HP 75000 B Series Manuale utente

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HP 75000 SERIES B and C

Eight-Channel

Fixed Filter and Amplifier

Signal Conditioning Plug-on

HP E1509

User’s Manual

The HP E1503 manual also applies to HP E1413Bs as HP E1413 Option 19.

Enclosed is the User’s Manual for the HP E1509 Signal Conditioning Plug-on. Insert

this manual in your HP E1413/E1313 manual behind the “Signal Conditioning

Plug-ons” divider.

Manual Part Number: E1509-90001 Printed: JANUARY 1996 Edition 1

Printed in U.S.A. E 019

*E1509-90001*

E1509-90001

HP E1509

Eight-Channel Fixed Filter and Amplifier

Signal Conditioning Plug-on

Introduction

The HP E1509 is a Signal Conditioning Plug-on that provides eight fixed

low-pass filters with a 3dB cutoff frequency of 7Hz and eight amplifiers

with gain of 64. 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 HP E1413/E1313 manual.

Identifying the Plug-on

You’ll find the HP part number on the connector side of the SCP to the left

of the serial number bar code. For the HP E1509, the part number is :

E1413-63519

Introduction HP E1509 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 HP E1413C and above Terminal Modules, use stickers for

HP E1509 SCPs. The connections are shown in Figure 1.

•For HP E1313 Terminal Moduless, use stickers for HP E1509 SCPs.

The connections are shown in Figures 2 and 3.

•For HP E1413B and below Terminal Modules, use stickers for

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

Figure 1 HP E1509 C-Size Terminal Module Connections

4 HP E1509 Fixed Filter+Amplifier SCP Connecting To The Terminal Module

Figure 2 HP E1509 B-size Terminal Module Connections (Ch 00-31)

Figure 3 HP E1509 B-size Terminal Module Connections (Ch 32-63)

Figure 4 HP E1413 Option 19 Terminal Module Connections

Connecting To The Terminal Module HP E1509 Fixed Filter+Amplifier SCP 5

Programming With SCPI Commands

The SCPI commands shown here are covered in Chapters 3 and 5 of your

HP E1413/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 the HP E1413/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 HP E1413B is:

HEWLETT-PACKARD,E1413 Opt 19 8-Channel Fixed Gain-Filter SCP,0,0

The value returned for the SCP in an HP E1313A/E1413C 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

Querying the Filter

Cutoff Frequency While the the HP E1509 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.

•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

Querying the

Filter State While the HP E1509 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.

6 HP E1509 Fixed Filter+Amplifier SCP Programming With SCPI Commands

•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 HP E1509’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

Detecting Open

Transducers 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.

Signal Conditioning Plug-on Multiplexer

Signal Input

High

Low

100M

-17V

Gnd.

100M

+17V

High

Low

Figure 5 Open Transducer Detect Circuit

Programming With SCPI Commands HP E1509 Fixed Filter+Amplifier SCP 7

NOTES 1) When OTD is enabled, the inputs have up to 0.2µA 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)

The register-based commands shown here are covered in Appendix D of the

HP E1413/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 HP E1509 Fixed Filter+Amplifier SCP Register Based Programming

HP E1509 Register Map

Read (returned value) Write( <

regvalue

>) SCP Register <

regaddr

> Value

SCP ID (902016) Whole SCP Reg 0 00ppp0000002

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

(SCP number)×4016

Then write the opcode for SCBREAD? (080016) to the Command Register.

The ID value will be returned to the Query Response Register.

Detecting Open

Transducers Open Transducer Detection (OTD) is controlled by bits in the Card Control

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.

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

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