VXI VT1509A User Manual

Eight-Channel
Fixed Filter and Amplifier
Signal Conditioning Plug-on
VT1509A

User’s Manual

The VT1509A manual also applies to Agilent/HP E1413s as Agilent/HP E1413 Option 19.

Enclosed is the User’s Manual for the VT1509A Signal Conditioning Plug-on. Insert this
manual in your VT1413C and Agilent/HP E1313 manual behind the “Signal Conditioning
Plug-ons” divider.

bus

Manual Part Number: 82-0083-000 Printed: June 16, 2003

Printed in U.S.A.

Copyright © VXI Technology, Inc., 2003

Eight-Channel Fixed Filter and Amplifier

Introduction

About this Manual

VT1509A

Signal Conditioning Plug-on

The VT1509A is a Signal Conditioning Plug-on that provides eight fixed
low-pass filters with a 3 dB cutoff frequency of 7 Hz and eight amplifiers
with gain of 64. Also provided is input over-voltage protection and open
transducer detection on each channel.

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

Installation for this Plug-on is common to several others and is covered in
Chapters 1 and 2 of your VT1413C or Agilent/HP E1313 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 VT1509A, the part
number is : VT1509A.

· 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

Introduction VT1509A Fixed Filter+Amplifier SCP 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

VT1509A SCPs. The connections are shown in Figure 1.

· For Agilent/HP E1313 Terminal Moduless, use stickers for

VT1509A SCPs. The connections are shown in Figures 2 and 3.

· For Agilent/HP E1413B and below Terminal Modules, use stickers

for HP E1413 Option 19 SCPs. The connections are shown in
Figure 4.

Figure 1 VT1509A C-Size Terminal Module Connections

4 VT1509A Fixed Filter+Amplifier SCP Connecting To The Terminal Module

Figure 2 VT1509A B-size Terminal Module Connections (Ch 00-31)

Figure 3 VT1509A B-size Terminal Module Connections (Ch 32-63)

Figure 4 Agilent/HP E1413B Option 19 Terminal Module Connections

Connecting To The Terminal Module VT1509A Fixed Filter+Amplifier SCP 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

Querying the Filter

Cutoff Frequency

To verify the SCP type(s) installed on the VT1413C 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 19 8-Channel Fixed Gain-Filter SCP,0,0

The value returned for the SCP in a VT1413C or an Agilent/HP E1313A is:

HEWLETT-PACKARD,E1509 8-Channel Fixed Gain-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

While the the VT1509A does not provide programmable cutoff frequency
the filter frequency can be queried. The response to this query will always
be 7. To query any channel for its cutoff frequency use the
INPut:FILTer[:LPASs]:FREQuency? (@<channel>) command. The
INP:FILT:FREQ? command returns the numeric cutoff value currently set
for the channel specified.

Querying the

Filter State

6 VT1509A Fixed Filter+Amplifier SCP Programming With SCPI Commands

· The channel parameter must specify a single channel.

To query the cutoff frequency of channel 6 send

INP:FILT:FREQ? (@106) query channel 6

enter statement here

While the VT1509A 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.

Signal Conditioning Plug-on

Multiplexer

Signal Input

High

Low

100M

-17V

3K

Gnd.

3K

100M

+17V

High

Low

To query the filter state of channel 2 send

INP:FILT? (@102) query channel 2

enter statement here

Querying the

Channel Gain

Detecting Open

Transducers

While the VT1509A’s amplifiers have fixed gain, the channel gain can be
queried. The response to this query will always be 64. 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.

To query the gain setting of channel 8 send

INP:GAIN? (@108) query channel 8

enter statement here

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 volts and the LOW inputs towards -17 volts. 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.

Programming With SCPI Commands VT1509A Fixed Filter+Amplifier SCP 7

Figure 5 Open Transducer Detect Circuit

NOTES 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.

To enable or disable Open Transducer Detection, 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 Open Transducer Detection 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 Open Transducer Detection 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 VT1509A Fixed Filter+Amplifier SCP Register Based Programming

VT1509A Register Map

Read (returned value) Write( <regvalue>) SCP Register <regaddr> Value

SCP ID (902016) Whole SCP Reg 0 00ppp000000

ppp=Plug-on
ccc=SCP
channel

In addition you will access bits in the Card Control register to control Open
Transducer Detection.

Checking ID of SCP To query an SCP for its ID value, write the following value to Parameter

Register 1:

( )SCP number ´ 40

Then write the opcode for SCBREAD? (080016) to the Command Register.
The ID value will be returned to the Query Response Register.

16

2

Detecting Open

Transducers

15 14 14-13 12 11 10-8 7-0

PSI Pwr Reset FIFO Mode unused FIFO Clear VPPEN A24 Window Open Transducer Detect

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)

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.

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

Register Based Programming VT1509A Fixed Filter+Amplifier SCP 9

Specifications

General Specifications

Measurement ranges

These specifications for the VT1509A reflect the combined performance of
the VT1413C or Agilent/HP E1313 and the VT1509A Signal Conditioning
Plug-on. These specifications are not to be added to those presented in the
VT1413C or Agilent/HP E1313 User’s Manual.

DC Volts

Temperature

Resistance

Strain

Maximum input voltage

(Normal mode plus common mode)

Maximum common mode
voltage

Normal mode rejection

±3.9 mV to ±0.25 V FS

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) 128W to 131 kW FS

25,000 µe or limit of linear range of strain gage

Operating: < ±16 V peak Damage level: > ±42 V peak

Operating: < ±16 V peak Damage level: > ±42 V peak

@ 7 Hz -3 dB, @ 60 Hz >-25 dB

Common mode rejection

Input impedance

Maximum tare cal offset

10 VT1509A Fixed Filter+Amplifier SCP Specifications

0 - 60 Hz -100 dB

100 MW±10% (each differential input to ground)

(Maximum tare offset depends on A/D range and SCP gain)

A/D range

±V F.Scale

Max Offset 0.04970 0.01220 0.00297 0.00055 N/A

16 4 1 0.25 0.0625

Measurement accuracy
DC Volts

(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 Agilent/HP E1313, multiply Noise Spec. by 1.4.

Gain 64

Temperature Coefficients: Gain - 15 ppm/°C. Offset - (0 - 30°C) 0.16 µV/°C, (30 - 40°C) 0.18 µV/°C,

Measurement accuracy
Temperature

(simplified specifications, see temperature
accuracy graphs in VT1413C or
Agilent/HP E1313 manual for details)

Thermocouples

Type E

Type EEXtended

Range
±V FS

0.0039

0.0156

0.0625

0.25

* [SENSe:]FILTer[:LPASs][:STATe] ON (max scan rate - 100 rdgs/sec/channel)

(40 - 55°C) .39 µV

(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.

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.

A/D Filter -200 to 0°C 0 to 200°C 200 to 400°C 400 to 800°C

OFF

ON*

A/D Filter -200 to 0°C 0 to 200°C 200 to 800°C 800 to 1000°C

Linearity

% of reading

1.25°C

1.20°C

0.01

0.01

0.01

0.01

Offset Error

µV (10 Hz)

2.3

0.10°C

0.095°C

2.4

3.0

8.0

Noise µV

3 sigma

1.7

2.5

7.0
28

0.12°C

0.10°C

Noise µV*

3 sigma

1.4

2.2

5.7
23

0.125°C

0.11°C

Type J

Type K

Type R

OFF

ON*

A/D Filter -200 to 0°C 0 to 280°C 280 to 600°C 600 to 775°C

OFF

ON*

A/D Filter -200 to 0°C 0 to 375°C 375 to 800°C 800 to 1400°C

OFF

ON*

A/D Filter 0 to 100°C 100 to 200°C 200 to 600°C 600 to 1000°C

OFF

ON*

* [SENSe:]FILTer[:LPASs][:STATe] ON (max scan rate - 100 rdgs/sec/channel)

13.4°C

13.3°C

1.50°C

1.47°C

2.25°C

2.70°C

1.40°C

1.40°C

0.30°C

0.25°C

0.10°C

0.11°C

0.15°C

0.15°C

0.75°C

0.70°C

0.20°C

0.15°C

0.15°C

0.15°C

0.20°C

0.17°C

0.45°C

0.40°C

0.35°C

0.30°C

0.17°C

0.15°C

0.25°C

0.25°C

0.30°C

0.30°C

Specifications VT1509A Fixed Filter+Amplifier SCP 11

Measurement accuracy
Temperature (cont.)

Thermocouples (cont.)

(simplified specifications, see temperature accuracy graphs in VT1413C or Agilent/
HP E1313 manual for details)

Type S

Type T

5 kW Reference Thermistor

100 W Reference RTD

100 W RTD

A/D Filter 0 to 100°C 100 to 200°C 200 to 800 C 800 to 1750°C

OFF

ON*

A/D Filter -200 to -100°C -100 to 0°C 0 to 200°C 200 to 400°C

OFF

ON*

A/D Filter 45 to 65°C 65 to 85°C

OFF

ON*

A/D Filter -125 to 70°C

OFF
ON*

A/D Filter -200 to 75°C 75 to 300°C 300 to 600°C 600 to 970°C

OFF
ON*

2.85°C

2.85°C

1.35°C

1.35°C

0.0061°C

0.0055°C

0.080°C

0.080°C

0.08°C

0.07°C

1.35°C

1.80°C

0.25°C

0.22°C

0.011°C

0.010°C

0.21°C

0.18°C

0.70°C

0.65°C

0.10°C

0.10°C

0.27°C

0.25°C

0.65°C

0.55°C

0.15°C

0.13°C

0.37°C

0.35°C

2252 W Thermistor

5 kW Thermistor

10 kW Thermistor

A/D Filter 63 to 70°C 70 to 83°C 83 to 100°C

OFF
ON*

A/D Filter 15 to 30°C 30 to 70°C 70 to 85°C

OFF
ON*

A/D Filter 30 to 60°C 60 to 90°C 90 to 115°C

OFF
ON*

0.008°C

0.007°C

0.011°C

0.010°C

0.015°C

0.014°C

0.009°C

0.008°C

0.013°C

0.013°C

0.016°C

0.015°C

0.014°C

0.012°C

0.017°C

0.017°C

0.022°C

0.020°C

12 VT1509A Fixed Filter+Amplifier SCP Specifications