•0.001Hz to > 3000MHz or 6000MHz frequency range
•Frequency, period, pulse width, duty cycle, frequency ratio and event counting modes
•High performance temperature compensated timebase
•Reciprocal measurement technique gives superior resolution
•High input sensitivity over the full frequency range
•High impedance DC coupled input up to 125MHz
•Variable trigger threshold and switchable attenuator
•Large 10 digit LCD display with annunciators
•Operation from built-in rechargeable batteries
•Low power consumption gives up to 24 hours operation
•Remote control and readback via USB interface

Specifications:

1-Input:
-Input A:
•Input Coupling: AC or DC
•Input Impedance: 1Mohm//25pF (DC or AC coupled), or 50ohm (AC coupled only)
•Attenuation: 1:1 or 5:1
•Active Edge: Rising or falling, or width high or low
•Low Pass Filter: 50kHz cut-off, or None
•Frequency Range:
0.001Hz to > 125MHz (1Mohm, DC coupled)
< 30Hz to > 125MHz (1Mohm, AC coupled)
< 500kHz to > 125MHz (50ohm, AC coupled).
•Sensitivity: Sinewave - 15mVrms 30Hz to 100MHz, 25mV to 125MHz at optimum threshold adjustment.
•Signal Range:
1Mohm, DC - 0 to 3.3V (1:1) or 1 to 12V (5:1)
1Mohm, AC - up to 1Vrms (3Vpp) (1:1) or up to 4Vrms (12Vpp) (5:1)
50ohm, AC - up to 1V rms above 300kHz
•Trigger Threshold:
DC coupled - 0 to 2V (1:1) or 0 to 10V (5:1)
AC coupled - Average ± 200mV (1:1) or ± 1V (5:1)
-Input B:
•Input Impedance: 50ohm (AC coupled)
•Frequency Range: <80MHz to >3000MHz
•Sensitivity: Sinewave - 25mVrms 2GHz to 6GHz
•Signal Range: <0dBm recommended, 13dBm (1Vrms) maximum
- Maximum Input Voltage: Input A and Input B: 30Vdc; 30Vrms 50Hz/60Hz reducing to 1Vrms above 1MHz

2-Measurement:
-Frequency:
•A Input Range: 0.001Hz (DC coupled) to >125MHz
•B Input Range: 80MHz to >3000MHz
•Resolution: up to 10 digits (see Note) or 0.001Hz
-Period:
•A Input Range: 8ns to 100s (DC coupled)
•B Input Range: 333ps to 12.5ns
•Resolution: up to 10 digits (see Note)
-Pulse Width Mode (Input A only):
•Functions: Width high, width low, ratio H:L (high time to low time) and duty cycle
•Pulse Width Range: 40ns to 1000s
•Averaging: Automatic within measurement time selected, up to 50 pulses
•Resolution: 20ns for one pulse; up to 1ns or 10 digits with multiple pulse averaging 0.01% for Ratio H:L and Duty Cycle,
-Total Count (Input A only):
•Count Range: 1 to 9 999 999 999
•Minimum Width: 8ns
-Frequency Ratio B:A:
•Resolution: Equal to the resolution of the two frequency measurements,
If the ratio exceeds 10 digits, 6 digits and the exponent are displayed
-Measurement Time: Selectable as 100s, 10s, 1s or 0.3s. The instrument displays the average value of the input signal over the measurement time selected, updated every 2s, 1s, 0.5s or 0.3s respectively. The hardware captures the count values and continues measuring without any dead time.
-Resolution: The displayed resolution depends upon measurement time and input frequency. The basic resolution of the period is 8 digits for every 2 seconds of measurement time. Frequency resolution is the reciprocal of period resolution. Usable resolution can be reduced by noise at low frequencies.
-Accuracy: Measurement accuracy is timebase accuracy measurement resolution 2 counts