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15.2 Calibration
Calibration of D/A Output
Verifying the Comparator Output Function
15-10
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-
4). However, calibration of the WT230 can also be carried out when only
element 1 is connected.
2.
Set the D/A output of this instrument to V1 for each channel.
Set the crest factor to 3.
Calibrating
1.
Connect the D/A output terminal corresponding to channel 1 of the external I/O
connector in the same fashion as when making adjustments.
2.
Set the voltage range of the WT210/WT230 to an appropriate range.
3.
Set the output voltage of the voltage standard to match the positive rated value
of the rated range of the WT210/WT230.
4.
Read the value displayed on the DMM. This readout is the calibration value for
the positive D/A output.
5.
Set the output voltage of the voltage standard to match the negative rated value
of the rated range of the WT210/WT230.
6.
Read the value displayed on the DMM. This readout is the calibration value for
the negative D/A output.
7.
Connect the D/A output terminal corresponding to each channel to the DMM one
by one and repeat steps 2 to 6. Check the calibration value for all channels.
8.
Turn OFF the output of the voltage standard.
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 10 V for each channel.
Set the crest factor to 3.
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 50MΩ.
5.
Turn the output of the voltage standard OFF.
IM 760401-01E
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