Mains Pulser (CED)


The CED 4001-16 Mains Pulser generates mains-frequency-locked pulses that can be used to reduce the magnitude of mains pickup (‘hum’) in recorded signals. The output is on a BNC connector, double-isolated from mains and consists of a train of 150 μs positive-going 5 V TTL pulses, suitable for direct connection to a 1401 Event input.

The Mains Pulser will run off any mains supply between 100 -240 V AC, 50 - 60 Hz. The case is earthed to mains earth. Current consumption is less than 100 mA.

Box size: 104 mm × 126 mm × 53 mm (W × D × H).

How to use the Mains Pulser

The recommended method of use is to record the pulses on an Event channel, alongside the waveform signal. Hum removal can then be done off-line, for example by using the Spike2 scripts HumRemove or HumRemoveExpress. Averaging with respect to the mains-generated pulses gives a good copy of the hum component, which can be subtracted from the polluted signal to provide a cleaner version. Click on the video tutorial below for a demonstration.

Removing mains hum from data (HumRemove)
This video tutorial demonstrates how to use TextMarks to annotate a data file.




Also see:



Fast Data Acquisition
and Analysis Interface (CED)

Power or Micro?

How to choose
between a Micro1401
and a Power1401



Low-cost Data Acquisition Unit

CED Software


for Data Acquisition and Analysis:
Signal and Spike2

Options for CED Power1401

Options and Expansions

for CED Power1401

Options for CED Micro3 and Micro1401 mk 2

Options and Expansions

for CED Micro1401

Accessories of CED Data Acquisition Interfaces


of CED Data Acquisition Interfaces
in general

CED Talkers

CED Talkers
and the
Talker Interface Box