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2 CHANNEL AC VOLTMETER

VT-176

VT-177

INSTRUCTION MANUAL

KENWOOD CORPORATION

©PRINTED IN J , ,N

KENWOO

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Summary of Contents for VT-176

Page 1: ...2 CHANNEL AC VOLTMETER VT 176 VT 177 INSTRUCTION MANUAL KENWOOD CORPORATION PRINTED IN J N KENWOOD ...

Page 2: ...CONTENTS 1 G E N E R A L 3 2 F E A T U R E S 3 3 SPECIFICATIONS 4 4 FUNCTIONAL C O N T R O L S 6 5 OPERATION 8 6 APPLICATIONS 10 7 MAINTENANCE 13 8 A L I G N M E N T 14 9 CAUTIONS FOR USE 16 2 ...

Page 3: ...labe to check the input range VT 177 is measuring range can be remotely controlled by RT 62 VT 176 RT 61 a Two power source circuits positive and negative are provided for very stable DC bias and recover from any overload in a very short time b Small sized compact construction is easy to carry and large sized two pointer meter is easy to read c Four scale dial plate and red and black pointers allo...

Page 4: ...eter Section Measurable voltages 0 3mV 100V in 12 ranges 0 3mV 1mV 3mV 10mV 30mV 100mV 0 3V 1V 3V 10V 30V and 100V full scales dB 90 40dB 0dB 1V dBm 90 42dBm 0dBm 1mW 60012 Error Within 3 of full scale at 1kHz Frequency response 10 at 5Hz 1MHz 5 at 10Hz 500kHz and 3 at 20Hz 200kHz as 2 at 30Hz 100kHz referenced to 1kHz response Input impedance 10MO 5 with less than 45pF parallel capacitance Durabl...

Page 5: ...mV 1mV and 1V ranges Signal to noise ratio Over 40dB at full scale Over 30dB at 0 3mV range Frequency response Within 3dB at 5Hz 500kHz Environmental Coefficient 0 08 C Tempe rature within specification 10 40 C full operation 0 50 C Relative humidity Less than 80 Power Supply Section Line voltage 100 120 220V A C 10 216 250V A C 50 60Hz Power consumption Approx 7W Dimensions 128 138 Wxl90 212 Hx23...

Page 6: ...on off switch R A N G E C H 1 2 Channel 1 and 2 atten uator range selector CH1 INPUT Channel 1 input connector C H 2 S E L E C T O R Individual interlock range setting selector CH2 INPUT Channel 2 input connector R A N G E C H 2 Channel 2 attenuator range selector GND M O D E O P E N m G N D Negative input float switch Dual pointer meter Meter zero adjust trimmer C H I l e f t CH2 right ...

Page 7: ...ding post O U T P U T 2 Channel 2 monitor output connector Power cable connector Power cable connector O U T P U T 1 Channel 1 monitor output connector CONT INPUT VT 176 type Remote control mounting hole VT 177 type Connectc for remote control VT 177 type Only Figure 1 Rear Panel View Range indicator lamp _7 _ ...

Page 8: ...nd the R A N G E CH2 selector to 100V To measure an A C voltage superimposed on a DC voltage be sure to set the selectors to the positions before connecting the cables to points to be measured Otherwise the DC voltage causes a high surge which could burn voltmeter GND M O D E is effected with the switch released ML in which both CH1 and CH2 are connected to the grounding terminal of the casing tak...

Page 9: ...age level on the scale be 1V with the R A N G E selector at 1 V a given voltage can be read as low as 70dB 0 3mV by turning the selector downward Further as the scale allows reading to 2 0 d B 0 03mV you can continuously measure the voltage ratio as high as 90dB 0 03mV to 1 V The read of 90dB mea a signal to noise 9 ratio of around 10dB Also the dB scale allows continuous measuring up to 40dB 1 to...

Page 10: ...ion manual for RT 61 or RT 62 The basic use of your voltmeter is to measure sinusoidal wave voltages as an A C voltmeter In addition it provides a wide variety of applications as described below Amplifier Gain Measurement Voltmeter is capable of measuring an amplifier gain which is a signal magnification from point A to B in Figure 4 with a signal generator connected to the amplifier input If the ...

Page 11: ...l Waveforms An voltmeter of absolute mean value indication type reads root mean square values of sinusoidal wave inputs Also it deflects the pointers in proportion to the absolute mean value of a given input wave If the form factor root mean square value absolute mean value of the input wave and the crest factor peak vaIue root mean square value are known then the root mean square value and peak v...

Page 12: ...hannel voltmeter CH2 S E L E C T O R switch to pressed interlock position as most stereo amplifiers are not deviated vertually in the left and right channel levels Set the GND M O D E switch to GND If the given stereo amplifier output has no connector common to the left and right channels then turn the switch to OPEN and connect the GND post on the rear panel of voltmeter to that of the stereo amp...

Page 13: ...out the device is no longer operable If gone out check for a trouble cause remedy it remove the cap of the fuse holder on the rear panel using a minus screw driver and take it out and replace the fuse with a new one When replacing fuse be sure to check the capacity of a new fuse for a specified value as follows A C 100V 120V 0 5A A C 220V 240V 0 3A C H A N G E O V E R O F V O L T A G E IN SWITCHIN...

Page 14: ...llows Preset Controls on Side Panel see Figure9 The following controls placed on the Main PC board X65 1210 02 are to be preset on the right hand side panel I D E N T I F I C A TION D E S C R I P T I O N TC101 First Attenuator preset trimmer capacitor VR101 First Attenuator preset variable resistor VR102 Meter Amplifier gain preset variable resistor 1 Before turning the O N O F F switch O N adjust...

Page 15: ...ut voltage to 10V 7 Adjust VR101 until the pointer swings to the full scale 8 Disconnect the voltmeter calibrator and connect a wideband signal generator to the CH 1 INPUT con nector 9 Set the signal generator frequency to 1 kHz and set the R A N G E C H 1 2 selector on voltmeter to the I V range 10 Adjust the signal generator output level until the pointer swings to the fullscale 11 Change the si...

Page 16: ... line noise and similar small noises as your voltmeter is a highly sensitive voltmeter 6 Do not leave your voltmeter at any of high temperature and humidity places for a long period of time 7 As having two channel independent voltmeter your voltmeter is involved in selection of grounding point on some equipment udner measurement Set the GND M O D E switch to O P E N and connect the GND post of you...

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