24 Output Pulse Distribution Unit

The Time & Frequency Solutions Model PDU-240 offers the user modern, often requested and reliable pulse distribution features. The base unit outputs twenty-four 1PPS outputs that are transformer-coupled from the rear panel connectors to the transfer switch. Each output is a faithful reproduction of the pulse input.

A three-position front panel switch chooses automatic operation or may be used to manually select one of the two input sources. When the AUTO mode is selected the AUTO indicator will be illuminated and Input A will be used if it is available. Should Input A fail Input B will be chosen automatically. Indicators show the status of the inputs and which input has been selected.

Each of the twenty-four outputs is monitored. Should an output fail a group alarm Fault indicator will illuminate.


  • Wide Input Bandwidth
  • Input Isolation
  • Automatic & Manual Changeover
  • Transformer Coupled Outputs
  • Twenty four Outputs
  • Front Panel Status Indicators
  • Fault Discrete Inputs
  • Compact 1U, 19” rack mount


Pulse Inputs
Number of Inputs 2
Connector Type BNC
Input Amplitude 2.5 to 10 V
Input Impedance 50 / 1000 link selectable
Pulse 1ppm through 10MPPS
Fault Discrete Inputs
Number of Inputs 2
Connector Type DB9
Input Level Relay contact closure or TTL
Pulse Outputs
Pulse 1ppm through 10MPPS
Number of Outputs 24
Connector Type BNC
Output Amplitude 3.3V, 5V, 10V
Isolation Transformer coupled
Output Impedance 50 ohms
Output Protection Short-circuit proof
Fault Sense and Transfer
Modes Automatic and Manual
Manual Selects input A or input B
Automatic Provides automatic switch from A to B should input A fail
Power Green LED
Input A-B Selected Green LEDs, two
Input A-B Available Green LED's, two
Fault Red
Operating 0 to +50°C
Storage -40 to +85°C
Humidity To 95% non-condensing
Dimensions 19 in. Rack Mount, 1/73 in. high (1U), 14.5 in. deep
Weight 7.5 lb. typical
Power 115/230 VAC, 50/60 Hz
Power Consumption <25 W
EMC Emmission To EN50081-1 as EN55022
EMC Immunity To EN50082-1 as EN1000-4-2 ESD, IEC 801-3 HF Field, IEC 801-4 Burst

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