A-M Systems 2200 Manuale di istruzioni - Pagina 6

Sfoglia online o scarica il pdf Manuale di istruzioni per Unità di controllo A-M Systems 2200. A-M Systems 2200 19. Analog stimulus isolator

applications requiring the highest voltages (for example, trying to push "large" currents

through high resistance electrodes), it may be necessary to set the Polarity switch to the

dominant polarity of your signal. For most users, it should be necessary to set the Polarity

switch to the dominant polarity of you signal. For most users, it should be adequate to leave

the switch set to Bipolar, giving equal range for both positive- and negative-going signals.

For the most challenging cases, you may double the output power by combining two units.

For users requiring the lowest possible offset voltage or current, it maybe necessary to

readjust the Offset. Use the small insulated screwdriver (supplied with the Model 2200) to

zero the output while the input voltage is set to zero. It is best to do this with the Range

switch set to the desired position.

Battery Testing and Maintenance

There are two batteries: a small 9V "transistor" NiMH battery used to power the input section;

and a larger gelled-electrolyte 12V battery used to power the output. Both are rechargeable.

The internal batteries are designed to last at least 8 operating hours from a full charge. Brand-

new batteries often have a slightly reduced capacity, which improves after a few charge-

discharge cycles.

There are two methods to test the state of the batteries. From the front panel, simply turn the

Power to Off, and push the Battery/Test push-button. The Battery/OK LED will light if both

battery voltages are sufficiently high. Warning: this light does not indicate how long the

charge will remain high It is up to the user to maintain the battery charge properly.

To preserve maximum battery life, use the full battery capacity. Do not routinely discharge the

battery completely as the gelled-electrolyte (12V) battery life will eventually deteriorate if you

discharge it too far. At the other extreme, do not frequently discharge the batteries to a small

fraction of their capacity: shallow discharging of the unit may lead to diminished charge life of

the input-side (9V) battery.

If battery charge life is a problem, the simplest solution is to keep on hand a supply of one or

more sets of fully charged replacement batteries in addition to the internal set. - It is easy to

change the batteries: turn the Power switch Off, turn the unit upside-down, and unscrew the

two recessed Phillips head bolts (see figure 1). While holding the unit together, turn the unit

right-side up. The top side of the case comes off with an easy vertical pull. The 9V battery is

in a battery holder on the horizontally-mounted circuit board; simply pry the discharged unit

out (pull on the attached tab), and replace with another battery. Disconnect the wire from the

larger 12V battery at the connector to the circuit board. Now pull the battery from the Velcro®

pad that it is sitting on. Replace the battery, making sure that it is firmly pressed into the pad.

Reconnect the new battery to the circuit board, making certain that the keyed connector is

locked together with the correct orientation! If the connector does not go together easily, you

may have it upside-down. Reinstall the top cover and tighten the two bolts. Pushing the Test

push button should now light the Battery OK LED.

A-M Systems

PO BOX 850, Carlsborg, WA 98324 USA

Telephone: 800-426-1306 * 360-683-8300 * FAX: 360-683-3525

E-mail: [email protected] * Website: http://www.a-msystems.com