Model SRC3165 - Precision Frequency Counter

Channel A (0.01Hz ~ 50MHz)
Frequency Range: DC couple 0.01Hz to 100Hz
                            AC couple 100Hz to 50MHz
Sensitivity: AC: 100Hz ~ 50MHz < 50m Vrms
                 DC: 0.01Hz ~ 1Hz ≤ 500m Vp-p
                 1Hz ~ 100Hz ≤ 80m Vrms
Impedance: 1 Mohms
Attenuator: X1, X20
Max. Safety Voltage: 30V (DC/AC peak)
　

Channel B (50MHz ~ 2.4GHz)
Frequency Range: from 50MHz to 2.4GHz
Sensitivity: 50MHz ~ 1.2GHz ≤ 50m Vrms
                1.2GHz ~ 2.4GHz > 80m Vrms
Coupling: AC only
Impedance: 50 ohms
Max. Safety Voltage: 3V

Time Base: Short-Time Stability: ± 3 x 10-9/sec
                  Long-Time Stability: ± 2 x 10-5/month
                  Temperature Drift Coefficient: ± 1 x 10-5, 10°C ~ 40°C
                  Line Voltage Variation: ± 1 x 10-7 for line voltage ± 10%
Gate Time: continuously variable from 100ms to 10s
Display: 8 digits, 19 x 12.5mm LED display with steps, frequency, period, kHz/s and MHz/ms indication
Precision: standard time error (t) x frequency (f) ± 1d
Power Supply: 110V/220V ± 10%, 50Hz or 60Hz
Preheat Time: 20 min
Operation temperature: 0°C ~ 50°C, 10 ~ 90% RH
Storage Temperature: -40°C ~ 60°C, 5 ~ 90% RH
Weight: approx. 1.6kg
Dimensions: 270 x 215 x 100mm
Accessories: this manual, power cord, test probe

Model SRC2000 - Frequency Counter

This SRC2000 is an intelligent multi-function instrument which measures Frequency, Pulse counting, Crystal. It has 4 step gate time, 5 range function select and 8 digits display.

All functions depend on single CPU, A crystal controlled temperature circuit provides constant compensation for the temperature drifting.

Technique specifications:

A. Measurement

1. Input terminal

There are 3 input terminals on this instrument:

CHA. High frequency 50 MHz - 2,4000 MHz

CHB. Low frequency  10Hz - 50 M Hz

Crystal Oscilloscope: for crystal measurement

Gate Time: 0.1S,1.0S,5.0S, 10S

Accuracy: Time base deviation X frequency +- 1 d

Progressive Counting measurement

4 steps CHB input terminal

resolution: +- 1d, counting frequency: 10Hz - 4Mhz

Crystal measurement:

Input Features:

Input sensitivity for CHA  25mVrms/200m Vrms

Input impedance: approx. 50 Ohm

Max safety voltage 3 V

Input sensitivity for CHB: No.2 range 25m Vrms/80 m Vrms

                            No.3 range 10mVrms/30m Vrms

Input impedance: approx. 1 M ohm ( less than 35 pF)

Max Input safety voltage: 30V

Time base:

Short term stability: +- 3 X 10^-9/second

Long term stability: +- 2 X 10^-5/Month

Temperature: +- 2 X 10^-5/10^oC - 40^o C

Power: 110 - 220V

Size: 270 X 215 X100 mm

Weight: Approx. 1550 g.

Model SRB3371 / SRB3381 - Multi function Counter

Feature
Microprocessor to realize intelligent measurement;
Low pass filter and attenuator in pre-position circuit;
Count backwards, realize the equivalent accuracy
measurement with fast speed and high sensitivity;
Micro SCM to measure freq period and intelligentize the management;
LSI design and CPLD application to diminish the components qty
and the average working time be not less than 10000h without fault;
Fine outline, small, light, easy to handle;