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MEASUREMENT FUNCTIONS
Frequency (Range A)
Frequency Range:
Resolution:
Frequency (Range B)
Frequency Range:
Resolution:
Period (Range A only)
Period Range:
Resolution:
Measurement time
Selectable as 10s, 1s or 0.3s.
Resolution
The displayed resolution depends upon the measurement time and the input frequency. Eight or
nine digits are displayed for a 10 second measurement time. Six, seven or eight digits are displayed
for the shorter measurement times depending on input frequency. Usable resolution can be further
reduced by noise, especially at low frequencies.
Accuracy
Measurement accuracy is the sum of timebase accuracy and measurement resolution plus one
count.
TIMEBASE
Crystal Oscillator Frequency:
Initial Oscillator Adjustment Error:
Oscillator Temperature Coefficient:
Oscillator Ageing Rate:
OPERATING FUNCTIONS
Press to measure
With the power switch off, pressing any of the function select keys will power the instrument up in
the corresponding function. The instrument will automatically switch off 15 seconds after the last
key-press.
Hold
Pressing the Hold key will stop further measurements being made and the current measured value
will remain in the display, with the Hold indicator on, until the Hold key is pressed again.
Noise filter
The Filter key controls a low pass filter, with a cut-off frequency of about 50kHz, to ensure stable
readings at low frequencies.
2
3Hz to >125MHz
-7
10
Hz to 100Hz (see below)
80MHz to >3000MHz
1Hz to 10kHz (see below)
8ns to 330ms
-7
10
ns to 1us (see below)
10MHz
± 2ppm (closed-case adjustment by user)
Typically less than
± 0.3ppm/°C 18°C to 28°C,
± 10ppm –20°C to 70°C
<± 5ppm/year
Specification
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