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1-12
1.5.6
Gate Time
Range:
200
F
S to 99.9 S
Resolution:
25.6
F
S
1.5.7
External Standard Input (Not Available with Option 11)
Frequency:
10 MHz
Level:
Min., 100 mV rms; Max., 10 V rms
Max. Input Level:
400V peak to 500 Hz, decreasing to 10V rms
at 30 kHz and above
Impedance:
1 Kilohm (nominal) for signals <1V p-p,
decreasing to 500 ohms (nominal) for signals
10V p-p and above. AC coupled.
Note: The external reference multiplier (Option 10) may be used to lock standard
frequencies that are subharmonics of 10 MHz.
1.5.8
External Arming
Applicability:
All functions, except phase, pulse width,
rise/fall time, can be armed.
Input Signal:
TTL, available from front panel BNC or 8
TTLTRGbus lines, selected under program
control.
Arming Mode
1. Start - Off
Stop - Off
2. Start - Positive
Stop - Off
3. Start - Negative
Stop - Off
4. Start - Positive
Stop - Positive
5. Start - Negative
Stop - Positive
6. Start - Positive
Stop - Negative
7. Start - Negative
Stop - Negative
NOTE: "OFF" state indicates the counter's internal arm/stop is used.
Minimum Start-Stop Arm Period:
100ns
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