Handles tasks ranging from pulse input from rotary equipment to voltage measurement

• This unit is one input channel. In addition to frequency measurement, this single unit handles integration measurement, pulse duty ratio measurement and voltage measurement.
• To measure high voltages, this into comes equipped with a power terminal for the DIFFERNTIAL PROBE 9322. It can alse be connected directly to each channel. Simply slot the 8955 into the Digital Oscillo Series MEMORY HiCORDER 8855 for use.
• Rapid 10 µs F/V input response
• Suitable applications
• Engine or crank rotation, Wheel and transmission gear rotation, Vehicle speed encoder output, Fuel, cooling water flow quantity, Handle angle, Dynamo frequency for generators.

• Measurement functions Number of channels: 1, Measurements: frequency of voltage input, power frequency, revolution speed, integration, pulse duty comparison, pulse width
• Input Metal BNC connector, Max. rated voltage to earth: 30 V rms or 60 V DC (with input isolated from the unit, the maximum voltage that can be applied between input channels and chassis, or across input pins, without causing damage)
• Measurement range Frequency: 0.1 Hz to 5 kHz/division between DC to 100 kHz, 10 settings
• Rotations: 10 (r/min) to 500 (r/min)/division, 4 settings
• Power frequency: 50 Hz (40 to 60 Hz), 60 Hz (50 to 70 Hz)
• Integration: 2 kcounts to 1 Mcounts/division between DC to 90 kHz
• Pulse duty ratio: 100% f.s. between 10 Hz to 100 kHz, 1 setting
• Pulse width: 500 µs to 100 ms/division between 2.5 µs to 2 sec, 6 settings
• Max. allowable input: 30 V rms or 60 V DC (the maximum voltage that can be applied between input pins without causing damage), full-scale = 20 divisions, low-pass filter: 5/500/5 k/100 kHz/OFF
• Measurement resolution Frequency, power frequency, rotations, pulse width, duty ratio: 1/200 of measurement range
• Pulse duty ratio: 1/2000 of measurement range
• Response time 10 µs + 50 ns or less (when frequency is less than 300 Hz, measuring integration or pulse width) 50 µs + 50 ns or less (when frequency is less than 300 Hz, measuring pulse duty ratio, rotation)
• Accuracy Frequency: ±0.1% f.s. (for settings other than 100 kHz f.s.), ±0.7% f.s. (100 kHz f.s. setting)
• Rotation: ±0.1% f.s.
• Duty ratio: ±1% (10 Hz to 10 kHz), ±4% (10 kHz to 100 kHz)
• Power frequency: ±0.032 Hz
• Integration, pulse duty ratio: ±1% f.s. (10 Hz to 10 kHz)
• Pulse width: ±0.1% f.s.
• Other functions Input pull up resistance: ON/OFF (10 kW connected to 5 V)
• Threshold level: -10 to +10 V variable, slope: rises and drops
• Level: High, Low, Hold ON/OFF
• Power terminal DIFFERENTIAL PROBE 9322 Power (the POWER CORD 9328 is required for connection)
• Accessories None * The input cord is optional