YOKOGAWA 320110, Руководство пользователя

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IM 3201–E
3.5 Measurement of Low (Audio) Frequency Output Level
1. The output level denotes the voltage in the audio frequency
range, being applied to a specific load impedance. This output
voltage is expressed in dB.
2. This instrument is calibrated for a 0 dB reference level when 1
mW of power is developed in a 600 Ω load (0.775 AC V into 600
Ω).
3. Measuring procedures are as described in the paragraph “AC
Voltage Measurement”. The indication is read out on the [dB]
scale.
4. The dB values on the scale are the ones when the measure
range select switch is set to the “AC 3 V” range. Add dB value
read from value indicated on dB chart (shown below right) on the
scale panel.
AC.V RANGE
ADD dB
3 12 30 120
0 12 20 32
0 dB: 1 mW 600 Ω
3.6 Resistance Measurement
CAUTION
There is a risk of electrification or damaging the
instrument.
· Prior to measuring the resistance in the circuit of equipment,
the power source to the equipment must be disconnected.
· For the measurement of a circuit which includes capacitors,
the charged electricity must be discharged from the capacitor.
Note that the external voltage may burn the resistors of the
tester.
1. Connect the two measuring lead probes respectively to the
V.A. Ω
and COM- terminals.
2. Set the polarity select switch to the
+DC,AC, Ω
position.
3. Set the measuring range select switch to a desired position on
the “Ω” range. Short the tip ends of the two measuring probes
of the leads. Turn the zero ohm adjust knob
Ω ADJ
and set the
pointer to zero of the [OHM] scale.
Note: This zero adjustment must be repeated each time when the
measuring range is changed over to another.
4. Connect the tip ends of the measuring probes respectively to
the points across which the resistance is to be measured. Take
the reading on the [OHM] scale, and multiply the value read by
the multiplying factor of the applying measuring range. Thus, the
resistance value is obtained.