Specifications

Section 7. Measurement Instructions
CR23X
Pi
20k
CR3000
FIGURE 7.7-2. Conditioning Large Voltage Pulses
The maximum input voltage on a pulse channel is ±20 V. Refer to Figure
7.7-2 if reducing input voltage is required.
• Pulse Channels
Maximum Input Voltage: ±20 V
High Frequency Input
• Pulse Channels
Minimum Pulse Width: 1.2 microsecond
Maximum Frequency: 250 kHz
(50% Duty Cycle)
Lower Threshold: 0.9 V*
Upper Threshold: 2.2 V*
When a pulse channel is configured for high-frequency pulse, there is an
internal 100 kohm pull-up resistor to 5 V on the pulse channel. This pull-up
resistor accommodates open-collector output devices for high-frequency input.
*Larger input transitions are required at high frequencies because of the input
RC filter with 1.2 microsecond time constant. Signals up to 250 kHz will be
counted if centered around +2.5 V with deviations ≥ ± 2.5 V for ≥ 1.2
microseconds.
• Control Ports
A high frequency sensor is connected between C1..C8 and 5V.
Low Level AC (Pulse Channels Only)
Input Hysteresis: 16 mV
Maximum Input Voltage: 20 V peak-to-peak
Input Voltage and Frequency Range
(16 bit counter required above 2.56 kHz)
20 mV 1.0 Hz to 20 Hz
200 mV 0.5 Hz to 200 Hz
2000 mV 0.3 Hz to 10 kHz
5000 mV 0.3 Hz to 20 kHz
7-22