My new tool, the LogicPort logic analyser from http://www.pctestinstruments.com/index.htm, arrived last week. It was bad timing as I’m in the middle of our house move, however, as I’ve been itching to try it out last night I made time to play with it. The result is, man I wish I had one of these beasts earlier.
Digging out my Strobit prototype and hooking it up to the SPI bus I was keen to see how it all works (there are a lot of boxes yet to unpack…sob…did I mention that I hate moving house!).
In short I’m impressed with the easy of use of the software and the ability to decode SPI signals on the fly along with I2C, CAN, RS232.
I had the logic analyser reading the SPI signals to and from the RFM12B and all the other signals coming from the RFM12B module. This bit of kit would have helped tremendously in troubleshooting the PIC and SPI issues I was having at the time
Intronix LA1034 LogicPort Specifications and Characteristics
Sampled channels: 34
Timing mode sample rate: 1KHz to 500MHz (uses internal clock)
State mode sample rate: 0 to 200MHz (clock provided by circuit under test)
Sample buffer: 34 x 2048 samples
Maximum sample compression: 2^33 to 1 (sample rates to 200MHz)
Trigger sequencer: 250MHz max, 4ns minimum pulse width
Trigger event counters: 20 bits, range 1 to 1,048,576 for each trigger level
Input impedance: 200K Ohms, paralleled by <5pF
Frequency counter range: 300MHz with 10Hz resolution, 4 channels
Threshold range: adjustable +6 to -6 volts with 50mv resolution
Threshold accuracy: +/-(100mV + 5% of setting)
Channel to channel skew: 0.6ns typical, 1.0ns max
State mode Setup/Hold times: 2.0/0ns, window adjustable +/-2.5ns
Input sensitivity: 0.25Vpp @50MHz, 0.5Vpp @150MHz, 0.8Vpp @250MHz
Input dynamic range: 10 volts peak-peak
Maximum input: +/-40 volts DC, 15 volts peak-peak pulse amplitude
Timebase accuracy: +/-0.005% over full temperature range
Input Probe: Teflon insulated leads terminated with female contacts compatible with 0.025″-0.030″ round or square pins.
Power supply current: 200 milliamps max (supplied by USB)Temperature range: operating +5 to +50C, storage -10 to +65CMinimum system requirements:
Pentium II or better (400MHz or faster recommended) 32MB available memory
20MB available disk space
800 x 600 (1024 x 768 recommended) standard DPI display USB 1.1 or 2.0 port
The LA1034 is compatible with the following operating systems:
Windows XP (32 and 64 bit versions) Windows Vista (32 and 64 bit versions) Windows 7 (32 and 64 bit versions)
Once I’m unpacked, I’m really looking forward to getting back into the project.