Offset Accuracy Verification; Table 1-3 Test Record For Impedance Verification - Keysight 8990B Service Manual

1 Performance Verification and Adjustments
Table 1-3 Test record for impedance verification (continued)
Input impedance Vertical scale
50 Ω 0.05 V/div
50 Ω 0.1 V/div
50 Ω 0.2 V/div
50 Ω 0.5 V/div
50 Ω 1 V/div
1 MΩ 0.01 V/div
1 MΩ 0.02 V/div
1 MΩ 0.05 V/div
1 MΩ 0.1 V/div
1 MΩ 0.2 V/div
1 MΩ 0.5 V/div
1 MΩ 1 V/div
1 MΩ 2 V/div
1 MΩ 5 V/div

Offset accuracy verification

The offset accuracy specification consists of the offset gain and zero error. The
offset gain characteristic is ±1.25% of the channel offset and the zero error
characteristic is ±1% of the full scale. The offset accuracy verification procedure
tests the zero error and offset accuracy.
Required test equipment:
– 1 unit 34410A/3458A digital multimeter
– 2 units of 10503A BNC cable
– 1 unit of 6614C DC power supply
– 1 unit of BNC tee adapter (1250-0781)
– 2 units of BNC to dual banana adapter (1251-2277)
38
Video input Video input
channel 2 channel 3
Limits
48.75 Ω to 51.25 Ω
48.75 Ω to 51.25 Ω
48.75 Ω to 51.25 Ω
48.75 Ω to 51.25 Ω
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
990 kΩ to 1.010 MΩ
Keysight 8990B Service Guide