Model 6013/6014
4-7.4 Filte
The standard anti aliasing filter is a four-pole,
Butterworth low pass with plug-in frequenc
selection. Unless specified otherwise, a 10 Hz
plug-in is supplied. Plug-ins are available from 10
Hz to 1 kHz. Special filters are available from 4 Hz
to 1 kHz.
The filter plug-ins are pictured above. They are
marked with the cutoff frequency and location of
Pin 1. Insert them so that Pin 1 is to the right
when viewed from the front of the module. The
label faces the front of the board as shown in the
photograph below.
The digitized output may be selected for wideband or
filtered response on the Channel Parameters screen.
Wideband is less than 1.5 kHz. The analog output is
wideband.
4-7.5 Sample & Hold
The sample & hold freezes the output of all channels
simultaneously. It can be employed where time
correlation of data is critical. However, when used, it
introduces a small error in the form of droop. The
droop varies from channel to channel, being the
lowest on the first channel and the highest on the last
channel converted by the ADC. Unless otherwise
specified, the 6013 and 6014 are provided with the
sample & hold disabled. It can be enabled by the use
of Calibration and Maintenance software.
4-7.6 Analog to Digital Converter
The 6013 and 6014 use a single analog to digital
converter (ADC) to digitize all eight channels. The
sample & hold output of each channel is multiplexed
to the ADC input sequentially from channel 0 to 7.
Data from the ADC is stored in on-board registers
until it is sent to the system DDS.
Channels are digitized at the highest system sample
rate even if a channel’s data is output at a slower rate.
For example, if the highest system sample rate is 8K,
all
channels will be digitized at 8K samples per second,
but each channel’s output rate may be programmed
as 8K, 4K, 2K, 1K, 500, ….. samples per second.
4.7.7 Warning & Alarms
Clicking the Warnings & Alarms button on the
Channel Parameters screen brings up the Analog
Input Alarms screen for programs warning and
alarms.
High and low warning and alarm limits (4 limits) may
be programmed for each channel. Data is checked
against limits on each digitization cycle. Any channel
that exceeds the limits generates a warning or alarm
output. Warning and alarms are bussed in the
enclosure and from enclosure to enclosure.
Exceeding the limits of any channel generates a
warning or alarm for the system.
Warning and Alarms have similar setups and apply to
the indicated Channel. Set the limits in engineering
units. The high and low limits are independent.
Colors may be selected for data not in warning or
alarm and for data in Warning and Alarm. Data are
displayed in these colors on tabular, bar chart, strip
chart and x-y displays.
4-7.8 Parameter Storage
Two non-volatile memories are employed to store
channel calibration and operating parameters. One o
these memories, an EEPROM on the input/output
module, stores calibration and other information
specific to the channels on the module.
The other memory is a battery backed-up RAM on the
channel controller that stores the programmed
operating parameters for each channel installed in the
enclosure. When power is turned on or Reset given,
the calibration data is first loaded in the channels then
they are programmed by the channel controlled with
the last downloaded operating parameters.
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