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Racal Instruments Manuals
Timer
2251A
Operator's manual
Definitions And Notes - Racal Instruments 2251A Operator's Manual
Universal timer/counter
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Racal Instruments
2251A
Operator's Manual
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1.5.14.2
Option 11 0.1 ppm Internal Reference
Frequency
Accuracy
Warm-Up Time
Temperature Stability
Short Term Stability
Aging
Internal Reference Output
Single Sideband (SSB) Phase Noise
NOTE: Options 10 and 11 are mutually exclusive.
1.5.14.3
Option 41 1.3 GHz Input C
Factory installed option extending the counter range to 1.3 GHz.
Frequency Range:
(Refer to Sections 1.5.1 and 1.5.3.2 for additional specifications.)
1.6
Definitions and Notes
1.6.1
Trigger Error
Trigger Error =
where e = input amplifier rms noise (typically 150 FV, 450 FV max. in a 160 MHz
i
1-14
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coupled.
10 MHz
± 1 x10
To within 1x10 in <3 minutes
0.05 ppm, -10EC to 55EC
3 x 10 /second
# 0.1 ppm/year
1V
TTL/CMOS compatible
Voh
Vol
-115dBc/Hz @ 10 Hz
-145dBc/Hz @ 100 Hz
-150dBc/Hz @ 1KHz, 10KHz
40 MHz to 1.3 GHz
2
2
SQR ( e + e )
i
n
Input slew rate at trigger point
-8
-7
-11
nominal into 50S
rms
4.3V at -24 mA
min
0.44V at +24mA
max
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