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Kenwood VT-173, Instruction Manual

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Kenwood VT-173 Instruction Manual Download Page 2

C O N T E N T S 

1.  G E N E R A L 3 

2.  F E A T U R E S 3 

3.  S P E C I F I C A T I O N S 4 

4.  F U N C T I O N A L  C O N T R O L S 6 

5.  O P E R A T I O N 8 

6.  A P P L I C A T I O N S 11 

7.  M A I N T E N A N C E 13 

8.  A L I G N M E N T 14 

9.  C A U T I O N S  F O R  U S E • 16 

- 2 -

Summary of Contents for VT-173

Page 1: ...KENWOOD PRINTED II PAN AUTO RANGE VOLTMETER VT 173 I N S T R U C T I O N M A N U A L KENWOOD CORPORATION ...

Page 2: ...L 3 2 F E A T U R E S 3 3 S P E C I F I C A T I O N S 4 4 F U N C T I O N A L C O N T R O L S 6 5 O P E R A T I O N 8 6 A P P L I C A T I O N S 11 7 M A I N T E N A N C E 13 8 A L I G N M E N T 14 9 C A U T I O N S F O R U S E 16 2 ...

Page 3: ... and good characteristic of restoration from possible saturation due to excessive inputs b A large sized Taut band meter has a high sensitivity and reliability c The number of adjusting trimmers are minimized with the use of the amplifiers which are precisely calculated in the open loop gains and are negative biased through metal film resistors as accurate as 1 The amplifier characteristics theref...

Page 4: ...d 300V full scales dB 8 0 5 0 d B 0 d B 1 V dBm 8 0 5 2 d B m 0dBm 1mW 60012 Error W i t h i n 3 of full scale at 1kHz Frequency response 10 at 10Hz 1MHz 3 at 20Hz 200kHz and 2 at 50Hz 100kHz as referenced to 1 kHz response Input impedance 1 0 M O 5 with less than 45pF parallel capacitance Durable input voltage 500V DC f A C peak 1V to 300V range 100V D C A C peak 1mV to 300mV range Stability W i ...

Page 5: ...e 1Vrms 20 Output resistance 60012 20 Frequency response Within 3dB at 10Hz 500kHz Distortion Less than 1 at full scale Rated by signal noise ratio in 1 mV range Signal to noise ratio Over 40dB at full scale DC Output Amplifier Section Output voltage 1V 20 4 offset voltage at fullscale Offset voltage 100mV Output resistance 60012 20 Ripple Less than 10mVrms Frequency response Within 3dB at 10Hz to...

Page 6: ... N ON O F F O N O F F switch INPUT Input connector A U T O H O L D Mode selector switch DOWN Range DOWN switch UP Range UP switch A C O U T P U T A C output terminalctor R E L A T I V E R E F R E L A T I V E R E F controller U N C A L Uncaliblation indicator VOLTES DECIBELS Meter R A N G E RANGE indicator lamp M E T E R zero adjust trimmer 6 ...

Page 7: ...Figure 2 Rear Panel View Figure 3 Figure 4 _7 _ ...

Page 8: ...here the meter pointer indicates a value from 27 to 102 of the full scale standard value 3 If the level of the input signal corresponds to a value from 85 to 102 of the full scale standard value a 1 level higher range may be selected to indicate the voltage within 27 to 32 standard value In such a case the sensitivity can be increased by 1 range with the DOWN switch to indicate the voltage within ...

Page 9: ... 10 on the 0 10 scale indicates 1V In the 300mV range division 3 on the 0 3 scale indicates 300mV Scales correspond to voltages likewise in other rancje 2 dB Scale The dB scale marked with dBV in general indicates 1V as OdB The 0 10 scale has voItage ratio based divisions and division 10 on it corresponds to OdB If the meter reads 6 d B in measurement using the 20dB 10V range the measured value is...

Page 10: ...r unit 1 0 Then set the M O D E selector switch on the remote control box to R E M O T E position By this the measurement ranges of the VT 173 can be remote controlled with the R A N G E selector on the remote control box By setting the M O D E selector on the remote control box to P A N E L the VT 173 can be operated on the panel For details see the Instruction Manual of the RT 61 Note To use the...

Page 11: ...ative feedback amplifiers that is it is available for measuring an open loop gain of each amplifier circuit with the negative feedback signal leaves applied Further the method can be used for measuring the frequency responses of given circuits by changing the signal generator frequency A s an example let us calculate the open loop gain from point A to B of the negative feedback amplifier shown in ...

Page 12: ...n square value and peak value can be cal culated as follows Be sure to use the H O L D manual mode to measure non sinusoidal wave voltage a Assume that the meter reads x 2 v T Absolute mean value x 0 9 x 71 Root mean square value Absolute mean value x form factor Peak value Root mean square value x crest b For rectangular waves their form factor is unity 1 and the crest unit 1 2 2 Absolute mean va...

Page 13: ...E When a fuse goes 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 AC 100V 120 0 2A AC 220 V 240 V 0 1A 4 CHANGING THE S U P P L Y V O ...

Page 14: ...the Z E R O A D J U S T screw of the meter 2 Turn on the power of the VT 173 then set the M O D E selector switch 3 to H O L D position Rotate the R E L A T I V E R F F control clockwise to activate it 3 Connect the voltmeter calibrator output 1kHz or 400Hz to the I N P U T connector 4 Set the calibrator output voltage to 300mV to set the range of the VT 173 to 300mV Control VR102 so that the mete...

Page 15: ...VR201 counterclockwise slowly untill the measurement range is changed into 300mV 14 Control the R E L A T I V E R E F so that the meter reads approx 80mV then set the measurement range to 100mV with the DOWN switch 15 Rotate the R E L A T I V E R E F clockwise slowly and check that the measurement range is automatically changed into 300mV range when the meter reads 102mV 16 Control the R E L A T I...

Page 16: ...nt range is set to 1mV 300mV Thus use great care 6 Beware of line noises or other low level noises since the VT 173 is a highly sensitive voltmeter Great care should be used when a long cable or an instrument of poor isolation is connected to the MONITOR O U T connector 7 Be sure to use the HOLD manual mode to measure non sinusoidal wave voltage 8 The O N O F F switch of thit is designed to act on...

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