Tektronix 2236 - Page 13

General Information -- 2236 Operators
Table
1-1
(
cont )
Performance
Requirements
O
П
П
1
n
Characteristics
Supplemental
Information
COUNTER -
TIMER
Frequency
Ranges
Maximum
Resolution
100 Hz
1 kHz
10 kHz
100 kHz
1 MHZ
10 MHz
100 MHz
0.00001 Hz
0.0001 Hz
0.001 Hz
0.01 Hz
0.1 Hz
1 Hz
10
Hz
Maximum
Input
Frequency
Same as trigger specifications .
0.20000 Hz .
Minimum
Displayable
Frequency
Time Base Error
Standard
+1 X
10-5
(
10
parts per
million
)
Less
than 5 X
10-6
change
per
year .
Option
14
+5 X 10-7 ( 0.5 parts per million . )
Less than 1 X
10-7 change
per month .
Nongated
Mode ( Hz )
П
n
in
n
П
Resolution Error
1.4 TJE
N
F2 + LSD
Accuracy Resolution
Error
+ (
TBE
) F
Gated
Mode
(
Hz
)
b
Resolution Error
/1.4 TJE
N.
Accuracy Resolution
Error +
Frequency
Gating Error
# ( TBE ) F .
Gating
Error
( 2 ns
Chansen
2
F
1 П
П
bReduces to + LSD for pulse inputs with transition times < 20 ns .
TJE
Trigger jitter error ( seconds ) .
F
Frequency of input ( Hz ) .
N
=
Number
of input
samples
accumulated =
F ( 0.25 second +0.01 second ) > 1 .
LSD = One
count in least
significant
digit .
TBE
Time base
error (
fractional ) .
Ng
Number of samples inside one gate interval > 1 .
C
1-7
1