The LP-1 logic probe can be used to perform in-circuit testing of TTL, CMOS, and many other logic devices at a maximum of 50 MHz. The LP-1 is enhanced with a logic probe function with a minimum detectable pulse width of 10 ns, providing enough sensitivity for most applications.

How to use:

• Connect the red clip to the + terminal and the black clip to the - terminal of the power source of the circuit under test.
• For TTL and DTL, set the upper select switch to the side marked "TIL.”
• For CMOS, set the upper select switch to the side marked "CMOS" and contact the probe pin at the point to be tested. The LEDs will indicate its logic states: A) ALL LEDs OFF; high impedance B) RED LED ON – High State (1); C) Green LED ON – Low State (0); D) Orange LED ON – Pulse.
• For detecting and storing pulses or level transitions, set the lower select switch to the side marked “PULSE” first. Contact the probe pin at the point to be tested. The LEDs will indicate the basic state. Then set the lower select switch to side marked “MEM”, The orange LED will light when any pulse or level transition is detected. The pulse direction, in comparison with the original basic state, was determined. After use, reset logic probe by setting the lower select switch back to side marked "PULSE.”

Features:

• Handy, Quick and Easy
• For: DTL, TTL and CMOS
• High Frequency Response
• Instant Indication
• Pulse Memory Function

Specification:

• For TTL/CMOS/DTL
• 4 states: detectable, LO, push, and hi-Impedance
• Maximum input frequency: 20 MHz
• Pulse Memory Function
• Reverse Power Polarity Protection
• Supply: 3-18 VDC

Guide: Operational video