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So với cái probe của tui làm thì cái VOM chỉ là đồ chơi , 
Không mất nhiều tiền mà còn ....gọn hơn cái VOM rất nhiều 17 chức năng đo
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Prob - Logic Probe
The logic probe shows 'H' for high (over 3.7 volts), 'L' for low (below 0.8 volts) and '-' for floating in the first display location. If a pulse is detected (0.5 usec minimum), the second location flashes a 'P'.
PULS - logic pulser
The logic pulser shows the pulse rate (5, 50, 500, 5.0) in the last 3 locations. The first location shows the sensed logic level as a dash in the bottom or top of the digit. When button #1 is held down, a series of 0.5 microsecond pulses are generated in the opposite direction and the center segment is lit. Pushing button #2 cycles thru the 4 pulse rates. The selected pulse rate is saved on power down.
FrEq - Frequency Counter
In the frequency counter mode, hitting button #1 switches the display to the next 4 digits of the count. For instance, the display shows '12.57' for a frequency of 12,576 hz. Holding down button #1 shows '2576' - the lowest 4 digits. If a decimal point shows, the value is in Khz, if the decimal is flashing, the value is in Mhz. Hence, a frequency of 42,345,678 hz is displayed as 42.34 with a flashing decimal. Holding down button #1 in this case will display 5678.
Cnt - Event Counter
In the event count mode, the display shows the lowest 4 digits. Button #1 switches to the next higher 4 digits while held down. Button #2 resets the count.
VoLt - Voltmeter
The voltmeter uses the power going into the probe as a voltage reference. The current implementation shows only an approximate voltage - about 2% high. This can still be very usefull for most measurements. Do not connect the probe to voltages that exceed 5 volts under any conditions.
diod - Diode Junction Voltage
This is just the voltmeter function with 10k resitor feeding current to the probe tip. When a diode or transistor junction is connected from the tip to the ground lead, the drop voltage is displayed.
Cap - Capacitance Measurement
When a capacitor is connected from the tip to the ground lead, and button #1 is pushed, its value is displayed. Values from .001 uf to about 500 uf are displayed. The larger the capacitor, the longer it takes to measure. A value of 100uf takes a couple of seconds.
Coil - Inductance Measurement
When an inductorr is connected from the tip to the ground lead, and button #1 is pushed, its value is displayed. Values from 0.1 to 999.9 millihenries are displayed. Note: this function assumes that the DC resistance is not more than a few ohms. Also, if the unit gets 'stuck' in this mode, jumper the tip to ground to free it.
SIG - Signal Generator
This mode generates a 500hz squarewave at about 0.5 volts. The signal is only generated while button #1 is held down.
ntSC - Video Patern
Generates an NTSC video frame with a white dot pattern when button #1 is held down.
9600 - Serial Ascii
Each time button 1 is pushed, the letters A-Z followed by cr/lf is generated. Auto polarity sensing. If the signal injection point is orignally high, then normal (zero start bit) ascii is generated. Otherwise, the other polarity is done. New feature: Button #2 cycles thru 1200, 2400, 4800, 9600 baud.
Midi - Midi Note
Sends note number 60 (middle C) on any of the 16 midi channels. Holding button 1 sends 'note on'. Release of button 1 sends 'note off'. Buttton 2 cycles thru the 16 channels. The midi channel number is stored.
R/C Servo
Generates 1ms to 2ms pulse for r/c servos. Button 1 increases pulse, Button 2 decreases pulse. Defaults to 1.5 ms each time mode is entered.
[ ] Sqaure Wave
Generates 1 - 9999 hz squarewave. Button 1 decreases frequency, Button 2 increases frequency.
Prn - Pseudo Random Number
Generates 10khz digital PRN series.
ir38
Generates 1 millisecond on and 2.5 millisecond off of 38khz square wave. When connected to IR LED, used for testing IR reciever modules.
PWM
Generates variable pulse width 3-97 percent of a 6khz (approx) digital signal. Button 1 decreases pulse width, Button 2 increases pulse width.
In any mode, holding down both buttons exits to the menu. Once there, releasing and pressing button #1 cycles thru its modes forward. New Feature: Button #2 cycles thru
Không mất nhiều tiền mà còn ....gọn hơn cái VOM rất nhiều 17 chức năng đo
-
Prob - Logic Probe
The logic probe shows 'H' for high (over 3.7 volts), 'L' for low (below 0.8 volts) and '-' for floating in the first display location. If a pulse is detected (0.5 usec minimum), the second location flashes a 'P'.
PULS - logic pulser
The logic pulser shows the pulse rate (5, 50, 500, 5.0) in the last 3 locations. The first location shows the sensed logic level as a dash in the bottom or top of the digit. When button #1 is held down, a series of 0.5 microsecond pulses are generated in the opposite direction and the center segment is lit. Pushing button #2 cycles thru the 4 pulse rates. The selected pulse rate is saved on power down.
FrEq - Frequency Counter
In the frequency counter mode, hitting button #1 switches the display to the next 4 digits of the count. For instance, the display shows '12.57' for a frequency of 12,576 hz. Holding down button #1 shows '2576' - the lowest 4 digits. If a decimal point shows, the value is in Khz, if the decimal is flashing, the value is in Mhz. Hence, a frequency of 42,345,678 hz is displayed as 42.34 with a flashing decimal. Holding down button #1 in this case will display 5678.
Cnt - Event Counter
In the event count mode, the display shows the lowest 4 digits. Button #1 switches to the next higher 4 digits while held down. Button #2 resets the count.
VoLt - Voltmeter
The voltmeter uses the power going into the probe as a voltage reference. The current implementation shows only an approximate voltage - about 2% high. This can still be very usefull for most measurements. Do not connect the probe to voltages that exceed 5 volts under any conditions.
diod - Diode Junction Voltage
This is just the voltmeter function with 10k resitor feeding current to the probe tip. When a diode or transistor junction is connected from the tip to the ground lead, the drop voltage is displayed.
Cap - Capacitance Measurement
When a capacitor is connected from the tip to the ground lead, and button #1 is pushed, its value is displayed. Values from .001 uf to about 500 uf are displayed. The larger the capacitor, the longer it takes to measure. A value of 100uf takes a couple of seconds.
Coil - Inductance Measurement
When an inductorr is connected from the tip to the ground lead, and button #1 is pushed, its value is displayed. Values from 0.1 to 999.9 millihenries are displayed. Note: this function assumes that the DC resistance is not more than a few ohms. Also, if the unit gets 'stuck' in this mode, jumper the tip to ground to free it.
SIG - Signal Generator
This mode generates a 500hz squarewave at about 0.5 volts. The signal is only generated while button #1 is held down.
ntSC - Video Patern
Generates an NTSC video frame with a white dot pattern when button #1 is held down.
9600 - Serial Ascii
Each time button 1 is pushed, the letters A-Z followed by cr/lf is generated. Auto polarity sensing. If the signal injection point is orignally high, then normal (zero start bit) ascii is generated. Otherwise, the other polarity is done. New feature: Button #2 cycles thru 1200, 2400, 4800, 9600 baud.
Midi - Midi Note
Sends note number 60 (middle C) on any of the 16 midi channels. Holding button 1 sends 'note on'. Release of button 1 sends 'note off'. Buttton 2 cycles thru the 16 channels. The midi channel number is stored.
R/C Servo
Generates 1ms to 2ms pulse for r/c servos. Button 1 increases pulse, Button 2 decreases pulse. Defaults to 1.5 ms each time mode is entered.
[ ] Sqaure Wave
Generates 1 - 9999 hz squarewave. Button 1 decreases frequency, Button 2 increases frequency.
Prn - Pseudo Random Number
Generates 10khz digital PRN series.
ir38
Generates 1 millisecond on and 2.5 millisecond off of 38khz square wave. When connected to IR LED, used for testing IR reciever modules.
PWM
Generates variable pulse width 3-97 percent of a 6khz (approx) digital signal. Button 1 decreases pulse width, Button 2 increases pulse width.
In any mode, holding down both buttons exits to the menu. Once there, releasing and pressing button #1 cycles thru its modes forward. New Feature: Button #2 cycles thru
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