Eight-Channel Low-Pass Filter Signal Conditioning

Eight-Channel Low-Pass Filter Signal Conditioning
bus
Eight-Channel Low-Pass Filter
Signal Conditioning Plug-on
VT1522
User’s Manual
The VT1522 manual also applies to Agilent/HP E1413Bs as Agilent/HP E1413 Option 12.
Enclosed is the User’s Manual for the VT1522 Signal Conditioning Plug-on. Insert this
manual in your VT1413C or Agilent/HP E1313 manual behind the “Signal Conditioning
Plug-ons” divider.
Copyright © VXI Technology, Inc., 2005
Manual Part Number: 82-0112-000
Printed: June 1, 2005
Printed in U.S.A.
VT1522
Eight-Channel Low-Pass Filter
Signal Conditioning Plug-on
Introduction
The VT1522 is a signal conditioning plug-on that provides eight fixed
low-pass filters with a nominal cutoff frequency of 100 Hz. Also provided is
input over-voltage protection and open transducer detection on each
channel.
About this Manual
This manual shows you how to control the signal conditioning plug-on
(SCP) using SCPI commands as well as Register-Based commands, and
explains the capabilities of this SCP. Finally, it covers specifications for this
SCP. The contents of this manual are:
·
·
·
·
·
·
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Identifying the Plug-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Connecting To The Terminal Module . . . . . . . . . . . . . . . . . 4
Programming With SCPI Commands . . . . . . . . . . . . . . . . . 6
Programming With Register Commands . . . . . . . . . . . . . . 8
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation
Installation for this plug-on is common to several others and is covered in
Chapters 1 and 2 of your VT1413C or Agilent/HP E1313A manual.
Identifying the Plug-on
You’ll find the VXI Technology part number on the connector side of the
SCP to the left of the serial number bar code. For the VT1522, the part
number is: VT1522.
Introduction
VT1522 Low-Pass Filter 3
Connecting to the Terminal Module
This section shows how to make connections to the terminal module.
The SCP connections for the terminal modules are shown on the stick-on
labels that came with the SCP. Use the appropriate label for the type of
terminal module you have. The connections and appropriate stickers are as
follows:
· For VT1413C and above terminal modules, use stickers for VT1522
SCPs. The connections are shown in Figure 1.
· For Agilent/HP E1313 terminal modules, use stickers for VT1522
SCPs. The connections are shown in Figures 2 and 3.
· For Agilent/HP E1413B and below terminal modules, use stickers
for Aglent/HP E1413 Option 12 SCPs. The connections are shown in
Figure 4.
Figure 1 VT1522 C-Size Terminal Module Connections
4
VT1522 Low-Pass Filter SCP
Connecting to the Terminal Module
Figure 2 VT1522 B-size Terminal Module Connections (Ch 00-31)
Figure 3 VT1522 B-size Terminal Module Connections (Ch 32-63)
Figure 4 Agilent/HP E1413 Option 12 Terminal Module Connections
Connecting to the Terminal Module
VT1522 Low-Pass Filter 5
Programming with SCPI Commands
The SCPI commands shown here are covered in Chapters 3 and 5 of your
VT1413C or Agilent/HP E1313 manual. This section will relate those
commands to the parameter values which are specific to this Plug-on.
Checking the ID
of the SCP
To verify the SCP type(s) installed on theVT1413C or Agilent/HP E1313
use the SYSTem:CTYPe? (@<channel>) command.
· The channel parameter specifies a single channel in the channel
range covered by the SCP of interest. The first channel number for
each of the eight SCP positions are; 0,8,16,24,32,40,48 and 56.
The value returned for the SCP in an Agilent/HP E1413B is:
HEWLETT-PACKARD,E1413 Opt 12 8-Channel Fixed Filter SCP,0,0
The returned value for the SCP in a VT1413C and Agilent/HP E1313A is:
HEWLETT-PACKARD,E1502 8-Channel Fixed Filter SCP,0,0
To determine the type of SCP installed on channels 0 through 7 send
SYST:CTYP? (@100)
query SCP type @ ch 0
enter statement here
Querying the
Filter State
While the low-pass filter SCP does not allow controlling whether the filters
are enabled or disabled, this state can be queried. The response to this query
will always be 1. To query any channel to determine if it is enabled or
disabled use the INPut:FILTer[:LPASs][:STATe]? (@<channel>)
command. The INP:FILT? command returns a 0 if the channel is OFF or a 1
if the channel is ON.
· The channel parameter must specify a single channel.
To query the filter state of channel 2 send
INP:FILT? (@102)
query channel 2
enter statement here
Querying the
Channel Gain
While the low-pass filter SCP does not provide amplifiers, the channel gain
can be queried. The response to this query will always be 1. To query any
channel to determine its gain setting use the INPut:GAIN? (@<channel>)
command. The INP:GAIN? command returns the current gain value for the
specified channel.
· The channel parameter must specify a single channel.
6
VT1522 Low-Pass Filter SCP
Programming with SCPI Commands
To query the gain setting of channel 8 send
INP:GAIN? (@108)
query channel 8
enter statement here
Detecting Open
Transducers
NOTES
This SCP provides a method to detect open transducers. When open
transducer detect (OTD) is enabled, the SCP injects a small current into the
HIGH and LOW input of each channel. The polarity of the current pulls the
HIGH inputs toward +17 V and the LOW inputs towards -17 V. If a
transducer is open, measuring that channel will return an over-voltage
condition. OTD is available on a per SCP basic. all eight channels of an
SCP are enabled or disabled together. See Figure 5 for a simplified
schematic diagram of the OTD circuit.
1) When OTD is enabled, the inputs have up to 0.2 µA injected into them. If
this current will adversely affect your measurement, but you still want to
check for open transducers, you can enable OTD, make a single scan, check
the CVT for bad measurements, then disable OTD and make your regular
measurement scans. The specifications apply only when OTD is off.
2) Allow 5 minutes before checking for open transducers to allow filter
capacitors to charge.
Signal Conditioning Plug-on
Signal Input
Multiplexer
High
High
+17 V
100 MW
3 kW
Gnd.
3 kW
100 MW
-17 V
Low
Low
Figure 5 Open Transducer Detect Circuit
Programming with SCPI Commands
VT1522 Low-Pass Filter 7
To enable or disable OTD, use the DIAGnostic:OTDetect <enable>,
(@<ch_list>) command.
· The enable parameter can specify ON or OFF
· An SCP is addressed when the ch_list parameter specifies a channel
number contained on the SCP. The first channel on each SCP is:
0, 8, 16, 24, 32, 40, 48 and 56
To enable OTD on all channels on SCPs 1 and 3:
DIAG:OTD ON, (@100,116)
0 is on SCP 1 and 16 is on SCP3
To disable OTD on all channels on SCPs 1 and 3:
DIAG:OTD OFF, (@100,116)
Register Based Programming
The register-based commands shown here are covered in Appendix D of the
VT1413C or Agilent/HP E1313 manual. You should read that section first
to become familiar with accessing registers and executing Register-Based
Commands. This section will relate those commands to the parameter values
which are specific to this Plug-on.
When Register Programming an SCP most communication is through the
Signal Conditioning Bus. For that you will use the Register Commands:
SCBWRITE <regaddr> <regvalue>
and
SCBREAD? <regaddr>
8
VT1522 Low-Pass Filter SCP
Register Based Programming
VT1522 Register Map
Read (returned value)
Write( <regvalue>)
SCP Register
Whole SCP Reg 0
SCP ID (808016)
<regaddr> Value
00ppp0000002
ppp=Plug-on
ccc=SCP
channel
In addition you will access bits in the card control register to control OTD.
Checking ID of SCP
To query an SCP for its ID value, write the following value to Parameter
Register 1:
( SCP number ) ´ 4016
Then write the opcode for SCBREAD? (080016) to the Command Register.
The ID value will be written to the Query Response Register.
Detecting Open
Transducers
Open Transducer Detection (OTD) is controlled by bits in the Card Control
Register. For more information on OTD see Figure 1.
Card Control Register
(Base + 1216)
15
14
14-13
12
11
10-8
7-0
PSI Pwr Reset
FIFO Mode
unused
FIFO Clear
VPPEN
A24 Window
Open Transducer Detect
Writing a one (1) to a bit enables open transducer detect on that signal
conditioning module. Writing a zero (0) to a bit disables open transducer
detect.
Register Based Programming
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SCP 7
SCP 6
SCP 5
SCP 4
SCP 3
SCP 2
SCP 1
SCP 0
VT1522 Low-Pass Filter 9
Specifications
These specifications for the VT1522 reflect the combined performance of
the VT1413C or Agilent/HP E1313 and the VT1522 signal conditioning
plug-on. These specifications are not to be added to those presented in the
VT1413C or Agilent/HP E1313 User’s Manual.
General Specifications
Measurement ranges
±62.5 mV to ±16 V FS
Volts (dc)
Temperature
Thermocouples - -200 to +1700 °C
Thermistors - (Opt 15 required) -80 to +160 °C
RTD’s - (Opt 15 required) -200 to +850 °C
(Opt 15 required) 128 W to 131 kW FS
Resistance
25,000 µe or limit of linear range of strain gage
Strain
Maximum input voltage
Operating: < ±16 V peak
Damage level: >±42 V peak
Operating: < ±16 V peak
Damage level: > ±42 V peak
(Normal mode plus common mode)
Maximum common mode
voltage
Normal mode rejection
-3.5 dB @ 100 Hz
>-24 dB @ 600 Hz
Common mode rejection
0 Hz - 600 Hz @ -90 dB
Input impedance
100 MW ± 10% (each differential input to ground)
Maximum tare cal offset
10
VT1522 Low-Pass Filter SCP
(Maximum tare offset depends on A/D range and SCP gain)
A/D range
±V F.Scale
16
4
1
0.25
0.0625
Max Offset
3.2213
0.82101
0.23061
0.07581
0.03792
Specifications
(90 days) 23 °C ± 1 °C (with *CAL? done after 1 hr warm up and CAL:ZERO?
within 5 min.). If autoranging is ON, add ±0.02% FS to accuracy specifications.
For E1313, multiply Noise Spec. by 1.4.
Measurement accuracy
(dc volts)
Range
±V FS
Linearity
% of reading
Offset Error
Noise
3 sigma
Noise*
3 sigma
0.0625
0.25
1
4
16
0.01%
0.01%
0.01%
0.01%
0.01%
7.2 µV
12.2 µV
33 µV
122 µV
488 µV
34 µV
60 µV
110 µV
450 µV
1.8 µV
15 µV
28 µV
92 µV
366 µV
1.5 mV
* [SENSe:]FILTer[:LPASs][:STATe] ON (max scan rate - 100 readings/second/channel)
Temperature Coefficients: Gain - 10 ppm/°C. Offset - (0 °C - 30 °C) no additional error, (30 °C - 40 °C) 0.1 µV/°C,
(40 °C - 55 °C) 2.4 µV+0.27 µV/°C
(90 days) 23 °C ± 1 °C (with *CAL? done after 1 hr warm up and CAL:ZERO? within
5 min.). If autoranging is ON, add ±0.02% FS to accuracy specifications.
Measurement accuracy
Temperature
(simplified specifications, see
temperature accuracy graphs in VT1413C/
Agilent/HP E1313 manual for details)
The temperature accuracy specifications include instrument and firmware linearization
errors. The linearization algorithm used is based on the IPTS-68(78) standard transducer
curves. Add your transducer accuracy to determine total measurement error.
Thermocouples
Type E
Type EEXtended
Type J
Type K
Type R
A/D Filter
-200 °C to 0 °C
0 °C to 200 °C
OFF
ON*
2.25 °C
1.65 °C
0.65 °C
0.34 °C
A/D Filter
-200 °C to 0 °C
0 °C to 200 °C
OFF
ON*
14.7 °C
13.8 °C
0.80 °C
0.49 °C
A/D Filter
-200 °C to 0 °C
0 °C to 200 °C
OFF
ON*
2.65 °C
2.00 °C
0.75 °C
0.38 °C
A/D Filter
-200 °C to 0 °C
0 °C to 400 °C
OFF
ON*
4.30 °C
3.35 °C
0.90 °C
0.50 °C
A/D Filter
0 °C to 100 °C
OFF
ON*
6.90 °C
3.80 °C
200 °C to 400 °C 400 °C to 800 °C
0.50 °C
0.24 °C
0.45 °C
0.23 °C
200 °C to 600 °C 600 °C to 800 °C
0.50 °C
0.30 °C
0.80 °C
0.45 °C
200 °C to 600 °C 600 °C to 775 °C
0.63 °C
0.32 °C
0.63 °C
0.32 °C
400 °C to 800 °C 800 °C to 1400 °C
0.85 °C
0.40 °C
1.10 °C
0.52 °C
100 °C to 200 °C 200 °C to 600 °C 600 °C to 1000 °C
5.00 °C
2.60 °C
4.00 °C
1.95 °C
3.10 °C
1.70 °C
* [SENSe:]FILTer[:LPASs][:STATe] ON (max scan rate - 100 readings/second/channel)
Specifications
VT1522 Low-Pass Filter 11
(simplified specifications, see temperature accuracy graphs in VT1413C/ Agilent/HP E1313
manual for details)
Measurement accuracy
Temperature (cont.)
Thermocouples (cont.)
Type S
Type T
A/D Filter
0 °C to 100 °C
100 °C to 200 °C 200 °C to 800 °C 800 °C to 1750 °C
OFF
ON*
8.00 °C
5.20 °C
5.60 °C
3.25 °C
4.45 °C
2.40 °C
3.30 °C
1.60 °C
A/D Filter
-200 °C to -100 °C
-100 °C to 0 °C
0 °C to 200 °C
200 °C to 400 °C
OFF
ON*
3.40 °C
2.25 °C
1.90 °C
0.78 °C
0.90 °C
0.46 °C
0.70 °C
0.33 °C
5 kW Reference Thermistor
A/D Filter
-10 °C to 65 °C
65 °C to 85 °C
OFF
ON*
0.011 °C
0.0095 °C
0.021 °C
0.0115 °C
A/D Filter
-125 °C to 75 °C
OFF
ON*
0.75 °C
0.36 °C
100 W Reference RTD
100 W RTD
A/D Filter
-200 °C to 75 °C 75 °C to 300 °C 300 °C to 600 °C 600 °C to 970 °C
OFF
ON*
0.19 °C
0.11 °C
0.37 °C
0.21 °C
0.43 °C
0.36 °C
0.53 °C
0.46 °C
A/D Filter
0 °C to 30 °C
30 °C to 70 °C
70 °C to 80 °C
80 °C to 100 °C
OFF
ON*
0.012 °C
0.010 °C
0.013 °C
0.012 °C
0.014 °C
0.010 °C
0.024 °C
0.014 °C
A/D Filter
0 °C to 30 °C
30 °C to 70 °C
70 °C to 85 °C
OFF
ON*
0.014 °C
0.011 °C
0.027 °C
0.017 °C
0.048 °C
0.027 °C
A/D Filter
0 °C to 30 °C
30 °C to 60 °C
60 °C to 90 °C
90 °C to 115 °C
OFF
ON*
0.015 °C
0.013 °C
0.024 °C
0.016 °C
0.034 °C
0.021 °C
0.059 °C
0.032 °C
2252 W Thermistor
5 kW Thermistor
10 kW Thermistor
12
VT1522 Low-Pass Filter SCP
Specifications
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