YOKOGAWA WT200 User Manual page 223

Calibration of D/A Output
Verifying the Comparator Output Function
IM 253421-01E
Preparation
1. Connect the AC voltage standard to the voltage terminal of this instrument. The
wiring method is the same as when adjustments are carried out (see page 15-3).
2. Set the D/A output of this instrument to V1 for each channel.
Calibrating
1. Connect the DMM to ch1 of the output terminal in the same way as when
carrying out adjustments.
2. Set the voltage range of this instrument to a suitable range.
3. Set the output voltage of the voltage standard so that positive rated values are
generated.
4. Then read the value of the DMM and verify that this value lies within the
specifications.
5. Connect the DMM to ch2 of D/A output and carry out steps 3 and 4. Repeat this
for all D/A channels.
6. Set the output voltage of the voltage standard so that negative rated values are
generated.
7. Repeat steps 4 and 5 and verify all channels.
8. Turn the output of the voltage standard OFF.
Preparation
1. Connect the voltage standard to the voltage terminal of this instrument.
2. Set the range of this instrument to 15 V.
3. Set the comparator output to V1 for each channel.
4. Set the comparator setting value to 10V for each channel.
Calibrating
1. Set the output of the voltage standard so that the displayed value on this
instrument becomes 9.99 V, and output this voltage.
2. Measure the resistance values between all terminals of the comparator output
(between NO and COM or between NC and COM) using the DMM. Verify that
the resistance between NO and COM is at least 50 MΩ, and that the resistance
between NC and COM is at most 0.1 Ω.
3. Set the output of the voltage standard so that the displayed value on this
instrument becomes 10.01 V, and output this voltage.
4. Measure the resistance values between all terminals of the comparator output
(between NO and COM or between NC and COM) using the DMM. Verify that
the resistance between NO and COM is at most 0.1 Ω, and that the resistance
between NC and COM is at least 50 MΩ.
5. Turn the output of the voltage standard OFF.
15.2 Calibration
15
15-9