Agilent Technologies HP E1750A User manual

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Errata
Title & Document Type: E1750A Broadband Distribution Amplifier User’s Guide
Manual Part Number: E1750-90001
Revision Date: July 1993
About this Manual
We’ve added this manual to the Agilent website in an effort to help you support your
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businesses are now part of Agilent Technologies. The HP XXXX referred to in this document is
now the Agilent XXXX. For example, model number HP8648A is now model number Agilent
8648A. We have made no changes to this manual copy.
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User’s Guide
Enclosed is the User’s Guide for the HP E1750A Broadband Distribution
Amplifier. Insert this guide, plus any other VXIbus guides (or manuals) that you
have, into the binder that came with your Hewlett-Packard mainframe.
HP 75000 SERIES C
HP E1750A Broadband Distribution
Amplifier
barcode goes here

User’s Guide
This guide describes how to use the HP E1750A Broadband Distribution
Amplifier. The information in this guide applies to instruments having the
number prefix listed below, unless accompanied by a "Manual Updating
Changes" package indicating otherwise.
SERIAL PREFIX NUMBER: 3325 and above
HP 75000 SERIES C
HP E1750A Broadband Distribution
Amplifier

Contents
Contents
1 Using the HP E1750A
HP E1750A Faceplate Features 1-3
How the HP E1750A Works 1-5
Warnings and Cautions 1-6
Setting the Address Switch 1-7
Selecting the Interrupt Priority 1-8
Installing and Removing the HP E1750A 1-10
To Install the Module 1-10
To Remove the Module 1-10
Operation Check 1-12
Equipment 1-12
Procedure 1-13
Status Register Check 1-14
Short Outputs Test 1-14
Performance Verification 1-15
Phase Noise Test 1-15
Test Record 1-15
Input Frequency Response Test 1-17
Specifications Tested 1-17
HP E1750A Input Ranges 1-17
HP E1750A Outputs, 50Ωload 1-17
Equipment 1-17
Procedure 1-18
Input Level Response Test 1-19
Specifications Tested 1-19
HP E1750A Input Ranges 1-19
HP E1750A Outputs, 50Ωload 1-19
Equipment 1-19
Procedure 1-20
Harmonic Distortion and Spurious Signals Tests 1-21
Specification Tested 1-21
HP E1750A Outputs, 50Ωload 1-21
Test Equipment 1-21
Procedure 1-22
HP E1750A Performance Test Record 1-25
2 Programming the HP E1750A
About this Chapter 2-2
v

Contents
vi
Programming Overview 2-2
Command Types 2-3
Common Command Format 2-3
SCPI Subsystem Command Format 2-3
Command Separator 2-3
Abbreviated Commands 2-4
Parameters 2-4
Optional Parameters 2-4
Linking Commands 2-5
HP E1750A SCPI Status Reporting Structure 2-6
Standard Byte Group 2-7
Questionable Data Group 2-8
Standard Event Group 2-8
Operation Status Group 2-9
Register-Based Programming 2-10
Addressing the Registers 2-10
The Base Address 2-12
A16 Address Space Outside the Command Module 2-12
A16 Address Space Inside the Command Module or Mainframe 2-12
Register Descriptions 2-13
ID Registers 2-13
Device Type Registers 2-13
Status Register 2-13
Programming Examples 2-14
BASIC / UX Interrupt 2-14
BASIC / UX Register Programming Example 2-16
C Program Interrupt Example 2-17
C Register Programming Example 2-20
C-SCPI Programming Interrupt Example 2-22
3 SCPI Command Reference
About this Chapter 3-2
DIAGnostic:INPut? 3-4
DIAGnostic:OUTput[<output_channel>]? 3-5
STATus:OPERation:CONDition? 3-7
STATus:OPERation:ENABle <number> 3-8
Query Syntax 3-8
STATus:OPERation[:EVENt]? 3-9
STATus:PRESet 3-10

Contents
vii
STATus:QUEStionable:CONDition? 3-11
Questionable Condition Register Bit Definitions 3-11
STATus:QUEStionable:ENABle <number> 3-12
Questionable Event Enable Register Bit Definitions 3-12
Query Syntax 3-12
SYSTem:ERRor? 3-13
SYSTem:VERSion? 3-14
4 Error Messages
Error Messages 4-2
5 Specifications
Specifications 5-2
HP E1750A Input Ranges 5-2
HP E1750A Outputs, 50Ωload 5-2
Supplemental Characteristics 5-3
Outputs 5-3
Power Requirements 5-3
Index

Contents
viii

1
Using the HP E1750A
•HP E1750A Faceplate Features
•How the HP E1750A Works
•Setting the Address and Interrupt Priority Switches
•Installing and Removing the HP E1750A
•Operation Check
•Performance Test Recor
d

Using the HP E1750A
HP E1750A Faceplate Features
Figure 1-1. HP E1750A Faceplate
1-2

Using the HP E1750A
HP E1750A Faceplate Features
HP E1750A Faceplate Features
These are the descriptions of the numbered features in Figure 1-1.
1Input LED. Lights when a 100 kHz to 10 MHz sinusoidal signal is applied.
Input power of +7 to +19 dBm is recommended.
2INPUT connector. BNC (female)
3Output LEDs. Lights when a 100 kHz to 10 MHz sinusoidal output signal is
present.
4Output connectors. BNC (female)
Figure 1-2. HP E1750A Block
Diagram
1-3

Using the HP E1750A
How the HP E1750A Works
1-4
How the HP E1750A Works
Refer to Figure 1-2 when reading the following explanation.
A sinusoidal signal at a frequency of 100 kHz to 10 MHz with a power level of
+7 to +19 dBm is applied to the input. A 50 ohm resistor across the input
establishes a nominal 50 ohm input impedance.
The input signal is processed by an Automatic Gain Control (AGC) loop to
produce a constant amplitude signal (Vleveled) at the output of the wideband
amplifier. The AGC loop consists of a resistive input attenuator, a wideband
amplifier, a precision level detector, a voltage reference (which sets the Vleveled
level), an integrating amplifier, and a LED/photoconductor unit. The
photoconductor section forms part of the input attenuator. To maintain Vleveled
constant as the input power varies, the AGC loop forces the photoconductor
resistance to change inversely to the input voltage level. The result is that larger
input signal are attenuated more, and smaller input signals are attenuated less.
The faceplate LEDs indicate the presence of the input signal and each of the
output signals. The fault logic circuit, in response to the peak detector circuits
indicating a loss on the input and one or more of the outputs, sends a fault flag to
the VXI interface circuit. This, in turn issues an interrupt request to the VXI bus.
The status of the input and output signals can be read over the VXI bus at the
discretion of the VXI bus controller or in response to a fault interrupt request of
the HP E1750A.

Using the HP E1750A
Warnings and Cautions
Warnings and Cautions
SHOCK HAZARD. ONLY SERVICE-TRAINED PERSONNEL WHO
ARE AWARE OF THE HAZARDS INVOLVED SHOULD INSTALL,
REMOVE, OR CONFIGURE THE HP E1750A. BEFORE YOU REMOVE
ANY INSTALLED MODULE, DISCONNECT AC POWER FROM THE
MAINFRAME AND FROM OTHER MODULES THAT MAY BE
CONNECTED TO THE HP E1750A.
WARNING
CAUTION MAXIMUM INPUTS. The maximum voltage that can be applied to the
faceplate INPUT terminal is 5 Vrms (+27 dBm) ±40 Vdc.
Always check that the mainframe power is OFF before installing or
removing any board or instruments into the backplane connectors.
STATIC ELECTRICITY. Static electricity is a major cause of component
failure. To prevent damage to the electrical components in the HP E1750A,
observe anti-static techniques whenever removing a module from the
mainframe or whenever working on a module.
1-5

Using the HP E1750A
Setting the Address Switch
Setting the Address Switch
The HP E1750A logical address switch (LADDR) factory setting is 8. You may
have changed the setting during module installation. Valid address values are
from 1 to 255. If the HP E1750A is used with an
HP E1406A Command Module in a C-Size Mainframe, refer to the "HP E1406A
Command Module User's Guide" for addressing information. Otherwise, use
Figure 1-3 to set the logical address switch.
The address switch selected value must be a multiple of 8 if the module is used
with a VXIbus Command Module, and being instructed by SCPI commands.
NOTE
Figure 1-3. Logical Address Switch
1-6

Using the HP E1750A
Selecting the Interrupt Priority
Selecting the Interrupt Priority
The HP E1750A module generates an interrupt when the status register
transitions from a valid signal condition on both the input and six outputs to an
invalid signal condition. These interrupts are sent to, and acknowledgments are
received from, the HP E1406A Command Module via the VXIbus backplane
interrupt lines.
For most applications where the HP E1750A module is installed in an HP 75000
Series C mainframe, the interrupt priority jumper does not have to be moved.
This is because the VXIbus interrupt lines have the same priority, and interrupt
priority is established by installing modules in slots numerically closest to the
HP E1406A Command Module. Thus, Slot 1 has a higher priority than Slot 2;
Slot 2 has a higher priority than Slot 3, etc.
Refer to Figure 1-4 to change the interrupt priority. You can select seven
different interrupt priority levels. Level 1 is the lowest priority and Level 7 is the
highest priority. The Module's factory setting is Level 1. To change, remove
both 2-pin jumpers from the old priority locations and reinstall in the new
priority locations The two jumper locations must have the same interrupt priority
level selected.
The interrupt priority jumper should be installed in position 1 when using the
HP E1406A Command Module. Changing the priority level jumper is not
recommended. Do not change unless specifically instructed to do so.
NOTE
1-7

Using the HP E1750A
Selecting the Interrupt Priority
1-8
Figure 1-4. Interrupt Jumpers

Using the HP E1750A
Installing and Removing the HP E1750A
Installing and Removing the HP E1750A
The HP E1750A can be installed in any "C" mainframe Slot except Slot 0. The
HP E1406A Command Module should be installed in
Slot 0.
To Install the Module
Always check that the mainframe power is OFF before installing or
removing any board or instruments into the backplane connectors.
CAUTION
1Inspect the pins on the back of the module for straightness before inserting into
the mainframe.
2Install the module by lining up the module with the Slot guides and then pressing
the module firmly into the backplane connectors. See Figure 1-5.
The screws located at the top and bottom of the module can be used to secure the
installed module to the mainframe.
NOTE
To Remove the Module
CAUTION Always check that the mainframe power is OFF before installing or
removing any board or instruments into the backplane connectors.
Remove the captive screws. Remove the module by using the faceplate thumb
tabs as shown in Figure 1-5. This extracts the module from the backplane
connectors, allowing the module to be removed.
1-9

Using the HP E1750A
Installing and Removing the HP E1750A
Figure 1-5. Installing/Removing the HP E1750A
1-10

Using the HP E1750A
Operation Check
Operation Check
The purpose of these procedures is to check for functionality of the
HP E1750A. To verify the specifications given in Chapter 5, see "Performance
Verification" in this chapter.
The following procedures assume you have followed the instructions for
selecting the address and priority interrupts in the first part of this chapter and
have installed the HP E1750A into an appropriate "C" mainframe with the
HP E1406A Command Module installed into
Slot 0.
Figure 1-6. Operation Check Setup
Equipment
•Signal Generator: HP 8663A
•Oscilloscope: HP 54503A
•BNC Short
CAUTION Input amplitude at the HP E1750A INPUT must be below 5Vrms (+27 dBm)
or damage to the Amplifier will occur.
1-11

Using the HP E1750A
Operation Check
Procedure
1Apply power to the mainframe.
2Set the Signal Generator to the following conditions:
Frequency: 10 MHz
Wave type: Sinusoidal
Amplitude: +10 dBm
3Connect the equipment as shown in Figure 1-6 with the Signal Generator
connected to the HP E1750A input.
NOTE Once your HP E1750A Broadband Distribution Amplifier is installed and the
VXI mainframe power is ON, all that is required for operation is a signal to the
HP E1750A input.
4Verify that the input and all six output LEDs are lit.
5Set the oscilloscope to the following:
Channel 1: 0.5 V/div
Timebase: 50 ns/div
Input Impedance: 50 ohms
6Connect the oscilloscope to each of the output ports to verify that the output
signal is a 1 Vrms (2.8 Vp-p) sinewave at 10 MHz.
7Disconnect the signal from the HP E1750A INPUT.
8Verify all the LEDs are off. This indicates loss of input.
1-12