BNC 1105 Universal Counter - Manual (Page 96)

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+25 dBm DC ±12V
External Arm Input Specifications
Signal Input Range LVTTL and TTL compatible
Timing Restrictions
Pulse Width > 50 ns
Transition Time < 250 ns
Start-to-Stop Time > 50 ns
Damage Level 12 Vrms
External Arm Input Characteristics
Impedance 1 kΩ
Input Capacitance 17 pF
Start Slope Positive or Negative
Stop Slope Positive or Negative
Notes
1. External Arm is available for all measurements except Peak Volts.
2. External Arm is referred to as External Gate for some measurements.
Internal Time Base Stability
Standard
(0° to 50°C)
High Stability Oven
(1105-opt01)
Temperature Stability
(referenced to 25°C)
± 1 x 10E-6 ± 5 x 10E-9
Aging Rate
Per Day
Per Month
Per Year
± 0.2 x 10E-6 (Typical)
± 1 x 10E-6 (Typical)
± 8 x 10E-10
± 8 x 10E-8
Turn-on stability vs. time (30
min.)
± 2.0 x 10E-8
(refer to 24 hours)
Calibration Electronic Electronic
External Time Base Input Specifications
Voltage Range 200 mVrms to 10 Vrms
Damage Level 12 Vrms
External Time Base Input Characteristics
Threshold 0 V
Impedance 1 kΩ
Input Capacitance 25 pF
Input Frequency 10 MHz
Internal vs. External Time
Base Selection
Manual Select Internal or External
Automatic Internal used when External not present (default)
Time Base Output Specifications
Output Frequency 10 MHz
Voltage 570 mVpp (0 dBm), typical
Impedance 50 Ω (typical), AC coupled
Measurement Specifications
Frequency, Period 1 mHz to 400 MHz (2.5 ns to 1000 s)