H Heuer Instruments UMDT51A, Руководство пользователя

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LT51 User Manual ix
Table of Contents
USER MANUAL
........................................................................................................I
WARRANTY ........................................................................................................II
SAFETY WARNINGS .........................................................................................III
CARE AND MAINTENANCE .............................................................................. V
Battery ................................................................................................... v
DC Power Supply.................................................................................. vi
Charging ............................................................................................... vi
Level of Charge .................................................................................... vi
SUPPLIED WITH THE LT51 ............................................................................. VII
SERVICE AND ADJUSTMENT ........................................................................ VII
ENVIRONMENTAL PROTECTION .................................................................. VII
DECLARATION OF CONFORMITY ................................................................ VIII
TABLE OF CONTENTS..................................................................................... IX
1. Product description .............................................................................1
2. Controls and connections ...................................................................3
Welcome screen ....................................................................................4
LCD ........................................................................................................5
Keypad ...................................................................................................6
Test lead connectors ..............................................................................8
Balanced Interfaces ...............................................................................8
Unbalanced Interfaces ...........................................................................8
USB port ................................................................................................9
DC power jack .......................................................................................9
Microphone and speaker .......................................................................9
Knob ......................................................................................................9
LEDs ......................................................................................................9
Battery cover ........................................................................................ 10
Numerical Keypad................................................................................ 10
3. Testing VF-PCM Multiplexers ........................................................... 11
Idle Channel Noise............................................................................... 11
Audio Level Setting .............................................................................. 12
Frequency Response ........................................................................... 13
Variation of Gain with input level .......................................................... 14
Signal to Quantization Noise ................................................................ 15
Cross-Talk ........................................................................................... 16
Ring Detect VAC / VDC when on-hook * ............................................. 17
VDC and IDC when off-hook, level measurement ............................... 18