HP 4934A Use and care manual

SERIAL NUMBERS
This manual applies directly to instruments
with serial numbers prefixed 3648U.
For additional important information about serial numbers,
see INSTRUMENTS COVERED BY MANUAL in Chapter 3.
HEWLETT®
PACKARD
HP Part No. 04934-90054
Printed in U.K.
November 1998
Copyright © Hewlett-Packard Ltd. 1998

HP 4934A Transmission impairment Measuring Set
and Accessories Supplied

The HP 4934A is a wideband (20 Hz to 110 kHz), (20 Hz to 200 kHz option 021) Transmission
Impairment Measuring Set (TIMS). The transmission impairment measurements which can be
made are listed below.
Level Frequency
Noise
Noise with Tone
Signal to Noise
Impulse Noise
P/AR (Peak to Average Ratio)
1 J Noise to Ground
J *;j The HP 4934A can make measurements directly on leased lines or on dial-up lines. It has loop
holding capability, a monitor speaker and butt-in connection (useful for talking to the far end of the
test line).
There are four permanently stored frequencies: 404 Hz, 1004 Hz, 2804 Hz and 2713 Hz. Any other
' * four frequencies may be temporarily assigned or stored by the user.
(: J The HP 4934A can test circuits using single frequency (SF) signaling - use the SF SKIP feature,
j , SF SKIP prevents the HP 4934A from transmitting signaling frequencies in the range
i i 2600 Hz+150 Hz.

Contents
1 Getting Started
Introduction 1-1
Switch-On 1-1
Front Panel Features 1-2
Demonstrating the HP 4934A 1 -5
Demonstration 1 1-5
Demonstration 2 1-6
Error Codes 1-7
2 Making Measurements
Preliminary Setup 2-1
Connecting the HP 4934A to the Test Circuit 2-1
Dial and Hold 2-2
Dialing using the HP 4934A and a Bott-in 2-3
Receiving an Incoming Call and Holding the Line 2-4
Level and Frequency 2-5
Principles 2-5
Instrument Operation 2-7
Message Circuit Noise 2-10
Principles 2-10
How it is Measured 2-11
Instrument Operation 2-12
Noise with Tone (Notched Noise) 2-13
Principles 2-13
How it is Measured 2-13
Instrument Operation 2-14
Signal to Noise 2-15
Principles 2-15
How it is Measured 2-15
hi

Contents
Instrument Operation 2-16
Impulse Noise 2-17
Principles 2-17
Instrument Operation 2-18
P/AR (Peak to Average Ratio) 2-21
Principles 2-21
How it is Measured 2-22
Instrument Operation 2-22
Noise to Ground 2-23
Principles 2-23
How it is Measured 2-23
Instrument Operation 2-24
3 General Information
Introduction 3-1
About this Version 3-1
Specification 3-2
Safety Information 3-2
General 3-2
Safety Symbols 3-3
Statement of Compliance 3-5
Electromagnetic Compatibility (EMC) Information 3-5
Instruments Covered by Manual 3-7
Options Available 3-8
Accessories Supplied 3-9
Accessories Available 3-9
Specifications 3-10
IV

Contents
4 Installation
Introduction 4-1
Initial Inspection 4-1
Preparation for Use 4-2
Power Requirements 4-2
Line Fuse 4-2
Power Cable 4-3
Battery (Option 001 or Retrofit) 4-3
Battery 4-3
Mating Connectors (Front Panel) 4-4
Operating Environment 4-4
Cleaning 4-4
Noise Declaration 4-5
Storage and Shipment 4-5
Environment 4-5
Packaging 4-5
5 Performance Tests
Introduction 5-1
Calibration Cycle 5-1
Recommended Test Equipment 5-2
Operational Verification 5-3
Receiver Frequency 5-4
Receiver Level 5-5
Weighting Filters 5-6
Impulse Noise Count 5-9
Loss of Holding Tone 5~10
Hold Circuit 5-11
Dynamic Hold Circuit 5-13
Performance Tests 5-18

Contents
Transmitter Frequency Accuracy 5-19
Transmitter Level Range 5-20
Transmitter Level Accuracy 5 -21
Transmitter Flatness at +10 dBm 5-22
Transmitter Flatness at -40 dBm 5-24
Receiver Frequency Range/Accuracy 5-30
Receiver Level Accuracy 5-32
Message Circuit Noise Accuracy 5-34
Notch Filter Rejection 5-36
Signal to Noise Ratio Accuracy 5-37
Impulse Noise Threshold Accuracy 5-39
Noise to Ground Accuracy 5-41
Peak to Average Ratio (P/AR) Accuracy 5-43
6 Software Downloading
Introduction 6-1
Quick Download Procedure 6-2
About the DOWNLOAD Program 6-3
7 Remote Control
Introduction 7-1
The Serial Port 7~2
Serial Port Type 7-2
Baud Rates 7-2
Cable Pinout 7-3
Null Modem 7-3
Setting up for Remote Control 7-4
Connecting the TIMS to a Controller 7-4
VI

Contents
Setting the Baud Rate 7-4
Activating Remote Mode 7-4
Deactivating Remote Mode 7-4
Control Commands 1-5
Query Commands 7-8
Results Display (DISP?) Format 7-8
Range Error Messages 7-9
A Service Accessory 1 (SAl)
20 dB Amplifier/4 kHz Filter
Performance Test A-1
B Service Accessory 2 (SA2)
Power Splitter/Adder
Performance Test B-1

Contents