2201 Racal Universal Counter / Timer

The EADS / Racal 2201 Universal Counter / Timer is a high-performance, 2-channel, 225 MHz Universal Counter/Timer for applications from research and development benchtop to automatic test equipment. The module offers nine automatic measurement functions and contains an optional 1.3 GHz third input available for RF requirements.

The 2201 offers nine automatic measurement functions: Frequency, Period, Time Interval, Time Interval Delay, Pulse Width, Frequency Ratio Channel A to B, Totalize, Phase and Peak Signal Voltage.

The manual trigger mode is programmable from -5.1 V to + 5.1 V (-51 V to + 51 V in X10 mode) with an exceptional resolution of 10 mV (100 mV in X10 mode). An automatic trigger mode is also available covering the frequencies from 100 Hz to 150 MHz.

Automatic trigger mode automatically switches attenuator settings if the input signal exceeds 5.1 Vpk-pk.

Automatic triggering establishes the peak voltages for setting trigger points. Users employ this feature to measure peak voltage levels.

The 2201 contains an independent 100 kHz low-pass filter on each channel to reduce input stage sensitivity when making low-frequency measurements.

Users may improve stability by using an external clock or one of the two optional internal high stability time bases. The internal time base options are: TCXO: Standard and OCXO: Option 11.

Option 08 (Analog Output) provides a high-accuracy source to drive devices like chart recorders. This option is especially useful in measuring and recording the aging and temperature stability of devices like oscillators and Voltage to Frequency (V-F) converters.

The Model 2201 allows fine control of gate-time and delay-time settings with 46 pre-defined times ranging from 100 µs to 10 seconds. In addition, gate or delay may be set to any value between 100 µs and 1000 seconds using an external input.