Table 83. Low-Level Ac Amplitude and Maximum Measured
Frequency
Ac mV (RMS) Maximum Frequency
20
200
2000
5000
20
200
10,000
20,000
Figure 94. Amplitude reduction of pulse-count waveform (before and after
1 µs time-constant filter)
8.1.4 Period Averaging — Details
Related Topics:
• Period Averaging — Specifications
• Period Averaging — Overview
(p. 70)
• Period Averaging — Details
(p. 360)
The CR1000 can measure the period of a signal on a SE terminal. The specified
number of cycles is timed with a resolution of 136 ns, making the resolution of
the period measurement 136 ns ns divided by the number of cycles chosen.
Low-level signals are amplified prior to a voltage comparator. The internal
voltage comparator is referenced to the programmed threshold. The threshold
parameter allows referencing the internal voltage comparator to voltages other
than 0 V. For example, a threshold of 2500 mV allows a 0 to 5 Vdc digital signal
to be sensed by the internal comparator without the need of any additional input
conditioning circuitry. The threshold allows direct connection of standard digital
360
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