Practical Instrument Electronics 850 - Manual (Page 42)

Page 40
Pr
eliminar
y
Frequency Source
Ranges
1 to 2000 CPM, 0.01 to 999.99 Hz, 0.1
to 9999.9 Hz, 0.001 to 20.000 kHz
Accuracy ± (0.02 % of Reading + 0.01% Full Scale)
Output Waveform Square Wave, Zero Crossing -1.0 to +5 V
peak-to-peak ±10%
Risetime (10 to 90% of
amplitude)
< 10 microseconds
Output Impedance < 1 Ohm
Source Current > 1 mA rms at 20 kHz
Short Circuit Duration Infinite
Optical Coupling
Green LED (HZ SYNC) flashes at
output frequency
Frequency Read
Ranges & Accuracy
Same as Frequency Source
Accuracy ± (0.02 % of Reading + 0.01% Full Scale)
Trigger Level 1 V rms, dc coupled
Input Impedance > 1 Meg Ohm + 60 pF
Specifications