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probe9
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probe9.txt
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1996-06-11
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PROBE9.ZIP contains
Lprobe9.exe
Fprobe9.exe
Setprobe.exe
Probe9.bmp
Probe9.jpg
Probe9.txt
Probe9 is a stable frequency counter accurate to 5 significant digits.
Range = 0 - 30MHz.
Input sensitivity >100 mV
Probe 9 connects to the PC serial port.
By using the crystal oscilator already present on your PC serial card,
and software calibration, the Probes' external circuitry is kept to a minimum.
Probe 9 can also be used as a logic probe/analyzer using 'LPROBE9.EXE'.
SETPROBE.EXE: This is the frequency counter calibration program.
To give accurate readings the Probe must be calibrated
to your PC. SETPROBE.EXE calculates the constant error correction factor
for the particular PC serial card the probe is to be used on.
The frequency counter corrects for this slight constant error in crystal
frequency by using the correction factor contained in PROBE.DAT.
To calculate this correction factor, a reliable oscillator of known frequency
( eg 2MHz Crystal Oscillator) is required.
When CALIBRAT.EXE is run, the Probe will sample the frequency and then ask
for the true frequency value in HZ. {* The frequency entered must be to 1 Hz
accuracy (no decimal points) or an error will occurr.*}
eg ( '200123' not '200123.34' or '2003.421 kHz' )
The program then calculates constant error correction factor and stores
it to PROBE.DAT .
Calibration is only nescessary once.
LPROBE9.EXE: Logic analysis program . Logic states are dispalyed in real time,
,runs best under dos (not dos window).
The sampling speed is adjusted by using the <-- --> left, right arrow keys.
The three triggering modes are;
TRIG: Starts each scan (left-right of screen) on a negative going edge of
logic signal.
KEY TRIG: Waits for a key to be pressed before beginning each scan.
FREE RUNNING: Not triggered.
To Toggle between these Use the UP / DOWN arrow keys.
* To quit from LPROBE press [ ESC ] .
FPROBE9.EXE: This is the frequency counter program . The measured frequency is
displayed in Hz with commas indicating KHz and MHz.
* To quit from FPROBE press any key.
CIRCUIT DIAGRAMS:
{Probe9.bmp or Probe9.jpg}
Complete circuit diagram for Probe9.
* The numbers surrounding the IC blocks indicate pin numbers,
the supply (+5V and 0V ) connections are not shown on the diagram.
Probe9.zip is Free-Ware.
freely distributed in its' unaltered form.
The Author accepts no responsibility for any undisirable incidents
resulting from the use/abuse of this circuit and/or software.
More information ,corrections, comments :
Email : Genius2@ozemail.com.au