Brand : TTI - Thurlby Thandar Instruments
Manufacturer Ref. : PFM3000
Order Ref. : PFM3000
Weight : 0.7 kg
Thurlby Thandar PFM3000
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Wide frequency range and high resolution
The PFM3000 offers high sensitivity frequency measurement from 3Hz up to
3GHz in two overlapping ranges. Period measurement is also provided from 8ns to
330ms.
The PFM3000 uses a continuous reciprocal measurement technique to provide
high resolution at all frequencies with rapid update.
It offers high sensitivity across the whole frequency range. A low pass
filter can be selected to reduce high frequency signal noise at lower
frequencies.
A Large and clear display
Despite its compact dimensions, the PFM3000 incorporates a surprisingly
large 8 digit LCD.
Annunciators are provided for measurement function, measurement time,
overflow, trigger activity, low battery, and measurement units. |
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Low power consumption and push-to-measure
Despite its wide frequency range the PFM3000 has a power
consumption that enables it to operate for many hours from a PP3
size battery.
A push-to-measure capability gives a virtually instantaneous
reading followed by an automatic power down after 15 seconds.
This provides greatly extended battery life where continuous
monitoring of the signal is not required.
Bench-top use
The PFM3000
has the performance needed for many bench-top applications, and
its built-in tilt stand sets the display at a convenient angle. |
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MEASUREMENT FUNCTIONS
Frequency (Range A)
Frequency Range: 3Hz to 125MHz
Resolution: 10-7Hz to 100Hz (see Note)
Frequency (Range B)
Frequency Range: 80MHz to 3000MHz
Resolution: 1Hz to 10kHz (see Note)
Period (Range A only)
Period Range: 8ns to 330ms
Resolution: 10-7ns to 1us (see Note)
Measurement Time
Selectable as 10s, 1s or 0.1s. (Note that for the 0.1s setting the effective
measurement time is 0.3 seconds).
Resolution
The displayed resolution depends upon the measurement time and the input
frequency.
Eight digits (or nine using an overflow indication) are displayed for a 10s
measurement time.
Seven or eight digits are displayed for a 1s measurement time, and six or seven
digits for 0.1s
depending upon the input frequency. Usable resolution may be further reduced by
noise,
particularly at low frequencies.
Accuracy
Measurement accuracy is the sum of the timebase accuracy and measurement
resolution plus one count.
TIMEBASE
Crystal Oscillator Frequency:
10MHz
Initial Oscillator Adjustment Error: ± 2ppm (closed-case adjustable by user)
Oscillator Temperature Coefficient: Typically less than ± 0.3ppm/°C 18°C to
28°C, ±10ppm –20°C to 70°C
Oscillator Ageing Rate: <± 5ppm/year
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.
Signal activity indicator
When no input signal is detected the Trig indicator will be off, indicating that
no measurement is possible. The gate time indicator flashes until the first
measurement interval is complete.
INPUT SPECIFICATIONS
Input A
Input Impedance: 1MOhm//20pF (AC coupled)
Frequency Range: 3Hz to 125MHz
Sensitivity: Sinewave - 15mVrms 10Hz-125MHz
Input B
Input Impedance: 50Ohm (AC coupled)
Frequency Range: 80MHz to 3000MHz
Sensitivity: Sinewave - 15mVrms 80MHz-2GHz, 50mVrms to 3GHz
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.
DISPLAY
No. of Digits: 8 full digits
plus overflow indicator for 8.5 digits
Size of Digits: 11.5mm (0.45”)
Annunciators: 15 annunciators
POWER REQUIREMENTS
Battery Type: 9V PP3 alkaline
Battery Life: Typically 20 hours
Low Batt. Indicator: ‘Bat’ shows in display when approximately 10% of battery
life remains
GENERAL
Operating Range: +5°C to +40°C,
20% to 80% RH
Storage Range: -20°C to +60°C
Environmental: Indoor use at altitudes up to 2000m Pollution Degree 2
Size: 81mm x 178mm x 30mm (W x L x D)
Weight: 190gms excluding battery
Electrical Safety: Complies with EN61010-1
EMC: Complies with EN61326
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