Racal Instruments 2251A Operator's Manual page 15

Universal timer/counter
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Input C (Option 41)
Frequency Range:
Sensitivity (Sinewave):
Dynamic Range:
Input Impedance:
VSWR:
Maximum Operating Input:
Maximum Input Without Damage:
1.5.2 Trigger Conditions
Trigger Level Range:
Trigger Level Accuracy:
Autotrigger Minimum Amplitude:
Autotrigger Frequency Range:
1-6
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40 MHz to 1.3 GHz
25 mV rms to 1 GHz
50 mV rms to 1.3 GHz
40 dB to 1 GHz
50 ohms (nominal)
< 2:1 at 1GHz
1 V rms
7 V rms
Automatic or manual selection in the +5.1 V
to -5.1 V range (X1), +51 V to -51 V range
(X10)
X1: ± 5.1 V in 20 mV steps
X10:± 51 V in 200 mV steps
X1: ± 1% of Trigger Level + 30 mV
X10: ± 1% of Trigger Level + 300 mV
150 mV pp
DC, 50 Hz to 160 MHz (typically to 200MHz)

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