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The PR-21 is a versatile instrument for troubleshooting and analyzing logic circuits. Features include visual indication of pulse level and pulse presence, pulse memory, plus an audible, two-tone, logic state indicator. The probe responds to pulses as narrow as 30ns and pulse trains up to 20MHz, and is compatible with TTL, DTL, RTL, HTL, CMOS and MOS. It is also compact and light weight. Three color-coded LEDs indicate pulse presence and high/low logic states. Visual indication is complemented by audible tones of two distinctly different frequencies to distinguish the logic states easily. The PR-21 Logic Probe is a valuable servicing aid, especially when used in conjunction with the PR-31 Logic Pulsar.

Input Signal Frequency: 20MHz Max Minimum Detectable Pulse Width: 30ns Input Impedance: 1MΩ Operating Supply Range (Vcc): 4V DC Min., 18V DC Max., TTL Logic “1” (Hi LED) >2.3 ±0.2V DC, Logic “0” (Lo LED) <0.8 ±0.2V DC, CMOS Logic “1” (Hi LED) >70% Vcc ±10%, Logic “0” (Lo LED) <30% Vcc ±10% Maximum Allowable Supply Voltage (Vcc): ± 20V DC Power Supply Protection: ±20V DC Max. (15 sec.) Signal Input Protection: ±220V AC/DC Max. (15 sec.) Pulse Indicator Flash Time: 500ms Operating Environment: 0°C to 50°C, <80% relative humidity Storage Environment: -20°C to 65°C, <75% relative humidity Dimensions, Weight: 8.2” long x 0.7” dia. (21cm x 1.8cm) net weight 1.6 oz. (45g)

The PR-31 Pulse Generator is used to inject a signal into a logic circuit without having to remove the IC or open the circuit. Using the companion PR-21 Logic Probe you can detect component failures or wiring errors. The average power of the injected signal is limited by supply voltage (Vcc) of the circuit under test, and with its short duration pulses, will not damage circuit components. The PR-31 Logic Pulsar produces a 10µs signal at a 100 mA load and can be switched to either 0.5Hz or 400Hz. It is also capable of generating a square wave equal to approximately 90% of the supply voltage (Vcc) at the square wave output terminal so that an oscilloscope can be used to observe and trace signals. The PR-31 Logic Pulsar also has an external sync input, which enables the user to synchronize the pulse output with an external signal, such as a computer clock circuit.

Input Signal Frequency: 20MHz Max Minimum Detectable Pulse Width: 30ns Input Impedance: 1MΩ Operating Supply Range (Vcc): 4V DC Min., 18V DC Max., TTL Logic “1” (Hi LED) >2.3 ±0.2V DC, Logic “0” (Lo LED) <0.8 ±0.2V DC, CMOS Logic “1” (Hi LED) >70% Vcc ±10%, Logic “0” (Lo LED) <30% Vcc ±10% Maximum Allowable Supply Voltage (Vcc): ± 20V DC Power Supply Protection: ±20V DC Max. (15 sec.) Signal Input Protection: ±220V AC/DC Max. (15 sec.) Pulse Indicator Flash Time: 500ms Operating Environment: 0°C to 50°C, <80% relative humidity Storage Environment: -20°C to 65°C, <75% relative humidity Dimensions, Weight: 8.2” long x 0.7” dia. (21cm x 1.8cm) net weight 1.6 oz. (45g) Output Pulse Rate: 0.5/400Hz Output Pulse Width: 10-15µs Output Pulse Amplitude: Approx. 90% Vcc Output Current: 100mA Sink/Source Square Wave Output Current: 5mA Sink/Source Sync Input Impedance: 1MΩ Power Supply Range (Vcc): 5-15V DC Overload Protection: Power Supply 20V DC Max. (30 sec.), Sync Input 120V DC Max. (30 sec.), Test Point 35V DC Max. (30 sec.) Operating Environment: 0°C to 50°C, <80% relative humidity Storage Environment: -20°C to 65°C, <75% relative humidity Dimensions, Weight: 8.2” long x 0.7” dia. (21cm x 1.8cm) net weight 1.4oz. (40g)