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Model:
7250A
Data:
1978
Kategoria:
Grupa:
Opis:
Universal Counter Timer
Informacja
1-2. The Model 7250A is a Universal Counter-Timer capable of
measurements in seven modes of operation: frequency (Channel
A, 5 Hz to 80 MHz), period and period averaging (Channel A,
5 Hz to 1 MHz), time interval (Channel A to Channel B, 5 Hz
to 2 MHz), counts per minute (Channel A, 5 Hz to 80 MHz),
ratio of Channel A (5 Hz to 80 MHz) divided by Channel B(5
Hz to 1 MHz), and totalize Channel A (5 Hz to 80 MHz). In
addition, Self Check mode is-provided to demonstrate
operability of most 7250A circuits.
1-3. This manual documents the 7250A Universal Counter-Timer
under two categories. The standard instrument without
options and Accessories is covered in Sections 1 through 5,
7 and 8. All optional or accessory items are documented in
Section 6; refer to Table 1-1 and
1-2 for a listing of available options and Accessories.
Schematic diagrams for the standard instrument and the
options are centralized in Section 8.
1-4. DESCRIPTION
1-5. The Model 7250A is a seven-digit universal
counter-timer capable of measurements in frequency, period,
period average, time interval, totalize, ratio, and self
check mode. In addition, counts per minute mode
offers a direct readout of RPM when the instrument is
attached to an appropriate transducer. The 7250A features
six manually selected resolution settings, autoranging,
leading zero suppression, full annunciation, autoreset, and
a free-air crystal time base.
1-6. Each of the two 1 Mfl input channels is controlled by a
± slope control and a three position trigger level offset
switch. Separate attenuation controls (continuously variable
from X1 to X100) are provided for each input. A 100 kHz low
pass Filter can be applied to both channels. Channel A can
be measured in common with, or separately from, Channel B.
Input frequencies on Channel A can range from 5 Hz to 80
MHz. Channel B, when used in ratio and time interval
measurements, has a maximum input of 2 MHz.
1-7. A number of options and Accessories are available with
the instrument. Improved time base stability can be realized
with the optional TCXO, or with one of the oven time bases.
Typ ręczny:
Serwis i User Manual
Strony:
150
Rozmiar:
6.09 Mbytes (6381669 Bytes)
Język:
english
Rewizja:
Ręczny ID:
P/N 487496
Data:
1978 12 01
Jakość:
Skanowany dokument, czytając częściowo źle, nie częściowo czytelny.
Data przesłania:
2017 04 30
MD5:
6b3a2e4ba0ec9eab84646c1ee4d67683
Pobrane:
972
Informacja
Instruction Manual
1 INTRODUCTION AND SPECIFICATIONS
... 1-1
I-l. INTRODUCTION
... 1-1
1-4. DESCRIPTION
... I-l
lr8. SPECIFICATIONS
... 1-1
2 OPERATING INSTRUCTIONS
... 2-1
2-1. INTRODUCTION
... 2-1
2-3. SHIPPING INFORMATION
... 2-1
2-5.
INSTALLATION ... 2-1
2-6. Input Power
... 2-1
2-B. Instrument Case Mating
... 2-1
2-11. Tilt-Down Baü
... 2-2
2-13. Rack Installation
... 2-2
2-15. OPERATING FEATURES
... 2-2
2-17. OPERATION NOTES
... 2-2
2-19. AC Line Connection
... 2-5
2-21. Maximum Inputs
... 2-5
2-23. Counter/Timer Terminology
... 2-5
2-64. Function Control
... 2-8
2-66. Resolution
Control ... 2-8
2-70. Separate/Common Control
... 2-8
2-72. Attenuation
Control ... 2-9
2-74. Slope Control
... 2-9
2-76. Filter Control
... 2-9
2-78. Offset Control
... 2-9
2-80. Display
... 2-9
2-83. Accuracy
... 2-10
2-85. Dealing with One Count Error
... 2-10
2-87. Reducing Time Base Error
... 2-II
2-89. Trigger Error Considerations
... 2-11
2-91. Reducing Errors due to Noise on the Input Signal
... 2-11
2-93. Summary
... 2-12
2-95. OPERATING DIRECTIONS
... 2-12
2-97. Initial
Procedure ... 2-12
2-99. Frequency Measurements (FREQ A)
... 2-12
2-101. Counts Per Minute Measurements (CPM X100A)
... 2-12
2-103. Ratio Measurements (RATIO A/B)
... 2-13
2-107. Period Measurements (PER A)
... 2-13
2-110. Period Averging Measurements (PER AVG A)
... 2-14
2-112. Time Interval Measurements (TI A-B)
... 2-14
2-118. Totalizing Measurements (TOT A)
... 2-15
2-120. Self-Check (CHK)
... 2-15
3 THEORY OF OPERATION
... 3-1
3-1. INTRODUCTION
... 3-1
3-3. FUNCTIONAL DESCRIPTION
... 3-1
3-5. Frequency (FREQ A) Measurements
... 3-2
3-8. Period (PER A) Measurements
... 3-2
3-11. Period Averaging (PER AVG A) Measurement
... 3-3
3-14. Counts Per Minute (CPM X100A)
Measurement ... 3-4
3-17. Ratio (RATIO A/B)
... 3-5-
3-19. Totalize (TOT A)
... 3-5
3-21. Time Interval (TI A-B)
... 3-6
3-23. Self-Check (CHK)
... 3-6
3-25. CIRCUIT ANALYSIS
... 3-6
3-27. Power supply
... 3-6
3-29. Time Base
... 3-7
3-31. Input Circuitry
... 3-7
3-34. Function Logic
... 3-7
3-37. Resolution Logic
... , ... 3-8
3-41. Control Logic
... 3-9
3-46. Main Gate Clocking Logic
... 3-10
3-48. Main Gate Enable Logic
... 3-10
3-51. Count Circuits
... 3-11
3-54. Display
... 3-12
3-56. Time Interval Logic
... 3-12
3-59. Reset Logic
... 3-13
3-61. Remote Logic
... 3-13
4 MAINTENANCE
... 4-1
4-1. INTRODUCTION
... 4-1
4-3. SERVICE INFORMATION
... 4-1
4-6. GENERAL
MAINTENANCE ... 4-1
4-7.
Disassembly ... 4-1
4-9. Reassembly
... 4-3
4-11. Input Power
... 4-3
4-13. Fuse Replacement
... 4-3
4-16. Cleaning
... 4-3
4-18. PERFORMANCE TEST
... 4-4
4-20. Equipment Preparation
... 4-4
4-22. Time Base Accuracy Test
... ; ... 4-4
4-24. Sensitivity Test, Channel A
... 4-5
4-26. Sensitivity Test, Channel B
... 4-5
4-28. Display Test
... 4-6
4-30. Frequency A Test
... 4-6
4-32. Counts Per Minute Test
... 4-7
4-34. Ratio Test
... 4-8
4-36. Period Test
... 4-8
4-38. Period Average
Test ... 4-8
4-40. Time Interval Test
... 4-8
4-42. Totalize Test
... 4-8
4-44. Self-Check
Test ... : ... 4-9
4-46. CALIBRATION
... 4-9
4-48. Time Base Calibration
... 4-9
4-50. Coarse Time Base Adjustment
... 4-9
4-52. Channel A Trigger Level Adjustment
... 4-10
4-54. Channel B Trigger Level Adjustment
... 4-10
4-56. SELECTED COMPONENT REPLACEMENT ... 4-10
4-58. TROUBLESHOOTING
... 4-10
4-63. Static Discharge Precautions
... 4-11
5 LIST OF REPLACEABLE PARTS
... 5-1
TABLE OF CONTENTS ... 5-1
5-1. INTRODUCTION
... - ... 5-2
5-4. HOW TO OBTAIN PARTS
... 5-4
6 OPTION AND ACCESSORY INFORMATION
... 6-1
TABLE OF CONTENTS ... 6-1
7 GENERAL INFORMATION
... 7-1 7A MANUAL
CHANGE INFORMATION ...
7A-1 8 SCHEMATIC DIAGRAMS
... 8-1
TABLE OF CONTENTS ... 8-1