WAVECREST Corporation
DTS-2077 Calibration Procedure
(17 April, 1998)
5
5.0
Reference Voltage Operational Check
(5-1)
Using the voltmeter, set the power supply for each value shown in Table 1. Then remove
the voltmeter and connect the power supply to the DTS CH1. Press the "FUNC" key to
perform a pulse find operation. The displayed voltages at Menu #15 for CH1 should be
between the values shown in Table 1.
Table 1. Input Voltage Correlation
Selected Voltage
Min Reading Max
Reading
-1.000V
-1.0025V
-0.9975V
-0.250V
-0.2522V
-0.2478V
-0.025V
-0.0271V
-0.0229V
+0.025V
+0.0229V
+0.0271V
+0.250V
+0.2478V
+0.2522V
+1.000V
+0.9975V
+1.0025V
(5-2)
Repeat for CH2.
Note: Depending on the power supply drive capability, the 50 ohm input impedance of the
DTS may result in slightly lower readings on the DTS display. It may be necessary to
measure and set the DC voltage at the DTS input connectors using a “T” adapter.
6.0
Calibration Signal Outputs
(6-1)
Using the frequency counter and the oscilloscope and BNC-SMA adapter, if required,
measure the outputs of both the CAL1 and CAL2 connectors. Verify the outputs are:
2.0Vpp ± 0.2V
200 MHz ± 200 Hz
Note:
It is necessary to terminate both CAL outputs to 50 ohms when measuring outputs.
This can be done by measuring one channel while externally triggering from the
other output channel.
(6-2)
Connect the CAL1 to the CH1 channel, and the CAL2 to the CH2 channel using the SMA
coax cables.
(6-3)
Go to Menu #9 (see Figure 2-6 in the User's Guide) and change MEASURE to ON. Then
press the BURST button on the front panel. The display will read: Subsequent cables
will use this cable arrangement as a reference. To verify this, press BURST again.
The value displayed should be less than two picoseconds.
