Compliance West CDT-240 Factory Calibration Procedure Download Page 9

Page: 9 / 13

Compliance Products USA, Inc
CAL-Fac-001-MP-CDT 240 Rev 2.3

Page 9 of 13

Main Relay (off-board): Disconnect at Peak

7.1.

All measurements 5% of maximum (peak) voltage
+5% = + 18.2° from peak (cos

-1

(.95))

equates to + 0.84 ms for 60 Hz, + 1.01 ms for 50 Hz

7.2.

All measurements are positive peak disconnect (POS) unless otherwise specified. An example of a
very accurate disconnect is shown below in

Figure 8. Example of Sine Wave disconnected on peak.

7.3.

To be within 5% of the peak, the disconnect needs to occur in the time between the two vertical red
lines shown below in

Figure 9. Range accepted for disconnect.

Summary of Contents for CDT-240

Page 1: ...IALS EQUIPMENT NEEDED 5 1 Calibrated DMM Qty 2 DMM1 for voltage RMS below 50V and the DMM2 for voltages RMS 50V or greater 5 2 Calibrated Oscilloscope with 10x or 100x probe 5 3 DC power supply 60V 5...

Page 2: ...document instead of mentioned CAL Log 2 2 Plug in the CDT 240 power cord plug in the EUT power cord to the proper value 90 260V 50 60Hz disconnect all the test leads attached to G L or N outputs disco...

Page 3: ...so that the CDT is not armed The oscilloscope should measure 0V on the BNC connector we expect to get same as Figure 2 adjust P3 in order to set this value Figure 2 Zero output on BNC connector with C...

Page 4: ...be 0 0V because the voltage decayed to zero in 3s Adjust P4 as needed so that the measured voltage is 0 0V turning the potentiometer clockwise makes the reading lower i e more negative Repeat the tes...

Page 5: ...50 0 V Line to Gnd measurement 5 1 3 Press the test button once to ARM the CDT You should see a sine wave signal on the oscilloscope as it shows it in Figure 5 Figure 5 Sine Wave Output on CDT 240 BNC...

Page 6: ...f the voltage is 60VDC for example You can see both TP7 TP6 test points on Figure 6 5 2 3 Record the Neutral to Ground voltage on section 3 N G of CAL Log 001 CDT 240 5 2 3 1 EUT Test Voltage DMM2 Neu...

Page 7: ...EUT voltage is 120V for example To read both meters simultaneously press the HOLD button on both meters at the same time if available 6 1 5 Record both input voltage and L G BNC voltage on section 4 o...

Page 8: ...EUT Test Voltage Expected value 6 2 4 3 Tolerance Expected Value 1 of reading 6 3 Line to Neutral No adjustment verification only 6 3 1 If the EUT connection is reverse connect as normal Figure 7 6 3...

Page 9: ...84 ms for 60 Hz 1 01 ms for 50 Hz 7 2 All measurements are positive peak disconnect POS unless otherwise specified An example of a very accurate disconnect is shown below in Figure 8 Figure 8 Example...

Page 10: ...tion was successful 7 4 5 1 Expected Value Value of previous Positive Sine Wave Peak 7 4 5 2 Tolerance Expected Value 5 0 of reading 7 5 Accuracy at 120V 60Hz input NEG peak 7 5 1 Connect a scope to t...

Page 11: ...he test time result on the CDT 240 8 2 Neutral to Ground Voltage Accuracy 8 2 1 Edit the test parameters for a Voltage test Trigger on NEG Voltage Test Voltage setting 50 0 V Neutral to Ground measure...

Page 12: ...uracy 9 2 1 Edit the test parameters for a Delay test Trigger on POS Delay Test Delay setting 1 second Line to Neutral measurement 9 2 2 Connect L N to 1s time constant terminals A and B of CAL BOX an...

Page 13: ...onfirm the oscilloscope voltage waveform after 1 second of Main relay disconnection measurement corresponds to the CDT 240 within 2 of reading 0 8V 9 3 7 Record on section 7 of CAL Log 001 CDT 240 9 3...