LOGIC PROBE

LP-2800

COMMON SPECIFICATIONS:
Input impedance : 1M[.
width of min. pulse : 30 ns.
max. input frequency : 17MHz.
measurable Logic Gate : TTL and CMOS
Logic 1 (red LED Lights)and then buzz. 2.3V0.2V 70% Vcc
Logic 0 (green LED lights)and then buzz. 0.8V 0.2V 30% Vcc.
input overvoltage protection : 220V DC/AC 15 sec.
Pulse (yellow LED) flashing time : 500ms.
Power supply protection : 20V.
Special functions for LP-3500
ABS CASE
Two audio tones.
Two external terminal.
          It is also available for LP-2800 but at extra-pay

LOGIC PULSER
  The K&H LP-540H logic pulser is a very effective tool for inspecting and repairing the logic circuits. It can be used direcetly to inject a signal into the logic circuits without removing the IC or reading the circuits. Using the logic probe as a monitor, you can not only know the wiring errors but also check out components malfunctional. The reason is that it can produce a very large transient current in a moment. Since the average power to be produced under these conditoins is very small, the injected signal will not destroy any one of the componetns in the circuits. Further, the pulser takes advantage of the voltage produced by a current flowing through the inherent resistance of the circuit to produce the injected signal.

Logic Pulser can produce a 10 s pulse signal at 100mA load.
The signal frequency may be switched to either 0.5Hz or 400Hz,
and as a result the Logic Pulser is a fairly powerful pulser. At the
same time, the Logic Pulser can produce a 90% high digital signal
at square wave output terminal, and it is easier to observe and
trace circuits by using oscilloscope. The logic Pulser Probe also
has a sync input point, which can be used to produce an externally
synchronized signal.

SPECIFICATION
Frequency : 5Hz ~ 40MHz
Duty cycle : 0.01% ~ 49.9%
Pulse width : 9nS ~ 999S
Input signal : TTL or CMOS level (5V system)
Input impedance : 400k
Sample cycle : 400mS
Display rate : 2.5 reading/second
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LP-420D P DIGITAL LOGIC PROBE
SPECIAL FUNCTION FOR LP-420D
Logic probe
Frequency meter
Duty cycle meter
Pulse width meter
Auto range, auto display