dual Channel Cathode Ray Oscilloscope

SPECIFICATIONS

Vertical Deflection
Sens.: 5mV - 5V/div (10 steps 1-2-5 seq.)
Bandwidth: DC to 20MHz
Rise time: 17.5ns
Input impedance: 1MO with 25pF shunt
Max input voltage: 300V (DC and AC p-p)
Input coupling: AC, GND, DC
Modes: CH1, CH2, ADD, DUAL
CH1 output: Min 20mV DC
Horizontal Deflection
Sensitivity: 0.5sec/div, (20 steps 1-2-5 seq.)
Accuracy: ±3%
Trigger
Modes: Auto, Norm, TV-V, TV-H
Source: CH1, CH2, LINE, EXT
Slope: Positive or negative
Ext. input impedance: 1M with 25pF shunt
Probe Adjustment
Frequency: 1kHz (20%)
Level: 2V (±2%) p-p
Duty ratio: <48:52

X-Y
X Axis bandwidth: DC to 500kHz
X-Y Phase diff.: 3° or less (DC to 50kHz)

Z Axis
Input impedance: 47kO
Input signal: +5V (positive INPUT)
Max. i/p voltage: 30V
Bandwidth: DC-2MHz
Power
Power supply: 220VAC
General
Dimensions: 310(W) x 150(D) x 455(H) mm
Weight: ?8kg

CRT
6° tube: Rectangular face (8 x 10div)


Features

? 2 channels
? Variable sweep
? 10x magnification
? 4 trigger modes, auto, norm, TV-V & TV-H
? Wide bandwidth and high sensitivity
? Easy to read 6? display
? Bail-arm stand for ease of viewing
? Carry handle
? Very low power consumption
? High sensitivity X-Y mode
? Z axis (intensity modulation)
? TV video sync
? Filter
? High frequency rejection filter in the triggering circuit
? Supplied with 2 high quality test probes

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2 Channel USB Oscilloscope


At last! A genuinely affordable computer connect oscilloscope. USB
connect oscilloscopes out of Europe and North America have so far been
out of the price range for hobbyists, schools, and even many
professional people. Fortunately, we have been able to work with a
EUROPEAN manufacturer to produce this compact unit which is packed
with features and the European quality we've come to know.



Using the Plug 'n Play USB technology and providing full optical
isolation from the computer, this oscilloscope is easy to setup and
use, as well as providing protection for the computer. The software
(again developed in Europe) is a fully featured chart recorder,
function generator, logic generator, logic analyser, and spectrum
analyser all in one easy to use package.



We think you'll be suitably impressed by this product's price and
feature list.



Specifications
Oscilloscope, spectrum analyzer
Sample rate: 100 Hz - 200 kHz
Input voltage -20 - +20 V
ADC capacity: 10 bits
Window functions: Hamming, Hanning, Blackman, Blackman-Harris



Recorder:
Sample rate: 0.01 Hz - 200 KHz
Maximum record time: 24 hours
Input voltage -20 - +20 V
ADC capacity: 10 bit



Logic analyzer:
Number of channels 16 (8 if logical generator is on)
Sample rate 1 KHz - 8 MHz
Input voltage: 0 - 5V



Logical generator:
Number of channels: 8
Sample rate: 1 KHz - 1 MHz
Memory depth: 1544 bit/channel
Output voltage: "0" - 0 V, "1" - 3.3 V
Maximum input/output current: 10 mA



Minimum system requirements:
Windows 2000 or XP
Pentium 600MHz, 256MB RAM.
.

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