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參數(shù)資料
| 型號(hào)： | ICM7216AlJl |
| 廠商： | Intersil Corporation |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:79; Series:MS27496; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:21; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:21-35 RoHS Compliant: No |
| 中文描述： | 8位數(shù)字，多功能，頻率計(jì)數(shù)器/定時(shí)器 |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大?。?/td> | 141K |
| 代理商： | ICM7216ALJL |
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9-21
Accuracy
In a Universal Counter crystal drift and quantization effects
cause errors. In
frequency, period
and
time interval
modes, a signal derived from the oscillator is used in either
the Reference Counter or Main Counter. Therefore, in
these modes an error in the oscillator frequency will cause
an identical error in the measurement. For instance, an
oscillator temperature coefficient of 20
PPM
/
o
C will cause a
measurement error of 20
PPM
/
o
C.
In addition, there is a quantization error inherent in any digital
measurement of
±
1 count. Clearly this error is reduced by dis-
playing more digits. In the
frequency
mode the maximum
accuracy is obtained with high frequency inputs and in
period
mode maximum accuracy is obtained with low frequency
inputs (as can be seen in Figure 14). In
time interval
mea-
surements there can be an error of 1 count per interval. As a
result there is the same inherent accuracy in all ranges as
shown in Figure 15. In
frequency ratio
measurement can be
more accurately obtained by averaging over more cycles of
INPUT B as shown in Figure 16.
FIGURE 14. MAXIMUM ACCURACY OF FREQUENCY AND
PERIOD MEASUREMENTS DUE TO LIMITATIONS
OF QUANTIZATION ERRORS
FIGURE 15. MAXIMUM ACCURACY OF TIME INTERVAL MEA-
SUREMENT DUE TO LIMITATIONS OF QUANTIZA-
TION ERRORS
FIGURE 16. MAXIMUM ACCURACY FOR FREQUENCY RATIO MEASUREMENT DUE TO LIMITATION OF QUANTIZATION ERRORS
FREQUENCY MEASURE
0
2
4
8
1
10
10
3
10
7
FREQUENCY (Hz)
M
6
0.01s
0.1s
S
10
5
10s
1s
PERIOD MEASURE
f
OSC
= 10MHz
1 CYCLE
10 CYCLES
10
2
CYCLES
10
3
CYCLES
MAXIMUM TIME INTERVAL
FOR 10
INTERVALS
MAXIMUM TIME
INTERVAL FOR
10
INTERVALS
MAXIMUM TIME INTERVAL
FOR 10 INTERVALS
10
3
TIME INTERVAL (
μ
s)
10
4
10
5
10
6
10
7
10
8
10
2
10
1
0
1
2
3
4
5
6
7
8
M
S
1 CYCLE
10 CYCLES
10
CYCLES
10
3
CYCLES
RANGE
10
3
10
4
f
A
/f
B
10
5
10
6
10
7
10
8
10
2
10
1
0
1
2
3
4
5
6
7
8
M
S
ICM7216A, ICM7216B, ICM7216D
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