Offset Accuracy Test - Keysight 9000 Series Service Manual

Chapter 3: Testing Performance

Offset Accuracy Test

Offset Accuracy Test
C A U T I O N When using the 50
exceeds ±5 V.
Let the oscilloscope warm up before testing
The oscilloscope and other equipment under test must be warmed up (with the oscilloscope
application running) for at least 30 minutes prior to the start of any performance test.
Specifications
Offset Accuracy
50 Ohm Input Impedance: Full scale is defined as 8 vertical divisions. Magnification is
used below 10 mV/div. Below 10 mV full scale is defined as 80 mV. The major scale set-
tings are 5 mV, 10 mV, 20 mV, 50 mV, 100 mV, 200 mV, 500 mV and 1 V.
1 MOhm Input Impedance: Full scale is defined as 8 vertical divisions. The major scale
settings are 5 mV, 10 mV, 20 mV, 50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, and 5 V.
Equipment Required
Description
Digital Multimeter
Cable Assembly
(2 required)
DC Power Supply
Adapter
2 Adapters
The offset accuracy specification consists of two terms: offset gain and zero error. The offset gain
characteristic is ±1.25% of channel offset and the zero error characteristic is ±1% of full scale. The
offset accuracy test procedure tests the zero error and offset accuracy.
Procedure
Zero Error Test
1 Disconnect all cables from the scope channel inputs.
2 Press [Default Setup], then configure the scope as follows:
a Pull down the Setup menu and select Acquisition.
22
channel inputs, you must ensure that the input voltage to the oscilloscope never
Ω
±(1.25% of channel offset + 1% of full scale + 1 mV)
Critical Specifications
DC voltage measurement accuracy better than ±0.1% of reading Keysight 34401A or
50Ω characteristic impedance, BNC (m) connectors
100V
BNC Tee (m)(f)(f)
2 BNC (f) to dual banana
Recommended
Model/
Part Numbers
Keysight 3458A
Keysight 8120-1840
Keysight 6614C
Keysight 1250-0781
Keysight 1251-2277