Extech Instruments 381235, Руководство пользователя

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381235 Ver. 1.5 3/01
2
Specifications
General Specifications
Display 0.5” (13mm) 8-digit LCD
Functions Frequency, Data Hold, Relative, Max/Min/Avg & Period
Input connectors BNC female
Meter housing Durable ABS plastic
Operating conditions 32 to 122
o
F (0 to 50
o
C); < 90% RH
Power supply 4 x 1.5V AA cells
105mA DC approx. 2500MHz/500MHz ranges Power consumption
45mA DC approx. for 10MHz & Period ranges
AC adapter (option) 9VDC, 300 to 500mA (center socket pin positive)
Dimensions; weight 6.8 x 3.1 x 1.4” (173 x 80 x 35mm); 0.75 lbs (340g)
Electrical Specifications
Ch. A: 2500MHz Frequency range
Ch. B: 500MHz
Period range Ch. C: 10MHz
Resolution, sample rate and
sensitivity
Refer to Sections 2.3 and 2.4 below
Accuracy ± (4 ppm + 1 digit) @ 23
o
C ±5
o
C
Time base 4.194 MHz quartz crystal
Temp. coefficient 0.1 ppm per
o
C typical
5V peak to peak max. for 2500/500MHz range Input overload
250V peak to peak max. for 10MHz & Period range
Resolution and sampling rate specifications
Range Gate time selection Resolution (Hz) Sampling time (sec)
FAST 1000 0.5
SLOW 100 2.75
SLOW (select 1) 200 1.5
2500MHz
SLOW (select 2) 500 0.75
FAST 100 0.75
SLOW 10 6
SLOW (select 1) 20 5
500MHz
SLOW (select 2) 50 1.5
FAST 10 0.5
SLOW 1 1.25
SLOW (select 1) 0.2 6
10MHz
SLOW (select 2) 0.1 11
NOTE: In SLOW Gate Time mode (Gate switch set to SLOW), pressing the RESO key
scrolls the meter through SLOW, SLOW (Select1), and SLOW (Select 2) modes.
Sensitivity specifications
100mVrms (50MHz to 75MHz)
Ch.A: 2500MHz range
50mVrms (76MHz to 2500MHz)
120mVrms (10M to 35MHz)
50mVrms (36M to 350MHz)
Ch.B: 500MHz range
120mVrms (351M to 450MHz)
Ch.C: 10MHz range, Period
50mVrms
Notes on sensitivity:
The apparent sensitivity when feeding a signal into Ch.A may vary
considerably, particularly near 1GHz. The meter’s input impedance is a complex impedance,
whereas the output of most signal generators is calibrated for a 50 Ω resistive load. This will
result in a terminal voltage different to that expected by the generator, and therefore a
different sensitivity.