GENERAL INFORMATION ....................1-VIII
About this Manual ............................1-VIII
Warranty ..........................................1-VIII
Declaration of Conformity...................1-VIII
Preface.............................................. 1-2
Introduction ...............................................1-2
Powerful and Versatile Functions........1-2
No Mistakes........................................1-3
Design Innovations....................................1-3
State of the Art Technology Gives
Durable Use........................................1-3
High Resolution...................................1-3
Remote Control.........................................1-4
Fast GPIB Bus ....................................1-4
Safety................................................ 1-5
Introduction ...............................................1-5
Safety Precautions....................................1-5
Caution and Warning Statements........1-6
Symbols..............................................1-6
If in Doubt about Safety.......................1-6
Disposal of Hazardous Materials.........1-6
Unpacking ........................................ 1-7
Check List .................................................1-7
Identification..............................................1-7
Installation.................................................1-8
Supply Voltage....................................1-8
Battery Supply.....................................1-8
Grounding............................................1-8
Orientation and Cooling ......................1-8
Fold-Down Support .............................1-9
Rackmount Adapter ............................1-9
2 Using the Controls
Basic Controls...........................................2-2
Secondary Controls...................................2-4
Connectors & Indicators......................2-4
Rear Panel..........................................2-5
Rear Panel (CNT-91R/71B).................2-6
Description of Keys ...................................2-7
Power .................................................2-7
Select Function ...................................2-7
Autoset/Preset ....................................2-8
Move Cursor .......................................2-8
Display Contrast..................................2-8
Enter...................................................2-8
Save & Exit .........................................2-8
Don't Save & Exit................................ 2-8
Presentation Modes............................ 2-9
Entering Numeric Values .................. 2-10
Hard Menu Keys............................... 2-10
Default Settings ....................................... 2-19
3 Input Signal Conditioning
Input Amplifier............................................ 3-2
Impedance ......................................... 3-2
Attenuation......................................... 3-2
Coupling............................................. 3-3
Filter................................................... 3-3
Man/Auto............................................ 3-4
Trig..................................................... 3-5
How to Reduce or Ignore Noise and
Interference ........................................... 3-6
Trigger Hysteresis .............................. 3-6
How to use Trigger Level Setting........ 3-7
4 Measuring Functions
Introduction to This Chapter........... 4-2
Selecting Function .................................... 4-2
Frequency Measurements .............. 4-3
FREQ A, B................................................ 4-3
FREQ C.................................................... 4-4
CNT-90/91(R)..................................... 4-4
CNT-90XL .......................................... 4-4
RATIO A/B, B/A, C/A, C/B ........................ 4-4
BURST A, B, C......................................... 4-4
1-8
Triggering........................................... 4-4
Burst Measurements using Manual
Presetting........................................... 4-5
Frequency Modulated Signals................... 4-6
Carrier Wave Frequency f
0
................. 4-6
f
max
.................................................... 4-7
f
min
..................................................... 4-7
Δf
p-p
.................................................... 4-8
Errors in f
max
, f
min
, and Δf
p-p
.................. 4-8
AM Signals ............................................... 4-8
Carrier Wave Frequency..................... 4-8
Modulating Frequency ........................ 4-9
Theory of Measurement............................ 4-9
Reciprocal Counting ........................... 4-9
Sample-Hold..................................... 4-10
Time-Out .......................................... 4-10
Measuring Speed ............................. 4-10
PERIOD.................................................. 4-13
Single A, B & Avg. A, B, C................ 4-13
III
Environmental Considerations.............1-6
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