ADC 6014 Manual de usuario descargar pdf (Pagina 10)

Model 6013/6014

LED and LED Off turn on and off the LED on the front

of the channel card. This feature is helpful to quickly

locate channel hardware associated with a

measurement Name and to verify communications

with the channel hardware.

Set Many and Copy provides means to program

multiple channels without reentering all fields. Set

Many brings up a screen in which multiple parameters

may be programmed for multiple selected channels

simultaneously. It is a very quick way to set multiple

channels to the same configuration. Copy clones the

selected channel to other channels. Each of the othe

channels must subsequently be given a new and

different Name. This screen is useful for

programming a new test, particularly if there are large

numbers of channels with similar inputs.

Download sends the programmed parameters to the

Channel or to all channels in the Scan list.

Programming is stored in memory as it is entered. It

must be explicitly downloaded to update the hardware

settings. PI660 will warn if preview or recording is

started without downloading new or changed

parameters. New or changed parameters must also

be saved to the test database. Selecting Save Test

or Save Test As on the File menu does this. Again,

PI660 will give a reminder if the program is exited

without saving changed or new parameters.

The plot button, a graph icon, brings up a plot of the

last data recorded for this channel, assuming there is

some. If the data exceeded full scale on the previous

run, an OVERLOAD will be indicated.

4-7.2 Voltage Substitution Calibration

Series 6000 is designed so that high-level calibration

signals may be distributed to the input modules. The

signals are buffered and attenuated on the module to

a level appropriate to the channel gain. The

calibration input has a 50K Ohm input impedance.

When many modules are connected to the same

calibration source, loading effects must be

considered.

During voltage substitution calibration, the transducer

input is disconnected and the differential amplifier

input is connected to the enclosure’s calibration bus.

A calibration signal is distributed from J3 on the rear

panel to each module. There it is buffered,

attenuated and applied to the enclosure’s calibration

bus. The attenuator may be programmed for 1.0, 0.1,

0.01 and 0.001.

Best accuracy is obtained by calibrating each channel

on the module individually. This reduces attenuator

loading by the amplifier’s input impedance. A serious

problem may occur if multiple channels are calibrated

simultaneously and any of the channels has an

overscale input. This could occur, for example, if the

channel gain settings were different. The overscale

channel will have low-input

impedance that will cause significant loading errors

and erroneous calibration data.

All modules in an enclosure share the enclosure’s

calibration bus. If 16 input modules are present, this

presents a 3.125K load to the calibration source.

Care must be taken to use a low output impedance

source. Do not use an attenuated source, which can

have high-output impedance. If multiple enclosures

are used on a single calibration source, source

loading must be investigated to assure it will not

degrade the required accuracy.

4-7.3 Amplifier

Each channel has an instrumentation amplifier to

amplify the input signal. The amplifier has a guarded,

differential input that rejects common mode signals to

±10 Volts. Inputs are protected to ±50 Volts

differential or common mode.

4-7.3.1 Inputs

Proper input connections are essential to achieving

rated amplifier performance. In particular, the guard

shield must enclose all input signals and be properly

terminated as close as possible to the source of

common mode voltage.

4-7.3.2 Gain

Amplifier gain is selected from one of twelve

calibrated steps. Gain steps: 1, 2, 5, 10, 20, 50, 100,

200, 500 1,000, 2,000 and 5,000 are factory

calibrated to ±0.05%. The selected gain applies to

both the digitized and analog outputs; however, only

the digitized output is calibrated. The analog output is

provided as a monitor. The 6014 has full bandwidth

specified only to gain of 100. Gains above 100 are

useable, but have reduced bandwidth.

4-7.3.3 Auto Zero

Amplifier Zero is automatically restored when the

enclosure is turned on or Reset. Amplifier zero is

automatically performed whenever gain or filter is

programmed. The range is sufficient to accommodate

both input and output related zero errors. Autozero

may be turned on and off by a check-box on the

channel parameters screen in PI660.

Filter Plug-In

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ADC 6014 Manual de usuario Pagina 10

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