Instructions

Signal calibration
The self calibration routine lets you quickly optimize the oscilloscope signal path for maximum measurement accuracy. You
can run the routine at any time, but you should always run the routine if the ambient temperature changes by 5 °C or more.
1. Disconnect all probes and cables from the channel input connectors (channels 1 and 2).
2. Push the Utility button and select the Do Self Cal option to start the routine. The routine takes approximately one minute
to complete.
3. Verify that self calibration passed.
Check DC gain accuracy
This test checks the DC gain accuracy of all input channels.
1. Set the DC voltage source output level to 0 V.
2. Set up the oscilloscope using the following table:
Push menu button Select menu option Select setting
Default Setup - -
Channel 1 Probe 1X
Acquire Average 16
Measure Source Channel under test
Measurements Mean
3. Connect the oscilloscope channel under test to the DC voltage source as shown in the following figure:
4. For each vertical scale (volts/division) setting in the following table, perform the following steps:
a. Set the DC voltage source output level to the positive voltage listed and then record the mean measurement as
V
pos
.
b. Reverse the polarity of the DC voltage source and record the mean measurement as V
neg
.
c. Calculate V
diff
= V
pos
- V
neg
and compare V
diff
to the accuracy limits in the following table:
Vertical Scale (volts/div)setting DC voltage source output levels Accuracy limits for V
diff
5 mV/div +17.5 mV, -17.5 mV 33.6 mV to 36.4 mV
200 mV/div +700 mV, -700 mV 1.358 V to 1.442 V
2 V/div +7.00 V, -7.00 V 13.58 V to 14.42 V
5. Set DC voltage source output level to 0 V.
Performance verification
TBS1000 Series Oscilloscopes Series Digital Storage Oscilloscope Technical Reference 15