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In vivo applications / Behavioural applications / BioStim stimulation system
BioStim Monopolar Stimulus Isolator
Monopolar Battery-supplied Stimulus Isolator STE-8x is one of the most sophisticated stimulus isolator constructions in the choice of Supertech Instruments. Its counterpart is the Bipolar Battery-supplied Stimulus Isolator for bipolar pulse output. This Stimulus Isolator is supplied from its built-in rechargeable battery pack. Our battery-supplied stimulus isolators are floating equipments. It means, that they have got negligible capacity to the mains or to the ground (> 10 pF).
Monopolar Battery-supplied Stimulus Isolator STE-8x can be used even in the highly noise-sensitive microelectrode experiments (for example multi-electrode patch clamp environments). It passes extremely small, practically zero hum noise into the biological tissue. This version of Stimulus Isolator is optimized for that aspect, that it does not generate any electric hum noise, because of this battery-powered scheme. According to this feature it can be placed close to the experimental object anywhere, even in a seriously shielded environment.
Monopolar Battery-supplied Stimulus Isolator STE-8x can be used either in microelectrode experiments or in body surface applications on animals.
There are both a Constant Current generator and a Constant Voltage generator built into this stimulus isolator. The output of the Stimulus Isolator can be switched between Constant Current and Constant Voltage modes on-the-fly, during the experiment. It is a very useful feature, because the first stimulating trials can be carried out in the secure Constant Voltage mode. If the experiment is qualitatively working, the Stimulus Isolator can be switched immediately into Constant Current mode, where the electric charge can be defined and calculated exactly.
Monopolar Battery-supplied Stimulus Isolator STE-8x is supplied from its built-in rechargeable battery pack. There is an independently orderable accessory: the Battery Manager unit, which is an automatic and precision battery charger and conditioner equipment. Since the Stimulus Isolator is supplied from its built-in battery pack, the charger function, provided by the Battery Manager is indispensable to operate it. With a new battery pack the average operation time (the efficient working period between two charging actions) is approximately 12 hours. If you take care of the battery pack, its lifetime will be at least two years, if the Stimulus Isolator is used every day, the battery pack is charged if necessary, but the battery pack is never over-discharged. These task are carried out by the Battery Manager.
Monopolar Battery-supplied Stimulus Isolator STE-8x has got its own, optically isolated, standard TTL control input. If your PC-based pattern generator (or universal DAQ) program has a hardware interface with standard TTL digital pulse pattern output, it is not necessary to order a BioStim Computer Interface, because the Monopolar Battery-supplied Stimulus Isolator can be connected directly to that digital output.
Specifications / Technical Data
- Constant Voltage mode has got two full scale ranges: 10 V; 100 V
- Constant Current mode has got two full scale ranges: 100 µA; 10 mA
- Compliance voltage: 120 V
- Worst-case amplitude error of the constant voltage and the constant current generators: < 5 %
- Nonlinearity of the constant voltage and the constant current generators: < 5 %
- Output leakage current is internally trimmed to nearly absolute zero, it is less than 1 µA.
- Output overshoot: < 6 % in constant voltage mode; 0 (zero) in constant current mode
- Output rise time of the constant current generator: 50 µs (on 1 kOhm load); 70 µs (on 10 kOhm load)
- Output fall time of the constant current generator: 60 µs (on 1 kOhm load); 80 µs (on 10 kOhm load)
- Output amplitude in the selected range can be set using a 10-turn calibrated helical potentiometer on the front panel.
- Resolution of the helical potentiometer: 0.1 %
- Protected, 2500 V, optically isolated TTL signal conditioner circuits at the inputs
- Double security isolation
- Active level at the control inputs: TTL High
- Control inputs: TTL compatible, 1 unit-load
- Power source: built-in rechargeable battery pack
- Nominal voltage of the internal battery pack: 120 V
- Nominal capacity of the battery pack: 170 mAh
- Compatible with the Battery Manager equipment
Descriptions
Monopolar Battery-supplied Stimulus Isolator STE-8x is one of the most sophisticated stimulus isolator constructions in the choice of Supertech Instruments. Its counterpart is the Bipolar Battery-supplied Stimulus Isolator for bipolar pulse output. This Stimulus Isolator is supplied from its built-in rechargeable battery pack. Our battery-supplied stimulus isolators are floating equipments. It means, that they have got negligible capacity to the mains or to the ground (> 10 pF).
Monopolar Battery-supplied Stimulus Isolator STE-8x can be used even in the highly noise-sensitive microelectrode experiments (for example multi-electrode patch clamp environments). It passes extremely small, practically zero hum noise into the biological tissue. This version of Stimulus Isolator is optimized for that aspect, that it does not generate any electric hum noise, because of this battery-powered scheme. According to this feature it can be placed close to the experimental object anywhere, even in a seriously shielded environment.
Monopolar Battery-supplied Stimulus Isolator STE-8x can be used either in microelectrode experiments or in body surface applications on animals.
There are both a Constant Current generator and a Constant Voltage generator built into this stimulus isolator. The output of the Stimulus Isolator can be switched between Constant Current and Constant Voltage modes on-the-fly, during the experiment. It is a very useful feature, because the first stimulating trials can be carried out in the secure Constant Voltage mode. If the experiment is qualitatively working, the Stimulus Isolator can be switched immediately into Constant Current mode, where the electric charge can be defined and calculated exactly.
Monopolar Battery-supplied Stimulus Isolator STE-8x is supplied from its built-in rechargeable battery pack. There is an independently orderable accessory: the Battery Manager unit, which is an automatic and precision battery charger and conditioner equipment. Since the Stimulus Isolator is supplied from its built-in battery pack, the charger function, provided by the Battery Manager is indispensable to operate it. With a new battery pack the average operation time (the efficient working period between two charging actions) is approximately 12 hours. If you take care of the battery pack, its lifetime will be at least two years, if the Stimulus Isolator is used every day, the battery pack is charged if necessary, but the battery pack is never over-discharged. These task are carried out by the Battery Manager.
Monopolar Battery-supplied Stimulus Isolator STE-8x has got its own, optically isolated, standard TTL control input. If your PC-based pattern generator (or universal DAQ) program has a hardware interface with standard TTL digital pulse pattern output, it is not necessary to order a BioStim Computer Interface, because the Monopolar Battery-supplied Stimulus Isolator can be connected directly to that digital output.
Specifications / Technical Data
- Constant Voltage mode has got two full scale ranges: 10 V; 100 V
- Constant Current mode has got two full scale ranges: 100 µA; 10 mA
- Compliance voltage: 120 V
- Worst-case amplitude error of the constant voltage and the constant current generators: < 5 %
- Nonlinearity of the constant voltage and the constant current generators: < 5 %
- Output leakage current is internally trimmed to nearly absolute zero, it is less than 1 µA.
- Output overshoot: < 6 % in constant voltage mode; 0 (zero) in constant current mode
- Output rise time of the constant current generator: 50 µs (on 1 kOhm load); 70 µs (on 10 kOhm load)
- Output fall time of the constant current generator: 60 µs (on 1 kOhm load); 80 µs (on 10 kOhm load)
- Output amplitude in the selected range can be set using a 10-turn calibrated helical potentiometer on the front panel.
- Resolution of the helical potentiometer: 0.1 %
- Protected, 2500 V, optically isolated TTL signal conditioner circuits at the inputs
- Double security isolation
- Active level at the control inputs: TTL High
- Control inputs: TTL compatible, 1 unit-load
- Power source: built-in rechargeable battery pack
- Nominal voltage of the internal battery pack: 120 V
- Nominal capacity of the battery pack: 170 mAh
- Compatible with the Battery Manager equipment
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