Compliance Products USA, Inc
CAL-Fac-001-MP-CDT 240 Rev 2.3
Page 11 of 13
8.
CBX 1 Second RC Time Constant - Voltage Test.
8.1.
Line to Ground: Time Accuracy.
8.1.1.
Edit the test parameters for a Voltage test:
•
Trigger on POS
•
Voltage Test
•
Voltage setting: 50.0 V
•
Line to Ground measurement
8.1.2.
Connect L-G to 1s time constant terminals “A” and “B” of CAL-BOX and also connect an
oscilloscope using a 10X or 100X probe.
8.1.3.
Perform a test and disconnect one end of the CAL-BOX after 0.7 – 0.9 seconds, see video
CBX1V, confirm the oscilloscope time measurement correspond to the CDT-240 (within +/-
0.01s).
8.1.4.
Record on section 6 of CAL-Log-001-CDT 240.
8.1.4.1.
Waveform value time: Oscilloscope time measurement from Main relay disconnection
until CBX is unplugged “fast decay”.
8.1.4.2.
Tolerance time: Waveform value time +/- 0.01s.
8.1.4.3.
As left time: This is the value of the 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 measurement
8.2.2.
Reverse the polarity of the EUT voltage by unplugging the EUT power cord, swap the Line and
Neutral spade lugs on the power connector, and reconnect EUT power, as it shows it in
8.2.3.
Connect N-G to 1s time constant terminals “A” and “B” of CAL-BOX and also connect an
oscilloscope using a 10X or 100X probe.
8.2.4.
Perform a test without disconnecting the CAL-BOX, confirm the voltage on the waveform
corresponds to CDT-240 Voltage within ±2% of reading ±0.8V.
8.2.5.
Record on section 6 of CAL-Log-001-CDT 240.
8.2.5.1.
Waveform value voltage: Voltage level at CDT-240 time result. Note: Compensate for
oscilloscope offset.
8.2.5.2.
Tolerance voltage: Waveform value voltage ±2% of reading ±0.8V.
8.2.5.3.
As left voltage: This is the value of the voltage result on the CDT-240 (50V +0V -0.8V).
8.2.6.
Return back the polarity of the EUT to normal connection.
