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INPUT SPECIFICATIONS
Input A
Input Coupling: AC or DC
Input Impedance: 1MW//25pF (DC or AC coupled), or 50W (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 (1MW, DC coupled)
< 30Hz to > 125MHz (1MW, AC coupled)
< 500kHz to > 125MHz (50W, AC coupled).
Sensitivity: Sinewave - 15mVrms 30Hz to 100MHz,
25mV to 125MHz at optimum threshold adjustment.
Signal Range: 1MW, DC - 0 to 3.3V (1:1) or 1 to 12V (5:1),
1MW, AC - up to 1Vrms (3Vpp) (1:1) or up to 4Vrms (12Vpp) (5:1)
50W, 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: 50W (AC coupled)
Frequency Range: <80mhz to="">3000MHz
Sensitivity: Sinewave - 25mVrms 2GHz to 6GHz
Signal Range: <0dbm recommended="" 13dbm="" 1vrms="" maximum="" br=""> Input C (TF960 only)
Input Impedance: 50W (AC coupled)
Frequency Range: <1800mhz to="">6000MHz
Sensitivity: Sinewave - 12mVrms 80MHz-2GHz,
25mV to 2.5GHz, 50mVrms to 3GHz
Signal Range: <0dbm recommended="" 13dbm="" 1vrms="" maximum="" br=""> External Reference
Input Impedance: >100kW, AC coupled
Frequency: 10MHz
Signal Level: TTL, 3Vpp to 5Vpp CMOS or 1 to 2Vrms sinewave
Maximum Input Voltage
Input A and Input B: 30Vdc; 30Vrms 50Hz/60Hz reducing to 1Vrms above 1MHz
Note that the inputs will not be damaged if subjected to an accidental short-term connection to a
50/60Hz line voltage not exceeding 250V rms.
MEASUREMENT FUNCTIONS
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 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.
TIMEBASE
Measurement Clock: 50MHz
Internal Reference: 10MHz TCXO with electronic calibration adjustment (> +/- 8ppm)
Temperature Stability: Better than ± 1ppm over rated temperature range
Initial Error: < ± 0.2ppm at 25ºC
Ageing Rate: <± 1ppm/year
OPERATING FACILITIES
Noise Filter
The Filter key controls a low pass filter, with a cut-off frequency of about 50kHz, to ensure
more stable readings at low frequencies.
