The Master-8 is an 8-channel programmable pulse-generator based on advanced microprocessor technology. Master-8 can activate up to 8 different instruments. Master-8 is a very flexible system since it does not use a master clock to control all the channels. Each channel operates independently in one of several modes and can be internally connected to other channels. With Master-8 you can easily switch your set-up between 8 preprogrammed settings by a single command.
This allows several users to work on the same experimental set-up without reprogramming Master-8 every time. The amplitude and polarity of each channel are fixed by the dials and switches on the front panel. All the other parameters of each channel and the internal connections are set by inserting the new parameter via the keyboard.
Types of Master-8
Master-8 8-channel programmable pulse-generator, 2 channels with ten-turn dial
Master-8/U 8-channel programmable pulse-generator, all channels with ten-turn dial
Master-8/CP 8-channel programmable pulse-generator, 2 channels with ten-turn dial, computer-controlled time settings
Master-8/CPU 8-channel programmable pulse-generator, all channels with ten-turn dial, computer-controlled time settings
Each channel can operate in any of the following modes:
Free Run: The channel generates pulses continuously, time rate and duration of the pulses can be set individually for each channel.
Trig: After triggering (manually by one keystroke, internally from other channels or externally from other devices) the channel delivers a single pulse at the preset delay and duration times.
Train: After triggering, the channel delivers a preset number of pulses with the set interval and duration times. Master-8 can automatically display the serial number of the pulse in the train for one channel.
DC: The channel delivers a DC output independent of the time setting. The user can turn the DC output on and oft manually.
Channels 1 and 2 can operate in an additional mode:
Gate: Each time that an external signal is applied, the channel operates as in FREE RUN mode. When the external input stops the ceases working.
Each channel can be internally connected to the other channels. There is no need to connect wires between channels. Each channel can be internally connected to many channels simultaneously.
Eight stored Settings
With Master-8 you can easily switch your set-up between 8 preprogrammed independent settings (paradigms). Each paradigm specifies the modes and parameters of all the channels and their internal connections. The switching from one paradigm to another is very fast (50 ms). All the paradigms are stored in the memory even after the power is off.
Each channel can produce an pulse with an amplitude ranging from -10V to +10V and a maximum current of 20mA.
Each channel operates with the following ranges:
|Number of Pulses per Train||1||59990|
|Pulse Duration||40 µs||3999 s|
|Delay Time||100 µs||3999 s|
|Interval Time||60 µs||3999 s|
All parameters of all the 8 paradigms are stored in the memory even after the power is switched off. Since a negligible current is used for memory retention, there is no need for rechargeable batteries and their charging mechanism. Parameters are retained by an AA size lithium battery with a guaranteed five of seven years.
Master-8 has a built-in program which enables the user to easily check all the parameters of each channel and the interconnections between channels.
Three additional outputs deliver combined multilevel pulses:
Out 2+3 - bilevel pulses (e.g. +/- pulses).
Out 6+7+8 - 3 level pulses.
Combined Output - up to 7 level pulses.
Two Additional Clocks
In addition to its standard 8 channels, Master-8 features 2 internal clocks. The first one counts the time in seconds up to 24 h and is used to measure the time elapsed from an event (e.g. the beginning of the experiment). The second one counts the time in tens of seconds up to 1 h and is used to measure intermediate times.
The TIMER can change the mode of any single channel at a fixed time up to 24 h ahead. For example, if the user wants to set the experiment to stop at a given time, he can instruct one channel (or all of them) to do so.
Master-8 can be mounted in a standard 19 inch rack.
Control of the Master-8
- As a stand alone unit - via its front panel keys
- Via a PC - using the Master-8 Control Software
- From within you own program - using the Master-8 SDK (Software Development Kit)