THURLBY THANDAR INSTRUMENTS
PFM1300
1.3GHz hand-held frequency counter
MEASUREMENT FUNCTIONS
Frequency (Range A)
Frequency Range: 5Hz to 25MHz
Resolution:
10-7Hz to 10Hz (see Note)
Accuracy:
鹵
(1 digit + timebase error)
Frequency (Range B)
Frequency Range: 20MHz to 1.3GHz
Resolution:
1Hz to 1kHz (see Note)
Accuracy:
鹵
(1 digit + timebase error)
Period
Frequency Range: 5Hz to 25MHz
Resolution:
10-7ns to 1us (see Note)
Accuracy:
鹵
(1 digit + timebase error)
Note:
The resolution depends upon the measurement time and the input fre-
quency. At least 7 digits are displayed per second of measurement time.
Measurement time is selectable to be 0.1, 1, or 10 seconds.
THURLBY THANDAR INSTRUMENTS
T
T
i
PFM1300
5Hz to 1300MHz frequency range
q
Very high sensitivity at all frequencies
q
Frequency and period measurement, 0.0001mHz resolution
q
Reciprocal counting technique gives superior accuracy
q
Push-to-measure function with auto power-down
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Large 8 digit display with full range of annunciators
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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 automati-
cally switch off 15 seconds after the key is released.
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.
A hand-held counter with bench top performance
The PFM1300 is a highly compact battery powered frequency counter
which offers the convenience of a hand-held multimeter.
Surprisingly, however, its performance exceeds that of many bench top
counters of much higher cost.
A large and clear display
Despite its compact dimensions, the PFM1300 incorporates an 8 digit liq-
uid crystal display of the size you'd expect to find on a bench top instru-
ment.
A full range of annunciators provide indication of measurement function,
measurement time, overflow, trigger activity, low battery, and the mea-
surement units.
Operation is simplicity itself with all functions and ranges being selected
using just five large buttons.
INPUT SPECIFICATIONS
Input A
Input Impedance:
1M鈩?/25pF
Frequency Range: 5Hz to 25MHz
Sensitivity:
Sinewave 15mVrms 10Hz-20MHz
Input B
Input Impedance:
50鈩?nominal
Frequency Range: 20MHz - 1.3GHz
Sensitivity:
10mVrms 20MHz - 700MHz, 50mVrms to 1.3GHz
Signal activity indicator
When an adequate input signal is present the Trig indicator will show, indicat-
ing that a measurement is possible.
Noise filter
For Input A, a low pass filter with a cut-off frequency of 50kHz is user
selectable to ensure stable readings at low frequencies.
Wide frequency range and high sensitivity
The PFM1300 can measure frequencies in the range 5Hz to 1300MHz.
Unlike many counters, the sensitivity is high across the whole frequency
range with no dead spots.
A low pass filter can be selected to reduce high frequency signal noise and
ensure stable readings at lower frequencies.
DISPLAY
TIMEBASE
8 digits (11.5mm high) and 11 annunciators
Initial Error:
Temperature
Coefficient:
Low power consumption and push-to-measure
Despite its wide frequency range the PFM1300 has a remarkably low
power consumption enabling it to operate for many hours from a PP3 size
battery.
A push-to-measure capability gives a virtually instantaneous reading fol-
lowed by an automatic power down after 15 seconds.
This provides greatly extended battery life where continuous monitoring of
the signal is not required.
Alternatively it can be operated from AC line via a DC adaptor.
Reciprocal counting for improved resolution
The PFM1300 uses a reciprocal frequency counting technique which in-
volves multiple period measurements followed by computation of the recipro-
cal.
The system yields at least 7 digits of resolution per second of measure-
ment time and can measure low frequencies to a resolution of 0.0001mHz.
Typically <
鹵
0.3ppm/ C for 18oC to 28oC and
鹵
10ppm for -20
o
C to 70
o
C
Ageing Rate:
<
鹵
5ppm/year
POWER REQUIREMENTS
Battery Type:
9V PP3 alkaline
Battery Life:
Typically 12 hours continuous or 3000 press-to
-measure operations. Low battery indicator
PHYSICAL & ENVIRONMENTAL
Safety:
Designed and manufactured to IEC1010-1
Operating Range:
+5
o
C to +40
o
C, 20% to 80% RH
Storage Range:
-20
o
C to +60
o
C
Size:
81x178x30mm (W x L x D)
Weight:
190g excluding battery
o
鹵
2ppm (10MHz crystal)
Thurlby Thandar Instruments Ltd. operates a policy of continuous development
and reserves the right to alter specifications without prior notice.
Designed and built in the EEC by:
Frequency and period measurement
The PFM1300 can display signals in terms of period as an alternative to
frequency up to 25MHz.
Hold function
A Hold button allows readings to be frozen on the display for measuring non
continuous signals or recording results later.
Note:
This is a faxable data sheet, a colour brochure is also available.
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE18 7DX England
Tel: +44 (0)1480 412451
Fax: +44 (0)1480 450409
e-mail: sales@ttinst.co.uk Web: http://www.ttinst.co.uk
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