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Cromtech India

Mumbai, Maharashtra

| GST  27AAGFC9381G1Z6

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Test & Measuring

Our range of products include DDS Function Signal Generator, Auto Tuning Distortion Analyzer, Four Probe Method, Universal IC Tester, Digital Multimeters and Multi Meters.

DDS Function Signal Generator
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Features

  • 9 function waveform;
  • high resolution:100uHz,8 digital display;
  • PC interface(R232.GPIB);
  • Windows wave edit and download software;
  • 6 types arbitrary wave (32K/C);
  • Large screen back light LCD display menu driven;
  • Frequency sweep (linear, log).FSK. pulse filled,
  • Pulse serial Int FM, Int AM.
Specifications

MODEL

YB3002

YB3003

YB3005

YB3010

YB3015

YB3020

YB3030

YB3040

YB3050

Wave formSine, rectangular, triple, pulse, rise ramp, fall ramp, random noise, SIN(x)/x, rise log, fall log etc.
Frequency
Sine1μHz~
2MHz
1μHz~
3MHz
1μHz~
5MHz
1μHz~
10MHz
1μHz~
15MHz
1μHz~
20MHz
1μHz~
30MHz
1μHz~
40MHz
1μHz~
50MHz
Rectangular1μHz~
2MHz
1μHz~
3MHz
1μHz~
5MHz
1μHz~10MHz
Other wave form1μHz~1MHz
Max resolution8 digital or 0.1μHz
Long stability50ppm
Signal Characteristics
Rectangular rise time≤20ns
Over shot≤5%
Rectangular asymmetry(1kHz)1%
Pulse duty cycle0.1~99.9%(10KHz)
1%~99%(10kHz~100kHz) 
3%~97%(1MHz)
Triple, ramp linearity (1kHz)<0.1%
Output A
Amplitude setup2mVpp~2Vpp(High resistance);
1mVpp~10Vpp(50Ω)
2mVpp~6Vpp(High resistance);
1mVpp~3Vpp(50Ω)
Attenuation error(1kHz)<5%
Frequency response (1Vpp, base:1kHz)<5%
Setup ratio setup (<5Vpp)-100%~100%
Input impedance50Ω
Output B
Wave formBuild-in wave form
Amplitude200mVpp~2Vpp(High resistance);
100mVpp~10Vpp(600Ω)
Output impedance600Ω
Frequency Range0.1Hz~20KHz

 

 

 

 

 

 

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Auto Tuning Distortion Analyzer
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Features:

  • Digital Read out for Distortion and Level Measurement
  • Auto And Manual Tuning for Distortion Measurement
  • Frequency Range : 20 Hz to 200 KHz
  • Level Meter Range : 1m V to 300 V
  • Level Meter Response up to 2 MHz

Speifications:

  • Distortion Measurement
  • Distortion Measuring Range :  0.1% to 100% in three ranges.
  • Frequency Range :  20 Hz to 200 KHz
  • Automatic Nulling Range: From 20 Hz to 200 Hz (Manual Null Tuned to 3% of Set Level)
  • From 200Hz to 20KHz (Manual Null tuned to 10% of Set Level)
  • Input Range :150 mV to 40 Vrms (External Attenuator to be used for voltage more than 40V ; up to 250 Vrms)
  • Input Impedance : 1 Mohms.
  • Fundamental Rejection : More than 80 dB
  • Second Harmonic Accuracy : 1 dB Typical
  • Distortion Introduced : 0.05% (Max) By Instrument
  • Automatic Null Accuracy : Within ± 2 dB ; Manual Null

Level Meter:

  • Voltmeter Range : 3 mV to 300 Vrms in 6 ranges
  • Frequency Range : 20 Hz to 2 MHz
  • Basic Accuracy : ± 3% of Reading, ± 1 Digit At 10 KHz.
  • Residual Noise : Less than – 80 dB.
  • Frequency Response : 3mV to 10V 5% upto 100 KHz, 10% upto 2 MHz
  • 30V and 300V ranges 5% upto 100 KHz
  • Output Impedance : 2.2 Kohms (Approx)
  • Input Impedance : 11 Mohms (Approx)
  • Facility for monitoring Provided residuals

General:

  • Read Out : Digital Panel Meter
  • Power Supply : 230V ± 10% ; 50 Hz
  • Operating Temp : 0 – 400C

Accessories:

  • Banana to Crocodile cable : 1 Pair
  • Instruction Manual : 1 No.
  • Attenuator (Optional).

 

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Four Probe Method
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Four Probe Method

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Resistivity of Semiconductors by Four Probe Method at Different Temperatures and Determination of the Band-gap               

The Four Probe Method is one of the standard and most widely used method for the measurement of resistivity of semiconductors. The experimental arrangement is illustrated. In its useful form, the four probes are collinear. The error due to contact resistance, which is specially serious in the electrical measurement on semiconductors, is avoided by the use of two extra contacts (probes) between the current contacts. In this arrangement the contact resistance may all be high compare to the sample resistance, but as long as the resistance of the sample and contact resistances are small compared with the effective resistance of the voltage measuring device (potentiometer, electrometer or electronic voltmeter),the measured value will remain unaffected. Because of pressure contacts, the arrangement is also specially useful for quick measurement on different samples or sampling different parts of the same sample.

Description of the experimental setup

1. Probes Arrangement

It has four individually spring loaded probes. The probes are collinear and equally spaced. The probes are mounted in a teflon bush, which ensure a good electrical insulation between the probes. A teflon spacer near the tips is also provided to keep the probes at equal distance. The whole –arrangement is mounted on a suitable stand and leads are provided for the voltage measurement.

2. Sample

Germanium crystal in the form of a chip

3. Oven

It is a small oven for the variation of temperature of the crystal from the room temperature to about 200°C (max.)

4. Four Probe Set-up

The set-up consists of three units in the same cabinet.

(i) Multirange Digital Voltmeter

In this unit, intersil 3½ digit single chip A/D Converter ICL 7107 has been used. It has high accuracy like auto zero to less than 10mV, zero drift of less than 1mV/°C, input bias current of 10pA max. and roll-over error of less than one count. Since the use of internal reference causes the degradation in performance due to internal heating, an external reference has been used.
Specifications 

RangeX1 (0-200mV) & X10 (0-2V)
Resolution100mV at X1 range
Accuracy±0.1% of reading ±1 digit
StabilityWithin ±1 digit
Input Impedance1MW
Display3½ digit, 7 segment LED (12.5mm height) with auto polarity and decimal indication
Overload IndicatorSign of 1 on the left & blanking of other digits

 

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Universal IC Tester
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Universal IC Tester

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  • It can test more than 600 IC’s comprising of 74 Series, 40/45 Series
  • It can test Micro-processor 8085, 8086, Z80, 8051, 89c51 and Peripherals like 8255, 8279, 8253, 8259, 8251, 8155, 6264, 62256, 8288, 8284 etc.
  • It tests Op-amp, 555, Transistor Arrays, Analog switches, Opto couplers etc.
  • It tests Seven Segment Display of common cathode and common anode type
  • It has Auto search facility of all Digital IC’s
  • Test by: Truth table / sequence table comparison
  • ZIF : 40 pin DIP ZIF sockets
  • Keys : 28 cherry keys Key pad with numerical and functional keys
  • Display : 9 Digit Seven Segment Display
  • Supply Input Voltage: 230V AC


Additional Information:

  • Item Code: Dict02

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Universal IC Tester
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Universal IC Tester

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  • It can test more than 1500 IC’s comprising of 74 Series, 40/45 Series
  • It can test Micro-processor 8085, 8086, Z80, 8051, 89c51 and Peripherals like 8255, 8279, 8253, 8259, 8251, 8155, 6264, 62256, 8288, 8284 etc.
  • Test a wide range of Analog IC’s such as Op-amp, 555 Timers, Transistor Arrays, Analog switches, Opto-couplers, ADC, DAC, Comparators, Waveform Generator, PWM IC, Sample Hold IC, Voltage Regulator, DPM IC, Frequency to Voltage coverter, Latch driver, VCO IC’s PLL IC’s Cross Point Switch etc.
  • It tests Seven Segment Display of common cathode and common anode type
  • It has Auto seach facitlity of all Digital IC’s
  • ZIF: Two numbers of 40 pin DIP ZIF sockets,
  • Keys: 50 cherry keys Keypad with numerical and functional keys
  • Display: 16 x 2 LCD Display
  • Supply Input Voltage 230V AC.


Additional Information:

  • Item Code: Dict03

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Digital Multimeters
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Digital Multimeters

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Display 3-1/2 Digits 1999 Counts LCD
DC Voltage0-200mV/2V/20V/200V/1000V.
Accuracy± 0.5 %
AC Voltage0 - 200V / 750V
Accuracy ± 1.2%
DC Current0 - 200 A / 2mA/ 20mA/ 200mA/ 10A
Accuracy± 1.0%
Resistance0 - 200 /2K/20K/200K/2 M Ohms
Accuracy± 1.0%
With Diode Test, Transistor test and Data Hold facility
Confirms to CE, CAT - III 600V, CAT - II 1000V, IEC 1010-1


Additional Information:

  • Item Code: XB30

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Multi Meters
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Multi Meters

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Display 3-1/2 Digits 1999 Counts LCD
DC Voltage0-200mV/2V/20V/200V/600V.
Accuracy± 0.5 %
AC Voltage0 - 200V / 600V
Accuracy ± 1.2%
DC Current0-200 A/2mA/20mA/200mA/10A
Accuracy± 1.0%
Resistance0 - 200 /2k/20k/200k/20M Ohms
Accuracy± 0.8%
Transistor Test Facility
Temperature-20 °C to 750 °C/ -4 °F to 1400 °F
With Diode Test, Continuity test and Data Hold facility 
Confirms to CE, CAT - II 600V


Additional Information:

  • Item Code: XB31

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Multi Meters
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Multi Meters

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Auto Power Off
Data Hold to freeze the displayed reading
Display 3-1/2 Digits 1999 Counts Backlit Extra Large LCD
DC Voltage0-200mV/2V/20V/200V/1000V.
Accuracy± 0.5 %
AC Voltage0 - 2V /20V/200V/750V
Accuracy ± 0.8%
DC Current0 - 20mA /200mA/20A
Accuracy± 0.8%
AC Current0 - 20mA /200A/20A
Accuracy± 1.0%
Resistance0 - 200 /2k/20k/200k/2M/200M Ohms
Accuracy± 0.8%
Capacitance0-20nF / 2 F/200 F
Accuracy± 2.5%
Temperature-40 °C to 1000 °C 
Accuracy± 0.8% 
Frequency 0 - 2k/200kHz
Accuracy± 3.0% 
With Diode Test, Transistor Test, Hot Wire Test and Audible Continuity test facility 
Confirms to IEC1010 CE, CAT II 1000V


Additional Information:

  • Item Code: DM603

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Function Generator
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Function Generator

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MODEL

FG 5102 A

FG 5102 B

FG 5102 C

FG 5102 D

Frequency
Frequency Range      0.02 Hz to 2 MHz in 7 Ranges0.2 Hz to 2 MHz in 7 Ranges0.02 Hz to 2 MHz in 7 Ranges
Output Waveform      Sine Wave, Triangle Wave, Square Wave, Pulse Wave, Saw-Tooth,  TTL-Level Square Wave, Ramp Wave, Skewed Sine Wave. 
Frequency accuracy± 5 % of full scale to 200kHz
± 8 % of full scale to 2MHz
± 2 % of setting5 ppm + 1 digit
Frequency display      Analog dial3 ½ digit LED4 digit LED
External Frequency Control (Frequency Modulation)   
Input Voltage0 to 10V (DC + AC Peak)
Frequency variable range100 : 1 or more10 : 1 or more100 : 1 or more
Symmetry
Symmetrical variable10 : 1 to 1: 10 or more
Sine Wave
Distortion± 1% or less (10Hz to 100KHz)
Flatness± 0.35V (10V Reference level)
Triangle Wave         
Linearity± 1% or less (10Hz to 100KHz) ;    ± 5% or less (100KHz to 2MHz)
Square Wave
Symmetry ± 3% or less (at max. 1KHz)
Rise / Fall Time100 nS or less






Additional Information:

  • Item Code: FG5102

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